USER'S GUIDE Vaisala HUMICAP® Humidity and Temperature Transmitter HMT310 M210619EN-E
PUBLISHED BY Vaisala Oyj Street address: Mailing address: Phone: Fax: Vanha Nurmijärventie 21, FI-01670 Vantaa, Finland P.O. Box 26, FI-00421 Helsinki, Finland +358 9 8949 1 +358 9 8949 2227 Visit our Internet pages at www.vaisala.com.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 9 About This Manual ................................................................... 9 Version Information ............................................................. 10 Related Manuals ................................................................. 10 Documentation Conventions .................
User's Guide _______________________________________________________________________ Power Supply Requirements ................................................. 34 CHAPTER 4 OPERATION ................................................................................................. 35 Power Supply .......................................................................... 35 Transmitter Start-Up ............................................................... 35 Serial Line and Analog Communication Options ..
_________________________________________________________________________________ Chemical Purge in Powerup................................................ 60 Chemical Purge Activated Manually .................................... 60 Starting Manual Chemical Purge ........................................ 60 Sensor Heating (Optional) ..................................................... 61 General ................................................................................
User's Guide _______________________________________________________________________ CHAPTER 7 TECHNICAL DATA ...................................................................................... 87 Specifications ......................................................................... 87 Calculated Variables............................................................ 90 Accuracies of Calculated Variables ..................................... 90 Accuracy of Dewpoint Temperature °C .......................
_________________________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 HMT310 Transmitter Parts .......................................................
User's Guide _______________________________________________________________________ List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Manual Revisions ..................................................................... 10 Related Manuals .......................................................................
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the HMT310. About This Manual This manual provides information for installing, operating, and maintaining Humidity and Temperature Transmitter HMT310. This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the HMT310.
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Code M210619EN-E M210619EN-D M210619EN-C Manual Revisions Description March 2014. This manual. New software functionality applicable from version 2.0.1 onward. Voltage output added to analog output options, new voltage parameters in the AMODE command. Multipoint calibration instructions and MPC command added.
Chapter 1 _________________________________________________________ General Information Safety The Humidity and Temperature Transmitter HMT310 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: WARNING Ground the product and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction.
User's Guide _______________________________________________________________________ Recycling Recycle all applicable material. Dispose of the unit according to statutory regulations. Do not dispose of with regular household refuse. Regulatory Compliances The Humidity and Temperature Transmitter HMT310 complies with the following performance and environmental test standards: - EMC standard EN61326-1, Industrial environment.
Chapter 1 _________________________________________________________ General Information Trademarks HUMICAP® is a registered trademark of Vaisala. Windows® is a registered trademark of Microsoft Corporation in the United States and/or other countries. Software License This product contains software developed by Vaisala.
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Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature. Introduction to HMT310 The Vaisala HUMICAP® Humidity and Temperature Transmitter HMT310 is a small size humidity and temperature transmitter that powers up with 10 ... 35 VDC (mode-dependent power supply requirements).
User's Guide _______________________________________________________________________ Output Quantities Table 3 HMT310 Output Quantities Quantity Relative humidity Temperature Dewpoint/Frostpoint Dewpoint Absolute humidity Mixing ratio Wet bulb temperature Humid air volume/ dry air volume Water vapor pressure Saturation water vapor pressure Enthalpy NOTE Abbreviation RH T TDF TD A X TW PPM (parts per million) PW PWS Metric Unit %RH °C °C °C 3 g/m g/kg °C ppm Nonmetric Unit %RH °F °F °F 3 gr/ft gr/lb °
Chapter 2 ___________________________________________________________ Product Overview HMT310 Transmitter Parts 1403-180 Figure 1 HMT310 Transmitter Parts The following numbers refer to Figure 1 above: 1 = Transmitter unit 2 = Mounting plate (smaller mounting plate also available) 3 = Connector for signal output and power supply. Available with female connector with 5 m cable or screw terminal connector.
User's Guide _______________________________________________________________________ Probe Options 0507-033 Figure 2 HMT310 Probes The following numbers refer to Figure 2 above: 1 2 3 4 = = = = HMT311 for wall mounting HMT313 for general use HMT314 for pressurized spaces up to 100 bar HMT315 for high temperatures up to 180 °C (242 mm probe length, vapor-tight) 5 = HMT317 for demanding processes (warmed and vapor-tight probe) 6 = HMT318 for pressurized pipelines (40 bar, ball valve) *) Flange for HMT3
Chapter 2 ___________________________________________________________ Product Overview Filter Options There are several filter types for HMT310. All filters are 12 mm in diameter with a female thread, and are compatible with all HMT310 probe models. The filters recommended for a probe type can be selected on the corresponding HMT310 order form. For a list of the available filters and ordering information, see section Spare Parts and Accessories on page 93.
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Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the HMT310. Measuring at Overpressure HMT314 and HMT318 are designed for humidity measurement at overpressure. The maximum measurement pressures depend on the probe as follows: - HMT314: 0 ...
User's Guide _______________________________________________________________________ Mounting the Transmitter/Removing the Transmitter Unit Select a place with stable conditions for mounting the transmitter. Do not expose the transmitter to direct sunlight or rain. Always mount the transmitter housing with the cable bushings pointing downwards. NOTE If the transmitter is mounted outdoors cover it with a shelter (purchased by customer).
Chapter 3 ________________________________________________________________ Installation A B 0507-035 Figure 4 Mounting Plate Dimensions The following letters refer to Figure 4 above: A = Larger mounting plate dimensions B = Smaller mounting plate dimensions VAISALA ________________________________________________________________________ 23
User's Guide _______________________________________________________________________ Mounting the Transmitter with Optional Rain Shield If you mount HMT310 outdoors, use a shelter to protect the transmitter. An HMT310 rain shield is available from Vaisala as an optional accessory (order code ASM211103). NOTE Vaisala does not recommend installing the transmitter outdoors with the smaller mounting plate (without flanges). Use the larger mounting plate with flanges for outdoor installations.
Chapter 3 ________________________________________________________________ Installation Mounting the Probes Do not unsolder and then again resolder the probe cable from the mother board during installation; this may alter the humidity calibration of the transmitter. Beware of Temperature Differences In humidity measurement and especially in calibration it is essential that the temperature of the probe and the measuring environment is the same.
User's Guide _______________________________________________________________________ General Instructions for Probes with Cable It is recommended that the probes with a cable are mounted with the probe horizontal; this way, any water condensing on the tube cannot flow onto the sensor. 0507-024 Figure 7 Horizontal Mounting of Probe The following numbers refer to Figure 7 above: 1 2 3 4 = = = = To be sealed To be insulated Insulate Let the cable hang loosely.
Chapter 3 ________________________________________________________________ Installation 0507-022 Figure 8 Vertical Mounting of Probe The following numbers refer to Figure 8 above: 1 2 3 4 CAUTION = = = = To be sealed Insulate the cable To be insulated Let the cable hang loosely. This prevents condensed water running to the sensor along the cable. Do not attach a heated probe (HMT317) to metal structures to avoid condensation problems caused by heat conduction along the metal.
User's Guide _______________________________________________________________________ See Appendix A on page 99 for the following probe installation kits for HMT313 and installation examples: - Duct mounting kit - Cable gland HMT314 for Pressurized Spaces HMT314 probe is for humidity measurements in pressurized rooms and industrial processes. The probe is provided with a nut, a fitting screw and a sealing washer.
Chapter 3 ________________________________________________________________ Installation 4. 5. Mark both the fitting screw and the nut hex. Tighten the nut a further 30° (1/12 turn) or if you have a torque wrench tighten it with a torque of 80 ± 10 Nm (60 ± 7 ft-lbs). 0505-273 Figure 10 NOTE Marking the Nut When re-tightening the nut after detachment the nut must be tightened without increased effort. 6. Clean and grease the tightening cone of the fitting screw after every tenth detachment.
User's Guide _______________________________________________________________________ HMT317 for Demanding Processes The HMT317 is for environments where relative humidity is very high, near saturation. The warmed probe prevents the saturation of the sensor.
Chapter 3 ________________________________________________________________ Installation The following two fitting body options are available: - Fitting Body ISO1/2 solid structure - Fitting Body NPT1/2 solid structure Table 4 Probe Type Standard Optional HMT318 Probe Dimensions Probe Dimension 178 mm 400 mm Adjustment Range 120 mm 340 mm 0507-025 Figure 12 Sealing of Fitting Body into Process Tightening the Clasp Nut 1. 2. 3. 4.
User's Guide _______________________________________________________________________ 0505-276 Figure 13 Tightening the Clasp Nut The following numbers refer to Figure 13 above: 1 2 3 4 = = = = Probe Clasp nut Fitting screw Pen (for marking) NOTE Take care not to overtighten the clasp nut to avoid difficulties when opening it. CAUTION Take care not to damage the probe body. A damaged body makes the probe less tight and may prevent it from going through the clasp nut.
Chapter 3 ________________________________________________________________ Installation Connections When the HMT310 leaves the factory, the measurement ranges, output scaling and quantities have already been set according to the customer order. The unit is calibrated at the factory and ready for use.
User's Guide _______________________________________________________________________ Power Supply Requirements The supply voltage requirements depend on the output type, used functionalities and pressure: - RS-232 output (without heating and purge): 10 ... 35 VDC. Analog output: 15 … 35 VDC Heating and purge: 15 ... 35 VDC. Pressures above 10 bara (145 psia): minimum 24 VDC Table 5 below lists the HMT310 current consumption for different output types and functions.
Chapter 4 _________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate the HMT310. Power Supply Use a 10 … 35 VDC power supply (required minimum voltage varies depending on the operating environment, functions and output type). For instructions on selecting the correct operating voltage, see section Power Supply Requirements on page 34.
User's Guide _______________________________________________________________________ Serial Line and Analog Communication Options HMT310 measurement data can be accessed with the following serial or analog options: - RS-232 serial port connection to a computer - Analog output (current or voltage) For temporary access, you can also connect to the transmitter with the following: - USB connection to a computer using an optional USB cable (order code 238607).
Chapter 4 _________________________________________________________________ Operation USB Connection When performing temporary checks or adjustments, HMT310 can be connected to a computer by using a USB cable (238607). The USB cable is an optional accessory: for more information on ordering optional items, see section Spare Parts and Accessories on page 93. NOTE Before starting to use the USB cable, you must install the USB cable driver (requires Windows).
User's Guide _______________________________________________________________________ Connection to an MI70 Hand-held Indicator HMT310 can be connected to the hand-held MI70 indicator by using the MI70 connection cable (DRW216050SP). The MI70 connection cable is an optional accessory: for more information on ordering optional items, see section Spare Parts and Accessories on page 93.
Chapter 4 _________________________________________________________________ Operation Terminal Program Settings The instructions below describe how to connect to the HMT310 using the PuTTY terminal application for Windows (available for download at www.vaisala.com). Perform the necessary cabling and configuration of the transmitter before following the instructions. Opening a Serial/USB Connection with PuTTY 1. 2. 3. Power up the HMT310 and start the PuTTY application.
User's Guide _______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. In the command examples, the keyboard input by the user is in bold type. The notation refers to pressing the carriage return (Enter) key on your computer keyboard. Enter a to clear the command buffer before starting to enter commands. In the tables below, the bold text in the brackets is the default setting.
Chapter 4 _________________________________________________________________ Operation Table 8 Other Commands Command ? ?? ECHO [ON/OFF] FIND HELP PRES XPRES FILT RESET ERRS Table 9 Setting, Scaling and Testing Analog Outputs Command AMODE Description Set analog outputs (0/4 ...
User's Guide _______________________________________________________________________ Measurement Output Start Continuous Outputting Syntax: R Starts output of measurements to the peripheral devices (RUN mode); the only command that can be used is S (stop). The output mode can be changed with the FORM command. Example: >r RH= RH= RH= RH= RH= RH= 28.0 28.0 28.0 28.0 28.0 28.0 %RH %RH %RH %RH %RH %RH T= T= T= T= T= T= 23.3 23.3 23.3 23.3 23.3 23.
Chapter 4 _________________________________________________________________ Operation Output Reading Once Syntax in STOP mode: SEND Syntax in POLL mode: SEND aa Where aa = Address of the transmitter when more than one transmitter is connected to a serial bus (0 ... 99).
User's Guide _______________________________________________________________________ Example: >seri o changing parity only 4800 o 7 1 >seri 600 n 8 1 changing all parameters 600 n 8 1 Set Transmitter Address for Use in POLL Mode Syntax: ADDR aa Where aa = Address (0 ... 99) Example: >addr Address >addr 1 Address : 0 : 1 Temporarily Open Transmitter from POLL Mode to Receive Serial Commands Syntax: OPEN nn Where nn = Address of the transmitter (0 ...
Chapter 4 _________________________________________________________________ Operation Set Transmitter in POLL Mode Syntax: CLOSE In STOP mode: the command OPEN has no effect, CLOSE sets the transmitter temporarily in POLL mode. In POLL mode: the command OPEN sets the transmitter temporarily in STOP mode, CLOSE returns the instrument to POLL mode. Example: Relative humidity calibration is performed at transmitter 2, which is in POLL mode. >open 2 Opens the line to transmitter 2.
User's Guide _______________________________________________________________________ Table 13 Quantity Abbreviations for FORM Command Abbreviation RH T TDF TD A X TW PPM PW PWS H NOTE Quantity Relative humidity Temperature Dewpoint/Frostpoint Dewpoint Absolute humidity Mixing ratio Wet bulb temperature Humid air volume/dry air volume Water vapor pressure Saturation water vapor pressure Enthalpy Only quantities selected when ordering the device can be selected for an output quantity.
Chapter 4 _________________________________________________________________ Operation Set Time and Date Syntax: TIME Syntax: DATE Sets the time and date to the transmitter. Example: >time Current time is 04:12:39 Enter new time (hh:mm:ss) ? 12:24:00 >date Current date is 2000-01-01 Enter new date (yyyy-mm-dd) ? 2004-06-30 > NOTE Time and date are cleared to 2000-01-01 00:00:00 at reset. NOTE Only about 1% accuracy is obtained with the software clock.
User's Guide _______________________________________________________________________ Select Metric or Nonmetric Output Units Syntax: UNIT x Where x = M or N M = metric units N = nonmetric units Table 15 Output Quantities and their Metric and Nonmetric Units Quantity RH Relative Humidity T Temperature TDF Dewpoint/frostpoint TD Dewpoint A Absolute humidity X Mixing ratio TW Wet bulb temperature PPM Humid air volume/dry air volume PW Water vapor pressure PWS Saturation water vapor pressure H Enthalpy
Chapter 4 _________________________________________________________________ Operation Output State of Chemical Purge or Sensor Heating (with SEND and R Commands) Syntax: FST x Where x = ON/OFF (default = OFF) Example: >fst on Form. status : ON >send 1 N 0 RH= 40.1 %RH T= 24.0 'C Td= 9.7 'C Tdf= 9.7 'C a= 8.7 g/m3 x= 7.5 g/kg Tw= 15.6 'C ppm= 11980 pw= 12.00 hPa pws= 29.91 hPa h= 43.2 kJ/kg >purge Purge started, press any key to abort. >send S 134 RH= 40.2 %RH T= 24.1 'C Td= 9.8 'C Tdf= 9.8 'C a= 8.
User's Guide _______________________________________________________________________ Other Commands Check Transmitter Settings Syntax: ? Syntax: ?? Use the command ? to check the current transmitter configuration. The command ?? is similar but can also be used if the transmitter is in POLL state. Example (factory default settings): >? HMT310 / 1.07 PRB serial nr : Calibration : Cal.
Chapter 4 _________________________________________________________________ Operation All Devices in POLL Mode Send Their Addresses Syntax: FIND List Commands Syntax: HELP Set Ambient Pressure for Calculations Syntax: PRES aaaa.a Syntax: XPRES aaaa.a Where aaaa.a = Absolute pressure (hPa) The XPRES command should be used if the value is changed frequently. Its value is not retained at reset, and when set to 0, the value set with the PRES command is used.
User's Guide _______________________________________________________________________ Table 16 Pressure Conversion Chart TO hPa mbar mmHg Torr inHg atm bar psi 1 1.333224 33.86388 1013.25 1000 68.94757 0.7500617 1 25.40000 760 750.0617 51.71493 inHg 0.02952999 0.03937008 1 29.921 29.52999 2.036021 atm 0.00098692 0.00131597 0.033422 1 0.98692 0.068046 bar 0.001 0.001333224 0.03386388 1.01325 1 0.06894757 psi 0.01450377 0.01933678 14.6962 14.
Chapter 4 _________________________________________________________________ Operation Reset Transmitter Syntax: RESET This command resets the device, resulting in a short start-up delay. The serial interface mode (STOP, RUN or POLL) selected with the SMODE command is taken into use at restart. Display Error Messages Syntax: ERRS Display transmitter error messages. If there are no errors present, a PASS will be returned.
User's Guide _______________________________________________________________________ Setting, Scaling and Testing Analog Outputs Set Analog Output Mode Syntax: AMODE ch1 ch2 Where ch1 and ch2 = I0 = 0 ... 20 mA I1 = 4 ... 20 mA U1 = 0 … 5 V * U2 = 0 … 10 V * *) Voltage output applicable from software version 2.0.1 onward. Example: >amode i1 i1 Ch1 output mode: 4...20mA Ch2 output mode: 4...20mA > NOTE 1 … 5 V output can be selected when ordering the device. The 1 ...
Chapter 4 _________________________________________________________________ Operation Table 17 Output Quantities and their Metric and Nonmetric Units Quantity RH Relative Humidity T Temperature TDF Dewpoint/frostpoint TD Dewpoint A Absolute humidity X Mixing ratio TW Wet bulb temperature PPM Humid air volume/dry air volume PW Water vapor pressure PWS Saturation water vapor pressure H Enthalpy NOTE Metric Unit %RH °C °C °C 3 g/m g/kg °C ppm Nonmetric Unit %RH °F °F °F 3 gr/ft gr/lb °F ppm hPa hPa psi
User's Guide _______________________________________________________________________ Test Analog Outputs Syntax: ITEST aa.aaa bb.bbb The operation of the analog outputs is tested by forcing the outputs to given values. The values in the analog outputs can then be measured with a current/voltage meter. Where aa.aaa bb.bbb = = Current/voltage value to be set for channel 1 Current/voltage value to be set for channel 2 Example: >itest 8.30 6.40 8.30000mA 2c30 > 6.
Chapter 4 _________________________________________________________________ Operation Set Error Outputs Syntax: AERR The factory default state for analog outputs during error condition is 0 mA. Be careful when selecting the new error value, the error state of the transmitter should not cause problems in process monitoring. Example: >aerr Ch1 error out Ch2 error out : 0.000mA ? : 0.000mA ? NOTE Error output value needs to be within the valid range of the output type.
User's Guide _______________________________________________________________________ NOTE Using purge is not recommended when the transmitter is powered with USB. For information on HMT310 operating voltages, see section Power Supply Requirements on page 34.
Chapter 4 _________________________________________________________________ Operation Automatic Chemical Purge Settings Turn ON/OFF Automatic Chemical Purge This command enables or disables automatic chemical purge. Syntax: PUR x Where x = ON/OFF Example: >pur off Chemical Purge : OFF >pur on Chemical Purge : ON > Set Chemical Purge Interval If the sensor is exposed to chemicals it is recommended to have the chemical purge done at least once in 720 min (= 12 hours).
User's Guide _______________________________________________________________________ NOTE To activate the new interval setting immediately, reset the transmitter. Chemical Purge in Powerup This command enables or disables the function which turns on chemical purge within 10 seconds from the powerup of the device. Syntax: PURR x Where x = ON/OFF (default = OFF) NOTE When you enable this function, wait about 8 min after powerup before taking measurements.
Chapter 4 _________________________________________________________________ Operation The prompt ">" appears when the heating period is over. However, the transmitter outputs are locked to values measured before chemical purge until the settling time is over. Sensor Heating (Optional) General This function is optionally available only in transmitters with HUMICAP®180RC sensor. It should be used only with the warmed probe.
User's Guide _______________________________________________________________________ Setting Humidity Sensor Heating When HMT310 leaves the factory the sensor heating follows the factory default values. You can enable or disable the function, change the RH limit and define the heating temperature and duration of the heating period. Sensor Heating ON/OFF Enables or disables the sensor heating.
Chapter 4 _________________________________________________________________ Operation Example: >xheat Extra heat : Extra heat RH : Extra heat temp: Extra heat time: >xheat on Extra heat : > OFF 95 ? 90 100 ? 85 30 ? 10 ON VAISALA ________________________________________________________________________ 63
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Chapter 5 _______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of the HMT310. Periodic Maintenance Calibration Interval HMT310 is fully calibrated and adjusted as shipped from factory. Typical calibration interval is one year. In certain applications it may be advisable to do more frequent checks.
User's Guide _______________________________________________________________________ When replacing the filter, wear clean gloves to avoid depositing dirt or oil on the filter. Replace the filter as follows: 1. 2. 3. 4. Turn the filter counterclockwise until it is loose. Pull the filter straight out carefully. Do not damage the sensor. Take the new filter, and insert it to the filter thread. Tighten the new filter to 5 Nm by turning it clockwise.
Chapter 5 _______________________________________________________________ Maintenance 0508-079 Figure 17 Changing the Sensor The following numbers refer to Figure 17 above: 1 2 = = Pull out the sensor Plastic socket Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com.
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Chapter 6 ___________________________________________________ Calibration and Adjustment CHAPTER 6 CALIBRATION AND ADJUSTMENT This chapter describes the relative humidity and temperature adjustment procedures. Note that after adjustment, the original calibration certificate shipped with the product is not valid anymore. Vaisala recommends using the calibration services offered by Vaisala.
User's Guide _______________________________________________________________________ Calibration and Adjustment Commands Revert to Factory Calibration Syntax: LI This command reverts only the CRH calibration (see calibration instructions, starting on page 73). 1. 2. 3. Remove the transmitter unit from the mounting plate (see Mounting the Transmitter/Removing the Transmitter Unit on page 22) and press the adjustment button once (see Figure 18 on page 74).
Chapter 6 ___________________________________________________ Calibration and Adjustment Relative Humidity Calibration after Sensor Change Syntax: FCRH The transmitter asks and measures relative humidity and calculates the calibration coefficients. This two-point adjustment needs to be performed after a sensor change. Follow the more detailed calibration instructions on page 73, but instead of the CRH command, use the FCRH command. Example: >fcrh RH : 1.82 1.
User's Guide _______________________________________________________________________ Set Calibration Date Syntax: CDATE yyyy mm dd 1. 2. 3. Remove the transmitter unit from the mounting plate (see Mounting the Transmitter/Removing the Transmitter Unit on page 22) and press the adjustment button once (see Figure 18 on page 74). Issue the LI command and set the offset value to 0 and gain value to 1. Issue the CDATE command and set the calibration date.
Chapter 6 ___________________________________________________ Calibration and Adjustment Multipoint Relative Humidity Adjustment Syntax: MPC [quantity] [function] where quantity = function = Quantity to be adjusted. The only available quantity is RH. Desired function. The options are: ON – Enable multipoint correction. OFF – Disable multipoint correction. LIST – Show correction table. INIT – Start entering values in correction table.
User's Guide _______________________________________________________________________ 0507-048 Figure 18 NOTE Location of Adjustment Button With a warmed probe (HMT317) or sensor heating, heating is interrupted when the adjustment button is pressed. Allow enough time for the probe to reach ambient temperature and then start the calibration procedure. Low End Adjustment 1. 2. 3. 4. 5. 6.
Chapter 6 ___________________________________________________ Calibration and Adjustment High End Adjustment 7. 8. 9. After the low end adjustment, insert the probe into the measurement hole of the high end reference chamber (for example, NaCl: 75 % RH chamber in the humidity calibrator HMK15, use the adapter fitting 13.5 mm for HMT314, HMT315, HMT317, and HMT318). Note that the difference between the two humidity references must be at least 50% RH. Let the probe stabilize for at least 30 minutes.
User's Guide _______________________________________________________________________ Temperature Calibration and Adjustment (in One Point) 1. 2. 3. 4. 5. 6. Remove the transmitter unit from the mounting plate (see Mounting the Transmitter/Removing the Transmitter Unit on page 22) and press the adjustment button once (see Figure 18 on page 74). Remove the probe filter (see instructions on page 65) and insert the probe into the reference temperature. Let the sensor stabilize.
Chapter 6 ___________________________________________________ Calibration and Adjustment Humidity Calibration and Adjustment (in One Point) 1. 2. 3. 4. 5. 6. Remove the transmitter unit from the mounting plate (see Mounting the Transmitter/Removing the Transmitter Unit on page 22) and press the adjustment button once (see Figure 18 on page 74).
User's Guide _______________________________________________________________________ Multipoint Adjustment Using Serial Line You can use the MPC command (applicable from software version 2.0.1 onward) to perform a multipoint adjustment to the relative humidity measurement. Due to the linear response of the HUMICAP® sensor, it is recommended to use the standard two-point adjustments. Use multipoint correction only if: - You need to adjust the relative humidity measurement in 3 ... 8 adjustment points.
Chapter 6 ___________________________________________________ Calibration and Adjustment Example Multipoint Adjustment Procedure 1. 2. Connect the HMT310 to a computer (see section Serial Line and Analog Communication Options on page 36). Open a terminal program. Issue the PURGE command to carry out the chemical purge, and wait for six minutes for it to complete. Transmitters without the chemical purge feature (selected when ordering) do not respond to the command.
User's Guide _______________________________________________________________________ 7. 8. To start, remove the filter from the probe and insert the probe into a measurement hole of the driest reference chamber you intend to use. Proceed from low to high humidity. Remember to allow at least 30 minutes for the sensor to stabilize at each point. Once you have completed the list, remove the probe from the last measurement chamber and re-attach the filter.
Chapter 6 ___________________________________________________ Calibration and Adjustment Adjustment Using an MI70 Indicator You can use the MI70 handheld indicator to adjust the following in HMT310: - Temperature (T) - Relative humidity (RH) - Pressure compensation value for humidity measurement (environment settings) Note that starting the calibration in MI70 requires pressing the adjustment button on the HMT310 board. See Figure 18 on page 74 for the location of the adjustment button.
User's Guide _______________________________________________________________________ Adjusting RH with MI70 Selecting RH in the main adjustment menu brings up a notification about checking environment settings. Select YES to access the environment settings before performing the RH adjustment, or NO to continue to RH adjustment without changing the current environment settings. Select ADJUST to access the RH adjustment options.
Chapter 6 ___________________________________________________ Calibration and Adjustment Press view. EXIT to quit the adjustment mode and return to the basic MI70 LiCl – NaCl automatic adjustment LiCl-NaCl automatic adjustment is a two-point adjustment in reference humidities of 11.3 % (LiCl) and 75 % (NaCl). You do not have to enter the reference values, the MI70 displays the accurate value based on the measured temperature and the Greenspan table stored into the memory of the MI70.
User's Guide _______________________________________________________________________ 1-point T adjustment Select 1-point adjustment in the T adjustment menu and follow the steps below: 1. 2. 3. Set the probe to a reference temperature. You can follow the stabilization from the GRAPH display. Press READY when the reading is stabilized. Give the reference temperature by using the arrow buttons and OK. press To confirm the adjustment, press YES.
Chapter 6 ___________________________________________________ Calibration and Adjustment Environment Settings When you select RH adjustment for the first time from the adjustment main menu, MI70 asks if you want to check the environment settings (pressure compensation value for humidity measurement). If you need to access the environment settings after this, exit the adjustment mode by selecting EXIT in the main adjustment menu and navigate to the environment menu from the MI70 main menu.
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Chapter 7 _____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the HMT310. Specifications Table 19 Relative Humidity Specifications Property Measuring range Sensor Description / Value 0 ...
User's Guide _______________________________________________________________________ Table 20 Temperature Specifications and Operating Pressure Ranges Property HMT311 HMT313 80 °C HMT313 120 °C HMT314 HMT315 (vapor tight) HMT317 (vapor tight) HMT318 Accuracy at +20 °C (+68 °F) Accuracy over temperature range Temperature sensor Description / Value -40 ... +60 °C (-40 ... +140 °F) -40 ... +80 °C (-40 ... +176 °F) -40 ... +120 °C (-40 ... +248 °F) -70 ... +180 °C (-94 ... +356 °F), 0 ... 10 MPa (0 ...
Chapter 7 _____________________________________________________________ Technical Data Table 21 Electrical Connections Property Two analog outputs: selectable and scalable Description / Value Current: 0…20 mA or 4…20 mA Voltage: 0 … 5 V, or 0 … 10 V (1 ... 5 V available through scaling) Typical analog output accuracy at +20 °C ±0.05% of full scale Typical temperature dependence of 0.005%/°C (0.
User's Guide _______________________________________________________________________ Calculated Variables Table 23 Calculated Variables (Typical Ranges) Variable HMT331 Probe HMT333 Probe Dewpoint temperature Mixing ratio Absolute humidity Wet bulb temperature Enthalpy Water vapor pressure -20 ... +60 ºC 0 ... 160 g/kg dry air 3 0 ... 160 g/m 0 ... 60 ºC -40 ... +1500 kJ/kg 0 ... 1000 hPa -20 ... +80 ºC 0 ... 500 g/kg dry air 3 0 ... 500 g/m 0 ... +100 ºC -40 ... +1500 kJ/kg 0 ...
Chapter 7 _____________________________________________________________ Technical Data Accuracy of Wet Bulb Temperature °C Temp. -40 -20 0 20 40 60 80 100 120 140 160 Relative humidity 10 20 30 0.20 0.20 0.20 0.21 0.21 0.22 0.27 0.28 0.28 0.45 0.45 0.45 0.84 0.77 0.72 1.45 1.20 1.03 2.23 1.64 1.32 3.06 2.04 1.58 3.85 2.40 1.81 4.57 2.73 2.03 5.25 3.06 2.25 40 0.20 0.22 0.29 0.44 0.67 0.91 1.13 1.31 1.48 1.65 1.82 50 0.20 0.22 0.29 0.44 0.64 0.83 0.99 1.14 1.28 1.41 1.55 60 0.20 0.22 0.29 0.44 0.61 0.
User's Guide _______________________________________________________________________ Dewpoint Temperature Find the intersection of the dewpoint temperature curve and the dewpoint difference reading (process temperature-dewpoint temperature) on the xaxis and read the accuracy in dewpoint measurement on the y-axis.
Chapter 7 _____________________________________________________________ Technical Data Spare Parts and Accessories Information on spare parts, accessories, and calibration products is available online at www.vaisala.com and store.vaisala.com.
User's Guide _______________________________________________________________________ Dimensions in mm (inches) Transmitter Enclosure and Mounting Plate Dimensions 1 2 0507-049 Figure 21 Transmitter Enclosure and Mounting Plate Dimensions The following numbers refer to Figure 21 above.
Chapter 7 _____________________________________________________________ Technical Data Rain Shield Dimensions 1311-252 Figure 22 Rain Shield Dimensions (Back) 1311-253 Figure 23 Rain Shield Dimensions (Side and Outer) VAISALA ________________________________________________________________________ 95
User's Guide _______________________________________________________________________ Probe Dimensions 120 (4.72) HMT311 12 (0.
Chapter 7 _____________________________________________________________ Technical Data HMT314 0507-052 Figure 26 HMT314 Dimensions 28 (1.10) *) 75 (2.95) 41 (1.61) 13.5 (0.53 12 (0.47) HMT315 27 (1.06) 2 (0.08) 192 (7.56) 242 (9.
User's Guide _______________________________________________________________________ HMT317 0508-009 Figure 28 HMT317 Dimensions HMT318 0508-078 Figure 29 HMT318 Dimensions 98 ___________________________________________________________________ M210619EN-E
Appendix A ____________________ PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES APPENDIX A PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES This appendix describes the available probe installation kits and provides some installation examples. Duct Installation Kits (for HMT313/317/315) Duct installation kit includes a flange, a sealing ring, a supporting bar and probe attaching part for the probe and screws for attaching the flange to the duct wall.
User's Guide _______________________________________________________________________ Pressure-Tight Swagelok Installation Kits (for HMT317) RH Probe Installation 0508-032 Figure 31 Swagelok Installation Kit for RH Probe The following numbers refer to Figure 31 above: 1 2 3 4 5 = = = = = Relative humidity probe Duct connector ISO3/8" or NPT1/2" thread Swagelok connector Ferrules 100 __________________________________________________________________ M210619EN-E
Appendix A ____________________ PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES Examples of Vapor-Tight Installations with Cable Gland RH Probe Installations (for HMT313/317) 1 3 2 0508-026 Figure 32 Cable Installation with Cable Gland AGRO The following numbers refer to Figure 32 above: 1 = Nut (to be tightened to the body) 2 = Seal 3 = Body and O-ring Vaisala order code for the cable gland: HMP247CG (see section Spare Parts and Accessories on page 93).
User's Guide _______________________________________________________________________ 1 2 0508-027 Figure 33 Probe Installation with Cable Gland The following numbers refer to Figure 33 above: 1 = Cable gland AGRO 1160.20.145 (T = -40 ...
Appendix A ____________________ PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES 0507-043 Figure 34 HMT318 Ball Valve Assembly Installation The following numbers refer to Figure 34 above: 1 2 3 4 5 6 7 8 = = = = = = = = Manual press tool Handle of the ball valve Probe Process chamber or pipeline Groove on the probe indicates the upper adjustment limit Filter Ball of the ball valve Clasp nut NOTE The probe can be installed in the process through the ball valve assembly provided that the process pres
User's Guide _______________________________________________________________________ Follow the steps below to install the HMT318 probe through a ball valve assembly. After the installation, the probe should be sitting in the process chamber or pipeline as shown in Figure 34 on page 103. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. NOTE Shut down the process if the process pressure is more than 10 bars. If the pressure is lower there is no need to shut down the process. Close the ball valve.
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