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Vaisala HUMICAP HMP155 User Manual

Humidity and temperature probe
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USER'S GUIDE
®
Vaisala HUMICAP
Humidity and Temperature Probe
HMP155
M210912EN-B

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Summary of Contents for Vaisala HUMICAP HMP155

  • Page 1 USER'S GUIDE ® Vaisala HUMICAP Humidity and Temperature Probe HMP155 M210912EN-B...
  • Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...

  • Page 3: Table Of Contents

    ________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION................5 About This Manual ..............5 Contents of This Manual ............5 Version Information ............... 6 Related Manuals ..............6 General Safety Considerations ..........6 Feedback................7 Product Related Safety Precautions ........7 Regulatory Compliances ............
  • Page 4 Sensor Heating..............48 Setting Humidity Sensor Heating ........48 XHEAT ..............48 CHAPTER 5 MAINTENANCE....................51 Periodic Maintenance.............51 Cleaning ................51 Changing the Probe Filter ...........51 Changing the Sensor............52 Error States ................54 Technical Support ..............55 Return Instructions ..............55 Vaisala Service Centers ............56 2 ________________________________________________________________ M210912EN-B...
  • Page 5 ________________________________________________________________________________ CHAPTER 6 CALIBRATION AND ADJUSTMENT............57 Push-Button Calibration ............59 Two-Point Humidity and Temperature Adjustment ..... 59 One-Point Humidity and Temperature Adjustment ..... 61 Passive Output Version Push-Button Calibration ....62 Serial Line Calibration ............63 Two-Point Humidity Adjustment.......... 63 Two-Point Temperature Adjustment ........
  • Page 6 User's Guide ______________________________________________________________________ List of Figures Figure 1 HMP155 Probe .................13 Figure 2 HMP155 with Additional T-probe..........14 Figure 3 HMP155 with T-probe Installed in DTR13........18 Figure 4 HMP155 Installed in DTR503 ...........19 Figure 5 HMP155 with T-Probe Installed in Stevenson Screen .....20 Figure 6 Wiring of HMP155 8-Pin Connector .........21 Figure 7...

  • Page 7: 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. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the Humidity and Temperature Probe HMP155.

  • Page 8: Version Information

    Table 2 Related Manuals Manual Code Manual Name ® M210913EN-A Vaisala HUMICAP Humidity and Temperature Probe HMP155 Quick Reference Guide General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: Warning alerts you to a serious hazard. If you do not read and follow...

  • Page 9: Feedback

    Chapter 1 ________________________________________________________ General Information Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by e-mail: manuals@vaisala.com...

  • Page 10: Recycling

    United States and/or other countries. License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.

  • Page 11: Warranty

    Products should Vaisala so require, be sent to the works supplied hereunder, which obligations of Vaisala or to such other place as Vaisala may liabilities are hereby expressly cancelled and indicate in writing, freight and insurance waived. Vaisala's liability...
  • Page 12 User's Guide ______________________________________________________________________ This page intentionally left blank. 10 __________________________________________________________________ M210912EN-B...

  • Page 13: Chapter 2 Product Overview

    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.

  • Page 14: Basic Features And Options

    User's Guide ______________________________________________________________________ Table 4 Calculated Quantities Measured by HMP155 Quantity Abbreviation Metric Non Metric Unit Unit Dewpoint / Frostpoint ºC ºF Temperature (T Dewpoint Temperature (T ºC ºF Mixing ratio (x) g/kg gr/lb Wetbulb temperature (T ºC ºF Basic Features and Options - Can be used to replace HMP45A/D, also in radiation shields ®...

  • Page 15: Structure Of The Hmp155

    Chapter 2 __________________________________________________________ Product Overview Structure of the HMP155 0801-070 Figure 1 HMP155 Probe The numbers refer to Figure 1 above. Filter Protective cover 8-Pin connector (M12) VAISALA _______________________________________________________________________ 13...

  • Page 16: Additional Temperature Probe Option

    User's Guide ______________________________________________________________________ 0801-080 Figure 2 HMP155 with Additional T-probe Additional Temperature Probe Option The active output version of HMP155 can be ordered with an additional temperature probe option, see Figure 2 above. When the additional T-probe is in use, the relative humidity value is calculated based on the T (dewpoint) value obtained from the humidity probe and the T...

  • Page 17: Warmed Probe Option

    The HMP155 warmed probe is heated continuously so that its temperature is always higher than that of the environment. This prevents condensation on the probe. VAISALA _______________________________________________________________________ 15...
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  • Page 19: Chapter 3 Installation

    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 3 on page 18, Figure 4 on page 19 and Figure 5 on page...

  • Page 20: Installation In Dtr13

    User's Guide ______________________________________________________________________ Installation in DTR13 0801-071 Figure 3 HMP155 with T-probe Installed in DTR13 18 __________________________________________________________________ M210912EN-B...

  • Page 21: Installation In Dtr503

    Chapter 3 _______________________________________________________________ Installation Installation in DTR503 0801-072 Figure 4 HMP155 Installed in DTR503 VAISALA _______________________________________________________________________ 19...

  • Page 22: Installation In Stevenson Screen

    User's Guide ______________________________________________________________________ Installation in Stevenson Screen 0805-008 Figure 5 HMP155 with T-Probe Installed in Stevenson Screen 20 __________________________________________________________________ M210912EN-B...

  • Page 23: 8-Pin Connector

    GND (red) SHIELD (black) The pins of the connector for HMP155 active output version in Figure 6 are (open end wire colors in brackets): 1 (white) RS-485-B (brown) (green) 2 (yellow) RS-485-A (pink) (blue) GND (red) SHIELD (black) VAISALA _______________________________________________________________________ 21...

  • Page 24: Temporary Rs-485 Connection Option

    User's Guide ______________________________________________________________________ The last entry in the list of pins, SHIELD, is not a pin but one of the conductors in the connection cable.The SHIELD wire color is black. 0802-039 Figure 7 Pins Connected to Pt100 (passive output version) Temporary RS-485 Connection Option It is possible to have a temporary RS-485 connection also in the...

  • Page 25: 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. RS-485 Interface HMP155 supports a two-wire RS-485 communication.

  • Page 26: Serial Line 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 24.

  • Page 27: Installing The Driver For The Usb Cable

    COM port. There is no reason to uninstall the driver for normal use. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver from the Add or Remove Programs (Programs and Features in Windows Vista) in the Windows Control Panel.

  • Page 28: Terminal Application Settings

    COM port is selected in the Serial line to connect to field. You can check which port the USB cable is using with the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu. Check that the other serial settings are correct for your connection, and change if necessary.

  • Page 29: Figure 8 Putty Terminal Application

    Chapter 4 ________________________________________________________________ Operation 0903-025 Figure 8 PuTTY Terminal Application VAISALA _______________________________________________________________________ 27...

  • Page 30: List Of Serial Commands

    User's Guide ______________________________________________________________________ List of Serial Commands Most of the commands listed below can only be used in active 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.

  • Page 31: Table 9 Calibration And Adjustment Commands

    Set the result filtering HELP Lists the available commands PRES [hPa] Set the value for pressure compensations RESET Resets the probe. VERS Display the software version information XHEAT Sensor heating * XPRES [bar] Set the value for pressure compensations, temporarily VAISALA _______________________________________________________________________ 29...

  • Page 32: Getting Measurement Message From Serial Line

    User's Guide ______________________________________________________________________ Getting Measurement Message from Serial Line 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 >...

  • Page 33: Sdelay

    Formatter string consists of quantities and modifiers. When entering the command, use the abbreviations of the quantities. For more information on quantities, see Table 3 and Table 4 on page The modifiers are presented in Table 12 on page 32. VAISALA _______________________________________________________________________ 31...

  • Page 34: Table 12 Form Command Modifiers

    User's Guide ______________________________________________________________________ Table 12 FORM Command Modifiers Modifier Description quantity Quantity name (for example RH, T or TDF) Length modifier (number of digits and decimal places) Tabulator Carriage-return Line feed “" String constant #xxx Special character with decimal code "xxx" Unit field and length ADDR Transmitter address with two characters [00...99]...

  • Page 35: Unit [M/N]

    In normal pressure conditions, PRES command is not needed. But if NOTE mixing ratio is used in high altitudes, the pressure changes will increase the mixing ratio. Use the serial line and do the following: PRES [a.aaaa] where a.aaaa = Ambient pressure value (bar) VAISALA _______________________________________________________________________ 33...

  • Page 36: Time

    User's Guide ______________________________________________________________________ Example: >pres Pressure : 1.013 bar ? > XPRES [a.aaaa] where a.aaaa = Ambient pressure value (bar) Example: >xpres Pressure: 0.000 bar > Time To set or display the current time, use the TIME serial line command. TIME [HH MM SS] Example: >...

  • Page 37: Serial Settings

    Baud P D S : 4800 E 7 1 > SMODE Use the SMODE command to set the user port to permanent STOP, RUN, POLL or SEND mode. SMODE [xxxx] where xxxx = STOP, RUN, POLL or SEND VAISALA _______________________________________________________________________ 35...

  • Page 38: Intv

    User's Guide ______________________________________________________________________ Example: >smode Serial mode : STOP ? POLL > Table 13 Selection of Output Modes Mode Output Available Commands STOP Only with the SEND command All (default mode) Automatic output Only command S POLL Only with the SEND [addr] Use with RS-485 buses command Selected output mode will be activated after power outages.

  • Page 39: Data Filtering

    0.1…1 where 1.0 = no filter and 0.1 = about 16 moving average Example: >filt Filter : 0.800 ? > 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. VAISALA _______________________________________________________________________ 37...
  • Page 40 User's Guide ______________________________________________________________________ Example: >? HMP155 1.00 Serial number : C1230001 Batch number : B2350090 Module number : C4840248 Sensor number : B4250001 Sensor model : Humicap 180 Cal. date : YYYYMMDD Cal. info : NONE Time : 00:01:06 Serial mode STOP Baud P D S 4800 E 7 1...

  • Page 41: Help

    FILT value FORM 'format string' HELP INTV 0...255 s/min/h OPEN addr PRES bar PUR on/off RESET SDELAY 0...255 SEND addr SERI baud p d s SMODE stop/run/poll TIME hh:mm:ss UNIT m/n VERS XHEAT on/off XPRES bar > VAISALA _______________________________________________________________________ 39...

  • Page 42: Errs

    User's Guide ______________________________________________________________________ ERRS Use the ERRS command to display probe error messages, see Table 14 on page 54. Example: >errs No errors > VERS Use the VERS command to display software version information. Example: >vers HMP155 1.01 > Resetting Transmitter Using Serial Line RESET Use the RESET command to reset the device.

  • Page 43: Formatting Analog Output

    >amode 3 3 Ch0 : 0 ... 1V Ch1 : 0 ... 1V > NOTE If you scale the analog output quantities with AMODE command, you must continue by entering the ACAL command, see ACAL on page 68. VAISALA _______________________________________________________________________ 41...

  • Page 44: Asel

    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.

  • Page 45: Atest

    Use the AERR serial line command to set or view the error output from analog outputs. AERR [CH0ERR/CH1ERR] where CH0ERR = Analog output CH1ERR = Analog output Example: >aerr Ch0 error out : 10.000V ? 0 Ch1 error out : 1.000V ? 0 > VAISALA _______________________________________________________________________ 43...

  • Page 46: Addr

    User's Guide ______________________________________________________________________ NOTE The error output value must be within a valid range of the output mode. NOTE The error output value is displayed 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.

  • Page 47: Close

    The purge function starts with heating stage, continues with settling and when the temperature of the sensor is decreased, the probe returns to normal mode. The whole cycle takes about 6 minutes. NOTE Chemical purge function locks the output values for about 6 minutes. VAISALA _______________________________________________________________________ 45...

  • Page 48: Automatic Chemical Purge (Interval Purge)

    User's Guide ______________________________________________________________________ 0508-035 Figure 9 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.

  • Page 49: Starting And Configuring Chemical Purge

    To activate the new interval settings immediately, reset the probe. NOTE When chemical purge in power-up is enabled, wait about 6 min after power-up before taking measurements. The output channels are locked for the first operation minutes to the initial measured values. VAISALA _______________________________________________________________________ 47...

  • Page 50: Sensor Heating

    User's Guide ______________________________________________________________________ Sensor Heating This function is optionally available only in probes with ® HUMICAP sensor. It should be used only with the heated 180RC probe. The sensor heating is recommended for the high humidity environments where even small temperature differences can cause water to condense on the sensor.
  • Page 51 To see the current values, use the XHEAT * command. Example: >xheat * Extra heat RH limit 95 %RH Temperature 100 'C Duration > NOTE After the defined XHEAT duration, there is an additional cooling time of 10 seconds before outputs are updated. VAISALA _______________________________________________________________________ 49...
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  • Page 53: Chapter 5 Maintenance

    After removing the filter, check the O-ring and change it if necessary. See Figure 10 on page 53. Install a new filter on the probe. New filters can be ordered from Vaisala, see section Options and Accessories on page 76. VAISALA _______________________________________________________________________ 51...

  • Page 54: Changing The Sensor

    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. ® ® Both HUMICAP 180 and HUMICAP 180R sensors can be changed, NOTE ®...

  • Page 55: Figure 10 Changing The Sensor

    Chapter 5 ______________________________________________________________ Maintenance 0802-159 Figure 10 Changing the Sensor The following numbers refer to Figure 10 above: Filter O-ring ® HUMICAP sensor Pt100 temperature sensor VAISALA _______________________________________________________________________ 53...

  • Page 56: Error States

    - The serial port outputs stars (***) You can also check the error message via the serial interface by using the ERRS command. In case of constant error, please contact Vaisala, see Vaisala Service Centers on page 56. Sometimes it is possible that the transmitter is not responding after startup due to an error.

  • Page 57: Technical Support

    Include the information specified in step 2 in the box with the faulty product. Also include a detailed return address. Ship the box to the address specified by your Vaisala contact. VAISALA _______________________________________________________________________ 55...

  • Page 58: Vaisala Service Centers

    User's Guide ______________________________________________________________________ Vaisala Service Centers Vaisala Service Centers perform calibrations and adjustments as well as repair and spare part services. See contact information below. Vaisala Service Centers also offer accredited calibrations, maintenance contracts, and a calibration reminder program. Do not hesitate to contact them to get further information.

  • Page 59: Calibration And Adjustment

    NOTE Vaisala recommends that RH adjustment is carried out as a two-point adjustment. With one-point adjustment, the required accuracy can only be achieved if the actual measurement environment (RH and T) is the same as the one-point adjustment environment.

  • Page 60: Figure 11 Hmp155 Adjustment Buttons

    User's Guide ______________________________________________________________________ NOTE Button calibration is not available for the additional temperature probe. In the passive output version of HMP155, the temperature cannot be calibrated. 0801-076 Figure 11 HMP155 Adjustment Buttons The following numbers refer to Figure 11 above: Protective cover Down button ADJ button...

  • Page 61: Push-Button Calibration

    , □ and +. There is also a two-coloured indicator LED. See Figure 11 on page 58. Press the ADJ button and hold it down until the green indicator LED lights up. This puts HMP155 in RH calibration mode. VAISALA _______________________________________________________________________ 59...
  • Page 62 User's Guide ______________________________________________________________________ Remove the filter and insert the probe into a measurement hole of the dry end reference chamber (for example, LiCl: 11 % RH) to do the low humidity offset adjustment. NOTE Do not touch the adjustment buttons before the conditions have stabilized.

  • Page 63: One-Point Humidity And Temperature Adjustment

    Do not touch the adjustment buttons before the conditions have NOTE stabilized. Using the - and + buttons, make sure the A voltage is correct and press the ADJ button. Green indicator LED turns off and back on. VAISALA _______________________________________________________________________ 61...

  • Page 64: Passive Output Version Push-Button Calibration

    User's Guide ______________________________________________________________________ To move on to the temperature adjustment, press the ADJ button once and the red indicator LED lights up. Insert the probe into the reference temperature. Do not touch the adjustment buttons before the conditions have NOTE stabilized.

  • Page 65: Serial Line Calibration

    Let the probe stabilize for about 30 minutes. You can follow the stabilization by pressing ENTER. When stabilized, type the high end reference value after the question mark and press ENTER. 75.45 Ref2 ? 75.57 Ref2 ? 75.55 Ref2 ? 75.59 Ref2 ? 75.5 VAISALA _______________________________________________________________________ 63...

  • Page 66: Two-Point Temperature Adjustment

    User's Guide ______________________________________________________________________ OK indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored. Enter the adjustment information (date and text) to the memory of the transmitter; 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.

  • Page 67: Relative Humidity Adjustment After Sensor Change

    - CRH and FCRH commands for humidity adjustment - CT and CTA commands for temperature adjustment To make an adjustment, just enter the command , press space bar and then enter the reference value, as in the example below. Example: Crh 20.0 VAISALA _______________________________________________________________________ 65...

  • Page 68: User Adjustment Commands

    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. With the L command you can display user adjustment parameters. Example: >l Cp offset : 0.00000000E+00 Cp gain 1.00000000E+00...

  • Page 69: Feeding Adjustment Information

    - Voltage output: 10 % and 90 % of the range Connect HMP155 to a calibrated voltage meter in order to measure voltage. NOTE Hold down the ADJ button until a green LED lights up. This puts the HMP155 in ADJUST mode. VAISALA _______________________________________________________________________ 67...

  • Page 70: Acal [0/1]

    ) ? 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. Both the active output version and the passive output version (only RH displayed) can be checked with MI70.
  • Page 71 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 vary according to the configuration of your HMP155. Follow the instructions given on the display to finish the adjustment. VAISALA _______________________________________________________________________ 69...
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  • Page 73: Chapter 7 Technical Data

    ® HUMICAP 180RC for applications with chemical purge and/or warmed probe ® Response time for HUMICAP 180R(C) at 20 °C in still air with sintered PTFE filter 63 % 20 s 90 % 60 s VAISALA _______________________________________________________________________ 71...

  • Page 74: Temperature

    User's Guide ______________________________________________________________________ Temperature 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 Class B...

  • Page 75: Calculated Variables

    0.10 0.10 0.11 0.11 0.12 0.13 0.13 0.31 0.33 0.35 0.37 0.39 0.41 0.43 0.45 0.47 0.49 0.97 1.03 1.10 1.17 1.24 1.31 1.38 1.46 1.54 1.62 2.68 2.91 3.16 3.43 3.72 4.04 4.38 4.75 5.15 5.58 VAISALA _______________________________________________________________________ 73...

  • Page 76: Accuracy Of Wet Bulb Temperature °C

    User's Guide ______________________________________________________________________ Accuracy of Wet Bulb Temperature °C Relative humidity Temp. 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 — — 0.21 0.21 0.22 0.22 0.22 0.22 0.23 0.23 — — 0.27 0.28 0.28 0.29 0.29 0.29 0.30 0.30 0.31 0.31 0.45 0.45...

  • Page 77: Inputs And Outputs

    Stainless steel (AISI 316L) Service cables USB connection cable 1.45 m (Item 221040) MI70 connection cable (Item 221801) Filter Sintered PTFE Housing material Housing classification IP66 Weight Probe 86 g 3.5 m cable 159 g 30 m cable 1260 g VAISALA _______________________________________________________________________ 75...

  • Page 78: Options And Accessories

    User's Guide ______________________________________________________________________ Options and Accessories Table 16 Options and Accessories Description Item code SENSORS HUMICAP180R HUMICAP180R HUMICAP180 HUMICAP180 FILTERS Sintered Teflon Filter + O-ring 219452SP TRANSMITTER MOUNTING ACCESSORIES T-probe Installation Adapter for 221069 DTR13 T-probe Installation Adapter for 221072 DTR502 HMP155 and T-probe Installation 221321...

  • Page 79: Dimensions In Mm (Inches)

    Chapter 7 ____________________________________________________________ Technical Data Dimensions in mm (inches) HMP155 Probe [10.98] 266 [10.47] Ø12 [0.47] 20 [0.79] 86 [3.39] 24 [0.94] 0801-077 Figure 14 Probe Dimensions Additional Temperature Probe 0801-078 Figure 15 Additional Temperature Probe Dimensions VAISALA _______________________________________________________________________ 77...
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  • Page 81: Appendix Acalculation Formulas

    ⎞ ⎜ ⎟ ⎜ ⎟ − ⎜ ⎟ ⎛ ⎞ ⎜ ⎜ ⎟ ⎟ ⎜ ⎟ ⎝ ⎠ ⎝ ⎠ 1078 is the water vapor pressure. Dewpoint/frostpoint is measured in Kelvin. Mixing ratio: × Absolute humidity: × VAISALA _______________________________________________________________________ 79...
  • Page 82 User's Guide ______________________________________________________________________ where 216.679 Enthalpy: ⋅ ⋅ ⋅ . 1 ( 00189 The water vapor saturation pressure at temperature T 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.
  • Page 83 0.20747825* 10 -8 a 3 = -0.94840240* 10 -12 a 4 = 0.41635019* 10 1 a 6 = The water vapor pressure is calculated using: ⋅ Parts per million by volume is calculated using: ⋅ (10) − VAISALA _______________________________________________________________________ 81...
  • Page 84 User's Guide ______________________________________________________________________ Symbols: dewpoint temperature (°C) water vapor pressure (hPa) water vapor saturation pressure (hPa) RH = relative humidity (%) mixing ratio (g/kg) atmospheric pressure (hPa) absolute humidity (g/m3) temperature (K) enthalpy (kJ/kg) Θ = virtual temperature 82 __________________________________________________________________ M210912EN-B...
  • Page 86 www.vaisala.com...

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