USER'S GUIDE Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT120 M211244EN-B
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www.vaisala.com. © Vaisala 2013 No part of this manual may be reproduced, published or publicly displayed in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be modified, translated, adapted, sold or disclosed to a third party without prior written permission of the copyright holder.
_________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION ............................................................................ 5 About This Manual ................................................................... 5 Contents of This Manual ....................................................... 5 Version Information ............................................................... 6 Related Manuals .............................
User's Guide _______________________________________________________________________ Terminal Application Settings .............................................. 24 List of Serial Commands ....................................................... 26 Device Information and Status .............................................. 27 Show Device Information..................................................... 27 Set/Show Available Quantities ............................................
_________________________________________________________________________________ Field Checking and Adjustment Using a Calibrated Reference Probe ............................................................ 55 One-Point Adjustment Using a Calibrator ...................... 55 Two-Point Adjustment Using a Calibrator ...................... 56 LiCl-NaCl Adjustment ..................................................... 57 Temperature Field Check and Adjustment by Using a Calibrated Reference Probe ..............
User's Guide _______________________________________________________________________ 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 HMT120 Components .............................................................. 12 Opening the Transmitter Cover ................................................ 13 HMT120 Wall Mounting .
Chapter 1 _________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and HMT120 Series. About This Manual This manual provides information for installing, operating, and maintaining the Humidity and Temperature Transmitter HMT120. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, This chapter provides general notes for the manual and HMT120 Series.
User's Guide _______________________________________________________________________ Version Information Table 1 Manual Code M211244EN-B M211244EN-A Manual Revisions Description June 2013. This version. New probe options added. Installation and operating instructions updated. November 2010. First version.
Chapter 1 _________________________________________________________ General Information Safety The Humidity and Temperature Transmitter HMT120 delivered to you has been tested for safety and approved as shipped from the factory. Note the following precautions: CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction. ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits.
User's Guide _______________________________________________________________________ Regulatory Compliances Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT120 is in conformity with the provisions of the following EU directives: - EMC-Directive (2004/108/EC) Conformity is shown by compliance with the following standards: - EN 61326-1: Electrical equipment for measurement, control and laboratory use – EMC requirements – for use in industrial locations.
Chapter 2 ___________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, components and accessories of the HMT120 Series. The Vaisala range of relative humidity measurement instruments covers all the applications from ventilation to process control in demanding conditions. For more information about other Vaisala relative humidity instruments, please contact your Vaisala representative or visit www.vaisala.com.
User's Guide _______________________________________________________________________ Accessories The following accessories are optionally available: - Duct installation kit Rain shield with installation kit Rain/solar radiation shield installation kit (for pole installation) Probe mounting flange Probe mounting clamp Constant output probe (HMP1100REF, gives constant RH and T values) Fixed and Remote Probe Models The HMT120 is available either with a fixed probe directly attached to the transmitter housin
Chapter 2 ___________________________________________________________ Product Overview Constant Output Probe The constant output probe HMP110REF is a testing accessory that can be used to check the transmitter's functions and measurement signal transfer chain all the way to the control system. The constant output probe does not measure humidity and temperature; instead, it outputs constant humidity and temperature readings. The values output by the constant output probe are specified when ordering.
User's Guide _______________________________________________________________________ Transmitter Components Figure 1 below illustrates the main features of HMT120. On the left is a remote probe model without display, and on the right is a fixed probe model with the optional display. The numbers and arrows indicate the main components of the transmitters.
Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the HMT120. Opening the Transmitter Cover 1. 2. If the transmitter is not mounted already, hold it against a flat surface. Push on the cover with your thumb, and pull the bottom part of the cover towards yourself.
User's Guide _______________________________________________________________________ Mounting Wall Mounting 1. 2. Remove the transmitter cover. See section Opening the Transmitter Cover on page 13. Make sure that the HMT120 Humidity and Temperature Transmitter is correctly aligned and attach it directly to the wall with up to four screws (not included in the package).
Chapter 3 ________________________________________________________________ Installation Installation with Rain Shield The installation kit with rain shield includes a metal mounting plate and a rain shield for the transmitter. Vaisala order code: 215109. 1011-150 Figure 4 1. 2. 3. HMT120 Installation with Rain Shield Fasten the metal mounting plate to the wall or pole with screws (see Figure 4 above). Note the arrow on the mounting plate. Attach the mounting plate with the arrow pointing upwards.
User's Guide _______________________________________________________________________ Installation with Radiation Shield DTR504 with probe installation kit includes a rain/solar radiation shield DTR504 and a plastic installation support for the humidity probe. Vaisala order code: DTR504A. If you already have the DTR504 shield and need only the installation support for the probe, it is available with Vaisala order code 227777. 1. 2. 3.
Chapter 3 ________________________________________________________________ Installation Duct Installation Kit The duct installation kit includes a plastic pipe with a flange (Vaisala order code: 215619). To install the HMP110 probe with the duct installation kit, drill a hole to the duct wall, assemble the probe to the duct installation kit, slide the probe head through the hole, and attach the flange to the duct wall with four screws. See page 18 for details.
User's Guide _______________________________________________________________________ Probe Assembly with Duct Installation Kit 1 2 3 0505-177 Figure 7 Assembly of the Probe with Duct Installation Kit The following numbers refer to Figure 7 above: 1 2 3 1. 2. 3. = = = HMP110 Duct installation kit Probe cable Slide the probe cable through the duct installation kit plastic pipe. Attach the probe cable to the HMP110 Humidity Probe. Attach probe assembly to the duct.
Chapter 3 ________________________________________________________________ Installation Drill the holes for the duct installation kit as follows: 1. 2. Use a 24-mm drill bit to drill a hole to the duct wall for the humidity probe. Drill holes for the duct installation kit mounting screws around the hole in a square arrangement, 42 mm apart from each other. Use a 3.2-mm drill bit to drill the holes for the mounting screws (four ST4.2×16-C-Z DIN 7981 screws).
User's Guide _______________________________________________________________________ Probe Mounting Clamp The optional mounting clamp makes it easy to install the probe on the wall of the measurement environment. The probe can be detached for calibration simply by loosening the lower screw. You can order a single clamp (Vaisala order code 225501) or a set of 10 clamps (226067).
Chapter 3 ________________________________________________________________ Installation Connections 1 3 C A L RH T ADJ 2 + - 4 SHLD SERVICE PORT CH1CH1+ CH2CH2+ 5 1011-151 Figure 11 HMT120 Component Board The following numbers refer to Figure 11 above: 1 2 3 4 5 1. 2. 3. = = = = = Optional LCD display Adjustment buttons Indicator LEDs Service port Field wire terminals Remove the transmitter cover. See section Opening the Transmitter Cover on page 13.
User's Guide _______________________________________________________________________ NOTE If an isolated output is required with current outputs, both channels require their own power supply. CH1 is always required to be powered because CH1 is the main output, and the transmitter will not operate if only CH2 is connected. 4.
Chapter 4 _______________________________________________________________ Service Port CHAPTER 4 SERVICE PORT This chapter describes the service port of the HMT120. Using the Service Port HMT120 motherboard has an 8-pin RJ-45 connector for service use. Service port uses RS-232 signaling levels. Vaisala offers an optional USB cable (Vaisala order code 219685) for connecting the transmitter to your PC. NOTE The service port is intended for short-term use such as calibration.
User's Guide _______________________________________________________________________ 4. 5. After the driver has been installed, connect the USB service cable to a USB port on your PC. Windows will detect the new device, and use the driver automatically. The installation has reserved a COM port for the cable. Verify the port number, and the status of the cable, using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu.
Chapter 4 _______________________________________________________________ Service Port 4. 5. NOTE Check that the other serial settings are correct for your connection, and change if necessary. Flow control should be set to None unless you have a reason to change it. Click the Open button to open the connection window and start using the serial line. If PuTTY is unable to open the serial port you selected, it will show you an error message instead. If this happens, restart PuTTY and check the settings.
User's Guide _______________________________________________________________________ List of Serial Commands All commands can be issued either in uppercase or lowercase. 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. Whenever you change any of the parameters and want to store the changes permanently, use the SAVE command.
Chapter 4 _______________________________________________________________ Service Port Device Information and Status Show Device Information The ? command outputs a listing of device information. ? Example: >? Device Name SW Name SW model SW version Serial number Unit Ch1 Status Ch2 Status Probe name Probe SW Probe SW date Probe SN > : : : : : : : : : : : : HMT120 HMT120/130 HMT120 0.9.3.389 "F2220101" METRIC ON ON "HMP110" "1.01.
User's Guide _______________________________________________________________________ Set/Show Available Quantities The CALCS command shows the abbreviations of the quantities measured by HMT120. The command can also be used to select the desired quantities for measurement. Only after the quantities have been set with the CALCS command, can these quantities be selected for different outputs (see commands DSEL, ASEL, and FORM). The quantities in DSEL, ASEL, and FORM must match with CALCS.
Chapter 4 _______________________________________________________________ Service Port Set/Show Calibration Information Use the CTEXT command to show or set the calibration info field. (Calibration refers to the calibration of the HMT120's analog outputs.) CTEXT [location] where location = Freely defined text string typically indicating the calibration location Examples: >ctext Calib. info: "VAISALA HELSINKI" > >ctext "Calibration lab 2" Calib.
User's Guide _______________________________________________________________________ Show Analog Output Status The AOUT command shows the following information: - Analog out mode is the output mode for the channel, for example 0 ... 10 V. Error level is the level that the analog output is set to in case of transmitter error. Status indicates the current status of the channel. The statuses are ON: Normal measurement operation. OFF: No quantity selected for the channel using the ASEL command.
Chapter 4 _______________________________________________________________ Service Port Show System Information SYSTEM Example: >system Device Name SW Name SW model SW version Serial number > : : : : : HMT120 HMT120/130 HMT120 1.0.0.500 A1234567 Show Firmware Version VERS Example: >vers HMT120 / 0.1.0.103 > Serial Line Output Commands Start Continuous Outputting Use the R command to start the continuous outputting of measurement values as an ASCII text string to the serial line.
User's Guide _______________________________________________________________________ Stop Continuous Outputting Use the S command to stop the continuous measurement output: S Set/show Output Interval Use the INTV command to show or set the output interval of the serial line measurement messages (applies when R command or RUN mode is used). The shortest output interval is one second. This command has no effect on the operation of the analog outputs.
Chapter 4 _______________________________________________________________ Service Port Calibration Commands Serial commands that are related to calibration are described below. For the actual calibration procedures, see section Calibration and Adjustment on page 50. Calibrate Humidity Measurement Use the CRH command to perform a one-point or two-point humidity (RH) calibration. CRH When performing a one-point calibration, you need to place the probe in a single humidity reference with RH < 50%.
User's Guide _______________________________________________________________________ Restore Probe RH Factory Calibration Use the CRHCLR to restore the probe RH factory calibration. CRHCLR Example: >crhclr OK > Calibrate Temperature Measurement Use the CT command to perform a one-point or two-point temperature (T) calibration. CT When performing a one-point calibration, you need to place the probe in a single temperature reference.
Chapter 4 _______________________________________________________________ Service Port Restore Probe T Factory Calibration Use the CTCLR to restore the probe T factory calibration. CTCLR Example: >ctclr OK > Calibrate Analog Output Use the ACAL command to calibrate the analog current loop outputs. ACAL After you give this command, the CH1 analog output of the transmitter is set to the low limit (4mA). Measure the output and enter the measured value.
User's Guide _______________________________________________________________________ Configuring Serial Line Operation Set/Show Serial Line Settings Use the SERI command to show or set the serial line settings. Use the SAVE command after changing the settings to store them. The new settings will be taken into use when the transmitter is reset or powered up.
Chapter 4 _______________________________________________________________ Service Port Set/Show Serial Interface Mode Use the SMODE command to show or set the serial interface mode. Note that a separate SAVE command is not needed to store the new serial interface mode setting. SMODE [STOP/RUN] In STOP mode: outputting only when command is issued, any command can be used. In RUN mode: outputting automatically, only command S can be used.
User's Guide _______________________________________________________________________ Configuring Analog Output Set/show Analog Output Error Levels Use the AERR command to show or set the analog output error levels. AERR [level1 level2] where level1 level2 = Error levels for analog output channel Examples: >aerr Ch1 Error level Ch2 Error level > : 3.6 : 3.6 >aerr 3.85 3.86 Ch1 Error level Ch2 Error level > : 3.85 : 3.
Chapter 4 _______________________________________________________________ Service Port Examples: >asel Ch1 Quantity RH lo RH hi Ch2 Quantity T lo T hi > : : : : : : RH 0 100 T -60 100 >asel rh td Ch1 Quantity RH lo RH hi Ch2 Quantity Td lo Td hi > : : : : : : RH 0 100 TD -40 60 >asel t td 0 60 -20 60 Ch1 Quantity : T T lo : 0 T hi : 60 Ch2 Quantity : TD Td lo : -20 Td hi : 60 > >asel rh none Ch1 Quantity RH lo RH hi Ch2 Quantity > : : : : >asel none none Ch1 Quantity Ch2 Quantity > : NONE : NONE
User's Guide _______________________________________________________________________ Test Analog Outputs Use the ATEST command to test the analog outputs. The ATEST command will force the output to the given value, which can then be measured with a calibrated multimeter. ATEST command affects only the analog outputs and hence it does not disable measurement functions. ATEST without parameters will exit the test mode and let the measurement continue.
Chapter 4 _______________________________________________________________ Service Port Other Commands Set/show Displayed Quantities After you have defined the quantities with the CALCS command, use the DSEL command to show or set the displayed quantities. Number of parameters determine the display mode (ie. one or two rows). If one quantity is given, display will switch to one row mode. If two quantities are given, two-row mode is used. Valid quantities are: RH, T, TD, TDF, A, X, H, TW, PWS, and PW.
User's Guide _______________________________________________________________________ Set/show Output Formatting After you have defined the quantities with the CALCS command, use the FORM command to set the output format for SEND and R commands. FORM where format = A formatting string, which can consist of following fields: “” String constant x.y Value length modifier. x is numbers before dot and y is numbers after dot. Ux Unit field length. U…U format is also supported. Q Quantity name (e.g.
Chapter 4 _______________________________________________________________ Service Port Display Command List Use the HELP command to display a list of available commands. HELP Display Active Errors Use the ERRS command to display the currently active error codes. For troubleshooting active errors, see Table 7 on page 67. ERRS Example (no active errors): >errs No errors. > Save Changed Settings Use the SAVE command to save changed settings to the transmitter FLASH memory.
User's Guide _______________________________________________________________________ Restore Saved Settings Use the RESTORE command to restore saved settings from transmitter FLASH memory to RAM. All unsaved changes will be lost. RESTORE Example: >restore Restoring default settings...done > Reset Transmitter Use the RESET command to reset the transmitter. Upon reset or powerup, the transmitter enters the serial mode that has been set with the SMODE command.
Chapter 4 _______________________________________________________________ Service Port Set/show Output Unit Use the UNIT command for output unit selection (metric or non-metric).
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Chapter 5 _______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter provides information that is needed in basic maintenance of HMT120. Replacing the HUMICAP® Sensor Fixed and Remote Probe Models 1. 2. 3. 4. Remove the filter (plastic grid or sintered stainless steel). Remove the damaged sensor and insert a new one. Recalibrate the probe. Replace a dirty filter to ensure a maximum lifetime and a fast response for the sensor.
User's Guide _______________________________________________________________________ Removing and Fastening the Probe Fixed Probe Model Remove and replace the probe as follows: 1. Loosen the metal locking bushing by carefully turning it counter clockwise. Remove the probe from the transmitter by pulling it gently downwards. Attach the new probe to the four pin M8 panel connector at the transmitter (only one position possible). Tighten the locking bushing to the M8 panel connector by turning it clockwise.
Chapter 5 _______________________________________________________________ Maintenance Remote Probe Model 1. 2. Unscrew the small sleeve that secures the probe in place at the end of the probe cable and pull out the probe. Replace the probe and screw the small sleeve back on, securing the probe tightly in place.
User's Guide _______________________________________________________________________ Calibration and Adjustment Calibrate and adjust the HMT120 using the push-buttons on the motherboard, serial line commands (see section Calibration Commands on page 33), or with portable humidity meters HM70 or HMI41. A calibrator kit is needed for calibration against saturated salt solutions. The HMK15 Humidity Calibrator and pre-measured certified salts are available from Vaisala.
Chapter 5 _______________________________________________________________ Maintenance 30 %RH. The difference between the two temperature reference points must be at least 30 °C. NOTE In push-button calibration, the transmitter outputs are by default relative humidity in the range 0…100% RH in CH1 and temperature in the range -40 … +80 °C in CH2 regardless what the actual transmitter settings are. Outputs mean in this case both the display and analog current outputs.
User's Guide _______________________________________________________________________ NOTE If you do not wish to perform the two-point RH adjustment at this time, press the ADJ button one more time. The green indicator LED turns off and the red indicator LED begins to blink slowly (800ms cycle time) to indicate T calibration state. Now you can continue following the instructions from step 7 onwards.
Chapter 5 _______________________________________________________________ Maintenance NOTE Do not touch the adjustment buttons before the conditions have stabilized. 11. Using the - and + buttons, make the temperature gain adjustment by making sure the Iout current is correct (you have to press either or + at least once even if the value is correct). 12. Press the ADJ button one more time. The red indicator LED turns off and the transmitter returns to normal mode.
User's Guide _______________________________________________________________________ Adjustment with HM70 You can check and adjust the HMT120 relative humidity measurement with the HM70 Hand-Held Humidity and Temperature meter. A HM70connection cable is needed. Vaisala order code: 211339. There are four types of adjustments available: field checking and adjustment using a calibrated reference probe, one-point adjustment using a calibrator, two-point adjustment using a calibrator, and LiClNaCl adjustment.
Chapter 5 _______________________________________________________________ Maintenance NOTE From this point onward, the local adjustment buttons at HMT120 are disabled and adjustment is carried out using the MI70 indicator. HMT120 display and analog outputs will always follow the actual measured RH/T value when in MI70 adjustment mode. When operating the MI70, do not press the buttons too quickly or the calibration may fail. Wait for one second between each press. Press OK to start adjustment.
User's Guide _______________________________________________________________________ 0505-185 Figure 18 Example of the MI70 Adjustment Menu 11. Press READY when the reading has stabilized in the reference condition. This may take 30 minutes or more. You can follow the stabilization from the GRAPH display. 0505-186 Figure 19 Example of the MI70 Adjustment Mode Graph Display 12. Enter the correct reference value with the arrow buttons. Press OK. 13. Confirm the adjustment by pressing YES. 14.
Chapter 5 _______________________________________________________________ Maintenance 13. Remove the probe from the first reference condition and insert the probe head into the higher humidity reference condition. 14. Press READY when the reading has stabilized in the second reference condition (may take 30 minutes or more). You can follow the stabilization from the GRAPH display. 15. Enter the correct reference value in the second condition with the arrow buttons. Press OK. 16.
User's Guide _______________________________________________________________________ Temperature Field Check and Adjustment by Using a Calibrated Reference Probe Follow steps 1 to 7 on page 54 and continue as follows: NOTE 8. Check that the probes are located in equal conditions and wait until the readings are stabilized (can take 30 minutes or more). If you are close to the probes, do not breathe in their direction. 9. Press ADJUST to continue adjusting. 10. Press To same as TII/I, press SELECT.
Chapter 5 _______________________________________________________________ Maintenance Adjustment with HMI41 You can check and adjust the HMT120 relative humidity measurement with the HMI41 indicator and HMP41/45/46 probes. A HMI41connection cable is needed. Vaisala order code: 25917ZZ. There are three adjustment modes available: offset (dry point), gain (wet point), and two-point adjustment.
User's Guide _______________________________________________________________________ Connections and Selecting the Calibrator Function 1. To select the calibrator function from the HMI41, press the ON/OFF button until you can see some text on the display. Then release the ON/OFF button and within 1 ... 2 seconds, press both ENTER and MODE buttons until the following display appears: 2.
Chapter 5 _______________________________________________________________ Maintenance Offset and Gain Adjustments Offset and gain adjustments are performed in the same way (they differ only in internal calculations), so this section is valid for both methods. 4. 5. 6. Connect the 25917ZZ HMI41-connection cable to the SERVICE PORT connector on the HMT120 motherboard (see Figure 11 on page 21).
User's Guide _______________________________________________________________________ HMI41 as a Reference Meter The HMI41 humidity probe is used to show the correct humidity value (be sure that the reference probe has previously been adjusted). Connect the cable and select the appropriate adjustment method as previously explained, and continue according to the following instructions. 8. A display similar to the one below should be visible: RH 9.
Chapter 5 _______________________________________________________________ Maintenance HMI41 as a Terminal The HMI41 can also be used for visualizing and setting the transmitter's RH reading manually. 8. A display similar to the one below should be visible: RH % The numbers on the first line indicate the transmitter reading, and the numbers on the second line indicate the HMI41 probe reading. 9. Let the readings stabilize and press MODE.
User's Guide _______________________________________________________________________ Troubleshooting Table 6 presents a summary of the error messages that may appear during adjustment with the HMI41. Table 6 Common Problems During Adjustment and Their Remedies Error Message RH Probable Cause This message may appear, for example, if the difference between the reference humidities is too small (< 50 %RH). This message may appear during adjustment when the HMI41 is trying to contact the transmitter.
Chapter 5 _______________________________________________________________ Maintenance Analog Output Tests HMT120 has a built-in software function for testing the analog outputs. To test the outputs, do the following: 1. 2. Make sure the transmitter is not in adjustment mode. Press the + adjustment button (see Figure 16 on page 50). This sets the output current level to the high point of the analog output range (20mA nominal).
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Chapter 6 ____________________________________________________________ Troubleshooting CHAPTER 6 TROUBLESHOOTING This chapter describes error messages and analog output error behavior, troubleshooting for possible problems, and provides contact information for technical support. Error Codes HMT120 software includes number of different self diagnostics, such as flash and program memory checksum, probe communication status, probe checksum, operation voltage check, oscillator fault check etc.
User's Guide _______________________________________________________________________ Solving Typical Problems You can check the error message via the serial interface by using the ERRS command; see section Error Codes on page 67. In case of constant error, please contact Vaisala Technical Support.
Chapter 6 ____________________________________________________________ Troubleshooting Analog Output Error Notification If the transmitter is unable to operate due to an error, the analog outputs will be set to an error level. Default output current in error state is 3.6mA. Error current value can be changed via the serial interface by using the AERR command; see section Set/show Analog Output Error Levels on page 38.
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Chapter 7 _____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the HMT120. Table 9 Relative Humidity Measurement Specifications Property Measurement range Accuracy (including non-linearity, hysteresis, and repeatability): at 0 ... +40 °C (+32 ... +104 °F) Description / Value 0 ... 100 %RH ±1.5 %RH (0 ... 90 %RH) ±2.5 %RH (90 ... 100 %RH) at -40 ... 0 °C and +40 ... +80 °C (-40 ... +32 °F and +104...
User's Guide _______________________________________________________________________ Table 11 Operating Environment Specifications Property Operating temperature range Transmitter body, no display Transmitter body, with display HMP110 probe Storage temperature range Electromagnetic compatibility Description / Value -40 ... +60 °C (-40 ... +140 °F) -20 ... +60 °C (-4 ... +140 °F) -40 ... +80 °C (-40 ... +176 °F) -50 ... +70 °C (-58 ...
Chapter 7 _____________________________________________________________ Technical Data Options and Accessories Table 14 Options and Accessories Description HMP110 probe for HMT120 HMP110R replacement probe for HMT120 HMP110T temperature only probe for HMT120 Constant output probe Humidity sensor Probe mounting flange Probe mounting clamp, 1 piece Probe mounting clamp set, 10 pcs Sensor protection Plastic grid filter Plastic grid with membrane filter Stainless steel sintered filter Probe cable 3 m Probe c
User's Guide _______________________________________________________________________ Transmitter Dimensions 1011-158 Figure 22 Dimensions of the Fixed Probe Model in mm (inches) 74 ___________________________________________________________________ M211244EN-B
Chapter 7 _____________________________________________________________ Technical Data 1011-159 Figure 23 Dimensions of the Remote Probe Model in mm (inches) VAISALA ________________________________________________________________________ 75
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Appendix A _______________________________________________________ Calculation Formulas APPENDIX A CALCULATION FORMULAS This appendix contains the formulas used for the calculated output quantities. HMT120 transmitter receives relative humidity and temperature from the HMP110 probe. From these values dewpoint, frostpoint, absolute humidity, mixing ratio, enthalpy, wet bulb temperature, saturation vapor pressure and vapor pressure in normal pressure are calculated using the following equations.
User's Guide _______________________________________________________________________ Dewpoint Temperature The dewpoint temperature (Td) of a moist air sample is the temperature to which the sample must be cooled to reach saturation with respect to liquid water. Dewpoint temperature is calculated using: Td = Tn m −1 Pw log A [ C] (1) Pw is the water vapor pressure (see the equation below). The parameters A, m, and Tn depend on temperature according to the following table: T A 6.119866 6.
Appendix A _______________________________________________________ Calculation Formulas Mixing Ratio The mixing ratio (mass of water vapour/mass of dry gas) is calculated using: x = B× Pw p-Pw [g / kg ] (3) where: B = 621.9907 g/kg The value of B depends on the gas. 621.9907 g/kg is valid for air. Absolute Humidity Absoute humidity is defined as the mass of water vapour in a certain volume. If ideal gas behaviour is assumed the absolute humidity can be calculated using: a =C⋅ Pw (T + 273.
User's Guide _______________________________________________________________________ Saturation Vapor Pressure The saturation vapor pressure (Pws) is the equilibrium water vapor pressure in a closed chamber containing liquid water. It is a function only of temperature, and it indicates the maximum amount of water that can exist in the vapor state.
Appendix A _______________________________________________________ Calculation Formulas Water Vapor Pressure Vapor pressure refers to the vapor pressure of water in air or other gas. Water vapor has a partial pressure Pw which is part of the total pressure of the gas.
User's Guide _______________________________________________________________________ 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.
Appendix A ___________________________________________________________________ INDEX INDEX A Accessories Active Errors Display Analog Output Calibrate Configuration Analog Output Error Levels Set Show Analog Output Error Notification Analog Output Quantity and Scaling Set Show Analog Output Status Show Analog Outputs Test 10, 73 43 65 35 38 38 38 69 38 38 30 40 C Calibration Commands Calibration Information Set Show Command List Display Commands Other Component Board Components Connections Continuous Out
User's Guide _______________________________________________________________________ P Probe Mounting Clamp Probe Mounting Flange Probe RH Restore Factory Calibration Probe T Restore Factory Calibration PuTTY 20 19 34 35 24 Q Quantity Set Show available 28 28 R Radiation Shield Rain Shield Reading Output Once 16 15 32 S Safety Serial Commands Serial Interface Mode Set Show Serial Line Operation Configuration 7 26 37 37 36 Serial Line Output Commands Serial Line Settings Set Show Service Port Setting
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