HMP228 Moisture and Temperature Transmitter for Oil USER'S GUIDE M210282en-A May 2002
PUBLISHED BY Vaisala Oyj P.O. Box 26 FIN-00421 Helsinki Finland Phone : Fax: (+358 9) 894 91 (+358 9) 8949 2227 Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2002 No part of this manual 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 prior written permission of the copyright holder. The contents are subject to change without prior notice.
HMP228 Operating Manual M210282en-A Contents 1. 2. 3. 4. PRODUCT DESCRIPTION ................................................................................................... 1 1.1 General characteristics........................................................................................... 1 1.2 Typical applications ................................................................................................ 1 1.2.1 About the method used for measuring moisture in oil .....................
HMP228 Operating Manual 4.6.1.2 4.6.1.3 4.6.2 4.6.2.1 4.6.2.2 4.6.2.3 4.6.3 5. M210282en-A Using display/keypad commands .............................................................. 28 Using LED commands .............................................................................. 28 Two point temperature calibration............................................................. 28 Using serial commands ............................................................................
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HMP228 Operating Manual M210282en-A 1. PRODUCT DESCRIPTION 1.1 General characteristics The HMP228 transmitter is a microprocessor based instrument for the measurement of moisture in terms of water activity e.g. in the lubrication of circulation systems or in transformer oil. The transmitter incorporates a capacitive thin film sensor. The operation of the sensor is based on changes in its capacitance as the thin polymer film absorbs water molecules.
HMP228 Operating Manual M210282en-A ppm) is that the saturation point remains stable regardless of the oil type or the aging of oil, additives used etc. As water activity exceeds 0.9 aw in any system, there is a risk for segregation (especially if the temperature decreases). The water activity is used for alarming at the point of >0.9 aw that the risk for free water in the system is obvious.
HMP228 Operating Manual M210282en-A 2. INSTALLATION 2.1 Selecting the place of installation for the probe and the transmitter Select a place which gives a true picture of the process. Oil should circulate freely around the sensor; a rapid oil flow is recommended. Install the sensor directly into the circulation system and not into the oil reservoir because of deposition. It is recommended that the sensor head is installed directly in the process through the ball valve assembly.
HMP228 Operating Manual 2.2 M210282en-A Mounting In Figures 2.2.1 and 2.2.2 you can see the dimensions of the HMP228 transmitter and probe: 104 120 CL ENT ø6.5 65 133 145 Figure 2.2.1 Dimensions of the HMP228 electronics housing (in mm) Probe up Probe pushed down Parallel thread A 180 / 400 216 / 435 Tapered thread Ø13.5 Ø12 A:Probe 180mm adjustment range 120mm Probe 400mm adjustment range 340mm Figure 2.2.2 4 Probe dimensions (in mm).
HMP228 Operating Manual M210282en-A fitting body hex = 24mm tapered thread R1/2 ISO 7/1 parallel thread G1/2 ISO 228/1 (BS 2779, JIS B0202) ø19mm drilling >10.5mm >40mm Process or pipe wall sealing with: 1. LOCTITE® No 542 + activ. No 7649 (t=-55...+150 °C) 2. MEGA-PIPE EXTRA No 7188 (t=-55...+170 °C) 3. PTFE tape (t=-60...+210 °C) NOTE: the tape does not lock the parts together. Therefore, use two fork spanners (hex 24 and 27 mm) for tightening and opening the clasp nut of the probe Figure 2.2.
HMP228 Operating Manual 2.2.3 M210282en-A Installing the probe through the ball valve assembly It is recommended that the sensor head is installed in the process through the ball valve assembly. Use a 1/2" ball valve assembly with a hole diameter of 14 mm or more. With this installation, it is not necessary to empty or shut down the process for installing or removing the sensor head. If the sensor head is installed in a process pipe, please note that the nominal size of the pipe must be at least 1 inch.
HMP228 Operating Manual See Figures 2.2.3.2 - 2.2.3.4 for detailed description of installation through the ball valve assembly. Note also that if the sensor head is installed in a process pipe, the nominal size of the pipe must be at least 1 inch. • STEP I: mount the probe with the ball valve assembly closed bushing R1/2 cone/ G1/2 (40 bar) e.g.
HMP228 Operating Manual a d ju s tm e n t r a n g e 1 2 0 m m 148 • STEP 2: open the ball valve assembly ø5.5 53.6 wedge ring nut (AV=27mm) screw A ø14 (40) > ø14 ~ 8 .5 ~ 2 2 .5 O-ring moisture sensor ø12 R1/2 ISO 7/1 sintered filter process pipe or chamber Figure 2.2.3.3 Installing the probe through the ball valve assembly; step 2 (measures in mm) The clasp nut is tightened manually prior to opening the ball valve assembly.
HMP228 Operating Manual M210282en-A • STEP 3: push the probe head through the ball valve assembly into the process. Note that the sensor head must be pushed so deep that the filter is completely inside the process flow. MANUAL PRESS TOOL VALVE OPEN VALVE CLOSED FILTER Figure 2.2.3.4 Installing the probe through the ball valve assembly: step 3 2.2.
HMP228 Operating Manual M210282en-A when the probe is pulled out for maintenance, cap the hole with a capped nut; this way, the process can be open although the probe is not in place capped nut DIN 917-M22x1.5 sealing probe welded sleeve (G1/2) or tube with thick walls closing valve (ball valve) Figure 2.2.4 2.3 Installing the sensor head directly in a process pipe Signal cabling and grounding 2.3.
HMP228 Operating Manual M210282en-A Power supply 24 VDC 24 VAC (see Chapter 2.3.2) 115/230 VAC 0...20 mA 4...20 mA 0...1 V 0...5 V 0...10 V with power supply module Output signals Power supply ground (-) is connected to the housing with parallel connection of 15 nF capacitor and 300 kΩ resistor. See Appendix 3 on how to connect the power supply module to the transmitter. 2.3.2 Connection to an AC supply The HMP228 transmitter can also be connected to an AC supply without an external rectifier.
HMP228 Operating Manual M210282en-A 2.3.3 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.
HMP228 Operating Manual M210282en-A • connect the wires into the screw terminals and fasten a cable tie around the wires Use connectors instead of traditional cabling. See Appendix 8 for connector types available and for detailed instructions.
HMP228 Operating Manual 3. M210282en-A COMMISSIONING When the HMP228 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 9 describes them in detail.
HMP228 Operating Manual M210282en-A makes it impossible to change the transmitter settings by mistake. The jumper should be removed only for changing the settings and for calibration. X15 Change of settings disabled + - + - Ch1 Ch2 Current loop or RS485 module Rx GND Tx 24V nc + - Sensor connections Figure 3.1.1 Location of the security lock jumper When the security lock jumper is connected, some commands cannot be used, see Chapter 4.
HMP228 Operating Manual 3.2 M210282en-A Using the RS 232C serial bus Rx GND Tx X17 + - + - X6 Current loop or RS485 module Ch1 Ch2 Rx GND Tx 24V nc + - Rx GND Tx Nc Sensor connections Figure 3.2.1 Serial bus connections To connect a PC to the HMP228 transmitters via the RS 232C serial bus, one of the following cables is required. The type of cable depends on the terminal and the connector type. PC 2 5 3 D9S 4 6 7 8 3 7 2 D25S 5 6 8 20 3 TERMINAL D25P 7 2 Figure 3.2.
HMP228 Operating Manual M210282en-A NOTE When the serial bus settings are changed, the transmitter has to be reset before the new settings become effective.
HMP228 Operating Manual 3.3 M210282en-A Using 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 transmitters 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.
HMP228 Operating Manual M210282en-A with button s and the second line with button t; all selections are stored with ENTER. The selected quantities appear on the display also after power failure. After reset the transmitters are always in the display mode. The display also shows error messages and alarms if they occur. 3.4.2 Command mode Press the CL key to enter the command mode. The first display is the main menu: The commands can be scrolled with the arrow keys.
HMP228 Operating Manual M210282en-A 4. MAINTENANCE 4.1 Self-diagnostics The HMP228 transmitter goes through a self-diagnostics procedure when the power is switched on. If the procedure does not reveal any errors or faults, the transmitter starts operating normally. If errors or faults are found, check first if the moisture and temperature sensors are damaged. If they are intact, send the transmitter to Vaisala for repairs. The error messages are listed in Appendix 3.
HMP228 Operating Manual M210282en-A 4.3 Moisture calibration The HMP228 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 have changed. The optimal interval for moisture calibrations depends on the process and the recommended interval varies from 3 months to 2 years.
HMP228 Operating Manual M210282en-A 4.3.1 Two point calibration procedure A two point calibration should be performed in stable conditions using saturated salt solutions as references. Disconnect the security lock jumper! 4.3.1.1 • Using 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. Remove the filter cap on the transmitter.
HMP228 Operating Manual M210282en-A 4.3.1.3 Using 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. • Connect an ammeter/voltmeter to the analogue outputs (connector X2). Give command ¡¡¡l. At the first calibration point the LED on the left flashes; adjust the first point (offset) with the arrow switches to the value given in the calibration table (Chapter 4.4.
HMP228 Operating Manual M210282en-A • Press any key and press when the transmitter requests the second point value. RH 4.3.2.2 75.5 Ref2 ? yy.y Using display/keypad commands • Make sure that the sensors of the transmitter and the reference instrument are close to each other. Allow enough time for the sensors to stabilize to the measurement conditions. • Select Cali in the main menu and then RH cal; select Not changed and then one point offset calibration RH 1 point cal.
HMP228 Operating Manual M210282en-A 4.4.1 Calibration procedure after sensor change Humidity calibration should be performed in stable conditions using saturated salt solutions as a reference. Disconnect the security lock jumper! 4.4.1.1 Using 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. Remove the filter cap on the transmitter.
HMP228 Operating Manual M210282en-A • 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 calibration hole of the NaCl chamber of the humidity calibrator. • Wait at least 30 minutes. • If necessary, change the second point reading with the arrow keys and press ENT. 4.4.1.
HMP228 Operating Manual M210282en-A 4.4.5 Humidity calibration table Temperature LiCl 4...20 mA 0...20 mA 0...1 V 0...5 V 0...10 V NaCl 4...20 mA 0...20 mA 0...1 V 0...5 V 0...10 V Table 1 °C °F %RH 15 59 * 20 68 11.3 5.81 2.26 0.113 0.565 1.13 25 77 11.3 5.81 2.26 0.113 0.565 1.13 30 86 11.3 5.81 2.26 0.113 0.565 1.13 35 95 11.3 5.81 2.26 0.113 0.565 1.13 %RH 75.6 16.10 15.12 0.756 3.780 7.56 75.5 16.08 15.10 0.755 3.775 7.55 75.3 16.05 15.06 0.753 3.765 7.53 75.1 16.02 15.02 0.751 3.755 7.
HMP228 Operating Manual M210282en-A T : 0.90 T : 0.55 T : 0.55 Press any • 4.6.1.2 Ref1 ? c Ref1 ? c Ref1 ? 0.0 key when ready... After giving the correct temperature value (Ref1) and pressing press any key and then . Using 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.
HMP228 Operating Manual M210282en-A • If you want to see how the sensor stabilizes to the reference temperature, enter c instead of the first reference: T : 0.90 T : 0.55 T : 0.55 Press any Ref1 ? c Ref1 ? c Ref1 ? 0.0 key when ready... • Change the temperature and again check the transmitter against the reference. • Check that the reading corresponds with the reading of the reference instrument. If not, adjust the second point.
HMP228 Operating Manual 4.6.3 M210282en-A • Check that the reading corresponds with the reading of the reference instrument. If not, adjust the second point. • If necessary, adjust with the arrow switches to the correct value and press ENT. At the second calibration point the second LED from the left flashes. Temperature channel adjustment with Pt 100 simulators Switch the power off and disconnect the wires to the Pt 100 sensor from solder lugs TP5, TP6 and TP7. TP6 TP7 X88 TP5 Figure 4.6.3.
HMP228 Operating Manual M210282en-A T = D0 +R x {D1 + R x [D2 + R x (D3 + R x D4)]} where D0 D1 D2 D3 D4 4.7 = = = = = -243.5673014 2.278542701 0.002050681 -6.15025E-06 1.34949E-08 Analogue output channels 4.7.1 Setting the analogue outputs The HMP228 transmitters can be ordered with the required current or voltage outputs already selected. If the outputs need to be changed, move the jumpers in connector X15 into positions as shown in Figure 4.7.1.2.
Ch1 Ch2 HMP228 Operating Manual M210282en-A Ch1Ch2 Ch1 Ch2 Ch1 Ch2 Ch1 Ch2 Current outputs 0... 20/4... 20 mA Ch1Ch2 Voltage outputs 0... 5/0... 10 V X15 Ch1Ch2 Voltage outputs 0... 1 V + - + - Ch1 Ch2 Current loop or RS485 module Rx GND Tx 24V nc + - Ch1Ch2 Ch1 0... 1 voltage ouput Ch 2 current output Sensor connections Figure 4.7.1.2 Selecting the analogue outputs with jumpers All jumpers are used only with the 0...1 V outputs.
HMP228 Operating Manual M210282en-A 4.7.1.2 Using display/keypad commands 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.
HMP228 Operating Manual M210282en-A 4.7.2 Selecting and scaling the analogue output quantities Disconnect the security lock jumper! 4.7.2.1 Using serial output ASEL xxx yyy xxx yyy = = channel 1's quantity channel 2's quantity (Aw, T) Example: water activity is selected on channel 1 and temperature on channel 2 >ASEL aw Ch1 (aw) Ch1 (aw) Ch2 (T ) Ch2 (T ) T lo 0.000 hi 1.000 lo -40.000 hi +160.
HMP228 Operating Manual M210282en-A • If the settings need to be changed, press CL: − the quantity (aw, T) starts flashing; it can be changed with the arrow keys and acknowledged with the ENT key − the lower limit starts flashing − acknowledge the lower limit with ENT or start changing it by pressing CL; a new lower limit is given with the arrow keys − the upper limit starts flashing − acknowledge the upper limit with ENT or start changing it by pressing CL; a new upper limit is given with the arro
HMP228 Operating Manual M210282en-A + X15 X2 + + - Ch1 - Ch2 - + - Ch1 Ch2 Current loop or RS485 module Rx GND Tx 24V nc + - Sensor connections Figure 4.8.1.1 Location of the CH1 and CH2 test points mA X2 CH1+ CH1CH1+ TEST POINTS CH1- RL Figure 4.8.1.2 Circuit diagram of the analogue output current test points. 4.8.
HMP228 Operating Manual M210282en-A 4.8.1.1 Using serial commands 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...10 V outputs (set with AMODE command); enter the voltages measured at the analogue outputs: >ACAL Ch1 U1 ( V Ch1 U2 ( V Ch2 U1 ( V Ch2 U2 ( V 4.8.1.2 ) ) ) ) ? ? ? ? 0.123 9.980 0.120 9.
HMP228 Operating Manual M210282en-A 4.8.1.3 Using 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 made using the LED commands! • connect an ammeter/voltmeter to the analogue outputs (connector X2) • Give command ¡¡ll.
HMP228 Operating Manual M210282en-A X16 + - + - Ch1 Ch2 Current loop or RS485 module Rx GND Tx 24V nc + - Sensor connections Figure 4.9.2 Forcing the serial port settings back to factory settings 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.
HMP228 Operating Manual M210282en-A 5. TECHNICAL DATA 5.1 Water activity Measuring range of water activity 0...1 Accuracy (including nonlinearity and repeatability) maximum achievable accuracy when calibrated against high quality, when calibrated against salt solutions (ASTM E104-85): ±0.02 (0...0.9) ±0.03 (0.9...1.0) maximum achievable accuracy when calibrated against high-quality, certified humidity standards: ±0.01 (0...0.9) ±0.02 (0.9...1.
HMP228 Operating Manual M210282en-A 5.5 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 (0.15") character height Keyboard 1 x 4 keypad Connections screw terminals, 0.5 mm2 wires (AWG 20), stranded wires recommended Operating voltage 24 VDC / isolated 24 VAC (20...28 V) option 5.
HMP228 Operating Manual M210282en-A Bushing for 7...10 mm diameter cable (8 x 0.5 mm2 shielded cable) Sensor protection Stainless steel filter (part no. HM46999) Housing dimensions 145 x 120 x 65 mm Sensor head dimensions (see Figure) length 170 mm, Ø 13.5 mm: Probe up Probe pushed down Parallel thread A 180 / 400 216 / 435 Tapered thread Ø13.5 Ø12 A:Probe 180mm adjustment range 120mm Probe 400mm adjustment range 340mm Cable diameter 5.
HMP228 Operating Manual M210282en-A 5.7 Electromagnetic compatibility The emission and immunity tests have been performed according to thestandard EN61326-1:1997+Am1:1998; Industrial environment. 5.7.1 Emissions Test: Setup according to: Radiated emissions EN 55022/CISPR 22 (class B) With power supply unit (HMP230PW): Conducted emissions EN 55022/CISPR 22 (class B) Harmonic currents EN/ IEC 61000-3-2 Voltage fluctuations EN/ IEC 61000-3-3 5.7.
HMP228 Operating Manual 6. M210282en-A OPTIONS Power supply module Operating voltage 7.
M210282en-A HMP228 Transmitters Appendix 1: Serial commands APPENDIX 1: SERIAL COMMANDS 1. ANALOGUE OUTPUT COMMANDS ...................................................................................... 46 AMODE Setting the analogue outputs ..................................................................... 46 ASEL Selecting the scaling the analogue output quantities...................................... 46 ASCL Scaling the analogue outputs ...............................................................
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A For example, water activity is selected to be output on channel 1 and temperature on channel 2; the temperature range is scaled to 0...100 °C: >ASEL RH Ch1 (aw) Ch1 (aw) Ch2 (T ) Ch2 (T ) T lo 0.000 hi 1.000 lo -40.000 'C hi +160.000 'C ? ? ? 0 ? 100 When the ASEL command is given on its own, the transmitter outputs its current settings: >ASEL Ch1 (aw) lo Ch1 (aw) hi Ch2 (T ) lo Ch2 (T ) hi 0.000 1.000 -40.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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, water activity is scaled to 0...1.00 on channel 1 and temperature to -40...+100 °C on channel 2: >ASCL 0 Ch1 (aw) Ch1 (aw) Ch2 (T ) Ch2 (T ) 48 1 -40 100 lo 0.000 hi 1.000 lo -40.000 'C hi 100.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A CALIBRATION COMMANDS CRH Relative humidity calibration Disconnect the security lock jumper! CRH With this command the transmitters 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.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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 ? 11.3 FCRH 2 ... RH : 76.30 Ref2 ? 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.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A ACAL Calibrating the analogue outputs Disconnect the security lock jumper! ACAL Calibrates the outputs selected on channels 1 and 2. The output is measured and the measured values (mA or V) entered as calibration coefficients. For example, calibrating the outputs when 0...10 V signal has been selected on both channels (set with AMODE command): >ACAL Ch1 U1 (V Ch1 U2 (V Ch2 U1 (V Ch2 U2 (V L ) ) ) ) ? ? ? ? 0.123 9.980 0.120 9.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A NOTE The temperature unit in offset correction is always degrees Centigrade, even if the transmitter is using nonmetric units (Fahrenheit) in its measurement output. 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 which variables are in use.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A SEND Outputting a reading once SEND in STOP state or SEND aa aa = in POLL state address of the transmitter when more than one transmitter is connected to a serial bus (0...99; set with command ADDR) Outputs the current measurement readings via the serial line. The output format depends on which parameters the transmitter can output. Output types are: "aw= .999 T=999.9 'C", The output mode can be changed with command FORM.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A If errors have occurred, the transmitter outputs the error code (see Appendix 5 for error messages): >ERRS E40 f ( all ) > ECHO out of range 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.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A FORM 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. \aa..aa\ \TT..TT\ \uu..
HMP228 Transmitters Appendix 1: Serial commands FTIME M210282en-A 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. time : ON >intv 5 s Output intrv. : 5 >r 09:31:13 aw= 0.195 T= 09:31:18 aw= 0.195 T= 09:31:23 aw= 0.195 T= 09:31:28 aw= 0.195 T= 09:31:33 aw= 0.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A Activating the date output >fdate on Form. date >r 1995-03-10 1995-03-10 1995-03-10 1995-03-10 1995-03-10 ... : aw= aw= aw= aw= aw= ON 0.206 0.206 0.206 0.206 0.206 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 aw= 0.202 T= aw= 0.202 T= aw= 0.202 T= aw= 0.202 T= aw= 0.202 T= ... SERI : OFF 26.0 26.0 26.0 26.0 26.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A NOTE The serial bus settings become effective only after reset. 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.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A When asking the current address, no address number is given: >ADDR Address : 2 ? RESET Resetting the transmitter RESET Resets the transmitter. All settings that have been changed stay in the memory even after reset or power failure.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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 When more than one transmitter is connected to the same serial bus, the POLL mode makes it possible to communicate with the transmitters.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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.
HMP228 Transmitters Appendix 1: Serial commands MTIM M210282en-A Setting the measurement integration time MTIM nnn nnn = number of cycles measured (4...255) By lengthening the measurement integration time any stray changes in the output can be filtered out: the transmitter calculates the average of a number of measurement cycles defined by the user.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A XPRES Setting the pressure for mixing ratio 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 with XPRES command the setting is valid only until a reset is given, power is turned off or pressure is set to zero with XPRES. After this the pressure stored with command PRES is valid again.
HMP228 Transmitters Appendix 1: Serial commands TIME M210282en-A Setting the time 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 228 / x.yy where x.yy is the programme version. ? Outputting the transmitter settings ? For example: >? HMP 228 / 1.
HMP228 Transmitters Appendix 1: Serial commands M210282en-A 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.
HMP228 Appendix 2: Display commands M210282en-A APPENDIX 2: DISPLAY COMMANDS 1. DISPLAY COMMANDS .......................................................................................................... 67 1.1 Display/keypad commands ......................................................................................... 67 1.1.1 Output via the serial bus ................................................................................ 67 1.1.1.1 Turning the serial interface echo ON/OFF .................
HMP228 Appendix 2: Display commands M210282en-A 1. DISPLAY COMMANDS The HMP228 transmitter uses a microprocessor; therefore its configuration can be set according to the user's needs. This is done through commands. Most often the commands are used to change the settings of the two analogue channels. A full range of commands can be given through the display/keypad. The commands can be used e.g.
HMP228 Appendix 2: Display commands M210282en-A Selecting parity: Selecting data bits: 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 HMP228 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 afte
HMP228 Appendix 2: Display commands M210282en-A • Pressing ENT returns the programme to the main menu. • Pressing CL deletes the old address; enter the new address with the arrow keys. 1.1.1.4 Selecting the output units • Select Unit in the main menu: • Use the arrow keys to select the right alternative and press ENT. metric aw T 1.1.
HMP228 Appendix 2: Display commands 1.1.2.1 M210282en-A Setting the serial interface operation mode • Select Mode in the main menu; the following is displayed: • Select Serial output: • The currently valid setting flashes. Select the desired mode with the arrow keys and press ENT. After this the programme returns to the Mode Menu.
HMP228 Appendix 2: Display commands M210282en-A 1.1.3 Others 1.1.3.1 Setting the measurement integration time By lengthening the measurement integration time any stray changes in the output can be filtered out: the transmitter calculates the average of a number of measurement cycles defined by the user. • Select More in the main menu, select More in the More menu and select Mtim in the second More menu: • Pressing ENT returns the programme to the main menu without changing the integration time.
HMP228 Appendix 2: Display commands 1.1.3.3 M210282en-A 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.
M210282en-A HMP228 Appendix 3: Power supply module APPENDIX 3: POWER SUPPLY MODULE 1. INSTALLING THE POWER SUPPLY MODULE ..................................................................... 74 2. TECHNICAL SPECIFICATIONS.............................................................................................
HMP228 Appendix 3: Power supply module 2. M210282en-A INSTALLING THE POWER SUPPLY MODULE The mains power connection may be connected to the power supply module only by an authorized electrician. A readily accessible disconnect device shall be incorporated in the fixed wiring (IEC 950). 1. 2. 3. 4. 5. Remove the plastic plug in the transmitter housing and replace it with the cable gland.
M210282en-A HMP228 Appendix 3: Power supply module Peel the correct power supply voltage from the sticker enclosed in the power supply module package and attach it on the instrument label to indicate that the supply voltage has been changed. NOTE The power supply module cannot be used if the re-gaining option has been activated. WARNING Do not detach the power supply module from the transmitter when the power is on. Do not connect the power supply to mains when it is not installed in the transmitter.
HMP228 Appendix 3: Power supply module 3. M210282en-A TECHNICAL SPECIFICATIONS Operating voltage 115 VAC (93...127 V) 230 VAC (187...253 V) Connections input screw terminals output screw terminals 1.5 mm2 wire (AWG 16) 2.5 mm2 wire (AWG 20) Bushing for 7...12 mm diameter cable Indicator PWR ON LED on power supply module board Operating temperature range -40...+45 °C Storage temperature range -40...+70 °C NOTE The power supply module cannot be used if the regaining option has been activated.
M210282en-A HMP228 Appendix 4: RS 485/422 serial port module APPENDIX 4: INSTALLING AND USING THE RS 485/422 SERIAL PORT MODULE 1. INSTALLATION ..................................................................................................................... 78 2. OPERATION .......................................................................................................................... 79 3. NETWORK CONFIGURATION .................................................................................
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 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 HMP228 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 2. OPERATION The HMP228 transmitters 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 HMP228 transmitter is used; when several transmitters are connected to the same line, each transmitter must be given an address in the initial configuration.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 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).
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 3. NETWORK CONFIGURATION 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.
HMP228 Appendix 4: RS 485/422 serial port module • M210282en-A Set the address of the transmitter; it can be 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.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 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.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A NOTE 1 The SMODE command must be given last. 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 aw= 0.244 T= 29.1 'C • Disconnect the terminal. • Check that the jumpers in connector X4 are in the right places. X1 X2 X4 X4 84 • Remount the RS 485/422 serial module. • Close the cover.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 4. CHECKING THE SERIAL PORT NETWORK OPERATION Normally measurement readings are asked when the transmitter is in POLL mode; then 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.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A POLL mode If a transmitter has been set to POLL mode, it will respond only to commands which include its address: send 22 aw= 0.244 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. The line terminations must be dynamic; e.g.
HMP228 Appendix 4: RS 485/422 serial port module M210282en-A 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.
HMP228 Appendix 5: Digital current loop module M210282en-A APPENDIX 5: INSTALLING AND USING THE DIGITAL CURRENT LOOP MODULE 1. INSTALLATION ..................................................................................................................... 89 2. OPERATION .......................................................................................................................... 90 3. NETWORK CONFIGURATION .....................................................................................
HMP228 Appendix 5: Digital current loop module M210282en-A 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 HMP228 transmitter; connector X1 on the module board to connector X4 and connector X2 to connector X5. RX GND TX X17 Current loop module X1 X2 DATA LOOPS 1.
HMP228 Appendix 5: Digital current loop module 2. M210282en-A OPERATION The HMP228 transmitters 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 HMP228 transmitter is used; when several transmitters are connected to the same line, each transmitter must be given an address in the initial configuration.
M210282en-A HMP228 Appendix 5: Digital current loop module The digital current loop module has separate lines for transmitting and receiving. Both single loop wiring and dual loop wiring can be used (see figure). Dual loop connection makes it possible to have a few more transmitters on the same loop pair. A single loop connection has simpler wiring. Data transmission is achieved by switching the loop current on and off.
HMP228 Appendix 5: Digital current loop module 3. M210282en-A NETWORK CONFIGURATION Single loop operation Bi-directional data on one pair and galvanic isolation are the advantages of the current loop. Single pair/dual pair use is configured through wiring (see figure). Supplying power from the same end to the loops prevents crossover voltages. • Connect wires to the transmitter's serial connector. • Check the wiring. The following procedure must be repeated with all transmitters.
HMP228 Appendix 5: Digital current loop module M210282en-A • Set the transmitter in POLL mode: >smode poll Serial mode : POLL NOTE 1 The SMODE command must be given last. 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 aw= 0.244 T= 29.1 'C • Disconnect the terminal. • Remount the digital current loop module. • Close the cover.
HMP228 Appendix 5: Digital current loop module M210282en-A Dual loop wiring • Set the address of the transmitter, it can be 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 system.
HMP228 Appendix 5: Digital current loop module M210282en-A 4. CHECKING THE SERIAL PORT NETWORK OPERATION Normally, measurement readings are asked when the transmitter is in POLL mode; then 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.
HMP228 Appendix 5: Digital current loop module M210282en-A POLL mode If a transmitter has been set to POLL mode, it will respond only to commands which include its address: send 22 aw= 0.244 T= 29.1 'C Addresses from 1 to 99 can be used. According to the 20 mA current loop standard current flows with no transmission on line. A maximum of 6 devices can be connected on same single loop line, but the number can be increased to 9 by using dual loop wiring.
HMP228 Appendix 5: Digital current loop module M210282en-A 5. 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.
HMP228 Appendix 6: Error messages M210282en-A APPENDIX 6: ERROR MESSAGES The HMP228 transmitters go through a self-diagnostics procedure when the power is switched on. When the procedure does not reveal any errors or faults, the transmitter starts operating normally. If errors or faults are found, the transmitter outputs an error message. The error messages can be divided into two groups: error messages after reset and error messages during operation.
HMP228 Appendix 6: Error messages M210282en-A Errors during operation Two types of errors are possible during operation of the transmitters. The first type indicates that no frequency comes from the converter.
HMP228 Appendix 6: Error messages M210282en-A The LEDs display these error types as follows: ¡¡¤¤ no frequency at all ¡¡¤¡ a frequency missing from the RH channel ¡¡¡¤ a frequency missing from the T channel The second error type indicates erroneous y-values (used in internal calculations): Display: Serial bus: E51 T y-value out of range E53 U1 y-value out of range The LEDs display these error types as follows: 100 ¤¡¡¡ RH channel y-value out of range ¡¤¡¡ T channel y-value out of range
HMP228 Appendix 7: Alarm output unit M210282en-A ALARM OUTPUT UNIT The alarm output unit consists of two alarm relays and two opto-isolated outputs (see Figure 1). The relay output 1 is available at screw terminal X1 and the relay output 2 at screw terminal X2. The opto-outputs are activated simultaneously with the corresponding relays and available at screw terminal X5. SELECT: ALARM 1ALARM 2 SPCO relay outputs X2 max. 8 A X1 C NONC CNONC or ALARM 1 + ALARM 2+ opto-outputs max.
HMP228 Appendix 7: Alarm output unit M210282en-A ribbon cable X16 M3 screws (4 pcs) for mounting (prefix with fibre washers) X3 M4 screw and washer for protective ground terminal +- +- +- replace the plastic plug with cable gland for ¢7...
HMP228 Appendix 7: Alarm output unit M210282en-A - the third parameter (in this example HI ON) starts blinking. This parameter determines whether the alarm output is in use or not, and when it is activated. The selection is acknowledged with ENT.
HMP228 Appendix 7: Alarm output unit M210282en-A When giving this command, first enter the channel number i.e. the number of the alarm output you wish to use (1 or 2). Then select the quantity you wish to have on that channel (aw or T). The third parameter (HI/LO) determines whether the alarm is activated when the setpoint value is exceeded (HI) or not reached (LO). The fourth parameter is the actual setpoint value which activates the alarm.
M210282en-A HMP228 Appendix 8: Connectors APPENDIX 8: CONNECTORS 1.1 Connector options .................................................................................................... 106 1.2 Analogue outputs ..................................................................................................... 106 1.3 Serial connections .................................................................................................... 107 1.
HMP228 Appendix 8: Connectors M210282en-A 1.1 Connector options The HMP228 moisture transmitter can be ordered with various connector configurations meaning that the sleeve or plug of the standard transmitter has been replaced with a connector. In the following, various options and signals. FEMALE Figure 1 1.2 MALE Connector location Analogue outputs Analogue outputs are selected when ordering the transmitter (order form has options for 0... 20 mA, 4... 20 mA, 0... 1V, 0.... 5V and 0... 10V).
HMP228 Appendix 8: Connectors M210282en-A 1.3 Serial connections Also an RS232C serial bus can be connected to the connector; in this case, the connector is used mainly for maintenance and calibration purposes. Alternatively, a two wire RS 485 net can be built through the connector; in this case, also the power supply (24 VDC) is chained through transmitters. RS232C connection Part # 19371 1 2 3 4 5 Connection X6/Rx X6/Tx X6/GNDX1/NC X1/NC The male connector (part n.
HMP228 Appendix 8:Connectors 1.4 M210282en-A Instructions for connecting and mounting the counter pieces The counter piece has to be grounded as shown in Figure 1.4 in order to maintain a complete EMC protection. The recommended cable is a shielded cable with an outer diameter of 4 - 6 mm, e.g. PFSK 6 x 0.22 mm. bend the sheath over the pole piece no strands on the O-ring O-ring first tightening Figure 1.
APPENDIX 9
