HMP240 SERIES TRANSMITTERS User's Guide M210300en-A June 2002
Vaisala Oyj 2002 No part of this document may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without a prior written notice of the copyright holder. The instruction manuals may be changed without prior notice.
HMP240 series User's guide M210300en Contents 1. PRODUCT DESCRIPTION ..........................................................................................5 2. ADVANTAGES OF A WARMED SENSOR HEAD ........................................................7 3. INSTALLATION ..........................................................................................................8 4. 5. 3.1 Selecting the place of installation.................................................................8 3.
HMP240 series User's guide 5.4.2 5.4.2.1 5.4.2.2 5.4.2.3 5.4.2.4 5.4.2.5 5.4.2.6 5.4.2.7 5.4.2.8 5.4.2.9 5.4.2.10 5.4.3 5.4.3.1 5.4.3.2 6. 7. ii M210300en Output via the serial bus ................................................................. 36 Starting the measurement output.................................................... 36 Stopping the measurement output .................................................. 36 Outputting the reading once.........................................................
HMP240 series User's guide M210300en 7.5.2 8. With LED commands ...................................................................... 60 7.6 Measurement of output currents using test points.................................... 60 7.7 Adjusting the contrast of the display.......................................................... 61 TECHNICAL DATA ................................................................................................... 62 8.1 Dewpoint temperature ..........................
HMP240 series User's guide This page intentionally left blank.
HMP240 series User's Guide M210300en 1. PRODUCT DESCRIPTION The HMP240 transmitter is a microprocessor based instrument for the measurement of dewpoint temperature especially in high humidities and/or fast changing temperatures. The dewpoint temperature is measured through relative humidity and temperature. The dewpoint temperature, although a calculated variable, is the primary reading obtained with the HMP240.
HMP240 User's Guide M210300en Options Additional T probe Calculation variables Serial interface Display cover Filters Cable lengths Installation aids HMP243MIK 6 For the measurement of the ambient temperature and for obtaining other quantities in addition to dewpoint temperature and mixing ratio dewpoint difference, mixing ratio, absolute humidity, wet bulb temperature RS 232C (standard), RS 485/422, digital current loop module cover with local display & keypad sintered filter, PPS grid with steel nett
HMP240 series User's Guide M210300en 2. ADVANTAGES OF A WARMED SENSOR HEAD In some measurement applications, unwanted dew formation makes humidity measurement difficult or even impossible. At a weather station, for example, high humidity combined with rapidly changing outdoor temperature can condense the water vapour in the air onto the sensor head. Until this dew evaporates or dries, it is impossible to obtain a true reading.
HMP240 User's Guide 3. INSTALLATION 3.1 Selecting the place of installation M210300en The transmitter should be installed in a place that gives a true picture of the environment or process and is as clean as possible. Air should circulate freely around the sensor. If necessary, the transmitter can be installed in a place where a hot spot may develop. However, cold spots should be avoided.
HMP240 series User's Guide M210300en 3.2 Mounting 3.2.1 Mounting the HMP243 133 humidity sensor head T-sensor head (optional) 104 ø6.5 Cable length 2000, 5000 or 10000 mm Figure 3.1 Sliding PTFE-sleeve for flange installation and cable-gland installation HMP243 transmitter with a humidity sensor head and an additional T sensor head When mounted on the side of a duct or channel, the sensor head must be inserted from the side (see Figure 3.2).
HMP240-series User's Guide M210300en duct wall flange sealing (silicone) humidity sensor head a plugged hole for reference measurements supporting bar T-sensor head (optional) PTFE sleeve Figure 3.2 Installing the sensor heads of the HMP243 in a channel with the help of flanges and supporting bars The sensor head can also be installed vertically.
HMP240 series User's Guide M210300en 3.2.2 Mounting the HMP247 HMP247 has a small size probe made of stainless steel. The sensor head withstands temperatures -40...180 ºC (-40...356 ºF) and pressure up to 10 bar (1MPa, 145 psi). The probe is suitable for applications where a mechanically very durable leak proof probe is needed. Pressure tight installations A pressure tight installation can be done by using a probe head installation or cable installation.
HMP240 User's Guide M210300en Pressure tight installation with Vaisala's supportive thread bar set HMP247TBS (cable gland HMP247CG included) 1. Make a hole with M20x1.5 to a wall or weld a pipe fitting (∅30/M20x1.5x12mm) to a wall. 2. Install the cable gland's fitting body on the hole in the wall. 3. Thread the sensor head through the nut and press the cable through the cutting line of the sealing. 4. Turn the supporting bars into the sensor head's threaded holes. 5.
HMP240 series User's Guide M210300en 3.3 Grounding A single electrical cable with a screen and three to ten wires is recommended for power and analogue output/serial bus connections. The cable diameter should be 7...10 mm. The screen of the electrical cable must be grounded properly to achieve best possible EMC performance. Recommended cable shield is done in the cable gland as shown below.
HMP240 User's Guide M210300en • tighten the nut • connect the wires into the screw terminals and fasten a cable tie around the wires cable tie transmitter housing gland brass disks rubber ring nut NOTE When the cable is grounded as explained on the previous page, the metallic parts of the sensor head, the shield of its cable, the transmitter housing and the shield of the signal cable to external system are all connected to each other. After this the whole system can be grounded from one point only.
HMP240 series User's Guide M210300en Electrical connections CH1+ CH1CH2+ CH2- CH1- and CH2- are connected together internally + + V mA V mA - CURRENT/VOLTAGE OUTPUTS - POWER SUPPLY 24 V + 3.4 Do not use power supply ground (-) as output signal ground X2 X1 OPENED COVER OF THE HMP 243 Figure 3.6 Electrical connections Power supply 24 VDC 24 VAC (see Chapter 3.4.1) Output signals 0...20 mA 4...20 mA 0...1 V 0...5 V 0...
HMP240 User's Guide M210300en 3.4.1 Connection to a 24 VAC supply The HMP240 transmitter can also be connected to a 24 VAC supply without an external rectifier. However, when more than one transmitter is connected to one 24 VAC transformer, a common loop is formed and there is an increased risk of a short-circuit. To avoid this, always use separate floating supply for each transmitter (see Figure 3.7 A).
HMP240 series User's Guide M210300en 4. COMMISSIONING When the HMP240 transmitter leaves the factory, its measurement ranges and output signals have already been scaled according to the order form completed by the customer. The unit is calibrated at the factory and ready to operate when the power is turned on. If you take into use active current, voltage or serial bus outputs, make these connections first; appendix 6 describes them in detail.
HMP240 User's Guide M210300en X15 CHANGE OF SETTINGS DISABLED OPENED COVER OF THE HMP 243 Figure 4.1 Location of the security lock jumper When the security lock jumper is connected, some commands are not available (see Chapter 5). Should the application require variables that are not included in the configuration of the transmitter, the user is invited to contact Vaisala or a Vaisala representative. 4.
HMP240 series User's Guide CH1 CH2 M210300en CH1 CH2 CH1 CH2 CURRENT OUTPUTS 0 ... 20 / 4 ... 20 mA CH1 CH2 CH1 CH2 VOLTAGE OUTPUTS 0 ... 5 V / 0 ... 10 V CH1 CH2 CH1 CH2 VOLTAGE OUTPUTS 0 ... 1 V CH1 CH2 CH1 0 ... 1 VOLTAGE OUTPUT CH2 CURRENT OUTPUT X15 OPENED COVER OF THE HMP 243 Figure 4.2 Selecting the analogue outputs with jumpers The software has to be informed which outputs are in use. This is done either through the serial interface or the menus on a local display.
HMP240 User's Guide M210300en X55 spare jumpers OPENED COVER OF THE HMP 243 Figure 4.3 4.4 Spare jumpers Connecting the RS 232C serial bus RX GND TX NC X6 OPENED COVER OF THE HMP 243 Figure 4.4 Serial bus connections To connect a PC to the HMP240 transmitter via the RS 232C serial bus, one of the following cables is required. The type of the cable depends on the terminal and the connector type.
HMP240 series User's Guide M210300en D9S PC 2 5 3 4 6 7 8 3 7 2 D25S 5 6 8 20 TERMINAL 3 D25P 7 2 TXD RXD TXD RXD TXD RXD TX GND RX TX GND RX HMP 243 TX GND RX Figure 4.5 Connection of cables When the serial bus has been connected between the PC and the transmitter, the PC is switched on. When using a PC, a terminal emulation programme (e.g. Procomm Plus, Datastorm or Windows terminal) is started.
HMP240 User's Guide M210300en In calibrating or changing the settings of the transmitter it can be more convenient to use the connector X17, if connector X6 is already in use. This connector, however, transfers only RS 232C signals. If an RS 485/422 serial port module or a current loop module has been installed, it has to be removed before communicating through the X17 connector. RX GND TX X17 Figure 4.
HMP240 series User's Guide M210300en When the jumper is inserted the serial line factory settings become valid, but only temporarily. The transmitter must be given new settings; otherwise the transmitter uses the old, unknown settings after power-up. When the new settings have been given, the transmitter must be reset. The jumper must be removed before the transmitter is reset; if the jumper is in place when power is turned on, the transmitter does not work.
HMP240 User's Guide 5. M210300en COMMANDS As the HMP240 transmitter is a microprocessor based device, its configuration can be set to correspond to the specific needs of the user. This is done through commands, either by utilizing the menus on the local display or by giving commands through the serial interface (see Appendix 1). Most often the commands are used to change the settings of the two analogue channels.
HMP240 series User's Guide M210300en 5.2 LED commands NOTE If the transmitter has a display/keypad cover, the LED commands cannot be used. LED commands can be used to operate the transmitter in the field. These commands can be used in humidity and temperature calibration and calibration of the analogue outputs. Open the housing and press any one of the three press switches. The LEDs will light up for 2 - 3 seconds. UP DOWN LEDs press switches ENT OPENED COVER OF THE HMP 243 Figure 5.
HMP240 User's Guide 5.3 M210300en Display/keypad commands 5.3.1 Display mode In the display mode the transmitter outputs measurements on the display; different quantities can be scrolled with arrow keys. The first line is scrolled with button σ and the second line with button τ; all selections are stored with ENTER. The selected quantities appear on the display also after power failure. After reset the transmitter is always in the display mode.
HMP240 series User's Guide M210300en 5.3.4 Analogue output commands 5.3.4.1 Selecting the output (mA/V) Disconnect the security lock jumper! • Select Mode in the main menu and Analog outputs in the Mode menu: • Select Mode ( mA / V ). The current settings for channel 1 are displayed: • If the settings are correct, press ENT.
HMP240 User's Guide M210300en 5.3.4.2 Selecting and scaling the analogue output quantities Disconnect the security lock jumper! • Select Mode in the main menu and Analog outputs in the Mode menu: • Select Scale. The quantity and scaling for channel 1 are displayed: • If the settings are correct, press ENT.
HMP240 series User's Guide M210300en 5.3.5 Output via the serial bus 5.3.5.1 Turning the serial interface echo ON/OFF • Select More in the main menu, select More in the More menu and select Echo in the second More menu. • Use the arrow keys to select the right alternative and press ENT. 5.3.5.2 Serial bus settings • Select Seri in the main menu; the currently valid serial interface settings are displayed: • If the settings are correct, press ENT; the programme returns to the display mode.
HMP240 User's Guide M210300en Selecting stop bits: Full duplex/half duplex: The processor does not allow the following combinations: • no parity, 7 data bits, 1 stop bit: if this combination is given the HMP240 programme will change the number of stop bits to 2 • even or odd parity, 8 data bits, 2 stop bits: if this combination is given the programme changes the number of stop bits to 1 NOTE The serial bus settings become effective only after reset. 5.3.5.
HMP240 series User's Guide M210300en 5.3.5.4 Selecting the output units • Select Unit in the main menu: • Use the arrow keys to select the right alternative and press ENT. RH T Td dT a x Tw 5.3.5.
HMP240 User's Guide M210300en When the connection to a given transmitter is opened in the POLL mode, the transmitter goes into STOP mode and can then receive commands normally. Closing the connection returns the transmitter to POLL mode. In POLL mode, the transmitter outputs measurement only when requested (command SEND aa). If the user has forgotten the address of the transmitter and the transmitter does not have a display, the transmitter has to be reverted to the factory settings (see Chapter 4.4.1).
HMP240 series User's Guide M210300en 5.3.7 Others 5.3.7.1 Setting the averaging time Disconnect the security lock jumper! With command FILT the transmitter can be given the averaging time during which the individual measurement samples are integrated to get an averaged reading. The time can be set in seconds within the range of 0 - 1024 (0 = no averaging time).
HMP240 User's Guide M210300en 5.3.7.3 Setting the date • Select More in the main menu; select Date in the More menu: • If the date is correct, acknowledge it by pressing ENT; this takes the programme back to the More menu. • If the date needs to be changed, press CL.
HMP240 series User's Guide M210300en 5.3.7.5 Heat on / heat off command The status of this command should always be HEAT ON, and it should not be altered. It is meant for service purposes only. 5.4 Serial commands All available serial commands are described in more detail in Appendix 1. The following chapters include only the most commonly used command sequences. See Chapter 4.4 for connecting the HMP240 transmitter to a serial bus. Pressing ESC always interrupts any serial command being given.
HMP240 User's Guide M210300en 5.4.1.2 Selecting and scaling the analogue output quantities Disconnect the security lock jumper! ASEL xxx yyy xxx yyy = = channel 1's quantity channel 2's quantity (RH, T, Td, dT, Abs, Mix or Tw) Example: RH selected on channel 1 and temperature on channel 2 >ASEL RH T Ch1 (RH) lo Ch1 (RH) hi Ch2 (T ) lo Ch2 (T ) hi 5.4.1.3 0.000 %RH? 100.000 %RH ? -40.000 'C ? +160.
HMP240 series User's Guide M210300en 5.4.2.3 Outputting the reading once SEND in STOP mode or SEND aa aa = in POLL mode address of the transmitter when more than one transmitter is connected to a serial bus (0...99) The output format depends on which parameters the transmitter can output. Output types: "Td=999.9 'C", "RH=999.9 %RH T=999.9 'C Td=9999.9 'C", "Td=999.9 x=999.9 g/kg", "RH=999.9 %RH T=999.9 'C Td=9999.9 'C a=9999.9 g/m3 x=9999.9 g/kg Tw=999.
HMP240 User's Guide M210300en >SERI O 4800 O 7 1 HDX changing parity only >SERI 600 N 8 1 F 600 N 8 1 FDX changing all parameters The processor does not allow the following combinations: • no parity, 7 data bits, 1 stop bit: if this combination is given the HMP240 programme will change the number of stop bits to 2 • even or odd parity, 8 data bits, 2 stop bits: if this combination is given the programme changes the number of stop bits to 1 NOTE The serial bus settings become effective on
HMP240 series User's Guide M210300en The time can be set in seconds within the range of 0 - 1024 (0 = no averaging time). For example: >FILT Filter (S): > 0 ? 1024 >FILT 100 Filter (S): 100 > 5.4.2.8 Setting the transmitter address ADDR aa aa = address (0...99) Example: transmitter is given address 99 >ADDR Address 5.4.2.
HMP240 User's Guide M210300en 5.4.3 Operating the transmitter via the serial bus 5.4.3.1 Setting the serial interface SMODE xxxx xxxx = STOP, RUN or POLL In STOP mode: measurements output only by command, all commands can be used In RUN mode: outputting automatically, only command S can be used In POLL mode: measurements output only with command SEND.
HMP240 series User's Guide M210300en 5.4.3.2 OPEN & CLOSE OPEN nn nn = address of the transmitter (0...99) CLOSE In STOP mode: command OPEN has no effect, CLOSE sets the transmitter in POLL mode In POLL mode: command OPEN sets the transmitter temporarily in STOP mode, command CLOSE returns the instrument to POLL mode Example: relative humidity calibration is performed at transmitter 2 which is in POLL mode >OPEN 2 >CRH ...
HMP240 User's Guide 6. M210300en CALIBRATION The HMP240 transmitter has been fully calibrated at the factory so there should be no immediate need for recalibration. The transmitter should be calibrated only if there is reason to believe that the adjustments of the transmitter have changed. The adjustments of the temperature measurement channel and the analogue outputs are particularly stable; in normal circumstances there is no need to recalibrate them.
HMP240 series User's Guide M210300en A ∅ 13.5 mm adapter must be used when calibrating with the HMK13B calibrator. The adapter (part no. 16611) can be ordered from Vaisala or Vaisala representatives. Calibration can be performed by giving the commands with the press switches inside the housing (see Chapter 5.2), through the serial bus (see Chapter 5.4) or through the menus on the local display (see Chapter 5.3).
HMP240 User's Guide M210300en 6.1.1.1 • With serial commands Make sure that the sensors of the transmitter and the reference instrument are close to each other. Allow enough time for the sensor heads to stabilize to the measurement conditions Disconnect the security lock jumper! • Give command CRH , enter the humidity value and press . >CRH RH : xx.x Ref1 ? yy.y Press any key when ready...
HMP240 series User's Guide M210300en 6.1.1.3 With LED commands • Make sure that the sensors of the transmitter and the reference instrument are close to each other. Allow enough time for the sensor heads to stabilize to the measurement conditions Disconnect the security lock jumper! • Connect an ammeter/voltmeter to the analogue outputs (connector X2); if the outputs are already connected e.g.
HMP240 User's Guide M210300en • Insert the sensor head into the measurement hole of the LiCl chamber. • Wait at least 10 minutes for the reading to stabilize. • Give command CRH , enter the first point value and press . >CRH RH : xx.x Ref1 ? yy.y Press any key when ready... • If you want to see how the sensor stabilizes to the humidity in the calibrator, enter c : RH : 11.9 Ref1 ? RH : 11.5 Ref1 ? RH : 11.
HMP240 series User's Guide M210300en • Insert the sensor head into the measurement hole of the NaCl chamber. • Wait at least 20 minutes for the reading to stabilize. • If necessary, change the second point reading with arrow keys and press ENT. 6.1.2.3 With LED commands • Leave the calibrator and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap on the transmitter.
HMP240 User's Guide M210300en 6.1.3 Humidity calibration procedure after sensor change Humidity calibration should be performed in stable conditions using saturated salt solutions as a reference. If the transmitter has the re-gaining option, the re-gaining has to be done manually before starting the calibration. 6.1.3.1 With serial commands • Leave the calibrator and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize.
HMP240 series User's Guide M210300en • Insert the sensor head into the measurement hole of the LiCl chamber. • Wait at least 20 minutes for the reading to stabilize. • Select Cali in the main menu and then RH cal; select Sensor changed. Change the first point reading with the arrow keys and press ENT. • Insert the sensor head into the measurement hole of the NaCl chamber. • Wait at least 20 minutes for the reading to stabilize.
HMP240 User's Guide M210300en The basic capacitance of the new sensor may differ considerably from that of the previous one. Therefore the corresponding humidity reading of the transmitter may be below 0 %RH at the low or above 100 %RH at the high calibration point. However, the current/voltage reading of the analogue output shows only the minimum or maximum value of the selected current/voltage scale and the output value may not change even though the arrow switches are pressed several times.
HMP240 series User's Guide M210300en 6.2.1 One point offset calibration 6.2.1.1 With serial commands • Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. Disconnect the security lock jumper! • Check the transmitter against the reference. • After giving the correct temperature value (Ref1) and pressing , press any key and then . 6.2.1.
HMP240 User's Guide M210300en 6.2.2 Two point temperature calibration 6.2.2.1 With serial commands • Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. Disconnect the security lock jumper! • Check the transmitter against the reference. • For the humidity sensor head: give command CT , enter the first point value and press : >CT T : xx.x Ref1 ? yy.
HMP240 series User's Guide M210300en 6.2.2.2 • With display / keypad commands Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap prior to calibration. Disconnect the security lock jumper! • Check the transmitter against the reference. • Select Cali in the main menu and then T (Ta for the additional T sensor head); select two-point calibration T (or Ta) 2 point cal.
HMP240 User's Guide 6.3 M210300en Calibration of analogue outputs The analogue outputs have been calibrated at the factory and since they are very stable, calibration should be performed only when there is reason to believe that their adjustments have changed. 6.3.1 With serial commands Disconnect the security lock jumper! ACAL The outputs on channels 1 and 2 are measured and the measured values (mA or V) entered as calibration coefficients. Example: both channels have 0...
HMP240 series User's Guide M210300en • Enter the measured upper end current/voltage on channel 2. 6.3.3 With LED commands If both the analogue outputs and humidity/temperature channels are calibrated, the analogue outputs should be calibrated first. This applies only when the calibrations are done with LED commands! • connect an ammeter/voltmeter to the analogue outputs (connector X2) Disconnect the security lock jumper! • Give command ¡¡ll.
HMP240 User's Guide M210300en 7. MAINTENANCE 7.1 Reference measurements Reference measurements are necessary for the verification of whether the transmitter readings are within specifications. This way the user can check if the transmitter needs calibration or service. If the transmitter can be taken out of the process or the control system, perform the reference measurement in a laboratory with stable conditions.
HMP240 series User's Guide M210300en > When errors have occurred, the transmitter outputs an error code (see Appendix 4 for all error messages): >ERRS E40 f ( all ) > 7.3 out of range Replacing the composite sensor The humidity and temperature sensors (HUMICAP H-sensor and Pt100) have been glued together. If one or both sensors are damaged, the whole composite sensor must be changed. • Cut the pins of the Pt100 sensor at the top. • Lift the humidity sensor gently.
HMP240 User's Guide M210300en X88 X77 TP2 TP3 TP1 Figure 7.1 Location of solder lugs TP1, TP2 and TP3 and connector X77 Connect a Pt 100 simulator to connector X77 and set it at the lowest temperature to be calibrated. Pt 100 X77 Figure 7.2 Connecting the Pt 100 simulator to connector X77 Switch the power on. 7.4.1 With serial commands Give command CTA, enter the first point value and press : >CTA Ta : xx.x Ref1 ? yy.
HMP240 series User's Guide M210300en Disconnect the Pt 100 simulator and reconnect the Pt 100 wires to solder lugs TP1, TP2 and TP3. The correct connections according to wire colours are: TP1 blue TP2 white TP3 red If a Pt 100 simulator is not available, the adjustment can be made with two resistors of 84 Ω and 154 Ω with precisely known resistance. Measure resistors with a resistance meter.
HMP240 User's Guide M210300en Pt 100 X88 Figure 7.4 Connecting the Pt 100 simulator to connector X88 Switch the power on. 7.5.1.1 With serial commands Give command CT, enter the first point value and press : >CT C : xx.x Ref1 ? yy.y Press any key when ready Set the Pt 100 simulator at the highest temperature to be calibrated and press any key. Enter the second point (gain) reference reading. 7.5.1.
HMP240 series User's Guide M210300en CH2- CH2+ CH1- CH1+ the external load. The output current can, however, be measured at test points CH1+/CH1- and CH2+/CH2- without disconnecting the output wires. These test points can therefore be used in one point offset correction against an accurate reference or in checking the current output without disconnecting the analogue output from the process. X15 X2 CH1 + + CH2 OPENED COVER OF THE HMP 243 Figure 7.
HMP240 User's Guide 8. M210300en TECHNICAL DATA Sensor RH & T composite sensor HUMICAP®KC(part no. 18258HM) T sensor in the humidity sensor head Pt 100 IEC 751 class 1/3 B Voltage proof, AC: DC supply (+ or -) to housing 250 VAC, 1 minute (300 kΩ and 15 nF parallel) 8.1 Dewpoint temperature typical range of dewpoint temperature -40...
HMP240 series User's Guide M210300en 8.2 Temperature (with additional T sensor head) Measurement range -40...+180 °C Typical accuracy at +20 °C (+68 °F) ±0.1 °C Typical temperature dependence of electronics 0.005 °C/°C Temperature sensor 8.3 Pt 100 RTD DIN IEC 751, class 1/4 B Calculated variables Without the additional temperature head only dewpoint temperature and mixing ratio are available.
HMP240 User's Guide M210300en 8.3.2 Accuracy of other calculated variables Accuracy of mixing ratio (g/kg) when ambient pressure is 1013 mbar Temp. -40 -20 0 20 40 60 80 100 120 140 160 Relative 10 0.001 0.007 0.033 0.12 0.37 1.03 2.60 6.24 15.45 44.97 228.7 humidity 20 0.002 0.010 0.043 0.15 0.49 1.41 3.79 10.49 36.25 326.3 - 30 0.002 0.012 0.053 0.19 0.61 1.82 5.23 17.10 100.4 - 40 0.002 0.014 0.063 0.23 0.74 2.26 6.99 27.98 464.4 - 50 0.003 0.017 0.074 0.26 0.87 2.73 9.16 47.20 - 60 0.003 0.
HMP240 series User's Guide M210300en 8.4 Outputs Two analogue outputs selectable 8.5 0...20 mA 0...1 V 0...10 V 4...20 mA 0...5 V Typical accuracy of an analogue output at +20 °C ±0.05 % full scale Typical temperature dependence of an analogue output 0.005 %/°C full scale Serial output available RS 232C Electronics User interface 3 keys and 4 LEDs inside the housing or local display keypad Display 2 x 16 character alphanumeric high-contrast, wide view angle LCD 3.85 mm (0.
HMP240 User's Guide 8.6 M210300en Operating temperature (electronics) with display cover -40...+60 °C 0...+50 °C Storage temperature -40...+70 °C Mechanics Housing material G-AlSi12 (DIN 1725) Housing classification IP 65 (NEMA 4) Bushing for 7...10 mm diameter cable (8 x 0.5 mm2 shielded cable) Sensor protection stainless steel sintered filter (part no. 16452) PPS grid with stainless steel netting (part no. 16720) Housing dimensions 145 x 120 x 65 mm Sensor head dimensions: . . ∅13.
HMP240 series User's Guide M210300en Figure 8.4 HMP247 sensor head information Weight with HMP240 (duct mounting, max 180°C, without T probe) T probe for HMP240 HMP243FA (duct installation kit for HMP240; 180°C) 2 x HMP243FA 5 m cable 1300 g 10 m cable 1500 g 80 g 140 g 150 g 250 g 280 g Weight of display cover 8.
HMP240 User's Guide 9.
HMP240 Appendix 1: Serial commands M210300en APPENDIX 1: SERIAL COMMANDS 1. ANALOGUE OUTPUT COMMANDS ......................................................................... 70 2. CALIBRATION COMMANDS .................................................................................... 73 3. OUTPUT VIA THE SERIAL BUS ............................................................................... 77 3.1 4. Operation modes...............................................................................
HMP240 Appendix 1: Serial commands 1. M210300en ANALOGUE OUTPUT COMMANDS AMODE Setting the analogue outputs Disconnect the security lock jumper! AMODE a bb.bbb cc.ccc d ee.eee ff.fff a = bb.bbb = cc.ccc = d = ee.eee = ff.fff = channel 1: U = voltage output I = current output lower limit of channel 1 upper limit of channel 1 channel 2: U = voltage output I = current output lower limit of channel 2 upper limit of channel 2 The bb.bbb, cc.ccc, ee.eee and ff.
HMP240 Appendix 1: Serial commands M210300en For example, relative humidity is selected to be output on channel 1 and temperature on channel 2; the temperature range is scaled to 0...100 °C: >ASEL RH T Ch1 (RH) lo Ch1 (RH) hi Ch2 (T ) lo Ch2 (T ) hi 0.000 %RH 100.000 %RH -40.000 'C +160.000 'C ? ? ? 0 ? 100 When the ASEL command is given on its own, the transmitter outputs its current settings: >ASEL Ch1 (RH) Ch1 (RH) Ch2 (T ) Ch2 (T ) lo hi lo hi 0.000 %RH 100.
HMP240 Appendix 1: Serial commands M210300en The output scales can also be given directly with the ASCL command. ASCL aaa.a bbb.b ccc.c ddd.d aaa.a bbb.b ccc.c ddd.d = = = = lower limit of channel 1 upper limit of channel 1 lower limit of channel 2 upper limit of channel 2 For example, when relative humidity is scaled to 0...100 %RH on channel 1 and temperature to -40...+100 °C on channel 2: >ASCL 0 100 Ch1 (RH) lo Ch1 (RH) hi Ch2 (T ) Ch2 (T ) 72 -40 100 0.000 %RH 100.000 %RH lo -40.
HMP240 Appendix 1: Serial commands M210300en 2. CALIBRATION COMMANDS CRH Relative humidity calibration Disconnect the security lock jumper! CRH With this command the transmitter can be calibrated against a reference. A one-point calibration can be done against an accurate transfer standard in the field and a two-point calibration using saturated salt solutions in controlled conditions. A two-point calibration is performed as follows: >CRH RH : 12.00 Ref1 ? 11.3 Press any key when ready .
HMP240 Appendix 1: Serial commands M210300en The command can also be divided into two commands, so the computer can be used for other purposes while waiting for the sensor to stabilize to the higher humidity. >FCRH 1 RH : 1.90 Ref1 ? FCRH 2 ... RH : 76.30 Ref2 ? 11.3 74.9 If the stabilization of the sensor to the humidity in the calibrator needs to be monitored, the measurement output can be repeated by giving command c at Ref1 and Ref2: >FCRH RH : 12.00 Ref1 RH : 11.
HMP240 Appendix 1: Serial commands M210300en CTA Temperature calibration of the optional T sensor head Disconnect the security lock jumper! CTA With this command the optional temperature sensor head can be calibrated against an accurate reference, such as a Pt 100 simulator. A two-point calibration is performed as follows: >CTA Ta : 0.80 Ref1 ? 0.0 Press any key when ready ... Ta : 56.20 Ref2 ? 55.
HMP240 Appendix 1: Serial commands L M210300en Outputting linear correction coefficients L With the help of command L the user can check how the transmitter has been adjusted after it has been calibrated at the factory. >L RH offset RH gain Ts offset Ts gain Ta offset Ta gain : : : : : : 0.000 1.000 0.000 1.000 0.000 1.
HMP240 Appendix 1: Serial commands M210300en 3. OUTPUT VIA THE SERIAL BUS R Starting the measurement output R Starts output of measurements to the peripheral devices (PC display or printer); output interval is set with command INTV. The output format depends on the transmitter configuration and variables used. The sequence, however, is always the same: relative humidity, temperature, dewpoint temperature, absolute humidity, mixing ratio, wet bulb temperature and dewpoint difference.
HMP240 Appendix 1: Serial commands DSEND M210300en Outputting readings of all connected transmitters once DSEND All transmitters connected to the serial bus send their addresses and current measurement readings in a sequence defined by their addresses. After receiving DSEND command a transmitter sets a delay time according to its address value and sends the data after this delay. DSEND works also in POLL mode.
HMP240 Appendix 1: Serial commands M210300en ECHO Turning the serial interface echo ON/OFF ECHO xxx xxx = ON or OFF When the echo is off, the commands given through the serial interface or the prompt > cannot be seen on the display. When the serial interface is in half-duplex mode, the echo is always off. Even then the ECHO command can indicate that echo is on. INTV Setting the output interval for the RUN mode INTV xxx yyy xxx = yyy = output interval (0...
HMP240 Appendix 1: Serial commands FORM M210300en Setting the output format FORM "xxx...xxx" ? zzz...zzz xxx...xxx zzz...zzz = = old format new format The FORM command sets the format of the outputs generated in RUN state and by SEND command. Please note that capital and small letters have different meanings. \UU..UU\ \TT..TT\ \DD..DD\ \AA..AA\ \XX..XX\ \WW..WW\ \dd..d\ \uu..
HMP240 Appendix 1: Serial commands M210300en ?\UUU.U\\t\TTT.T\\t\DDD.D\\t\AAA.A\\t\XXX.X\\t\WWW.W\\ r\n The output is then: 47.4 22.4 10.6 9.4 8.0 15.4 FTIME Adding time to output FTIME xxx xxx = ON or OFF When FTIME is activated, the current time is output at the beginning of the output line. The time is set with command TIME. After RESET or power on the current time is 00:00:00. Activating the time output >ftime on Form.
HMP240 Appendix 1: Serial commands M210300en Activating the date output >fdate on Form. date >r 1995-03-10 1995-03-10 1995-03-10 1995-03-10 1995-03-10 ... : RH= RH= RH= RH= RH= ON 21.1 21.3 23.1 22.2 20.6 %RH %RH %RH %RH %RH T= T= T= T= T= 26.0 26.0 26.0 26.0 26.0 'C 'C 'C 'C 'C Inactivating the date output >fdate off Form. date >r RH= 20.2 %RH RH= 19.9 %RH RH= 19.8 %RH RH= 19.7 %RH RH= 19.7 %RH ... SERI : OFF T= T= T= T= T= 26.0 26.0 26.0 26.0 26.
HMP240 Appendix 1: Serial commands M210300en The processor does not allow the following combinations: • no parity, 7 data bits, 1 stop bit: if this combination is given the HMP240 programme will change the number of stop bits to 2 • even or odd parity, 8 data bits, 2 stop bits: if this combination is given the programme changes the number of stop bits to 1 When the half-duplex mode is set, it will automatically turn the echo off. Even then the ECHO command can indicate that echo is on.
HMP240 Appendix 1: Serial commands M210300en When asking the current address, no address number is given: >ADDR Address : FROST 2 ? Setting the calculation mode Disconnect the security lock jumper! FROST ON/OFF This command is used to select whether the transmitter calculates the frostpoint (default) or the dewpoint reading at dewpoint temperatures below 0 °C. Select FROST ON for frostpoint and FROST OFF for dewpoint calculations.
HMP240 Appendix 1: Serial commands M210300en SMODE xxxx aa xxxx = = address of the transmitter STOP, RUN or POLL The OPEN command sets the bus temporarily in STOP MODE so that the SMODE command can be given. For example: >SMODE Serial >SMODE Serial mode : STOP STOP mode : STOP which mode is in use at the moment setting STOP mode OPEN & CLOSE OPEN nn nn = address of the transmitter (0...
HMP240 Appendix 1: Serial commands 4. M210300en OTHERS ITEST Testing the analogue outputs ITEST or ITEST a b a b = = current/voltage of channel 1 current/voltage of channel 2 The operation of the analogue outputs can be tested by forcing the outputs to given values which can then be measured with a current/voltage meter from the analogue outputs. The response to ITEST command gives six outputs/parameters. Only the first two are relevant; they show the channel current or voltage in mA or V.
HMP240 Appendix 1: Serial commands M210300en The time can be set in seconds within the range of 0 - 1024 (0 = no averaging time). For example: >FILT Filter (S): > 0 ? 1024 >FILT 100 Filter (S): 100 > PRES Setting the pressure for mixing ratio and wet bulb temperature calculations PRES pppp.pp pppp.pp = pressure (hPa) The atmospheric pressure has an effect on mixing ratio and wet bulb temperature.
HMP240 Appendix 1: Serial commands M210300en XPRES Setting the pressure for mixing ratio and wet bulb temperature calculations temporarily XPRES pppp.pp pppp.pp = pressure (hPa) The function and format of XPRES are the same as those of the PRES command except that by using XPRES the setting is valid only until a reset is given or power is turned off or pressure is set to zero using XPRES. After this the pressure stored using command PRES is valid again.
HMP240 Appendix 1: Serial commands M210300en TIME For example, to enter a new time: >TIME Current time is 01:35:54 Enter new time (hh:mm:ss) : 13:25:56 When the current time is asked, the new time is passed with . VERS Name and version of the programme VERS For example: >VERS HMP 240 / x.yy where x.yy is the programme version. ? Outputting the transmitter settings ? For example: >? HMP 240 / 1.
HMP240 Appendix 1: Serial commands M210300en ?? Command ?? outputs the same information as command ? but it works also when the transmitter has been set to POLL mode. However, if there are more than one addressed transmitters connected to the serial bus, they all will respond at the same time and the output on the screen will be chaotic.
M210300en HMP240 Appendix 2: RS 485/422 serial port module APPENDIX 2: INSTALLING AND USING THE RS 485/422 SERIAL PORT MODULE 1. INSTALLATION ........................................................................................................ 92 2. OPERATION ............................................................................................................. 93 3. NETWORK CONFIGURATION.................................................................................. 95 4. 3.1.
HMP240 Appendix 2: RS 485/422 serial port module M210300en 1. INSTALLATION Switch the transmitter off. Resistors R2, R3 and R4 between connectors X4 and X5 in the component board in the cover of the transmitter are removed with side-cutting pliers. The module is plugged in connectors X4 and X5 on the main board of the HMP240 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5.
HMP240 Appendix 2: RS 485/422 serial port module M210300en 2. OPERATION The HMP240 transmitter can either be given an address or operated without an address. Both single and dual loop wiring with half duplex connection can be used. No address is needed when only one HMP240 transmitter is used; when several transmitters are connected to the same line, each transmitter must be given an address in the initial configuration.
HMP240 Appendix 2: RS 485/422 serial port module M210300en The RS 485/422 module has separate lines for transmitting and receiving, but they can be connected together with jumpers. Dual loop connection is the factory setting; when a single loop connection is used, the positions of jumpers in connector X4 on the module must be changed. The HI of the receiving line is approx. 0.6 V and its LO is approx. 0 V in order to reduce noise on the lines when no data is transferred (idling).
HMP240 Appendix 2: RS 485/422 serial port module M210300en 3. NETWORK CONFIGURATION 3.1 Single loop operation Bi-directional data on one pair is one of the great advantages of the RS 485 line. Set jumpers in connector X4 on the module board as shown in the figure below. X1 X2 X4 X4 This jumper setting connects RX HI to TX HI and RX LO to TX LO and selects only one common line termination. The HI and LO terminals of the RX pair can now be used for operation.
HMP240 Appendix 2: RS 485/422 serial port module • Set the address of the transmitter; you can choose any number between 1 and 99. In this example the address is 22: >addr 22 Address • M210300en : 22 Set the serial bus settings according to your network specifications. This setting will become valid after next RESET or power off: >seri 2400 e 7 1 h 2400 E 7 1 HDX • Set the transmitter in POLL mode: >smode poll Serial mode : POLL NOTE 1 The SMODE command must be given last.
HMP240 Appendix 2: RS 485/422 serial port module M210300en 3.2 Dual loop operation The following procedure must be repeated with all transmitters. • Open the transmitter cover. • Pull out the RS 485/422 serial port module, if it is already mounted. • Set the serial port of the terminal to 4800 baud, even parity, seven data bits and one stop bit, full duplex (4800 E 7 1 FDX). • The serial settings of the transmitter must also be 4800 E 7 1 FDX and the transmitter must be in STOP mode.
HMP240 Appendix 2: RS 485/422 serial port module M210300en NOTE 2 The transmitter outputs no prompt (>) after the SMODE POLL command and it only reacts to commands which include its address. • Check that the transmitter responds to its address: >send 22 RH= 24.4 %RH T= 29.1 'C • Disconnect the terminal. • Check that the jumpers in connector X4 are in the right place X1 X2 X4 X4 98 • Remount the RS 485/422 serial module. • Close the cover.
HMP240 Appendix 2: RS 485/422 serial port module M210300en 4. CHECKING THE SERIAL PORT NETWORK OPERATION Measurement readings are normally asked with the transmitter in POLL mode; the command must include the address of the transmitter. If the settings of the transmitter need to be changed, the transmitter is switched to STOP mode with command OPEN; commands can then be given without address. When the line to the transmitter is closed, it returns to POLL mode. 4.
HMP240 Appendix 2: RS 485/422 serial port module 4.2 M210300en POLL mode If a transmitter has been set to POLL mode, it will respond only to commands sent with its address: send 22 RH= 24.4 %RH T= 29.1 'C Addresses from 1 to 99 can be used. According to the RS 485/422 standard a maximum of 32 devices can be connected on same bus, but the number can be increased if the line length and/or baud rate is reduced. More than one baud rate can be used on an RS 485 line. E.g.
HMP240 Appendix 2: RS 485/422 serial port module M210300en 5. SPECIFICATIONS Connections on the main board Berg sockets screw terminals 0.5 mm² wires, stranded wires recommended Assembly plug-in module Board dimensions 40 x 28 mm Operating mode (single or dual pair wiring) half duplex Network: network type cable type line length max. number of devices data speed operating mode common mode voltage range daisy chain twisted pair 1000 m (3000 ft) 32 devices on line 9600 baud max.
HMP240 Appendix 3: Digital current loop module M210300en APPENDIX 3: INSTALLING AND USING THE DIGITAL CURRENT LOOP MODULE INSTALLATION Switch the transmitter off. Resistors R2, R3 and R4 between connectors X4 and X5 in the component board in the cover of the transmitter are removed with side-cutting pliers. The module is plugged in connectors X4 and X5 on the main board of the HMP240 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5.
HMP240 Appendix 3: Digital current loop module M210300en Unregulated AC/DC adapter can be used, if the current is limited to 20 mA at least by a serial resistor. Note.The host computer can restrict the loop supply voltage that can be used; see computer specifications. The serial line structure is a serial interfaced chain (daisy chain). At one end of the serial line there must be a HMP240 transmitter and at the other end a line master. A branch line can be made with a junction box.
HMP240 Appendix 3: Digital current loop module M210300en incorrectly, the voltage drop from RX+ to RX- or from TX+ to TX- is below 1 V and the transmitter does not work. Even then the current goes through the loop and the other transmitters can be operated normally. When the loop supply is current limited, the data lines can withstand short circuit to ground and to each other. They do not survive connection of supply voltage to the data lines.
HMP240 Appendix 3: Digital current loop module M210300en Single loop wiring • Set the address of the transmitter; you can choose any number between 1 and 99. In this example the address is 22: >addr 22 Address • : 22 Set the serial bus settings according to your network specifications. This setting will become valid after next RESET or power off: >seri 2400 e 7 1 h 2400 E 7 1 HDX • Set the transmitter in POLL mode: >smode poll Serial mode : POLL NOTE 1 The SMODE command must be given last.
HMP240 Appendix 3: Digital current loop module M210300en • Set the serial port of the terminal to 4800 baud, even parity, seven data bits and one stop bit, full duplex (4800 E 7 1 FDX). • The serial settings of the transmitter must also be 4800 E 7 1 FDX and the transmitter must be in STOP mode. If these factory settings have been changed, they must returned. Connect the RS 232C port of the terminal to connector X17 on the top of the main board and switch the power on.
HMP240 Appendix 3: Digital current loop module M210300en >send 22 RH= 24.4 %RH T= 29.1 'C • Disconnect the terminal. • Remount the digital current loop module. • Close the cover. • Repeat this setting procedure with each transmitter • When all transmitters on the network have been configured, switch them off. CHECKING THE SERIAL PORT NETWORK OPERATION Measurement readings are normally asked with the transmitter in POLL mode; the command must include the address of the transmitter.
HMP240 Appendix 3: Digital current loop module Ch2 ( T ) Transducer PRB serial nr Calibr. date M210300en hi 180.000 'C : : 0 : 0 When the necessary settings have been given, close the line to transmitters (the command closes all open lines): >close line closed CLOSE command is always given without address. If no line is open, there will be no response to the CLOSE commands. POLL mode If a transmitter has been set to POLL mode, it will respond only to commands sent with its address: send 22 RH= 24.
HMP240 Appendix 3: Digital current loop module M210300en Specifications Galvanic isolation 1500 VAC/DC max. (1 min) Loop supply voltage 40 V max. Loop supply current must be current limited 20 mA nominal Operating loop voltage requirement 4 V/each transmitter (TX+/TX-) on the loop 2 V/each receiver (RX+/RX-) on the loop Loop current 12...30 mA (space) 0...2 mA (mark) 30 mA max. Connections on the main board Berg sockets screw terminals 0.
HMP240 Appendix 6: HMP243 wiring diagram M210300en APPENDIX 4: ERROR MESSAGES 110 1.1 Errors after reset ....................................................................................... 112 1.2 Errors during operation.............................................................................
HMP240 Appendix 5: Calculation formulas M210300en 1. ERROR TYPES The HMP240 transmitter goes through a self-diagnostics procedure when the power is switched on. When the procedure does not reveal any errors or faults, the transmitter starts its normal operation. If errors or faults are found, the transmitter outputs an error message. Possible error message can also be checked with command ERRS (see Appendix 1).
HMP240 Appendix 6: HMP243 wiring diagram M210300en E21 PRB EEPROM ackn. error - no connection to the EEPROM including calibration information can be formed. Send the transmitter to Vaisala for repair. E22 PRB EEPROM checksum error ackn. error checksum error = = EEPROM is faulty check sum is erroneous - possibly due to an electrical disturbance an erroneous calibration parameter value or an incorrect checksum has been stored in the EEPROM including the calibration information.
M210300en HMP240 Appendix 5: Calculation formulas E41 f (T) out of range - the temperature measurement cannot be completed. Check the temperature sensor when only a humidity probe is used, and both temperature sensors if also an additional temperature probe is used. Check also the temperature measurement wires and their solderings on the component board (TP5,TP6,TP7 and TP8 for the humidity probe and TP1, TP3 and TP4 for the additional temperature probe).
HMP240 Appendix 6: HMP243 wiring diagram M210300en - the humidity measurement cannot be completed. Check the HUMICAP sensor and humidity measurement wires and their solderings on the component board (TP9,TP10 and TP11/15). If you cannot find any faults, send the transmitter to Vaisala for repair. E46 f (Ud2 ) out of range - the measurement hybrid is probably damaged. Send the transmitter to Vaisala for repair. E47 f (Uk1 ) out of range - the measurement hybrid is probably damaged.
HMP240 Appendix 5: Calculation formulas M210300en (TP5,TP6,TP7 and TP8 for the humidity probe and TP1, TP3 and TP4 for the additional temperature probe). If you cannot find any faults, send the transmitter to Vaisala for repair. E53 U1 y-value out of range - the humidity measurement cannot be completed. Check the HUMICAP sensor and humidity measurement wires and their solderings on the component board (TP9,TP10 and TP11/15). If you cannot find any faults, send the transmitter to Vaisala for repair.
HMP240 Appendix 6: HMP243 wiring diagram M210300en APPENDIX 5: CALCULATION FORMULAS The HMP240 transmitter measures relative humidity and temperature. From these values dewpoint, mixing ratio and absolute humidity are calculated using the following equations: Td = dewpoint: F H Tn m log Pws ⋅ RH 100 ⋅ A I K Pws 100 ⋅ p − RH ⋅ Pws mixing ratio: x = 621. 98 ⋅ RH ⋅ absolute humidity: a = 216 . 68 ⋅ RH ⋅ where dewpoint temperature (°C) Td = (1) −1 b g Pws 100 ⋅ t + 273.
HMP240 Appendix 5: Calculation formulas M210300en 3 ln Pws = ∑ bi Θ i + b4 ln Θ i = −1 where: bi = coefficients b-1 = -0.58002206 * 104 b0 = 0.13914993 * 101 b1 = -0.48640239 * 10-1 b2 = 0.41764768 * 10-4 b3 = -0.14452093 * 10-7 b4 = 6.5459673 The parameters A, m, and Tn depend on temperature according to the following table: t 0 ... 50 °C 50 ... 100 °C 100 ... 150 °C 150 ... 180 °C A 6.1078 5.9987 5.8493 6.2301 m 7.5000 7.3313 7.2756 7.3033 Tn 237.3 229.1 225.0 230.
HMP240 Appendix 6: HMP243 wiring diagram M210300en APPENDIX 6: HMP240 WIRING DIAGRAM Appendix 6: HMP243 wiring diagram Ltr Change Qty Reason/ Design ECO no Date Review Date Appr Note ! The cable shield has to be connected to the cable bushing for full EMC protection.
HMP243 Appendix 7: Re-gaining M210300en APPENDIX 7: RE-GAINING 1. GENERAL ............................................................................................................... 120 2. TO BE NOTED IN RE-GAINING.............................................................................. 121 3. LED COMMANDS ................................................................................................... 122 4. DISPLAY/KEYPAD COMMANDS .......................................................
HMP240 Appendix 7: Re-gaining 1. M210300en GENERAL In some specific applications the sensor gain may decrease gradually due to an interference caused by some particular chemical present in the ambient (see figure 1). The sensor polymer absorbs the interfering chemical; this reduces the polymer's ability to absorb water molecules and so decreases the sensor gain. In re-gaining the interfering chemical is evaporated by heating the humidity sensor.
HMP243 Appendix 7: Re-gaining M210300en 2. TO BE NOTED IN RE-GAINING Re-gaining cannot be started automatically or manually unless the security lock jumper is on. This prevents automatic re-gaining during a sensor calibration (when the security lock jumper must be removed). Furthermore, re-gaining can be started only if the sensor temperature is below 100 °C. At higher temperatures the chemicals evaporate spontaneously from the sensor, and the re-gaining is not necessary.
HMP240 Appendix 7: Re-gaining 3. M210300en LED COMMANDS Re-gaining can be started manually using the LED command ll¡¡ (l = lit, ¡ = dark). Use the up and down press switches (marked with arrows in the printed board) to find the command code and acknowledge it with the ENT switch. The re-gaining parameters stored in the transmitter memory are used. When re-gaining is over the LEDs are dark again.
HMP243 Appendix 7: Re-gaining M210300en 4. DISPLAY/KEYPAD COMMANDS Disconnect the security lock jumper! Press the CL key to enter the command mode. Select More from the first menu using the arrow keys and press ENT key. Select again More from the second menu and press ENT. The following menu is displayed Select Regen and press ENT. To change or inspect the re-gaining parameter settings select Regen. settings and press ENT. To start re-gaining manually select Regeneration and press ENT. 4.1.
HMP240 Appendix 7: Re-gaining M210300en Use arrow keys to change the status of the automatic re-gaining and press ENT. Acknowledge the current setting by pressing ENT. To change the interval press CL. Select the new time interval digit by digit with the arrow keys and acknowledge each digit with ENT key. With CL key you can correct the entry by deleting the digits one by one. When you have entered the whole time interval, press ENT for the second time.
HMP243 Appendix 7: Re-gaining M210300en 5. SERIAL COMMANDS 1.2.1 REG Re-gaining settings REG REG nnn nnn = ON or OFF Command REG is used to check the re-gaining parameter settings and to activate or inactivate the automatic re-gaining. Examples: checking the current settings >reg REG OFF Interval min Duration s Temp diff Settl time s k % > automatic re-gaining is inactive : : : : : 720 120 0.50 240 95.
HMP240 Appendix 7: Re-gaining 1.2.3 CRI M210300en Changing re-gaining parameters CRI With command CRI the values of the re-gaining parameters can be changed. Example: changing the re-gaining interval to 480 min and the settling time after sensor heating to 360 s >cri Interval min Duration s Temp diff Settl time s k % > : : : : : 720 120 0.50 240 95.00 ? 480 ? ? ? 360 ? NOTE To activate new parameter settings immediately, command RESET must be given.
HMP243 Appendix 7: Re-gaining M210300en Example: activating status display >fst on Form. status : >r N 0 RH= 20.8 N 0 RH= 20.7 N 0 RH= 20.7 N 0 RH= 20.8 H 163 RH= 20.8 H 163 RH= 20.8 H 163 RH= 20.8 H 163 RH= 20.8 S 163 RH= 20.8 S 163 RH= 20.8 S 163 RH= 20.8 S 163 RH= 20.8 N 163 RH= 20.8 N 163 RH= 15.0 N 163 RH= 16.7 N 163 RH= 17.4 H 160 RH= 17.7 H 160 RH= 17.7 ON %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH %RH T= T= T= T= T= T= T= T= T= T= T= T= T= T= T= T= T= T= 25.6 25.6 25.
HMP240 Appendix 7: Re-gaining M210300en Example: >regen Regeneration started, press >r S 162 RH= 20.0 %RH T= 26.5 S 162 RH= 20.0 %RH T= 26.5 S 162 RH= 20.0 %RH T= 26.5 ... N 162 RH= 18.4 %RH T= 27.7 N 162 RH= 18.5 %RH T= 27.6 N 162 RH= 18.8 %RH T= 27.
