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HMP155 User Guide in English

1. Command Description CRH Relative humidity calibration CT Temperature calibration CTA Additional temperature probe calibration FCRH Relative humidity calibration after sensor change CTEXT Give the text to calibration information field L Displays user adjustment parameters LI Displays new values for the user adjustment parameters Table 10 Setting and Testing the Analog Outputs Command Description AMODE View the analog output modes ASEL Set or view analog output quantities and scaling AERR Change the analog error output values ATEST Force the analog outputs to entered values Table 11 Other Commands Command Description Output information about the device Output information about the device in POLL mode ERRS List present transmitter errors FILT 0 1 1 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 M210912EN A Chapter 4 VAISALA Operation Getting Measurement Message from Serial Line 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 2r RH 33
2. view only view only view only SELECT EXIT Follow the instructions given on the display to finish the adjustment 71 User s Guide This page intentionally left blank 72 M210912bN A Chapter 7 Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the product Performance Relative Humidity 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 x reading RH at 40 20 C 40 4 F 1 2 0 012 x reading RH at 40 60 C 104 140 F 1 2 0 012 x reading RH at 60 40 C 76 40 F 1 4 0 032 x reading RH Factory calibration uncertainty 20 C 0 6 RH 0 40 RH 1 0 RH 40 97 RH Defined as 2 standard deviation limits Small variations possible see also calibration certificate Recommended humidity sensor HUMICAP 180R for typical applications 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 20s 90 60 s VAISALA 73 User s Guide Temperature Measurement range 80 60 C 112 140 F Accuracy with voltage output at 80 20 C 0 226 0 002
3. M210912EN A Chapter 6 Calibration and Adjustment Feeding Adjustment Information The information added with the serial line commands below is shown in the device information fields You can only use CTEXT and CDATE 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 gt ctext Cal info Helsinki FIN Finland gt CDATE Use the CDATE command to enter date to adjustment information field Set the adjustment date in format Y Y Y YMMDD Example gt cdate 20080320 gt Analog Output Adjustment In the analog output calibration the analog output is forced to the following values 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 69 User s Guide NOTE The serial line command ACAL cannot be used with HMP155 passive output version Enter 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 channel is adjusted ACAL 0 1 Example Chi gt acal 0 Ul V 1 001 U2 V y 9 011 Chis gt acal 1 Ul V 2 0988 U2 V 8
4. gt amode 3 3 CHOC Qi ges dV GhTr 0e gt NOTE If you scale the analog output quantities with AMODE command you must continue by entering the ACAL command see ACAL on page 70 44 M210912EN A Chapter 4 VAISALA Operation ASEL CH1 CH2 where CH1 Quantity of channel 1 CH2 Quantity of channel 2 Select and scale the quantities for the analog outputs with the ASEL command Note that the optional quantities can be selected only if they have been selected when ordering the device You can use ASEL command with parameters There you enter all the quantities for all the outputs at once ASEL command can also be used without parameters like in the example below in which case the transmitter will ask for each parameter separately Always enter all the quantities for all outputs For quantities and their abbreviations see Table 3 on page 11 and Table 4 on page 12 Use the command ASEL CH1 CH2 as shown in the example below when using a device with two analog outputs Example asel cr Chl T lo 40 00 C 3 Oni Thx 60 00 TG ChO RH lo 0 00 RH ChO RH hi 100 00 RH 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
5. 51 User s Guide This page intentionally left blank 52 M210912EN A 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 1 Remove the filter from the probe 2 After removing the filter check the O ring and change it if necessary See Figure 13 on page 55 3 Install a new filter on the probe New filters can be ordered from Vaisala see section Options and Accessories on page 78 VAISALA 53 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 54 To change the sensor l Remove the filter from the probe See the instructions in section Changing the Probe Filter on page 53 After removing the filter check the O ring and change it if necessary See Figure 13 on page 55 Remove the damaged sensor and insert a new one Handle the new sensor by the plastic socket DO NOT TOUCH THE SENSOR PLATE After sensor change the humidity calibration must be done according to the instructions see section Rel
6. E hh mm ss IT m n RS EAT on off ES bar M210912bN A Chapter 4 VAISALA Operation ERRS Use the ERRS command to display probe error messages see Table 14 on page 56 Example gt errs No errors gt VERS Use the VERS command to display software version information Example gt vers HMP155 1 01 gt Resetting Transmitter Using Serial Line RESET Use the RESET command to reset the device The user port switches to start up output mode selected with SMODE command Example gt reset HMP155 1 00 gt 43 User s Guide Formatting Analog Output In this section the commands for formatting the analog output settings are introduced Analog Output Settings The two analog outputs 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 Connect the probe to the PC and then open the terminal connection between your PC and the probe The probe needs to be in ADJUST mode for the AMODE command to work To put the probe in ADJUST mode hold down the ADJ button until a green LED lights up Check the analog output modes with the AMODE command Analog output modes are 3 LV 4 0 5V 5 0 10 V Example
7. 21 Xiao Yun Road Dongsanhuan Beilu Chaoyang District Beijing P R CHINA 100027 Phone 86 10 8526 1199 Fax 86 10 8526 1155 E mail china service vaisala com www vaisala com 58 M210912EN A 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 It is recommended that calibration and adjustment is carried out by Vaisala See section Vaisala Service Centers on page 58 Calibration and adjustment can also be carried out either by using the buttons on the probe or through the serial line connection 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 VAISALA Before attempting calibration the ADJ button has to be held down until a green LED lights up This turns off the heating and the additional temperature probe in the case you are using an HMP155 with either of those options After that HMP155 is ready to be checked and
8. 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 Chapter 2 Product Overview introduces the features advantages and the product nomenclature of the Humidity and Temperature Probe HMP155 Chapter 3 Installation provides you with information that is intended to help you install the Humidity and Temperature Probe HMP155 Chapter 4 Operation contains information that is needed to operate the Humidity and Temperature Probe HMP155 Chapter 5 Maintenance contains information that is needed in basic maintenance of the Humidity and Temperature Probe HMP155 Chapter 6 Calibration and Adjustment provides information and instructions concerning calibration and adjustment of the Humidity and Temperature Probe HMP155 VAISALA 5 User s Guide Chapter 7 Technical Data provides the technical data of the Humidity and Temperature Probe HMP155 Appendix A Calculation Formulas presents the equations used in the Humidity and Temperature Probe HMP155 to calculate values of dewpoint mixing ratio absolute humidity and enthalpy in normal pressure Ve
9. 0 RH T 22 1 C gt Ifa 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 The output format can be adjusted with the FORM command and the output interval can be changed with the INTV command S Use the S command to end the RUN mode After this command all other commands can be used You can also press the Esc key on your keyboard or reset the transmitter to stop the outputting See SMODE command on page 39 to change the default power up operation mode SEND ADDR Use the SEND command where ADDR is the address of the transmitter to output the reading once in STOP mode The SEND command can also be used without the address The output format depends on which parameters the transmitter can output Example without parameter gt send RH 24 9 RH T 22 1 C gt 33 User s Guide SDELAY To view or set the minimun answer delay for the user port RS 485 use the SDELAY command The value corresponds to milliseconds delay and is set between 1 255 By default the value is set to 10 where 4 8ms 255 1024 ms Example gt sdelay 15 Serial delay T5 gt Formatting Serial Line Message 34 Changing Quantities and Units Use the FORM serial line command to change the format or select certain quantities for the output commands SEND and R Use the UNIT serial line command to select metric o
10. 8997 gt MI70 Check and Adjustment 70 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 In the active output version relative humidity temperature and additional T probe temperature can be calibrated In the passive output version only relative humidity calibration is possible M210912bN A Chapter 6 Calibration and Adjustment To check and adjust HMP155 with MI70 l Connect HMP155 to MI70 by using a connection cable Vaisala item 221801 Turn MI70 on by pressing the power key and follow the instructions given on the display NOTE When turning on the passive output version always hold down the ADJ button simultaneously VAISALA Activate the adjustment mode by holding down the ADJ button on the probe until the message below appears on the MI70 display HAIN HENU 45 gt Starting adjustment mode for HHP155H 4 Automatic power off is disabled during the adjustment mode OK _ CANCEL 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 SELECT QUANTITY
11. LED on the probe If using a warmed probe for measuring probe heating will be interrupted when ADJ button is pressed 2 Wait some time for the probe to reach ambient temperature Enter the CT command or CTA for additional T probe and press ENTER 4 Press ENTER a few times to check if the reading is stabilized Let the reading stabilize give the reference temperature after the question mark and press ENTER three times Example 2 point adjustment gt ct T 18 6038 1 ref T 18 6068 1 ref T 18 6098 1 ref 19 0 Press any key when ready T 49 5176 2 ref 50 0 OK gt 5 Move the probe into another reference temperature and let the reading stabilize Give the reference temperature after the question mark and press ENTER see example above 66 M210912EN A Chapter 6 VAISALA Calibration and Adjustment 6 OK indicates that the calibration has succeeded Enter the calibration information date and text to the transmitter s memory see the serial commands CTEXT and CDATE 7 Reset the probe with RESET command 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 gt fcrh RH c 25 19 Refl 11 3 Press any key when ready RH 70 02 Ref2 75 5 OK gt The OK indicates that the calibration has been succesful One Point Hum
12. Line 33 VAISALA User s Guide Doe 33 Sens aden coit ed aive des ate AE 33 SEND ADDR niente ERR 33 SPELAT science eR dene adalat de 34 Formatting Serial Line Message esee 34 Changing Quantities and Units 34 FORM tet 34 UNIT MIN treinta een T 36 OVERIGE ON OFF cies itte htt rtt hence 36 Pressure Compensation Setting ssssssss 37 THING y iip E Hoi rt genie cot ed ee et EAR 38 TIME HAMM SS uiii cett ttt deett ertt cc 38 Sonal Se Ung 5 iecit tetto beh EA 38 SERI BAUD PARITY DATA STOP 38 SMODE gr ertet te Deb ttu bidue EA 39 n 40 Data cn m 40 EILT 0 T dT aeneo tae ret teet rte eerte 40 Deeded ted er EE vetus ero A cocue du bean tates For dec me deeds 41 HEED siet eerta terreri eas ette Pre eda esa Ree tases 42 i eaa eea RAE EEE REAA AER waste oes neces 43 NER D AEE A E AAE ARRE RS 43 Resetting Transmitter Using Serial Line 43 RESET erum pe eene tete AETR 43 Formatting Analog Output eem 44 Analog Output Settings ssseeee 44 AMOBPE 5i eth oia eq t eee epos 44 ASEL CHT GHA2 ertt e 45 ATEST fest nnnc eden attt en acies 45 AERE3S amer ete mtn oat onte e tae ce 46 ADDR ives tti iit tir tot i t e ee es 47 OPEN bec adt n dtes 47 CLOSE nte ttt utem 47 Sensor Functions e
13. M210912EN A Chapter 4 Operation 9 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 gt 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 i STOP Baud P DS 4800 E 7 1 Output interval 29 Serial delay 0 Address 0 Pressure i 1 013 bar Filter 0 800 ChO output 2508 uc LM Chl output i m el ChO error out 0 00 V Chl error out 0 00 V ChO RH lo 0 00 SRH ChO RH hi 100 00 RH Chl T lo 40 00 C Chl T hi 60 00 C gt VAISALA 41 User s Guide 42 HELP Use the HELP command to list the available commands Example gt help TR DD ER Q D L ch0 ch1 R 0 99 R errl err2 DE chil ch2 quantityl quantity2 lowl highl low2 high2 D HW 1 p ST valuel value2 cal date Qoaarrrrre OHNE Q CTA CTEXT cal info ERRS FCRH FILT value FORM format string E FJ H HELP INTV 0 255 s min h EN addr ERICE on off awa R ES bar on off ES ET A AY 0 255 zi O M U di p zi dist R Vx lt M cHuuuduuduuduu u uKuuootc D addr RI baud p d s DE stop run poll
14. calibrated When the T probe is turned off during calibration it does not need to be inserted into the same reference conditions with the humidity probe If a chemical purge option is available it should always be carried out before calibration 59 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 60 0801 076 Figure 14 HMP155 Adjustment Buttons The following numbers refer to Figure 14 above nA BWN Re Protective cover Down button ADJ button Up button Protective plug There is a two colour indicator LED located under the protective plug and next to the Down button see Figure 14 above The LED is green and red M210912EN A Chapter 6 Calibration and Adjustment NOTE If you are using a warmed probe HMP155 active output version option probe heating will be interrupted when ADJ button is pressed see Figure 14 on page 60 Allow sufficient time for the probe to reach ambient temperature before starting the adjustment procedure NOTE Fixed pressure compensation value of 1 01325 bar is used when in adjustment mode 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
15. salt points 11 RH LiCl and 75 RH NaCl The difference between the two humidity reference points must be at least 30 RH The difference between the two temperature reference points must be at least 30 C NOTE In push button calibration the probe outputs are by default relative humidity in the range 0 100 RH in CH1 and temperature in the range 40 60 C in CH2 VAISALA Two Point Humidity and Temperature Adjustment To make a humidity or temperature adjustment 1 Carry out the chemical purge if available 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 o and There is also a two coloured indicator LED See Figure 14 on page 60 4 Press the ADJ button and hold it down until the green indicator LED lights up This puts HMP155 in RH calibration mode 61 User s Guide 5 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 This takes approximately 30 minutes 6 Using the and buttons make sure the Aout voltage is correct and press the ADJ button Green indicator LED turns off and back on NOTE Do not tou
16. serial line and do the following PRES a aaaa where a aaaa Ambient pressure value bar Example gt pres Pressure 1 013 bar gt XPRES a aaaa where a aaaa Ambient pressure value bar Example gt xpres Pressure 0 000 bar gt VAISALA 37 User s Guide 38 Time To set or display the current time use the TIME serial line command TIME HH MM SS Example gt time 12 00 00 Time 12 00 00 gt When you set the current time for the probe with the TIME command the time will be displayed as long as the probe is turned on The time setting will not be stored in any memory At reset or when the probe is turned off the time will go back to 00 00 00 Serial Settings SERI BAUD PARITY DATA STOP To set the communication settings use the SERI serial line command SERI BAUD PARITY DATA STOP where baud Bit rate 300 600 1200 2400 4800 9600 19200 parity Parity n none e even o odd data Data bits 7 or 8 stop Stop bits 1 or 2 You need to reset the transmitter to activate the new communication settings set with SERI command The settings can be changed one parameter at a time or all parameters at once Example Changing all parameters gt seri 9600 e 7 1 Baud P D S 9600 E 7 1 gt M210912EN A Chapter 4 VAISALA Operation Example Changing baud only gt seri 4800 Baud P D S 4800 E 7 1 gt S
17. value ATEST V V where V Output value for channel 1 V V Output value for channel 2 V 45 User s Guide Example 1 gt atest 24412 6301 1 943 5090 gt Example 2 gt atest 1 5 1 5 1 500 3948 1 500 3948 gt AERR Use the AERR serial line command to set or view the error output from analog outputs AERR CHOERR CH1ERR where CHOERR CHIERR Il Analog output Analog output Example gt aerr ChO error out 10 000V O Chl error out 1 000V O gt 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 46 M210912EN A Chapter 4 VAISALA Operation ADDR Addresses are required only for POLL mode see serial line command SMODE on page 39 Use the ADDR command to input the RS 485 transmitter address Without parameters ADDR command displays current transmitter address When a parameter is specified it sets the transmitter address to the given value ADDR 0 99 where 0 99 address default 0 Example the transmitter is configured to address 2 gt addr Address to OF 2 gt OPEN When all transmitters on the RS 485 bus are in POLL mode the OPEN command sets one transmitter tempor
18. 15 6 24 2 3 1 gt FORM command returns the default output format The default output format depends on the device configuration FORM command returns the current output format of the transmitter You can only give a maximum of 73 characters after the command on the command line gt form OK gt send RH 23 8 RH T 19 4 C gt 35 User s Guide 36 UNIT M N Use the UNIT command to select metric or non metric output units UNIT M N where M Metric units N Non metric units Example gt unit n Units non metric gt OVERICE ON OFF Use the OVERICE command to select the probe dewpoint output in below freezing temperatures When overice is set to OFF and the temperature is below freezing the probe outputs dewpoint readings If overice is set to ON and the temperature is below freezing the probe outputs a frostpoint reading overice off Overice OFF M210912EN A Chapter 4 Operation Pressure Compensation Setting 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 But if mixing ratio is used in high altitudes the pressure changes will increase the mixing ratio Use the
19. 8 x temperature C at 20 60 C E Accuracy with passive resistive output According to IEC 751 1 3 t 0 055 0 0057 x temperature C Class B 0 1 0 00167 x temperature C Accuracy with RS 485 output at 80 20 C 0 176 0 0028 x temperature C at 20 60 C 0 07 0 0025 x temperature C See graph below ET as 04 o3 02 01 EE R5485 ouput mmm votage ouput 0804 032 Figure 15 Accuracy over Temperature Range Voltage and RS 485 Temperature sensor Pt 100 RTD 1 3 Class B IEC 751 Response time 63 for additional temperature probe in 3 m s air flow 63 96 20s 90 9 35s Operating Environment 74 Operating temperature range for humidity measurement 80 60 C 112 140 F Storage temperature range 80 60 C 112 140 F Electromagnetic compatibility Complies with EMC standard EN61326 1 Electrical equipment for measurement control and laboratory use EMC requirements for use in industrial locations M210912EN A Chapter 7 Technical Data Calculated Variables Table 15 Calculated Variables Quantity Abbreviation Metric Unit Non Metric Unit Dewpoint Frostpoint TDF C F Temperature Tar Dewpoint Temperature Tq TD C F Mixing ratio x X g kg gr Ib Wetbulb temperature Tw TW C F Accuracies of Calculated Variables Accuracies of the calculated varia
20. 9673 10 a Coefficients over ice a_j 0 56745359 104 ag 0 63925247 101 aj 0 96778430 10 2 a 0 62215701 10 6 a3 0 20747825 10 8 a4 0 94840240 10 12 ag 0 41635019 10 The water vapor pressure is calculated using P Ac O 9 Parts per million by volume is calculated using ppm 10 55 10 p P 83 User s Guide 84 Symbols T dewpoint temperature C P water vapor pressure hPa Pws water vapor saturation pressure hPa RH relative humidity 96 mixing ratio g kg atmospheric pressure hPa absolute humidity g m3 temperature K enthalpy kJ kg virtual temperature Q 3 MoaCS M I M210912EN A www vaisala com
21. MODE 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 Example gt smode Serial mode STOP POLL gt Table 13 Selection of Output Modes Mode Output Available Commands STOP Only with the SEND command All default mode RUN Automatic output Only command S POLL Only with the SEND adar Use with RS 485 buses command Selected output mode will be activated after power outages 39 User s Guide 40 INTV Use the INTV command to set the outputting interval for the RUN mode The default value for this command is 2 seconds INTV xxx yyy where Xxx Output interval 0 255 where 0 is the fastest possible output rate yyy Unit s min or h Example gt intv 1 min Interval 1 min gt Data Filtering 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 1s 1 The output is calculated based on the following formula new result filt old result 1 0 filt FILT xxx where xxx 0 1 1 where 1 0 no filter and 0 1 about 16 moving average Example gt filt Filter 0 800 gt
22. Vourl white RS 485 B brown Agwp green Vour2 yellow Il RS 485 A pink Vee blue GND red SHIELD black 00 1 OV tA 4A C2 P2 Il ll 22 M210912EN A Chapter 3 VAISALA Installation 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 Pt100 0802 039 Figure 8 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 passive output version by resetting the probe while simultaneously holding down the ADJ button see Figure 14 on page 60 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 22 The default signals are returned to the pins after the next reset 23 User s Guide 24 This page intentionally left blank M210912EN A 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 RS 485 Interface HMP155 supports a two wire RS 485 communication The RS 485 interface is non isolated and offers a maximum communications rate of 19200 bits s There is n
23. arily to STOP mode so that other commands can be entered OPEN ADDR where ADDR address of the transmitter 0 99 CLOSE The CLOSE command places the probe in temporary POLL mode After this only addressable commands can be used Example gt close line closed 47 User s Guide 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 The decrease of sensor gain due to an interfering chemical and the effect of the chemical purge process are illustrated below see Figure 12 below The sensor polymer absorbs the interfering chemical and this reduces the ability of the polymer to absorb water molecules and consequently the sensor gain decreases In chemical purge heating the humidity sensor to a temperature level of approximately 180 C for several minutes evaporates the interfering chemical 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 48 Calibr
24. asurement data message right as you are typing the S command to stop the sending Therefore you may need to repeat the S command This must be noted especially when designing computer programs to access the HMP155 You can also use the Ese key on your keyboard to stop the sending 26 M210912EN A Chapter 4 VAISALA Operation Installing the Driver for the USB Cable Before taking the USB cable into use you must install the provided USB driver on your PC When installing the driver you must acknowledge any security prompts that may appear The driver is compatible with Windows 2000 Windows XP and Windows Vista 1 Check that the USB cable is not connected Disconnect the cable if you have already connected it 2 Insert the media that came with the cable or download the driver from www vaisala com 3 Execute the USB driver installation program setup exe and accept the installation defaults The installation of the driver may take several minutes 4 After the driver has been installed connect the USB cable to a USB port on your PC Windows will detect the new device and use the driver automatically 5 The installation has reserved a COM port for the cable Verify the port number and the status of the cable using the Vaisala USB Instrument Finder program that has been installed in the Windows Start menu The reserved ports are also visible in the Ports section of the Windows Device Manager Remembe
25. ation values L L1 Measured values is after chemical exposure ote bee RL Output signal 4 Humidity 0508 035 Figure 12 Decrease of Sensor Gain M210912EN A Chapter 4 VAISALA Operation 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 This can be necessary if the measuring environment contains high concentrations of interfering chemicals The automatic chemical purge can also be turned off if necessary Manual Chemical Purge The chemical purge must be performed always before RH calibration see section Calibration and Adjustment on page 59 or when there is a reason to believe that a sensor has become exposed to an interfering chemical Manual chemical purge can be activated by turning the power up purge on temporarily and resetting the probe After the operation the power up purge can be turned off see PUR command on page 49 Make sure that the temperature of the sensor has come down to normal temperature before starting a calibration Chemical Purge in Power Up Chemical purge start up purge can be set to start within 10 seconds from the power up of the device Starting and Configuring Chemical Purge In this section th
26. ative Humidity Adjustment after Sensor Change on page 67 Attach a new filter on the probe M210912bN A Chapter 5 Maintenance 0802 159 Figure 13 Changing the Sensor The following numbers refer to Figure 13 above 1 2 3 4 VAISALA Filter O ring HUMICAP sensor Pt100 temperature sensor 55 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 46 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 58 Sometimes it is possible that the transmitter is not responding after startup due to an error If this happens change the bauds to 19200 N 8 1 and then execute the ERRS command to see what error caused the problem The possible error messages of HMP155 are listed in Table 14 below Table 14 Error Messages Error Message Description Action T MEAS error Error in temperature Check the HUMICAP measurement sensor T REF error Error in temperature Contact Vaisala Service measurement Center see page 58 TA MEAS error Error in T probe Check the additional measurement temperature probe TA REF error Error in T probe Contact Vaisala Ser
27. bles depend on the calibration accuracy of the humidity and temperature sensors here the accuracies are given for 2 RH and 0 2 C Accuracy of Dewpoint Temperature C Relative humidity Temp 10 20 30 40 50 60 70 80 90 100 0 2 54 1 37 1 00 081 0 70 063 0 57 0 53 0 50 0 48 20 2 87 1 56 1 13 092 0 79 0 70 064 059 0 55 0 53 40 3 24 1 76 1 27 1 003 088 0 78 0 71 O65 061 0 58 60 3 60 1 96 142 1 14 097 086 0 78 0 72 0 67 0 64 Accuracy of Mixing Ratio g kg Ambient Pressure 1013 mbar Relative humidity Temp 10 20 30 40 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 31 033 0 35 037 O39 0 41 00 43 045 047 0 49 40 0 97 1 03 1 10 1 17 1 24 11 31 1 38 146 1 54 1 62 60 2 68 2 91 3 16 343 3 72 404 438 475 515 5 58 VAISALA 75 User s Guide Temp Accuracy of Wet Bulb Temperature C Relative humidity 10 20 30 40 50 60 70 80 90 100 76 0 20 0 20 0 20 0 20 020 020 020 020 0 21 0 21 0 22 022 022 022 023 023 0 27 0 28 0 28 029 029 0 29 0 30 030 0 31 0 31 0 45 045 045 044 044 044 043 043 042 0 42 0 84 0 77 0 72 0 67 O64 O61 O58 0056 054 0 52 1 45 1 20 1 03 091 083 076 0 71 O67 0 63 0 60 Accuracy of Dewpoint Measurement Find the intersection of the dewpoint temperature curve and the dewpoint difference reading process temperature dewpoi
28. cally to minimize shock hazard CAUTION Do not modify the unit Improper modification can damage the product or lead to malfunction Regulatory Compliances Vaisala HUMICAP Humidity and Temperature Probe HMP155 complies with the following performance and environmental test standards Electromagnetic Compatibility Complies with EMC standard EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements for use in industrial locations VAISALA 7 User s Guide Recycling fs Recycle all applicable material Dispose of batteries and the unit according to statutory regulations Do not dispose of with regular household refuse Trademarks HUMICAP is a registered trademark of Vaisala Microsoft Windows Windows NT Windows 2000 Windows XP and Windows Vista are registered trademarks of Microsoft Corporation in the 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 8 M210912EN A Chapter 1 General Information Warranty Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold hereunder to be free from defects in workmanship or material during a period of twelve 12 months from the date of deliv
29. ch the adjustment buttons before the conditions have stabilized 7 Insert the probe into the high end reference chamber for example NaCl 75 RH chamber in the humidity calibrator HMK15 and do the high humidity gain adjustment by using the and buttons to make sure the Aout voltage is correct To finish the RH calibration press the ADJ button and the red indicator LED lights up 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 Insert the probe into a known reference temperature 1f HMK15 Humidity Calibrator is not used and let the temperature reading stabilize NOTE Do not touch the adjustment buttons before the conditions have stabilized 62 9 Using the and buttons make the temperature offset adjustment by making sure the Aout voltage is correct and press the ADJ button Red indicator LED turns off and back M210912EN A Chapter 6 Calibration and Adjustment NOTE If you do not wish to perform the two point temperature adjustment at this time press the ADJ button one more time so that the red indicator LED turns off After reset HMP155 exits the calibration mode Otherwise continue following the instructions from step 10 onwards 10 Insert the probe into another reference tem
30. e 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 In applications where the chemical exposure is not likely the interval can be longer 49 User s Guide Type PUR and press Enter to proceed The maximum interval is 14400 minutes 10 days Example gt pur Interval Purge OFF Interval 720 min Power up Purge OFF Duration 240 s Settling 240 s Temperature i 4080 GT NOTE 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 Sensor Heating This function is optionally available only in probes with HUMICAP 180RC sensor 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 Sensor heating starts up when the relative humidity of the measuring environment reaches the RH val
31. erence in temperature conditions between the T probe and the humidity probe will result in false RH readings The two probes need to be installed so that the humidity probe does not heat the T probe but is close enough for the probes to share the same environmental conditions When the RH reading is required always install the T probe in the place where you need the reading from M210912EN A Chapter 2 VAISALA 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 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 15 User s Guide This page intentionally left blank 16 M210912EN A Chapter 3 Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the product 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 DTR503A in DTR13 or in a Stevenson screen See Fig
32. ery save for products for which a special warranty is given If any Product proves however to be defective in workmanship or material within the period herein provided Vaisala undertakes to the exclusion of any other remedy to repair or at its own option replace the defective Product or part thereof free of charge and otherwise on the same conditions as for the original Product or part without extension to original warranty time Defective parts replaced in accordance with this clause shall be placed at the disposal of Vaisala Vaisala also warrants the quality of all repair and service works performed by its employees to products sold by it In case the repair or service works should appear inadequate or faulty and should this cause malfunction or nonfunction of the product to which the service was performed Vaisala shall at its free option either repair or have repaired or replace the product in question The working hours used by employees of Vaisala for such repair or replacement shall be free of charge to the client This service warranty shall be valid for a period of six 6 months from the date the service measures were completed This warranty is however subject to following conditions a A substantiated written claim as to any alleged defects shall have been received by Vaisala within thirty 30 days after the defect or fault became known or occurred and b The allegedly defective Product or part shall should Vaisa
33. eseeeeeeeeeeeeeeeneenenn ennt 48 Chemical Purge Optional seeeeeeee 48 Automatic Chemical Purge Interval Purge 49 Manual Chemical Purge ssseene 49 Chemical Purge in Power Up sseeene 49 Starting and Configuring Chemical Purge 49 li E E E E E EEE E E EEE E AT 49 sensor HOANG ee DDR REP ERO 50 Setting Humidity Sensor Heating sss 51 AEA To eite een eie 51 CHAPTER 5 Lgs rireuc 53 Periodic Maintenance eeeeeeeeenennenn nnn 53 Cleaning cater ect ete ev d a dede 53 Changing the Probe Filter seseeeeeee 53 Changing the Sensor sssssee eee 54 Error Stat s cce Rees 56 Technical S pport a e neret eee 57 Return Instructions eere nnns 57 2 M210912bN A Vaisala Service Centers cesses enne 58 CHAPTER 6 CALIBRATION AND ADJUSTMENT eene 59 Push Button Calibration eene 61 Two Point Humidity and Temperature Adjustment 61 One Point Humidity and Temperature Adjustment 63 Passive Output Version Push Button Calibration 64 Serial Line Calibration een 65 Two Point Humidity Adjustment sess 65 Two Poi
34. essories Description Item code SENSORS HUMICAP180R HUMICAP180R HUMICAP180 HUMICAP 180 FILTERS Sintered Teflon Filter O ring 219452SP TRANSMITTER MOUNTING ACCES SORIES Buttons protective cover 2 O rings and protective plug T probe Installation Adapter for 221069 DTR13 T probe Installation Adapter for 221072 DTR502B HMP 155 and T probe Installation 221321 Adapter for Stevenson Screen CONNECTION CABLES USB Cable 221040 MI70 Connection Cable 221801 Connection Cable 3 5m 8 pin M12 220496 Connection Cable 10m 8 pin M12 220497 Connection Cable 30m 8 pin M12 220498 OTHER Protection Set for Calibration 221318 Humidity Calibrator HMK15 See HMK15 order form M210912bN A Chapter 7 Technical Data Dimensions in mm inches HMP155 Probe 279 10 98 266 10 47 20 0 79 12 0 47 86 3 39 N a Chie hs Bp 24 0 94 0801 077 Figure 17 Probe Dimensions Additional Temperature Probe 5 4 8 0 19 E L T1 EHE rr 70 2 76 0801 078 Figure 18 Additional Temperature Probe Dimensions VAISALA 79 User s Guide This page intentionally left blank 80 M210912EN A Appendix A APPENDIX A Calculation Formulas CALCULATION FORMULAS VAISALA This Appendix contains the formulas used for the calculated output quantities The HMP155 series p
35. icular purpose and all other obligations and liabilities of Vaisala or its representatives with respect to any defect or deficiency applicable to or resulting directly or indirectly from the Products supplied hereunder which obligations and liabilities are hereby expressly cancelled and waived Vaisala s liability shall under no circumstances exceed the invoice price of any Product for which a warranty claim is made nor shall Vaisala in any circumstances be liable for lost profits or other consequential loss whether direct or indirect or for special damages User s Guide This page intentionally left blank 10 M210912EN A 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 polymer sensor HUMICAP 180R Temperature measurement is based on resistive platinum sensors Pt100 Both the humidity and temperature sensors are located at the tip of the probe protected by a sintered Teflon filter The HMP155 comes in active and passive output models where the relative humidity voltage output is similar but the temperature output is either active or passive resistive Active output version has eithe
36. idity and Temperature Adjustment One point humidity and temperature adjustment can be done by using the following serial line commands 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 OK 67 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 L With the L command you can display user adjustment parameters Example gt l Cp offset Cp gain T offset T gain Ta offset Ta gain P offset P gain gt LI I 697 pEX On V EC 00000000E 00 00000000E 00 00000000E 00 00000000E 00 00000000E 00 00000000E 00 00000000E 00 00000000E 00 With the LI command you can display and ask for new values for the user adjustment parameters Example 21i Cp offset Cp gain T offset T gain Ta offset Ta gain P offset P gain gt OE ES Se c 00000000E 00 000000001 000000001 000000001 000000001 000000001 000000001 000000001 E 00 E 00 E 00 E 00 E 00 E 00 E 00 VV VV VV VY 0 NOTE If you suspect that something has gone wrong with the calibration you can use the LI command to return the factory values by entering the values shown in the example above 68
37. is VAISALA USER S GUIDE Vaisala HUMICAP Humidity and Temperature Probe HMP155 M210912EN A PUBLISHED BY Vaisala Oyj Phone int 358 9 8949 1 P O Box 26 Fax 358 9 8949 2227 FIN 00421 Helsinki Finland Visit our Internet pages at http www vaisala com Vaisala 2008 No part of this manual may be reproduced in any form or by any means electronic or mechanical including photocopying nor may its contents be communicated to a third party without prior written permission of the copyright holder 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 Sale Table of Contents CHAPTER 1 GENERAL INFORMATION 0 cccccceceseeeseeeceeeeeeeeseeaeeeeeeeeeeseeeeeaneeseeeeeseeseeaees 5 About This Manual 2 ccccceceeeeeeeeeeeeeeeeeeeeeeeneeeeeeeeseesenanee 5 Contents of This Manual sss 5 Version Information ct e eri qe aaa 6 Related Manuals ett bte d neben tetetud 6 General Safety Considerations sessssss 6 Eeedback ui mie nmeidde eterne 7 Product Related Safety Precautions 7 Regulatory Compliances eee 7 Electromagnetic Compatibi
38. ized give the reference humidity after the question mark and press ENTER gt crh RH 16 6675 1 ref RH 16 4978 1 ref RH 16 3956 1 ref 11 25 Press any key when ready RH 11 25 Ref2 9 Now the device is waiting for the high end reference Insert the probe into the measurement hole of the high end reference chamber for example NaCl 75 RH chamber in the humidity calibrator HMK15 Press any key when ready 10 Let the probe stabilize for about 30 minutes You can follow the stabilization by pressing ENTER 11 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 754 59 Retf2 v 75 5 OK VAISALA 65 User s Guide 12 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 13 Reset the probe with the RESET command 14 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 Note that the difference between the two temperature references must be at least 30 C To make a temperature adjustment 1 Press the ADJ button to enable the adjustment mode This lights up the green
39. la so require be sent to the works of Vaisala or to such other place as Vaisala may indicate in writing freight and insurance prepaid and properly packed and labelled unless Vaisala agrees to inspect and repair the Product or replace it on site VAISALA This warranty does not however apply when the defect has been caused through a normal wear and tear or accident b misuse or other unsuitable or unauthorized use of the Product or negligence or error in storing maintaining or in handling the Product or any equipment thereof c wrong installation or assembly or failure to service the Product or otherwise follow Vaisala s service instructions including any repairs or installation or assembly or service made by unauthorized personnel not approved by Vaisala or replacements with parts not manufactured or supplied by Vaisala d modifications or changes of the Product as well as any adding to it without Vaisala s prior authorization e other factors depending on the Customer or a third party Notwithstanding the aforesaid Vaisala s liability under this clause shall not apply to any defects arsing out of materials designs or instructions provided by the Customer This warranty is expressly in lieu of and excludes all other conditions warranties and liabilities express or implied whether under law statute or otherwise including without limitation any implied warranties of merchantability or fitness for a part
40. lity sess 7 Recycling inei nen 8 Trademarks ee hene OE 8 License Agreement seen nennen 8 Warran E 9 CHAPTER 2 PRODUCT OVERVIEW ceeueeseeseeeeeseentnnnne nennen nnne tn nnne nnn nnne nnn 11 Introduction to HMP155 sse 11 Basic Features and Options sss 12 Structure of HMP155 ssssssssssseee 13 Additional Temperature Probe Option ssse 14 Warmed Probe Option ssssssssssseeeee 15 CHAPTER 3 INSTALLATION CE 17 Installation in Radiation Shields 17 Installation In D TS T9 aite encre 18 Installation in DT ROSA t het rettet pen testo 19 Installation in DTR502B sss 20 Installation in Stevenson Screen ssssssss 21 B PIN Connector ote cav vcase cence tecaienavedccnancteasenatvnscanndeee 22 Temporary RS 485 Connection Option 23 CHAPTER 4 OPERATION pape 25 Getting Started entendre 25 RS 485 Interface cena eren 25 Serial Line Communication ceeeeeeesss 26 Installing the Driver for the USB Cable 27 Terminal Program Settings sssseseees 28 List of Serial Commands sss 31 Getting Measurement Message from Serial
41. necedssetuerevesecevseedueeess 77 Options and Accessories eeeesseseeseeesee 78 Dimensions in mm inches eenn 79 HMP 155 Probe ee Leiter dens ted ete t tuns 79 Additional Temperature Probe ccccccesseeeceeeeeeeeeees 79 APPENDIX A CALCULATION FORMULAS eeeeeeeeeeeeneennenen nennen nenne nennen nn 81 VAISALA User s Guide List of Figures Figure 1 HMP 155 Probe due eae anteire 13 Figure 2 HMP155 with Additional T probe sse 14 Figure 3 HMP155 with T probe Installed in DTR13 18 Figure 4 HMP155 Installed in DTR503A sssseeeeeeee 19 Figure 5 T probe Installed in DTR502B ssse 20 Figure 5 HMP155 with T Probe Installed in Stevenson Screen 21 Figure 6 Wiring of HMP155 8 Pin Connector sseesess 22 Figure 7 Pins Connected to Pt100 passive output version 23 Figure 8 Starting HyperTerminal Connection esessssss 28 Figure 9 Connecting to HyperTerminal eee 29 Figure 10 HyperTerminal Serial Port Settings essssssss 30 Figure 11 Decrease of Sensor Gain sssssseeeeee 48 Figure 12 Changing the Sensor ssssssseee eene 55 Figure 13 HMP155 Adjustment Buttons sssseeeeee 60 Figure 14 Accuracy o
42. nt temperature on the x axis and read the accuracy in dewpoint measurement on the y axis Dewpoint temperature C Accuracy in dewpoint measurement C Dewpoint difference C 0508 017 Figure 16 Accuracy of Dewpoint Measurement M210912EN A Chapter 7 Technical Data Inputs and Outputs Mechanics VAISALA Outputs Voltage output Resistive Pt100 4 wire connection RS 485 Note minimum operating voltages 0 5 V output 0 10 V output probe heating chemical purge or XHEAT Average current consumption 15 VDC load 100 kOhm 0 1 V output 0 10 V output RS 485 During chemical purge With warmed probe Operating voltage Settling time at power up Voltage output RS 485 User cable connector Connection cable lengths Cable coating Max wire size Additional temperature probe cable length Additional temperature probe material Service cables Filter Housing material Housing classification Weight Probe 3 5 m cable 30 m cable 0 1V 0 5V 0 10V 12 V 16 V lt 3 mA 0 5 mA 4 mA max 110 mA max 150 mA 7 28 VDC 2s 3s M12 series 8 pin connector male 3 5 m 10 m or 30 m PUR AWG 26 2m Stainless steel AISI 316L USB connection cable 1 45 m Item 221040 MI70 connection cable Item 221801 Sintered PTFE PC IP66 86g 159g 1260 g 77 User s Guide Options and Accessories 78 Table 16 Options and Acc
43. nt Temperature Adjustment s 66 Relative Humidity Adjustment after Sensor Change 67 EGRE xz ueteres RE 67 One Point Humidity and Temperature Adjustment 67 User Adjustment Commands eene 68 Ie ce mund koc E tese tier nor cc cime koe mes 68 deem E B b tee eut cm d tts 68 Feeding Adjustment Information 69 CT EX etait i PH Eo t Ee bre etu cds 69 CDA TE p p fetibus 69 Analog Output Adjustment eene 69 ACAL 0 1 e otto ine OOo eene 70 MI70 Check and Adjustment eene 70 CHAPTER 7 TECHNICAL DATA itte here eer ere tees ads eee Dr tere 73 Performance esses eene enne nnn nnn nnn nnns 73 Relative Humidity ssseeee en 73 Tempetature 52er decore eec Teast eroe 74 Operating Environment ener enn 74 Calculated Variables eene 75 Accuracies of Calculated Variables 75 Accuracy of Dewpoint Temperature C ssususe 75 Accuracy of Mixing Ratio g kg Ambient Pressure 1013 quor cR 75 Accuracy of Wet Bulb Temperature C eects 76 Accuracy of Dewpoint Measurement ssssss 76 Inputs and Outputs eeeseeeeeeeeeeeeereerenrt 77 MeCHANICS iii occas ee ceticees seed evedectesevedsuterdded
44. o internal termination for the RS 485 on the HMP155 If any termination is needed the bus should be terminated at both ends The recommended termination is R termination with 120 Ohm resistors Typically the termination resistors are only needed when the fastest communications rate 19200 bit s is used for longer distances If the resistors are used the possible increase in current consumption should be taken into account VAISALA 25 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 27 NOTE When using the USB cable no separate power unit is needed The probe is powered through the USB port For permanent interfacing to host system use the serial line You can change the serial settings and operate in RUN STOP and POLL modes HMP155 does not echo typed characters back to the terminal screen To see the commands you type you need to enable the local echo setting in your terminal program A new command cannot be received while the instrument is sending data out Wait until the instrument has completed its response before entering the next command NOTE In the RUN mode the instrument may send the me
45. perature NOTE Do not touch the adjustment buttons before the conditions have stabilized 11 Using the and buttons make the temperature gain adjustment by making sure the A voltage is correct 12 Press the ADJ button and the red indicator LED turns off One Point Humidity and Temperature Adjustment To make a one point humidity or temperature adjustment 1 Carry out the chemical purge if available 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 o and There is also a two coloured indicator LED See Figure 14 on page 60 4 Remove the filter and insert the probe into a measurement hole of the salt chamber to do the humidity adjustment 5 Press the ADJ button and hold it down until the green indicator LED lights up This puts HMP155 in RH calibration mode NOTE Do not touch the adjustment buttons before the conditions have stabilized VAISALA 6 Using the and buttons make sure the Aout voltage is correct and press the ADJ button Green indicator LED turns off and back on 63 User s Guide 7 To move on to the temperature adjustment press the ADJ button once and the red indicator LED lights up 8 Insert the probe into the reference temperature NOTE Do not touch the adjustment buttons before the conditions ha
46. r two analog outputs or an RS 485 digital output Passive output version has 4 wire temperature measurement and an analog voltage output for relative humidity measurement The quantities measured and calculated by HMP155 are presented in Table 3 below The quantities available as an option are presented in Table 4 on page 12 Table 3 Quantities Measured by HMP155 Quantity Abbreviati Metric Unit Non Metric on Unit Relative humidity RH RH RH RH Temperature T T C F Additional T probe Ta C oF temperature Ta VAISALA 11 User s Guide Table 4 Calculated Quantities Measured by HMP155 Quantity Abbreviation Metric Non Metric Unit Unit Dewpoint Frostpoint TDF C F Temperature Tus Dewpoint Temperature Ty TD C F Mixing ratio x X g kg gr lb Wetbulb temperature T TW C F Basic Features and Options Can be used to replace HMP45A D also in radiation shields Improved performance with the HUMICAP 180R sensor and alternatively the HUMICAP 180RC sensor Also available with the HUMICAP 180 sensor Warmed humidity probe for improved performance in constant high humidity active output version Different voltage ranges possible 0 1 V 0 5 V 0 10 V active and passive output versions Different T output scales possible 40 60 C 20 40 C 80 60 C active output version Chemical purge option for applications
47. r non metric output units 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 When entering the command use the abbreviations of the quantities For more information on quantities see Table 3 and Table 4 on page 11 The modifiers are presented in Table 12 on page 35 M210912EN A Chapter 4 VAISALA Operation Table 12 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 ME String constant XXX Special character with decimal code xxx U5 Unit field and length ADDR Transmitter address with two characters 00 99 ERR Error flags for P T Ta RH 0000 1111 0 no error STAT Transmitter status in 7 character field for example N no heating h probe heating active power H purge heating active temperature S purge cooling active temperature X sensor heating active temperature SNUM Transmitter serial number TIME Time hh mm ss Example gt form Temperature 5 2 t r n OK gt send Temperature 24 23 gt gt form Twet 6 3 tw U3 t T t U3 r n OK gt send Twet 11 290 C T 24 231 C gt gt form 5 1 rh t t t tdf r n OK gt send
48. r to use the correct port in the settings of your terminal program Windows will recognize each individual cable as a different device and reserve a new 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 Table 5 Default Serial Communication Settings for the User Port Parameter Value Bauds 4800 Parity Even Data bits 7 Stop bits 1 Flow control None 27 User s Guide 28 After power up the transmitter in STOP mode outputs the software version and the command prompt HMP155 0 98 2 In RUN mode a measurement output starts immediately after power up In POLL mode the transmitter does not output anything after power up see section on page 39 Terminal Program Settings The following instructions show a connection example with HyperTerminal program included in the Microsoft Windows Follow the instructions below to open a HyperTerminal program 1 Start HyperTerminal To get help for starting HyperTerminal click Start select Help to open Windows help and search for HyperTerminal Connection Description B Hew Connection Erte name and choose an icon lor the connection Hare HMPA Icar Ms
49. rcumstances in which the fault occurs occurred name and contact information of a technically competent person who can provide further information on the problem 3 Pack the faulty product in a strong box of adequate size with proper cushioning material to avoid damage 4 Include the information specified in step 2 in the box with the faulty product Also include a detailed return address 5 Ship the box to the address specified by your Vaisala contact VAISALA 57 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 NORTH AMERICAN SERVICE CENTER Vaisala Inc 10 D Gill Street Woburn MA 01801 1068 USA Phone 1 781 933 4500 Fax 1 781 933 8029 E mail us customersupport vaisala com EUROPEAN SERVICE CENTER Vaisala Instruments Service Vanha Nurmijirventie 21 FIN 01670 Vantaa FINLAND Phone 358 9 8949 2658 Fax 358 9 8949 2295 E mail instruments service vaisala com TOKYO SERVICE CENTER Vaisala KK 42 Kagurazaka 6 Chome Shinjuku Ku Tokyo 162 0825 JAPAN Phone 81 3 3266 9617 Fax 81 3 3266 9655 E mail aftersales asia vaisala com BEIJING SERVICE CENTER Vaisala China Ltd Floor 2 EAS Building No
50. robe measures relative humidity and temperature From these values dewpoint and frostpoint mixing ratio wet bulb temperature absolute humidity and enthalpy in normal pressure are calculated using the following equations Dewpoint frostpoint Tj el 273 15 7 5 1 zl 1010 w B5 P is the water vapor pressure Dewpoint frostpoint is measured in Kelvin Mixing ratio x 62199x gt Q Absolute humidity P A 2Cx 3 T 3 81 User s Guide 82 where C 216 679 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 H20 from 173 15 K to 473 15 K Ashrae transactions 1983 Part 2A pp 500 513 PWS over water 3 T Y CL 5 i 0 PWS over ice O T 6 where Tpws temperature in K Cj coefficients Co 4 931358 Cj 0 46094296 10 2 C2 0 13746454 10 4 C3 0 12743214 1077 M210912bN A Appendix A VAISALA Calculation Formulas Over water b l 100x In P iris a 2 50 t b InO 7 b 0 Over ice a 4 100xIn P per Ya 0 a nO 8 b 0 where b Coefficients over water b j 0 58002206 104 bg 0 13914993 10 bj 0 48640239 10 1 b gt 01764768 10 4 bs 0 14452093 10 7 b4 0 6545
51. rsion Information Table 1 Manual Revisions Manual Code Description M210912EN A June 2008 First release Related Manuals Table 2 Related Manuals Manual Code 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 Warning alerts you to a serious hazard If you do not read and follow instructions very carefully at this point there is a risk of injury or even death CAUTION Caution warns you of a potential hazard If you do not read and follow instructions carefully at this point the product could be damaged or important data could be lost NOTE Note highlights important information on using the product 6 M210912bN A 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 Product Related Safety Precautions 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 periodi
52. s 3eu Lo J emen 0801 073 Figure 9 Starting HyperTerminal Connection 2 In New Connection window of the HyperTerminal define a name for HMP155 serial connection for example HMP155 Click OK M210912EN A Chapter 4 VAISALA Operation In Connect using pull down menu select the PC communications port where the serial cable is connected If your computer has only one COM port it is called COMI Click OK Connect To us Enter details for the phone number that vou want to dial E ountry region Area code Phone number Comect using 0801 074 Figure 10 Connecting to HyperTerminal 4 In the Properties window set the port settings to match the settings of your HMP155 For HMP155 Flow control must always be set to None Finally click OK to start using the serial connection 29 User s Guide COM1 Properties Port Settings Bits per second Data bits Faiy Stop bits e v 0801 075 Figure 11 HyperTerminal Serial Port Settings 5 Inthe HyperTerminal main window select File gt Save to save the serial port settings To use the saved settings later start HyperTerminal and in the New Connection window click Cancel and select File gt Open 30 M210912EN A Chapter 4 VAISALA Operation List of Serial Commands Most of the commands listed below can only be used in active output version of HMP155 These commands are marked wi
53. th 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 Description R Start the continuous outputting S Stop the continuous outputting INTV 0 255 S MIN H Set the continuous output interval for RUN mode SEND 0 99 Output the reading once SMODE Set the serial interface mode STOP RUN POLL SEND SDELAY O 255 View or set user port RS 485 answer minimum delay SERI baud p d s User Port settings Default 4800 E 7 1 baud 300 115200 ADDR 0 99 Set the transmitter address for POLL mode OPEN 0 99 Open a temporary connection to a POLL mode device CLOSE Close the temporary connection Back to POLL mode Table 7 Formatting Commands Command Description FORM Set the output format of SEND and R commands OVERICE ON OFF Select the output for below freezing temperatures TIME HH MM SS Set or display the time UNIT Select the metric or non metric output units Table 8 Chemical Purge Commands Optional Command Description PUR Set the automatic chemical purge Table 9 Calibration and Adjustment Commands Command Description ACAL 0 1 Analog output calibration CDATE Set the calibration date 31 User s Guide 32
54. ue set by a user RH limit You can define the RH sensor heating temperature as well as the duration of the heating After the heating cycle the humidity conditions are checked and new sensor heating is performed if the predefined conditions are reached again NOTE During the sensor heating the outputs are locked to the values measured before the heating cycle 50 M210912bN A Chapter 4 Operation Setting Humidity Sensor Heating When the HMP155 leaves the factory the sensor heating follows the factory default values You can enable or disable the function change the RH limit and define the heating temperature and duration of this function XHEAT Enables or disables the sensor heating Example gt xheat on Extra heat ON gt xheat off Extra heat OFF gt 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 0 100 RH default 95 RH function starts up above the setpoint Extra heating temperature 0 200 C default 100 C Extra heating time 0 255 s default 30 s To see the current values use the XHEAT command Example gt xheat Extra heat OFF RH limit 95 RH Temperature i 100 C Duration 30 s gt NOTE After the defined XHEAT duration there is an additional cooling time of 10 seconds before outputs are updated VAISALA
55. ure 3 on page 18 Figure 4 on page 19 and Figure 6 on page 21 VAISALA 17 User s Guide Installation in DTR13 0801 071 Figure 3 HMP155 with T probe Installed in DTR13 18 M210912EN A Chapter 3 Installation Installation in DTR503A 0801 072 Figure 4 HMP155 Installed in DTR503A VAISALA u u W User s Guide Installation in DTR502B 0809 006 Figure 5 T probe Installed in DTR502B In Figure 5 above the HMP155 additional T probe is installed in DTR502B radiation shield using a Vaisala installation adapter Vaisala item code 221072 20 M210912EN A Chapter 3 Installation Installation in Stevenson Screen 0805 008 Figure 6 HMP155 with T Probe Installed in Stevenson Screen VAISALA 21 User s Guide 8 Pin Connector Both the passive and active versions of HMP155 come with an 8 pin connector on the bottom of the probe 5 6 A a a 4 e 3 1 BD 8 0507 044 Figure 7 Wiring of HMP155 8 Pin Connector The pins of the connector for HMP155 passive output version in Figure 7 are open end wire colors in brackets 1 PT100 white RHour0 1 V brown RS 485 B PT 100 green PT100 yellow PT 100 grey Agnp pink RS 485 A Voc blue GND red SHIELD black Il Il 00 1 OV tA 4A C2 P2 Il The pins of the connector for HMP155 active output version in Figure 7 are open end wire colors in brackets 1
56. ve stabilized 9 Using the and buttons make the temperature offset adjustment by making sure the A voltage is correct and press the ADJ button Red indicator LED turns off and back on 10 Press the ADJ button one more time so that the red LED turns off to indicate the probe has quit the calibration mode 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 64 M210912bN A 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 Connect the HMP155 to a PC See section Serial Line Communication on page 26 Open a terminal program 2 Carry out the chemical purge if available Press the ADJ button and the green LED lights up 4 Remove the filter from the probe and insert the probe into a measurement hole of the dry end reference chamber for example LiCl 11 RH Enter the CRH command and press ENTER Wait at least 30 minutes for the sensor to stabilize Press ENTER a few times to check if the reading has stabilized Qo mp og UA When the reading has stabil
57. ver Temperature Range Voltage and RS 485 74 Figure 15 Accuracy of Dewpoint Measurement sss 76 Figure 16 Probe Dimensions essee emen 79 Figure 17 Additional Temperature Probe Dimensions 79 List of Tables Table 1 Manual REVISIONS ics cob cit ert itr dece ettet it o ePi Un 6 Table 2 Related Manuals 31 2 ceci tig eei eec 6 Table 3 Quantities Measured by HMP1595 sese 11 Table 4 Calculated Quantities Measured by HMP156 12 Table 5 Default Serial Communication Settings for the User Port 27 Table 6 Measurement Commands sss en 31 Table 7 Formatting Commands sss eene 31 Table 8 Chemical Purge Commands Optional sssss 31 Table 9 Calibration and Adjustment Commands sssss 31 Table 10 Setting and Testing the Analog Outputs 32 Table 11 Other Cormarnds 3 toc besee be tee ble rbi 32 Table 12 FORM Command Modifiers seeeeene 35 Table 13 Selection of Output Modes sssssseessssseeee 39 Table 14 Error MeSSages crier e t teret t s de to setas 56 Table 15 Calculated Variables ssssseeee 75 Table 16 Options and Accessories sssssssssssse 78 4 M210912bN A Chapter 1 General Information CHAPTER 1 GENERAL INFORMATION
58. vice measurement Center see page 58 F MEAS error Error in humidity Check the HUMICAP measurement sensor F REF1 error Error in humidity Contact Vaisala Service measurement Center see page 58 F REFS error Error in humidity Contact Vaisala Service measurement Center see page 58 Program flash checksum error Internal error Contact Vaisala Service Center see page 58 Parameter flash checksum error Internal error Contact Vaisala Service Center see page 58 INFOA checksum error Internal error Contact Vaisala Service Center see page 58 SCOEFS checksum error Internal error Contact Vaisala Service Center see page 58 M210912EN A Chapter 5 Maintenance Technical Support For technical questions contact the Vaisala technical support E mail helpdesk vaisala com Fax 358 9 8949 2790 Return Instructions If the product needs repair please follow the instructions below to speed up the process and to avoid extra costs to you 1 Read the section Warranty on page 9 2 Contact Vaisala Service Center or a local Vaisala representative The latest contact information and instructions are available from www vaisala com Addresses of the Service Centers are provided in section Vaisala Service Centers on page 58 Please have the following information on hand serial number of the unit date and place of purchase or last calibration description of the fault ci
59. where interfering chemicals in the measuring environment pose a risk active output version Additional temperature probe T probe with fast response active output version USB connectivity for service connections via the optional USB M12 cable active and passive output versions Installation kits for T probe into DTR13 and DTR502B radiation shields Installation kit for Stevenson screen active and passive output version both with and without additional T probe MI70 connectivity for field checking and calibration active and passive output versions 12 M210912bN A Chapter 2 Product Overview Structure of HMP155 0801 070 Figure 1 HMP155 Probe The numbers refer to Figure 1 above 1 Filter 2 Protective cover 3 8 Pin connector M12 VAISALA 13 User s Guide 14 N 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 Tg dewpoint value obtained from the humidity probe and the T value obtained from the T probe When installing HMP155 with T probe it is important to make sure that the humidity probe and the T probe are installed in the same conditions in order to get accurate readings Even a slight diff

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