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4. Operation

4.1 RS-485 interface

HMP155 supports a 2-wire RS-485 communication. The RS-485 interface is non-isolated and
offers a maximum communication rate of 19200 bits/s. There is no internal termination for the
RS-485. If any termination is needed, terminate the bus at both ends. The recommended
termination is R termination with 120 Ω resistors.

Typically, termination resistors are only needed when the fastest communications rate
(19200 bit/s) is used for longer distances. If you use resistors, take into account the possible
increase in the current consumption.

4.2 Serial line communication

Connect a USB cable (221040) to the 8-pin connector on the bottom of HMP155. You do not
need a separate power unit, the probe is powered through the USB port.

Before using the USB cable, you must install the USB driver on your PC, see

Installing driver for USB cable (page 37)

.

Depending on your computer and the environmental conditions, heating and
purge functions may not work properly with the USB cable due to limited USB
powering capability.

HMP155 does not echo typed characters back to the terminal screen. To see the commands

you type, enable the local echo setting in the terminal program.

When HMP155 is sending out data, it cannot receive a new command. Wait until HMP155

completes the response before typing the next command.

In the RUN mode, the sensor may send the measurement data message while you
are typing the 

S

 command to stop the sending. You may need to repeat the 

S

command. Note this when designing how computer programs access HMP155.
You can use the 

Esc

 button on your keyboard to stop the sending.

Table 14 Default serial communication settings

Parameter

Value

Bauds

4800

Parity

Even

HMP155 User Guide

M210912EN-D

36

Summary of Contents for HUMICAP HMP155

Page 1: ...M210912EN D User Guide Vaisala HUMICAP Humidity and Temperature Probe HMP155 ...

Page 2: ... change without prior notice Local rules and regulations may vary and they shall take precedence over the information contained in this document Vaisala makes no representations on this document s compliance with the local rules and regulations applicable at any given time and hereby disclaims any and all responsibilities related thereto This document does not create any legally binding obligation...

Page 3: ...8 2 6 1 ESD protection 19 2 7 Regulatory compliances 19 3 Installation 20 3 1 Mounting in radiation shields 20 3 1 1 Mounting HMP155 and DTR13 on horizontal sensor support arm 20 3 1 2 Mounting HMP155 inside radiation shield DTR503A 24 3 1 3 Installation in Stevenson screen 30 3 2 Installing HMP155 31 3 3 Wiring HMP155 32 3 3 1 8 pin connector 32 3 3 2 Temporary RS 485 connection option 35 4 Opera...

Page 4: ...and 58 4 10 3 FILT command 59 4 10 4 HELP command 59 4 10 5 VERS command 60 4 10 6 RESET command 61 5 Maintenance 62 5 1 HMP155 maintenance 62 5 1 1 Cleaning 62 5 1 2 Changing HMP155 probe filter 62 5 1 3 Changing HUMICAP sensor 63 5 2 Errors 65 6 Calibration and adjustment 66 6 1 Overview 66 6 2 Push button calibration 67 6 2 1 Performing two point humidity and temperature adjustment 68 6 2 2 Per...

Page 5: ...l specifications 82 7 3 Accuracy of calculated variables 82 7 3 1 Accuracy of dew point temperature C 83 7 3 2 Accuracy of mixing ratio g kg ambient pressure 1013 mbar 83 7 3 3 Accuracy of wet bulb temperature C 83 7 3 4 Accuracy of dewpoint measurement 84 7 4 Inputs and outputs 84 7 5 Mechanical specifications 85 7 6 Options and accessories 85 7 7 Dimensions 87 7 7 1 HMP155 dimensions 87 7 7 2 Ad...

Page 6: ...d in Stevenson screen 31 Figure 8 Wiring of HMP155 8 pin connector 33 Figure 9 HMP155D block diagram and wiring 34 Figure 10 HMP155A E block diagram and wiring 35 Figure 11 Changing INTERCAP HUMICAP180R HUMICAPR2 sensors 64 Figure 12 HMP155 adjustment buttons 67 Figure 13 HMP155 accuracy over temperature range voltage and RS 485 81 Figure 14 Accuracy of dewpoint measurement 84 Figure 15 Dimensions...

Page 7: ... Table 19 Analog output commands 41 Table 20 Other commands 41 Table 21 Output modes 43 Table 22 Quantities measured by HMP155 47 Table 23 Quantities calculated from measured quantities 47 Table 24 FORM command modifiers 47 Table 25 Symbols in FORM checksum equations 49 Table 26 Analog output modes 53 Table 27 Quantities measured by HMP155 54 Table 28 Quantities calculated from measured quantities...

Page 8: ...HMP155 User Guide M210912EN D 6 ...

Page 9: ...formation about the cable cover 1 2 Related manuals Table 2 Related manuals Document code Name M210913EN Vaisala HUMICAPâ Humidity and Temperature Probe HMP155 Quick Reference Guide 1 3 Documentation conventions Warning alerts you to a serious hazard If you do not read and follow instructions carefully at this point there is a risk of injury or even death WARNING Caution warns you of a potential h...

Page 10: ...d States and other countries All other product or company names that may be mentioned in this publication are trade names trademarks or registered trademarks of their respective owners 1 5 Patent notice Vaisala HUMICAPâ Humidity and Temperature Probe HMP155 is protected by the following patents and patent applications and their corresponding national rights Finnish patent 98861 French patent 66503...

Page 11: ...le protecting the sensor from solar radiation and precipitation The shield provides ventilation while blocking both direct and reflected solar radiation 2 1 1 HMP155 models There are 3 HMP155 models A D and E Active output models Model A has 2 analog voltage outputs Model E has RS 485 digital output Passive output model Model D has a 4 wire temperature measurement passive and an analog voltage out...

Page 12: ...durability and short response time HUMICAP180C Composite 1 general purpose humidity sensor with good humidity durability and short response time The item contains humidity and temperature sensors Used for chemical purge and heated probe options HUMICAP180R Robust general purpose humidity sensor with high humidity durability good long term stability and good tolerance against chemical exposure HUMI...

Page 13: ...20 40 C 80 60 C Table 7 Models and available features Feature HMP155A HMP155D HMP155E Warmed probe Chemical purge Extra sensor heating Additional T probe Table 8 Heating options Option Description Heating options Chemical purge option for applications where interfering chemicals in the measuring environment pose a risk active output version Warmed probe for improved performance in constant high hu...

Page 14: ...or heating Xheat option page 16 2 1 3 1 Retrofit HMP45 installations HMP155 replaces HMP45 HMP155A replaces HMP45A HMP155D replaces HMP45D HMP155 offers the followings features not included in HMP45 HUMICAP180R and HUMICAPR2 humidity sensors that tolerate chemicals and improve stability Alternative humidity variables dewpoint frostpoint temperature wet bulb temperature mixing ratio Several voltage...

Page 15: ... humidity sensor regularly for example by heating to 180 C for 6 min every 0 5 10 days user configurable Heats the humidity sensor chip to 100 C 212 F for 30 s if the sensor humidity is 95 RH user configurable Benefits Accurate measurement in high humidity climate by avoiding condensation on the probe Reduced drift by removing chemical vapors from the sensor polymer Rapidly drying water vapor or d...

Page 16: ...atures with high humidity the probe temperature can lag behind the temperature of the surrounding air causing 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 change The temperature of a warmed probe is always higher than that of the environment Th...

Page 17: ...uently the sensor gain decreases In chemical purge heating the humidity sensor to approximately 180 C 356 F for several minutes evaporates the interfering chemical You can set chemical purge startup purge to start within 10 seconds from HMP155 startup The purge has a heating phase and a cooling phase After the purge cycle of 6 minutes the sensor returns to normal mode Chemical purge function locks...

Page 18: ...emical purge by turning the startup purge on temporarily and resetting the probe After the operation to turn off the startup purge use the PUR command Before starting calibration make sure that the sensor temperature has reached normal temperature More information Overview page 66 PUR command page 50 2 3 3 Extra sensor heating Xheat option You can define the humidity sensor heating temperature and...

Page 19: ...ional temperature measurements with the additional T probe if you have a heated HMP155 The additional T probe fulfils requirements of meteorological applications The response time is faster in temperature measurement and it fulfils WMO requirement of 20 second time constant When the additional T probe is in use the relative humidity value is calculated based on the Td dew point value from the humi...

Page 20: ...dditional T probe in the place where you need the reading from You can calibrate the additional temperature probe in a liquid bath 2 5 Connection cover option Figure 4 HMP155 with optional connection cover An optional connection cover is available for enhanced protection in wet environments such as coasts or rainforests 2 6 Safety This product has been tested for safety Note the following precauti...

Page 21: ...quipment chassis with a wrist strap and a resistive connection cord If you are unable to take either precaution touch a conductive part of the equipment chassis with your other hand before touching ESD sensitive components Hold component boards by the edges and avoid touching component contacts 2 7 Regulatory compliances Vaisala HUMICAP Humidity and Temperature Probe HMP155 is in conformity with t...

Page 22: ...or additional temperature probe of HMP155 Small 9 plate radiation shield Additional T sensor adapter 221072 required DTR503 For HMP155 without additional temperature probe Compact 12 plate shield Stevenson screen Adapter for Stevenson screen adapter 221321 More information Mounting HMP155 and DTR13 on horizontal sensor support arm page 20 Installation in Stevenson screen page 30 3 1 1 Mounting HMP...

Page 23: ...ccessories 1 Radiation shield DTR13 2 Sensor support arm 212564 3 Flat washer A5 3 DIN125 2 pcs 4 Spring washer B5 DIN127 2 pcs 5 Hex screw M5 16 DIN912 2 pcs 6 HMP155 7 T probe adapter 221069 optional 8 Additional T probe optional Chapter 3 Installation 21 ...

Page 24: ...d on the sensor support arm Tightening torque 5 Nm 1 2 3 4 5 1 Radiation shield 2 Sensor support arm 3 Flat washer A5 3 DIN125 2 pcs 4 Spring washer B5 DIN127 2 pcs 5 Hex screw M5 16 DIN912 2 pcs HMP155 User Guide M210912EN D 22 ...

Page 25: ... connector cover and attach the cable to the probe 4 Loosen the screw of the sensor clamp with your fingers and insert the HMP155 probe in the larger outer hole at the bottom of the radiation shield 1 2 1 Hole for additional T probe 2 Hole for HMP155 probe Chapter 3 Installation 23 ...

Page 26: ...ert the adapter into the smaller outer hole in DTR13 6 Push the connector cover over the probe connector 7 Tighten the screw without using excessive force 8 Lead the sensor cable along the sensor support and attach the cable to the sensor support with cable ties Connect the sensor cable to the M12 connector in HMP155 3 1 2 Mounting HMP155 inside radiation shield DTR503A 3 mm 4 mm and 5 mm Allen ke...

Page 27: ...r support Ø 30 mm 1 18 in or 60 mm 2 36 in 5 U bolt 6 Hex screw M4 10 DIN912 2 pcs Tightening torque 5 Nm 7 Spring washer B4 DIN127 2 pcs 8 Flat washer A4 3 DIN125 2 pcs 9 HMP155 10 Hex screw M5 12 DIN912 4 pcs 11 Spring washer B5 DIN127 4 pcs 12 Flat washer A5 3 DIN125 4 pcs 13 Nut M6 DIN934 2 pcs 14 Spring washer B6 DIN127 2 pcs Chapter 3 Installation 25 ...

Page 28: ...support plate 2 Secure the mounting plate to the pole 3 Attach the radiation shield to the mounting plate 4 Remove the protective cover from the probe 5 Lead the sensor cable through the connector cover and attach the cable to the probe HMP155 User Guide M210912EN D 26 ...

Page 29: ... fitting until it locks in place Avoid using excessive force CAUTION 8 Push the connector cover over the probe connector 9 Lead the sensor cable along the sensor support and attach the cable to the sensor support with cable ties Connect the sensor cable to the M12 connector in HMP155 3 1 2 1 Mounting HMP155 and DTR13 on sensor support arm DKPFIXP44H 4 mm Allen key Chapter 3 Installation 27 ...

Page 30: ...ovided so that the center of the radiation shield when mounted is at approximately 2 meters 6 ft 7 in height 2 Mount the radiation shield DTR13 to the sensor support arm and fix it with the screws provided 3 Remove the protective cover from the probe HMP155 User Guide M210912EN D 28 ...

Page 31: ...tach the cable to the probe 5 Loosen the screw of the sensor clamp with your fingers and insert the HMP155 probe in the larger outer hole at the bottom of the radiation shield 1 2 1 Hole for additional T probe 2 Hole for HMP155 probe Chapter 3 Installation 29 ...

Page 32: ...to the smaller outer hole in DTR13 7 Push the connector cover over the probe connector 8 Tighten the screw without using excessive force 9 Lead the sensor cable along the sensor support and attach the cable to the sensor support with cable ties Connect the sensor cable to the M12 connector in HMP155 3 1 3 Installation in Stevenson screen Vaisala provides Stevenson screen adapter 221321 for mountin...

Page 33: ...nd Do not perform installation or maintenance procedures when there is a risk of thunderstorm or lightning activity in the area WARNING The radiation shield is important in protecting the sensor head from rain and splashing water and must always be used CAUTION Vaisala recommends installing HMP155 with the sensor head facing up Chapter 3 Installation 31 ...

Page 34: ...type B IEC EN 60898 1 tripping characteristics and specified for at least 28 VDC operation voltage 1 A cartridge fuse with T type IEC 60127 2 tripping characteristics and specified for at least 28 VDC operation voltage If you use your own cables make sure the current carrying capacity of them adheres to the maximum fuse size Table 12 Vaisala cables 223283 220496 220497 220498 Vaisala cables 223283...

Page 35: ... Passive output Active output 1 White Pt100 VOUT1 2 Brown RHOUT 0 1 V RS 485 B RS 485 B 3 Green Pt100 AGND 4 Yellow Pt100 VOUT2 5 Gray Pt100 6 Pink AGND RS 485 A RS 485 A 7 Blue VCC VCC 8 Red GND GND Black Shield Shield The shield is not a pin but a conductor in the connection cable Chapter 3 Installation 33 ...

Page 36: ...the HMP155D block diagram The right side shows an example of connections Make sure that the analog ground AGND and the power ground GND are isolated from each other If they are not isolated analog T and RH readings may be disturbed HMP155 User Guide M210912EN D 34 ...

Page 37: ... the ADJ button when switching on the probe see Figure 12 page 67 When HMP155 starts pins 2 and 6 have the RS 485 signal See 8 pin Connector After the next startup the default signals return to the pins The active output version with 2 voltage channels includes also a solid RS 485 connection with dedicated signal pins that can be used as a temporary digital service port Do not use both digital and...

Page 38: ...g the USB cable you must install the USB driver on your PC see Installing driver for USB cable page 37 Depending on your computer and the environmental conditions heating and purge functions may not work properly with the USB cable due to limited USB powering capability HMP155 does not echo typed characters back to the terminal screen To see the commands you type enable the local echo setting in t...

Page 39: ...ctions provided with the cable The installation may take several minutes 3 When the driver is installed connect the USB cable to a USB port on your computer Windows detects the new device and uses the driver automatically 4 Verify the COM port for the cable and the status of the cable with Vaisala USB Instrument Finder You do not need to uninstall the driver for normal use To remove the driver fil...

Page 40: ...ng with the Vaisala USB Instrument Finder program in your Windows Start menu 4 Make sure that the other serial settings are correct for your connection Change if needed See Table 14 page 36 5 To open the connection window and to start using the serial line select Open If PuTTY cannot open the serial port restart it and check the settings HMP155 User Guide M210912EN D 38 ...

Page 41: ...nfiguration screen when a session is running right click over the session window and select Change Settings from the pop up menu 4 3 HMP155 commands Most of the following commands are relevant only in the digital output version of HMP155 To issue a command type it on your computer and press Enter Chapter 4 Operation 39 ...

Page 42: ...lt 4800 E 7 1 baud 300 115200 ADDR 0 99 0 Set probe address POLL mode Table 16 Formatting commands Command Description FORM Set the output format of SEND and R commands TIME HH MM SS Set or display time UNIT Select metric or non metric output units Table 17 Chemical purge commands Command Description PUR Set automatic chemical purge Table 18 Calibration and adjustment commands Command Description ...

Page 43: ...g output modes ASEL Set or view analog output quantities and scaling AERR Change analog error output values ATEST Force analog outputs to entered values Table 20 Other commands Command Description Output information about the device Output information about the device in POLL mode ERRS List present probe errors FILT 0 1 1 Set the result filtering HELP List available commands PRES hPa Set the value...

Page 44: ...e the INTV command 4 4 2 S command Use the S command to end the RUN mode After the S command you can use any command To stop the output you can press the Esc or reset the probe To change the default power up operation mode see SMODE command page 43 4 4 3 INTV command Use the INTV command to set the output interval for the RUN mode The default value is 2 seconds INTV xxx yyy Parameter Description x...

Page 45: ... example shows SEND without a parameter send RH 24 9 RH T 22 1 C 4 4 5 SMODE command Use the SMODE command to set the user port to permanent STOP RUN POLL or SEND mode SMODE xxxx The output mode you select is activated after power outages Parameter Description xxxx STOP RUN POLL or SEND Table 21 Output modes Mode Output Available commands STOP Only with the SEND command All default mode RUN Automa...

Page 46: ...the probe 0 99 4 4 7 CLOSE command Use the CLOSE command to set the probe in temporary POLL mode After this you can only use the commands OPEN SEND and Example close line closed 4 4 8 SDELAY command Use the SDELAY command to view or set the minimum answer delay for the RS 485 port The SDELAY value can be 0 255 The default value is 10 Parameter Description 0 No extra delay added 1 4 8 ms extra dela...

Page 47: ...ne e even o odd DATA Data bits 7 or 8 STOP Stop bits 1 or 2 To activate the new communication settings reset the probe You can change the settings one parameter at a time or all parameters at once Example Changing baud only seri 4800 Baud P D S 4800 E 7 1 Changing all parameters seri 9600 e 7 1 Baud P D S 9600 E 7 1 4 4 10 ADDR command Addresses are required only in the POLL mode for multi purpose...

Page 48: ...dr Address 0 2 More information SMODE command page 43 4 5 Formatting commands 4 5 1 FORM command Use the serial line command FORM to change the format or select certain quantities for the output commands SEND and R FORM x Parameter Description x Formatter string The formatter string consists of quantities and modifiers You can only type a maximum of 73 characters after the command on the command l...

Page 49: ... kg gr lb Wet bulb temperature Tw TW C F The modifiers are shown in the following table Table 24 FORM command modifiers Modifier Description quantity Quantity name for example RH T or TDF x y Length modifier number of digits and decimal places t Tabulator r Carriage return n Line feed String constant xxx Special character with decimal code xxx U5 Unit field and length ADDR Probe address with 2 cha...

Page 50: ...N no heating h warmed probe active H purge heating active S purge cooling active X extra sensor heating active SNUM Probe serial number TIME Time hh mm ss form Temperature 5 2 t r n 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 depen...

Page 51: ...utput message cs4 Value of CS4 checksum in the output message csx Value of CSX checksum in the output message bi Value of the byte at position i 1 based in the output message n Number of bytes in the output message before the CS2 CS4 or CSX field including earlier checksum fields if any Bit wise exclusive OR operator 36 Byte value of ASCII character 42 Byte value of ASCII character 4 5 2 TIME comm...

Page 52: ...command to select metric or non metric output units UNIT M N Parameter Description M Metric units N Non metric units Example unit n Units non metric 4 6 Chemical purge commands 4 6 1 PUR command With the PUR command you can enable or disable automatic and power up chemical purge and set the purge interval If HMP155 is exposed to chemicals Vaisala recommends performing chemical purge at least once ...

Page 53: ...king measurements The output channels are locked for the first operation minutes to the initial measured values 4 7 Extra sensor heating Xheat commands HMP155 extra sensor heating follows the factory default values You can enable or disable the function change the RH limit and define the heating temperature and duration of this function The output channels are locked during extra sensor heating an...

Page 54: ...a heating time To see the current values use the XHEAT command After the defined XHEAT duration there is an additional cooling time of 10 seconds before outputs are updated Example xheat Extra heat OFF RH limit 95 RH Temperature 100 C Duration 30 s More information Extra sensor heating Xheat option page 16 4 8 Analog output configuration commands The analog outputs are set in the factory according...

Page 55: ...the terminal connection between your computer and the sensor HMP155 must be in the adjustment mode for the AMODE command to work To switch the probe to the adjustment mode hold down the ADJ button until a green LED lights up Check the analog output modes with the AMODE command Table 26 Analog output modes Analog output mode Description 3 0 1 V 4 0 5 V 5 0 10 V Analog output calibration is valid on...

Page 56: ...ty RH RH RH Temperature T C F Additional T probe temperature Ta C F Table 28 Quantities calculated from measured quantities Quantity Abbreviation Metric unit Imperial unit Dew point Frost point temperature Td f TDF C F Dew point temperature Td TD C F Mixing ratio x X g kg gr lb Wet bulb temperature Tw TW C F ASEL CH1 CH2 low1 high1 low2 high2 Parameter Description CH1 Quantity of channel 1 CH2 Qua...

Page 57: ...imits Always specify the quantities for both channels asel t td Ch0 T lo 40 00 C Ch0 T hi 60 00 C Ch1 Td lo 60 00 C Ch1 Td hi 40 00 C Example To set the quantities and scaling with a single command type the quantities and limits as parameters according to the command syntax asel rh td 0 100 60 60 Ch0 RH lo 0 00 RH Ch0 RH hi 100 00 RH Ch1 Td lo 60 00 C Ch1 Td hi 60 00 C 4 8 4 AERR command Use the A...

Page 58: ...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 Typing the ATEST command without parameters outputs the current output value ATEST V V Parameter Description V Output value for channel 1 V V Output value for channel 2 V Example atest 2 412 6301 1 943 5090 Example atest 1 5 1 5 1 500 3948 1 500 ...

Page 59: ...e conditions the PRES command is not needed If mixing ratio is used in high altitudes pressure changes increase the mixing ratio Use the serial line and do the following PRES a aaaa XPRES a aaaa Parameter Description a aaaa Ambient pressure value bar Example pres Pressure 1 013 bar Example xpres Pressure 0 000 bar 4 10 System commands The system commands are used for setting the filtering level ch...

Page 60: ...ate YYYYMMDD info NONE Time 00 01 06 Serial mode STOP Baud P D S 4800 E 7 1 Output interval 2 S Serial delay 0 Address 0 Pressure 1 013 bar Filter 0 800 Ch0 output 0 1 V Ch1 output 0 1 V Ch0 error out 0 00 V Ch1 error out 0 00 V Ch0 RH lo 0 00 RH Ch0 RH hi 100 00 RH Ch1 T lo 40 00 C Ch1 T hi 60 00 C 4 10 2 ERRS command Use the ERRS command to display the error messages Example errs No errors More ...

Page 61: ...t With FILT value 1 the probe only takes the latest measurement into account With FILT value 0 1 a new output is a combination of the previous output 90 and the latest measurement 10 FILT xxx Parameter Description xxx 0 1 1 1 0 no filter 0 1 about 16 moving average Example filt Filter 0 800 4 10 4 HELP command Use the HELP command to list the available commands Chapter 4 Operation 59 ...

Page 62: ... 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 0 255 SEND addr SERI baud p d s SMODE stop run poll TIME hh mm ss UNIT m n VERS XHEAT on off XPRES bar 4 10 5 VERS command Use the VERS command to display the software version Example vers HMP155 1 6 HMP155 User Guide M210912EN D 60 ...

Page 63: ...mand to reset the device The user port switches to the startup output mode you have selected with the SMODE command The RESET command returns the passive output version to analog output mode Example reset HMP155 1 00 Chapter 4 Operation 61 ...

Page 64: ... the sensor to Vaisala for calibration once a year or if the sensor readings seem inaccurate 5 1 1 Cleaning Clean the probe with a soft lint free cloth moistened with mild detergent 5 1 2 Changing HMP155 probe filter Over time the probe filter becomes contaminated with matter that you cannot remove by cleaning When this happens the response time becomes longer and measurement accuracy decreases Th...

Page 65: ...r removing the filter check the O ring and change it if necessary 4 Install the new filter carefully without delay 5 Install the probe back inside the radiation shield 5 1 3 Changing HUMICAP sensor You can change INTERCAP HUMICAP180R and HUMICAPR2 sensor yourself Never replace INTERCAP with HUMICAP180R or INTERCAP with HUMICAPR2 or the other way round You can replace HUMICAP180R with HUMICAPR2 and...

Page 66: ...en soldering the sensor pins CAUTION 1 Remove the filter from the probe See Changing HMP155 probe filter page 62 2 After removing the filter check the O ring and change it if necessary Figure 11 Changing INTERCAP HUMICAP180R HUMICAPR2 sensors 1 Filter 2 O ring 3 HUMICAP sensor 4 Pt100 temperature sensor 3 Remove the damaged sensor and insert a new one Handle the new sensor by the plastic socket Do...

Page 67: ...only available during the first 3 seconds after startup Table 29 HMP155 error messages Error message Description Action T MEAS error Error in temperature measurement Check the HUMICAP sensor T REF error Contact Vaisala Service Center TA MEAS error Error in T probe measurement Check the additional temperature probe TA REF error Contact Vaisala Service Center F MEAS error Error in humidity measureme...

Page 68: ...put version of HMP155 you cannot adjust the temperature If you have the chemical purge option always perform chemical purge before calibration and adjustment Vaisala recommends carrying out RH adjustment as a two point adjustment With one point adjustment you can achieve the required accuracy if the actual measurement environment RH and T is the same as the one point adjustment environment Before ...

Page 69: ...o reach ambient temperature before starting the adjustment procedure Fixed pressure compensation value of 1 01325 bar is used when in adjustment mode 6 2 Push button calibration You can calibrate and adjust HMP155 with the adjustment buttons on the probe Carry out the two point humidity adjustment by using 2 relative humidity references for example saturated salt points 11 RH LiCl and 75 RH NaCl T...

Page 70: ...adjustment buttons before the conditions have stabilized This takes approximately 30 minutes 6 Using the and buttons make sure the Aout voltage is correct and press the ADJ button The green indicator LED turns off and back on 7 Insert the probe into the high end reference chamber for example NaCl 75 RH chamber in the humidity calibrator HMK15 and perform the high humidity gain adjustment by using ...

Page 71: ...o perform one point humidity or temperature adjustment carry out the chemical purge if available See Chemical purge option page 14 2 Uncover the adjustment buttons on the probe by removing the protective cover and removing the calibration seal 3 Open the protective plug and you can see three buttons marked and There is also a two colored indicator LED See Figure 12 page 67 4 Remove the filter and ...

Page 72: ... ADJ button twice until the LED turns off To exit the adjustment mode reset the probe 6 3 Serial line calibration 6 3 1 Two point humidity adjustment The difference between the 2 humidity references must be at least 30 RH 1 Connect HMP155 to a PC See Serial line communication page 36 2 Open a terminal program 3 Carry out the chemical purge if available See Chemical purge option page 14 4 Press the...

Page 73: ...OK 13 Select OK when the adjustment has succeeded and the new calibration coefficients are calculated and stored 14 Type the calibration information date and text to the memory of the probe See the commands CTEXT command page 76 and CDATE command page 77 6 3 2 Two point temperature adjustment In the passive output version of HMP155 you cannot adjust the temperature The difference between the 2 tem...

Page 74: ...ion date and text to the probe memory See commands CTEXT and CDATE 7 Reset the probe with the RESET command More information CTEXT command page 76 CDATE command page 77 6 3 3 One point humidity and temperature adjustment You can do one point humidity and temperature adjustment with the following serial line commands For humidity adjustment CRH and FCRH For temperature adjustment CT and CTA To make...

Page 75: ...Insert the probe into the measurement hole of the high end reference chamber for example NaCl 75 RH chamber in the humidity calibrator HMK15 and press any key 11 Let the probe stabilize for about 30 minutes You can follow the stabilization by pressing ENTER 12 When stabilized type the high end reference value after the question mark and press ENTER RH 75 45 Ref2 RH 75 57 Ref2 RH 75 55 Ref2 RH 75 5...

Page 76: ...in 1 00000000E 00 Ta offset 0 00000000E 00 Ta gain 1 00000000E 00 6 4 2 LI command Use the LI command to display and ask for new values for the user adjustment parameters If you suspect that something has gone wrong with the calibration and adjustment use the LI command to return the factory values by entering the values shown in the following example Example li Cp offset 0 00000000E 00 Cp gain 1 ...

Page 77: ... T 49 5176 2 ref 50 0 OK OK indicates that the adjustment has been successful 6 4 4 CTA command Use the CTA command for two point serial line temperature calibration and adjustment of the additional temperature probe Ta CTA changes the user adjustment parameters of the additional temperature probe See also L command page 74 and LI command page 74 CTA command can only be used in adjustment mode Exa...

Page 78: ...H 75 59 Ref2 75 5 OK OK indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored 6 4 6 FCRH command Use the FCRH command for relative humidity calibration after a sensor change fcrh RH 25 19 Ref1 11 3 Press any key when ready RH 70 02 Ref2 75 5 OK OK indicates that the adjustment has been successful 6 5 Typing calibration information In the adjustm...

Page 79: ...ge To measure voltage connect HMP155 to a calibrated voltage meter To change HMP155 to the adjustment mode hold down the ADJ button until a green LED lights up You cannot use the serial line command ACAL with HMP155 passive output version Type the ACAL command and type the multimeter reading for each case Continue by pressing ENTER When a channel is specified only the specified analog output chann...

Page 80: ...rsion In the active output version you can calibrate and adjust relative humidity temperature and additional T probe temperature In the passive output version you can only calibrate and adjust relative humidity 1 Connect HMP155 to MI70 with the connection cable 221801 2 Switch on MI70 by pressing the power key and follow the instructions on the display If you have the passive output version always...

Page 81: ... adjustment and select the quantity you want to adjust The list of quantities varies depending on the configuration of your HMP155 5 To finish the adjustment follow the onscreen instructions Chapter 6 Calibration and adjustment 79 ...

Page 82: ...resis 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 20 C 40 4 F 1 2 0 012 reading RH At 40 60 C 104 140 F 1 2 0 012 reading RH At 60 40 C 76 40 F 1 4 0 032 reading RH 1 Defined as 2 standard deviation limits Small variations possible see also the calibration certificate Table 31 Temperature measurement performance Description Value...

Page 83: ...re C At 20 60 C 68 140 F 0 07 0 0025 temperature C 1 Tolerance Class AA IEC 60751 corresponds to IEC 751 1 3 Class B Figure 13 HMP155 accuracy over temperature range voltage and RS 485 Table 32 Dew point calculation specifications Property Description value Accuracy at 20 40 C 4 104 F 0 6 at 90 100 RH Table 33 Quantities measured by HMP155 Quantity Abbreviation Metric unit Imperial unit Relative h...

Page 84: ...emperature Tw TW C F 7 2 Environmental specifications Table 35 Operating environment Property Description value Operating temperature for humidity measurement 80 60 C 112 140 F Storage temperature 80 60 C 112 140 F Operating humidity 0 100 RH EMC industrial environment EN IEC 61326 1 EN 55022 Emissions CISPR 32 Class B EN 55032 ESD immunity IEC 61326 1 EN 61326 1 7 3 Accuracy of calculated variabl...

Page 85: ... 50 60 70 80 90 100 40 0 003 0 003 0 003 0 003 0 003 0 004 0 004 0 004 20 0 017 0 018 0 019 0 021 0 022 0 023 0 025 0 026 0 0 08 0 09 0 09 0 10 0 10 0 11 0 11 0 12 0 13 0 13 20 0 31 0 33 0 35 0 37 0 39 0 41 0 43 0 45 0 47 0 49 40 0 97 1 03 1 10 1 17 1 24 1 31 1 38 1 46 1 54 1 62 60 2 68 2 91 3 16 3 43 3 72 4 04 4 38 4 75 5 15 5 58 7 3 3 Accuracy of wet bulb temperature C Temperature Relative humid...

Page 86: ...emperature on the x axis and read the accuracy in dewpoint measurement on the y axis Figure 14 Accuracy of dewpoint measurement 7 4 Inputs and outputs Table 36 Inputs and outputs Property Description value Operating voltage 7 28 VDC Minimum operating voltage 0 1 V output or RS 485 7 V 0 5 V output or warmed probe 12 V 0 10 V output chemical purge or XHEAT 16 V Outputs Voltage output 0 1 V 0 5 V 0 ...

Page 87: ... Mechanical specifications Property Description value IP rating IP66 Dimensions H W 279 40 mm 10 9 1 6 in Weight 86 g 3 0 oz Materials Filter Sintered Teflon or membrane Housing Polycarbonate PC Additional temperature probe Stainless steel AISI 316L 7 6 Options and accessories Table 38 Options and accessories Description Item code Sensors INTERCAP 15778HM HUMICAP180R HUMICAP180R HUMICAP180C HUMICA...

Page 88: ...tion cable 221801 Connection cable 3 5 m 8 pin M12 220496 Connection cable 5 m 8 pin M12 223283 Connection cable 10 m 8 pin M12 220497 Connection cable 30 m 8 pin M12 220498 Other Protection set for calibration buttons protective cover 2 O rings and protective plug 221318 HMK15 humidity calibrator with mercury thermometer 19729HM HMK15 humidity calibrator with a thermometer with red capillary liqu...

Page 89: ...7 7 Dimensions 7 7 1 HMP155 dimensions Figure 15 Dimensions 7 7 2 Additional temperature probe dimensions mm in 70 2 76 Ø4 8 0 19 Figure 16 Additional T probe dimensions Chapter 7 Technical data 87 ...

Page 90: ...7 7 3 Radiation shield dimensions Figure 17 DTR503 and DTR13 dimensions HMP155 User Guide M210912EN D 88 ...

Page 91: ...r vapor pressure Dew point frost point is measured in Kelvin Mixing ratio 2 x 621 99 Pw p Pw Absolute humidity 3 A C Pw T Parameter Description C 216 679 Enthalpy 4 ℎ T 1 01 0 00189 x 2 5 x The water vapor saturation pressure at temperature Tpws is calculated over water and over ice by using 4 equations 5 8 These formulas are taken from Hyland R Wexler A Formulations of the Thermodynamic Propertie...

Page 92: ... 46094296 10 2 C2 0 13746454 10 4 C3 0 12743214 10 7 Over water 7 100 x ln PwsWATER b 1 Θ b 0 3 biΘi b4ln Θ Parameter Description b 1 0 58002206 104 b0 0 13914993 101 b1 0 48640239 10 1 b2 0 41764768 10 4 b3 0 14452093 10 7 b4 6 5459673 Over ice 8 100 x ln PwsICE a 1 Θ b 0 4 aiΘi a6ln Θ HMP155 User Guide M210912EN D 90 ...

Page 93: ...water vapor pressure 9 Pw RHx Pws 100 Parts per million by volume 10 ppmv 106x Pw p Pw Parameter Description Td Dew point temperature C Pw Water vapor pressure hPa Pws Water vapor saturation pressure hPa RH Relative humidity x Mixing ratio g kg p Atmospheric pressure hPa A Absolute humidity g m3 T Temperature K h Enthalpy kJ kg Θ Virtual temperature Appendix A Calculation formulas 91 ...

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Page 95: ... analog output errors 55 analog output scaling 54 answer delay 44 automatic chemical purge 16 available commands 59 C calibrating temperature 71 calibration 66 67 passive output 70 change mode 43 changing HUMICAP INTERCAP sensor 63 chemical purge 14 50 circuit breaker size 32 cleaning HMP155 62 command CRH 76 commands 58 53 ADDR 45 AERR 55 AMODE 53 analog output testing 56 ASEL 54 ATEST 56 CLOSE 4...

Page 96: ...H heated HMP155 10 heating 16 51 additional T probe 17 chemical purge 14 extra sensor 51 warmed probe 14 heating options 13 high humidity 14 16 HMP155 installing inside DTR13 20 27 installing inside DTR503A 24 parts 62 replacing filter 62 HMP45 12 HUMICAP changing 63 humidity 16 humidity adjustment 69 70 humidity and temperature adjustment 68 humidity sensor types 10 I installation high humidity c...

Page 97: ...be address 45 RS 485 temporary connection 35 S safety 19 sensor change 72 serial communication settings 36 serial line command 45 serial line communication 36 Stevenson screen adapter 30 system commands 57 T temperature adjustment 69 temperature probe option 17 temporary RS 485 35 terminal software 37 time 49 two point humidity adjustment 70 U units 50 USB cable 36 USB cable driver 37 USB connecti...

Page 98: ...HMP155 User Guide M210912EN D 96 ...

Page 99: ...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 Product returns If the product is faulty these steps help to speed up the return process and avoid extra costs 1 Read the warranty informatio...

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