USER'S GUIDE Vaisala HUMICAP® Humidity and Temperature Probe HMP155 M210912EN-C
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 2012 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____________________________________________________________________ SEND [ADDR] ................................................................30 SDELAY .........................................................................30 SERI [BAUD][PARITY][DATA][STOP] ...........................31 #......................................................................................31 SMODE ..........................................................................32 INTV .............................
________________________________________________________________________________ Serial Line Calibration ........................................................... 63 Two-Point Humidity Adjustment.......................................... 63 Two-Point Temperature Adjustment ................................... 64 Relative Humidity Adjustment after Sensor Change........... 65 FCRH ............................................................................. 65 One-Point Humidity and Temperature Adjustment ..
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 HMP155 Probe .........................................................................13 HMP155 with Additional T-probe..............................................14 HMP155 with Optional Connection Cover................................
Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and maintaining Vaisala HUMICAP® Humidity and Temperature Probe HMP155.
USER'S GUIDE____________________________________________________________________ Version Information Table 1 Manual Code M210912EN-C M210912EN-B Manual Revisions Description November 2012. This manual. Added the membrane filter option. Added information about the cable cover. Previous version. March 2009. Removed the description for the OVERICE command, updated the description of the ASEL command.
Chapter 1 ________________________________________________________ General Information Safety Vaisala HUMICAP® Humidity and Temperature Probe HMP155 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 batteries and the unit according to statutory regulations. Do not dispose of with regular household refuse.
Chapter 1 ________________________________________________________ General Information Warranty Visit our Internet pages for standard warranty terms and conditions: www.vaisala.com/warranty. Please observe that any such warranty may not be valid in case of damage due to normal wear and tear, exceptional operating conditions, negligent handling or installation, or unauthorized modifications. Please see the applicable supply contract or Conditions of Sale for details of the warranty for each product.
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Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature of the Vaisala HUMICAP® Humidity and Temperature Probe HMP155. Introduction to HMP155 The HMP155 probe provides reliable humidity and temperature measurement in a wide range of applications. Humidity measurement is based on the capacitive thin film HUMICAP® polymer sensor.
USER'S GUIDE____________________________________________________________________ Table 4 Quantities Calculated by HMP155 Quantity Abbreviation TDF Metric Unit ºC Non-Metric Unit ºF Dew point / Frost point Temperature (Td/f) Dew point Temperature (Td) Mixing ratio (x) Wetbulb temperature (Tw) TD X TW ºC g/kg ºC ºF gr/lb.
Chapter 2 __________________________________________________________ Product Overview Structure of the HMP155 0801-070 Figure 1 HMP155 Probe The numbers refer to Figure 1 above.
USER'S GUIDE____________________________________________________________________ Additional Temperature Probe Option 1206-038 Figure 2 HMP155 with Additional T-probe The active output version of HMP155 can be ordered with an additional temperature probe option, see Figure 2 above. When the additional Tprobe is in use, the relative humidity value is calculated based on the Td (dew point) value obtained from the humidity probe and the Ta value obtained from the T-probe.
Chapter 2 __________________________________________________________ Product Overview Warmed Probe Option In changing temperature conditions with high humidity, the probe temperature can lag behind the temperature of the surrounding air and this can cause a risk of condensation on the sensor. A wet probe cannot observe the actual humidity in the ambient air. If the condensed water is contaminated, the life span of the probe may shorten and the calibration may change.
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Chapter 3 _______________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information on how to install HMP155 in different situations. Installation in Radiation Shields In order to reach the maximum performance level of the HMP155 probe, Vaisala recommends installing the HMP155 in a radiation shield, for example in DTR503, in DTR13 or in a Stevenson screen. See Figure 4 below, Figure 5 on page 18 and Figure 6 on page 19.
USER'S GUIDE____________________________________________________________________ Installation in DTR503 0801-072 Figure 5 HMP155 Installed in DTR503 18 _______________________________________________________________ M210912EN-C
Chapter 3 _______________________________________________________________ Installation Installation in Stevenson Screen 0805-008 Figure 6 HMP155 with T-Probe Installed in Stevenson Screen VAISALA _______________________________________________________________________ 19
USER'S GUIDE____________________________________________________________________ 8-Pin Connector Both the passive and active versions of HMP155 come with an 8-pin M12 male connector on the bottom of the probe.
Chapter 3 _______________________________________________________________ Installation The left side of Figure 8 below shows the HMP155D block diagram. The right side shows an example of connections. For the pin layout see Figure 7 on page 20. 1205-105 Figure 8 HMP155D Block Diagram and Wiring The left side of Figure 9 below shows the HMP155A/E block diagram. The right side shows an example of connections. For the pin layout see Figure 7 on page 20.
USER'S GUIDE____________________________________________________________________ Temporary RS-485 Connection Option It is possible to have a temporary RS-485 connection also in the passive output version by powering up the probe, while simultaneously holding down the ADJ button, see Figure 13 on page 58. After the probe has restarted, pins 2 and 6 then have the RS-485 signal. For the order of the pins, see Figure 7 on page 20. The default signals are returned to the pins after the next power-up.
Chapter 4 ________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate this product. Getting Started After the Vaisala HUMICAP® Humidity and Temperature Probe HMP155 has been connected to a power supply, the serial line and the analog outputs are operational depending on product model. RS-485 Interface HMP155 supports a two-wire RS-485 communication.
USER'S GUIDE____________________________________________________________________ Serial Line Communication Connect the probe to a PC, for example, by using a USB cable (optional accessory item: 221040). Connect the USB cable to the 8-pin connector on the bottom of the probe. Before you can use the USB cable, you must install the provided USB driver on your PC, see Installing the Driver for the USB Cable on page 25. NOTE NOTE When using the USB-cable, no separate power unit is needed.
Chapter 4 ________________________________________________________________ Operation After power-up the probe (in STOP-mode) outputs the software version and the command prompt. HMP155 1.00 > In RUN mode a measurement output starts immediately after power-up. In POLL mode, the probe does not output anything after power-up, see section SMODE on page 31. Installing the Driver for the USB Cable Before taking the USB cable into use, you must install the provided USB driver on your PC.
USER'S GUIDE____________________________________________________________________ Terminal Application Settings The steps below describe how to connect to the HMP155 using the PuTTY terminal application for Windows (available for download at www.vaisala.com) and the USB serial interface: 1. 2. 3. 4. 5. 6. Connect the USB serial interface cable between your PC and the RS-485 port of the HMP155. Start the PuTTY application.
Chapter 4 ________________________________________________________________ Operation 0903-025 Figure 10 PuTTY Terminal Application VAISALA _______________________________________________________________________ 27
USER'S GUIDE____________________________________________________________________ List of Serial Commands Most of the commands listed below are relevant only in the digital output version of HMP155. These commands are marked with an * in the description column to make them easier to tell apart. The bold text in the brackets is the default setting. To issue a command, type it on your computer and press the Enter key. Table 6 Measurement Commands Command R S INTV [0 ... 255 S/MIN/H] SEND [0 ...
Chapter 4 ________________________________________________________________ Operation Table 9 Command # ACAL [0/1] CDATE CRH CT CTA FCRH CTEXT L LI Table 10 Command AMODE ASEL AERR ATEST Table 11 Command ? ?? ERRS FILT [0.
USER'S GUIDE____________________________________________________________________ Measurement Commands R Enter the R command to start the continuous output of measurements. This command starts a temporary RUN mode. To change to permanent RUN mode, use the SMODE command. Example: >r RH= 33.0 %RH T= 22.1 'C > If a value is too long to fit to the allocated space in the output, or if there is an error in outputting the quantity, the value is displayed with stars ‘*’.
Chapter 4 ________________________________________________________________ Operation Where 0 = 1 = 255 = No extra delay added 4-8 ms extra delay 1024 ms extra delay Example: >sdelay 15 Serial delay > : 15 SERI [BAUD][PARITY][DATA][STOP] To set the communication settings, use the SERI serial line command.
USER'S GUIDE____________________________________________________________________ The settings are temporary, and last only for a single session at a time. On the next connection HMP155 reverts to the settings last set with the SERI command. SMODE Use the SMODE command to set the user port to permanent STOP, RUN, POLL or SEND mode.
Chapter 4 ________________________________________________________________ Operation Formatting Commands FORM Use the serial line command FORM to change the format or select certain quantities for the output commands SEND and R. FORM [x] where x = Formatter string Formatter string consists of quantities and modifiers. You can only give a maximum of 73 characters after the command on the command line. When entering the command, use the abbreviations of the quantities.
USER'S GUIDE____________________________________________________________________ OK >send Temperature= > 24.23 >form "Twet=" 6.3 tw U3 #t "T=" t U3 #r#n OK >send Twet= 11.290'C T= 24.231'C > >form 5.1 rh #t t #t tdf #r#n OK >send 15.6 24.2 -3.1 > FORM / command returns the default output format. The default output format depends on the device configuration. FORM command without formatter string returns the current output format of the probe. >form / OK >send RH= 23.8 %RH T= 19.
Chapter 4 ________________________________________________________________ Operation UNIT [M/N] Use the UNIT command to select metric or non-metric output units. UNIT [M/N] where M = N = Metric units Non-metric units Example: >unit n Units : non metric > TIME To set or display the current time, use the TIME serial line command.
USER'S GUIDE____________________________________________________________________ Pressure Compensation Commands PRES and XPRES Use the PRES serial line command to set ambient pressure value for fixed pressure compensation. If the value is changed frequently, use the XPRES serial line command. Its value is cleared to 0.0 at reset; if it is set to other than 0, it overrides the setting given with the PRES command. NOTE In normal pressure conditions, PRES command is not needed.
Chapter 4 ________________________________________________________________ Operation System Commands The commands introduced in this section are used for setting the filtering level, checking the probe configuration, listing available commands and possible error messages, and displaying the software information of the probe. FILT [0.1…1] Use the FILT [xxx] serial line command to set the filtering level. The default setting is 1.
USER'S GUIDE____________________________________________________________________ ? Use the ? serial line command to check the current probe configuration. ?? command is similar but can also be used if the probe is in POLL mode. Example: >? HMP155 1.00 Serial number : Batch number : Module number : Sensor number : Sensor model : Cal. date : Cal.
Chapter 4 ________________________________________________________________ Operation HELP Use the HELP command to list the available commands. Example: >help ? ACAL ch0/ch1 ADDR 0...99 AERR err1 err2 AMODE ch1 ch2 ASEL quantity1 quantity2 low1 high1 low2 high2 ATEST value1 value2 CDATE 'cal.date' CLOSE CRH CT CTA CTEXT 'cal.info' ERRS FCRH FILT value FORM 'format string' HELP INTV 0...255 s/min/h L LI OPEN addr PRES bar PUR on/off R RESET S SDELAY 0...
USER'S GUIDE____________________________________________________________________ ERRS Use the ERRS command to display probe error messages, see Table 15 on page 54. Example: >errs No errors > VERS Use the VERS command to display software version information. Example: >vers HMP155 1.01 > RESET Use the RESET command to reset the device. The user port switches to start-up output mode selected with SMODE command. NOTE The RESET command returns the passive output version back to analog output mode.
Chapter 4 ________________________________________________________________ Operation Analog Output Configuration Commands The analog output(s) are set in the factory according to the order form. In case you want to change the settings, follow these instructions. NOTE The serial line commands AMODE, ASEL and ATEST cannot be used with the passive output version of HMP155. AMODE Use the serial line to select and scale the analog output quantities.
USER'S GUIDE____________________________________________________________________ ASEL Use the ASEL command to select the quantities and scaling for analog outputs of the HMP155. Note that the optional quantities can be selected only if they have been selected when ordering the device. Quantities and their abbreviations are listed in Table 3 on page 11 and Table 4 on page 12.
Chapter 4 ________________________________________________________________ Operation ATEST Use the serial line to test the operation of all the analog outputs. Use the ATEST command to force the analog outputs to entered values. The set values remain valid until you enter the ATEST command without parameters or reset the probe. Entering the ATEST command without parameters outputs the current output value.
USER'S GUIDE____________________________________________________________________ NOTE The error output value is outputted only when there are minor electrical faults such as humidity sensor damage. When there is a severe device malfunction, the error output value is not necessarily shown. ADDR Addresses are required only for POLL mode (see serial line command SMODE on page 31) and intended for multi-purpose RS485 buses. Use the ADDR command to input the RS-485 probe address.
Chapter 4 ________________________________________________________________ Operation Sensor Functions The active output version of HMP155 includes optional functions such as chemical purge and sensor heating. These functions are described in more detail in this section. Chemical Purge (Optional) In some specific applications the sensor gain may decrease gradually due to an interference caused by a particular chemical present in the measured gas, for example.
USER'S GUIDE____________________________________________________________________ 0508-035 Figure 11 Decrease of Sensor Gain Automatic Chemical Purge (Interval Purge) When HMP155 leaves the factory the automatic chemical purge takes place repeatedly with the time intervals set in the factory, if this option is chosen. You can change the interval in which the purge takes place by using serial commands.
Chapter 4 ________________________________________________________________ Operation Starting and Configuring Chemical Purge In this section, the function and use of the chemical purge option is explained. PUR With PUR command, you can enable or disable automatic and power-up chemical purge and set the interval for automatic purge. 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____________________________________________________________________ Sensor Heating This function is optionally available only in probes with HUMICAP®180RC or HUMICAP®180C composite sensors. It should be used only with the heated probe. The sensor heating is recommended for the high humidity environments where even small temperature differences can cause water to condense on the sensor. The sensor heating speeds up the recovery of the humidity sensor from condensation.
Chapter 4 ________________________________________________________________ Operation XHEAT Enables or disables the sensor heating. Example: >xheat on Extra heat >xheat off Extra heat > : ON : OFF To configure the sensor heating, use the XHEAT command without parameters. Enter the values after the question mark. The available ranges include the following: Extra heat RH -limit (heating function starts-up above the setpoint) Extra heating temperature Extra heating time 0 ... 100 %RH (default: 95 %RH) 0 ..
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Chapter 5 ______________________________________________________________ Maintenance CHAPTER 5 MAINTENANCE This chapter contains information that is needed in basic maintenance of the product. Periodic Maintenance Cleaning Clean the probe with a soft, lint-free cloth moistened with mild detergent. Changing the Probe Filter In the course of time the probe filter will be contaminated with matter that you cannot remove by cleaning.
USER'S GUIDE____________________________________________________________________ Changing the Sensor You can change the HUMICAP® sensor yourself and the probe does not have to be sent in for service for a sensor change. NOTE Both HUMICAP®180 and HUMICAP®180R sensors can be changed, but you must never replace a HUMICAP®180 sensor with a HUMICAP®180R sensor or vice versa. To change the sensor: 1. 2. 3. 4. 5. CAUTION Remove the filter from the probe.
Chapter 5 ______________________________________________________________ Maintenance 0802-159 Figure 12 Changing the HUMICAP®180/180R Sensors The following numbers refer to Figure 12 above: 1 2 3 4 = = = Filter O-ring HUMICAP® sensor Pt100 temperature sensor VAISALA _______________________________________________________________________ 53
USER'S GUIDE____________________________________________________________________ Error States In an error state, the quantity is not measured and the output is shown as follows: - Analog channel outputs 0 V (you can use the AERR serial line command to change this fault indication value, see section AERR on page 43). - The serial port outputs stars (***) instead of measured values. You can also check the error message via the serial interface by using the ERRS command.
Chapter 5 ______________________________________________________________ Maintenance Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com. Provide at least the following supporting information: - Name and model of the product in question Serial number of the product Name and location of the installation site Name and contact information of a technically competent person who can provide further information on the problem.
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Chapter 6 ___________________________________________________Calibration and Adjustment CHAPTER 6 CALIBRATION AND ADJUSTMENT The Vaisala HUMICAP® Humidity and Temperature Probe HMP155 is fully calibrated and adjusted as shipped from factory. Recommended calibration interval is one year. Depending on the application, it is good to make more frequent checks. Calibration must always be done when there is reason to believe that the device is not within the accuracy specifications.
USER'S GUIDE____________________________________________________________________ 0801-076 Figure 13 HMP155 Adjustment Buttons The following numbers refer to Figure 13 above: 1 2 3 4 5 = = = = = Protective cover (unscrewed) Down button ADJ button Up button Protective plug (lifted up) There is a two-color indicator LED located under the protective plug and next to the Down button, see Figure 13 above. The LED is green and red.
Chapter 6 ___________________________________________________Calibration and Adjustment Push-Button Calibration Calibration and adjustment of the HMP155 can be done by using the adjustment buttons found on the probe. The two-point humidity adjustment is carried out by using two relative humidity references: for example saturated salt points 11 % RH (LiCl) and 75 % RH (NaCl). The difference between the two humidity reference points must be at least 30 %RH.
USER'S GUIDE____________________________________________________________________ 7. NOTE If you do not wish to perform the temperature adjustment at this time, press ADJ -button two times and the indicator LED turns off. After reset, HMP155 exits the calibration mode. Otherwise, continue following the instructions from step 8 onwards. 8. NOTE Using the - and + buttons, make the temperature offset adjustment by making sure the Aout voltage is correct and press the ADJ button.
Chapter 6 ___________________________________________________Calibration and Adjustment One-Point Humidity and Temperature Adjustment To make a one-point humidity or temperature adjustment: 1. 2. 3. 4. 5. NOTE Do not touch the adjustment buttons before the conditions have stabilized. 6. 7. 8. NOTE Carry out the chemical purge (if available). See section Chemical Purge (Optional) on page 45. Uncover the adjustment buttons on the probe by removing the protective cover and removing the calibration seal.
USER'S GUIDE____________________________________________________________________ Passive Output Version Push-Button Calibration If you are operating a passive output version HMP155, the humidity calibration is carried out similarly to calibration of the active output version. After finishing the humidity adjustment, press the ADJ button twice until the LED turns off. Reset the probe to exit the calibration mode.
Chapter 6 ___________________________________________________Calibration and Adjustment Serial Line Calibration Two-Point Humidity Adjustment Note that the difference between the two humidity references must be at least 30 %RH. To make a humidity adjustment: 1. 2. 3. 4. 5. 6. 7. 8. Connect the HMP155 to a PC. See section Serial Line Communication on page 24. Open a terminal program. Carry out the chemical purge (if available). See section Chemical Purge (Optional) on page 45.
USER'S GUIDE____________________________________________________________________ 13. 14. 15. Enter the adjustment information (date and text) to the memory of the probe; see the commands CTEXT and CDATE. Reset the probe with the RESET command. Take the probe out of the reference conditions and replace the filter. Two-Point Temperature Adjustment NOTE In the passive output version of HMP155, the temperature cannot be calibrated.
Chapter 6 ___________________________________________________Calibration and Adjustment Relative Humidity Adjustment after Sensor Change After sensor change, carry out the procedure as described in previous sections. Just replace the CRH command with the FCRH command. FCRH Example: >fcrh RH : 25.19 Ref1 ? 11.3 Press any key when ready ... RH : 70.02 Ref2 ? 75.5 OK > The OK indicates that the calibration has been successful.
USER'S GUIDE____________________________________________________________________ User Adjustment Commands You can use the user adjustment commands to display and set parameters. You can only use LI command in ADJUST mode. These parameters are updated with the commands CRH, CT, and CTA. L With the L command you can display user adjustment parameters. Example: >l Cp Cp T T Ta Ta > offset gain offset gain offset gain : : : : : : 0.00000000E+00 1.00000000E+00 0.00000000E+00 1.00000000E+00 0.00000000E+00 1.
Chapter 6 ___________________________________________________Calibration and Adjustment commands in ADJUST mode. To put HMP155 in adjustment mode, just hold down the ADJ button until the green LED lights up. CTEXT Use the CTEXT command to enter text to the adjustment information field. Example: >ctext Cal. info > : Helsinki / FIN ? Finland CDATE Use the CDATE command to enter date to adjustment information field. Set the adjustment date in format YYYYMMDD.
USER'S GUIDE____________________________________________________________________ ACAL [0/1] Example: Ch 0: >acal 0 U1 ( V ) ? 1.001 U2 ( V ) ? 9.011 Ch 1: >acal 1 U1 ( V ) ? 2.0988 U2 ( V ) ? 8.8997 > MI70 Check and Adjustment Vaisala MI70 measurement indicator is an optional accessory that can be used as a display or as a communication device for HMP155. When it is used, HMP155 is powered via MI70. With MI70 you can check the HMP155 easily on the field.
Chapter 6 ___________________________________________________Calibration and Adjustment 4. Press OK to move on to the adjustment and select the quantity you want to adjust. The list of quantities displayed in the figure below varies according to the configuration of your HMP155. 5. Follow the instructions given on the display to finish the adjustment.
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Chapter 7 ____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the product. Performance Relative Humidity Table 16 Relative Humidity Performance Description Value Measurement range 0 ... 100 %RH Accuracy (including non-linearity, hysteresis and repeatability) at +15 ... 25 °C (59 … 77 °F) ±1% RH (0 ... 90% RH) ±1.7% RH (90 ... 100% RH) at -20 … +40 °C (-4 … 104 °F) ±(1.0 + 0.008 × reading)% RH at -40 ...
USER'S GUIDE____________________________________________________________________ Temperature Table 17 Temperature Performance Description Value Measurement range -80 ... +60 °C (-112 ... +140 ºF) Accuracy with voltage output at -80 … +20 °C ±(0.226 - 0.0028 x temperature) °C at +20 … +60 °C ±(0.055 + 0.0057 x temperature) °C Accuracy with passive (resistive) output According to IEC 751 1/3 ±(0.1 + 0.00167 x |temperature|) °C Class B Accuracy with RS-485 output (see Figure 14 below) at -80 … +20 °C ±(0.
Chapter 7 ____________________________________________________________ Technical Data Operating Environment Table 18 Operating Environment Description Operating temperature range for humidity measurement Storage temperature range Electromagnetic compatibility Value -80 ... +60 °C (-112 ... +140 °F) -80 ... +60 °C (-112 ... +140 °F) Complies with EMC standard EN61326-1, Electrical equipment for measurement control and laboratory use - EMC requirements for use in industrial locations.
USER'S GUIDE____________________________________________________________________ Calculated Variables Table 19 Calculated Variables Quantity Dew point / Frost point Temperature (Td/f) Dew point Temperature (Td) Mixing ratio (x) Wetbulb temperature (Tw) Abbreviation Metric Unit Non Metric Unit TDF ºC ºF TD X TW ºC g/kg ºC ºF gr/lbs.
Chapter 7 ____________________________________________________________ Technical Data Accuracy of Wet Bulb Temperature °C Temp. -40 -20 0 20 40 60 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 40 0.20 0.22 0.29 0.44 0.67 0.91 50 0.20 0.22 0.29 0.44 0.64 0.83 60 0.20 0.22 0.29 0.44 0.61 0.76 70 0.20 0.23 0.30 0.43 0.58 0.71 80 0.20 0.23 0.30 0.43 0.56 0.67 90 — — 0.31 0.42 0.54 0.63 100 — — 0.31 0.42 0.52 0.
USER'S GUIDE____________________________________________________________________ Table 21 Average current consumption (+15 VDC, load 100 kOhm) Description 0…1 V output 0…10 V output RS-485 During chemical purge With warmed probe Table 22 Value < 3 mA + 0.5 mA < 4 mA max. 110 mA max. 150 mA Operating Voltage and Settling Time Description Operating voltage Settling time at power-up Voltage output RS-485 Value 7 ...
Chapter 7 ____________________________________________________________ Technical Data Options and Accessories Table 24 Options and Accessories Description SENSORS HUMICAP180R HUMICAP180 HUMICAP180RC HUMICAP180C FILTERS Sintered Teflon Filter + O-ring Membrane Filter PROBE MOUNTING ACCESSORIES T-probe Installation Adapter for DTR13 T-probe Installation Adapter for DTR502 HMP155 and T-probe Installation Adapter for Stevenson Screen CONNECTION CABLES Powering USB Cable for Service MI70 Connection Cable Conn
USER'S GUIDE____________________________________________________________________ Dimensions in mm (inches) HMP155 Probe 279 [10.98] 266 [10.47] 20 [0.79] Ø12 [0.47] 40 [1.57] 86 [3.39] 24 [0.
Appendix A ______________________________________________________ Calculation Formulas APPENDIX A CALCULATION FORMULAS This Appendix contains the formulas used for the calculated output quantities. The HMP155 series probe measures relative humidity and temperature. From these values dew point and frost point, mixing ratio, wet bulb temperature, absolute humidity and enthalpy in normal pressure are calculated using the following equations: Dew point/frost point: Td / f 237.3 7.
USER'S GUIDE____________________________________________________________________ Enthalpy: h T (1.01 0.00189 x) 2.5 x (4) The water vapor saturation pressure at temperature Tpws is calculated over water and over ice by using four equations (5-8). These formulas are taken from Hyland, R.,Wexler, A.:Formulations of the Thermodynamic Properties of the Saturated Phases of H2O from 173.15 K to 473.15 K, Ashrae transactions 1983, Part 2A. pp. 500-513.
Appendix A ______________________________________________________ Calculation Formulas where: b0 b1 b2 b3 b4 ai a-1 a0 a1 a2 a3 a4 a6 = = = = = = = = = = = = = 0.13914993 * 101 -0.48640239 * 10-1 0.41764768 * 10-4 -0.14452093 * 10-7 0.65459673 * 101 Coefficients over ice -0.56745359* 104 0.63925247* 101 -0.96778430* 10-2 0.62215701* 10-6 0.20747825* 10-8 -0.94840240* 10-12 0.
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