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HMP240
Appendix 1: Serial commands

M210300en

The output scales can also be given directly with the ASCL command.

ASCL aaa.a bbb.b ccc.c ddd.d <cr>

aaa.a

lower limit of channel 1

bbb.b

upper limit of channel 1

ccc.c

lower limit of channel 2

ddd.d

upper limit of channel 2

For example, when relative humidity is scaled to 0...100 %RH on channel 1
and temperature to -40...+100

C on channel 2:

>ASCL 0 100 -40 100 <cr>
Ch1

(RH) lo

0.000 %RH

Ch1

(RH) hi

100.000 %RH

Ch2

(T )

-40.000 'C

Ch2

(T )

100.000 'C

Summary of Contents for HMP240 SERIES

Page 1: ...HMP240 SERIES TRANSMITTERS User s Guide M210300en A June 2002 ...

Page 2: ...produced in any form or by any means electronic or mechanical including photocopying nor may its contents be communicated to a third party without a prior written notice of the copyright holder The instruction manuals may be changed without prior notice ...

Page 3: ... 3 Entering numbers 26 5 3 4 Analogue output commands 27 5 3 4 1 Selecting the output mA V 27 5 3 4 2 Selecting and scaling the analogue output quantities 28 5 3 5 Output via the serial bus 29 5 3 5 1 Turning the serial interface echo ON OFF 29 5 3 5 2 Serial bus settings 29 5 3 5 3 Setting the transmitter address 30 5 3 5 4 Selecting the output units 31 5 3 5 5 Selecting the calculation mode 31 5...

Page 4: ...nds 46 6 1 2 3 With LED commands 47 6 1 3 Humidity calibration procedure after sensor change 48 6 1 3 1 With serial commands 48 6 1 3 2 With display keypad commands 48 6 1 3 3 With LED commands 49 6 1 4 Humidity calibration table 50 6 2 Temperature calibration 50 6 2 1 One point offset calibration 51 6 2 1 1 With serial commands 51 6 2 1 2 With display keypad commands 51 6 2 1 3 With LED commands ...

Page 5: ...ve humidity with additional T sensor head 63 8 3 2 Accuracy of other calculated variables 64 8 4 Outputs 65 8 5 Electronics 65 8 6 Mechanics 66 8 7 Electromagnetic compatibility 67 SPARE PARTS AND ACCESSORIES 68 APPENDIX 1 SERIAL COMMANDS 69 APPENDIX 2 INSTALLING AND USING THE RS 485 422 SERIAL PORT MODULE 91 APPENDIX 3 INSTALLING AND USING THE DIGITAL CURRENT LOOP MODULE 102 APPENDIX 4 ERROR MESS...

Page 6: ...HMP240 series User s guide M210300en iv This page intentionally left blank ...

Page 7: ...ailable readings The transmitter has two analogue outputs and can be connected to a serial bus via the RS 232C interface or through an RS 485 422 serial module or a digital current loop module There are various possibilities for the configuration of the transmitter It can have either a blank cover or a cover with a local display and keypad with which to operate the transmitter Two analogue output ...

Page 8: ...culation vari ables dewpoint difference mixing ratio absolute humidity wet bulb temperature Serial interface RS 232C standard RS 485 422 digital current loop module Display cover cover with local display keypad Filters sintered filter PPS grid with steel netting Cable lengths 2 5 or 10 meters Installation aids Installation kit for temperatures up to 180 C HMP243MIK Meteorological installation kit ...

Page 9: ...nation of both the dew formation and rapid changes of temperature a rapid rise in temperature can cause a corresponding increase of water vapour in the ambient In these conditions the temperature of the sensor head rises more slowly and can remain below the dewpoint of the ambient for a while Dew then forms on the sensor head and it may take several hours or in the worst case several days for the ...

Page 10: ... the sensor head cable and then flow on to the sensor head When there is no alternative but to install the sensor head in the process vertically the point of entry must be carefully insulated The cable must also be allowed to hang loosely in order to prevent any water that possibly condenses on the cable from running onto the sensor head Install the humidity sensor head in the process wherever pos...

Page 11: ...efully insulated NOTE The two sensor heads should be installed so that the humidity sensor head does not warm the T sensor head i e the T sensor head is installed closer to the process flow When the RH reading is required always install the T sensor head in the place where you need the reading from The HMP243 can be installed in ducts and channels with the help of the in stallation kit the kit con...

Page 12: ...elp of flanges and supporting bars The sensor head can also be installed vertically m h h t o b e s e a l e d s i l i c o n e h u m i d i t y s e n s o r h e a d T s e n s o r h e a d s t a i n o r a P T F E s l e e v e a b u s h i n g c a b l e g l a n d s e a l V i t o n o p t i o n a l Figure 3 3 Vertical installation of the HMP243 sensor heads when a bushing is used its size is selected accord...

Page 13: ...ntally in the measuring chamber or in duct a supportive thread bar set HMP247TBS can be ordered from Vaisala order code HMP247TBS A Probe head installation 1 Make hole with M20x1 5 thread in the measurement chamber or process wall The smoothness of the thread circle should be R 6 3 microm 2 Install the cable gland EN50262 version A example AGRO 1160 20 145 on the thread of the process wall 3 Push ...

Page 14: ...rough the nut and press the cable through the cutting line of the sealing 4 Turn the supporting bars into the sensor head s threaded holes 5 Turn the sleeve on the opposite end of the supporting bar and trim to the right length 6 Cut away the overage supporting bar with saw 7 Press the sleeves together with cable inside and install the sensor head to a process through the fitting body 8 Tighten th...

Page 15: ...ip the nut and rubber ring over the cable insulation slip the brass disk that has the bigger hole in it over the braid so that it rests against the cable insulation slip the other brass disk over the wires to the middle of the braid If the cable diameter is less than 7mm use a shrinking tube or an adhesive tape cable braid flexible wires 0 5 mm AWG 20 stranded wires recommended 2 D Ø 7 10 mm 3 bra...

Page 16: ...ng and the shield of the signal cable to external system are all connected to each other After this the whole system can be grounded from one point only If the grounding is made via several points sensor head transmitter housing signal cable make sure that the different groundings are made to the same grounding potential Otherwise harmful grounding currents may be generated If you do the grounding...

Page 17: ...d CH2 are connected together internally Do not use power supply ground as output signal ground POWER SUPPLY HMP 243 Figure 3 6 Electrical connections Power supply 24 VDC 24 VAC see Chapter 3 4 1 Output signals 0 20 mA 4 20 mA 0 1 V 0 5 V 0 10 V Power supply ground is connected to the housing with parallel connection of 15 nF capacitor and 300 kΩ resistor ...

Page 18: ... Figure 3 7 A However if several transmitters have to share one transformer the phase must always be connected to connector in each transmitter see Figure Figure 3 7 B 24 VAC HMP243 transmitter HMP243 transmitter Controller shared common line 24 VAC 24 VAC HMP243 transmitter HMP243 transmitter Controller supply voltage signal output supply voltage signal output supply voltage signal output supply ...

Page 19: ...4 1 Changing the parameters If necessary the user can subsequently change the measurement units between metric and non metric and select and scale the output signals with software functions This is done through commands either utilizing the menus on the local display or giving commands through the serial interface see Appendices Most often the commands are used to change the settings of the two an...

Page 20: ...e see Chapter 5 Should the application require variables that are not included in the configuration of the transmitter the user is invited to contact Vaisala or a Vaisala representative 4 3 Selecting the analogue outputs The HMP240 transmitter can be ordered ready with the current or voltage outputs required If the outputs need to be changed move the jumpers in con nector X15 into positions as sho...

Page 21: ...utputs with jumpers The software has to be informed which outputs are in use This is done either through the serial interface or the menus on a local display The serial command is AMODE and the display keypad command Mode ð Analog outputs ð Mode see Chapter 5 For the scaling of the outputs see serial command ASCL and the display command Mode ð Analog outputs ð Scale All the jumpers are used only w...

Page 22: ...mpers 4 4 Connecting the RS 232C serial bus RX GND TX NC OPENED COVER OF THE HMP 243 X6 Figure 4 4 Serial bus connections To connect a PC to the HMP240 transmitter via the RS 232C serial bus one of the following cables is required The type of the cable depends on the terminal and the connector type ...

Page 23: ...ex NOTE When the serial bus settings are changed the transmit ter has to be reset before the new settings become ef fective The processor does not allow the following combinations no parity 7 data bits 1 stop bit if this combination is given the HMP240 programme will change the number of stop bits to 2 even or odd parity 8 data bits 2 stop bits if this combination is given the programme changes th...

Page 24: ...tter and the PC are connected to different mains outlets To minimize the possibility of these interfer ences always use the same mains outlet same phase of the mains electricity for the PC and the power supply of HMP240 This is especially the case when using the serial line connector X17 The serial line connector X6 is more immune to these interferences than connector X17 4 4 1 Reverting to factor...

Page 25: ...gs have been given the transmitter must be reset The jumper must be removed before the transmitter is reset if the jumper is in place when power is turned on the transmitter does not work After jumper insertion the transmitter is in STOP mode ready to receive commands The same method is used when the transmitter is in POLL mode and the user has forgotten its address CAUTION Inserting a jumper in a...

Page 26: ...ts A full range of commands can be given through the display keypad or through the RS 232C serial bus The commands can be used e g to select and scale the outputs to calibrate the humidity and temperature channels as well as the analogue outputs and to set the serial interface 5 1 Commands and security lock jumper In order to prevent any tampering with the transmitter settings the transmitter cann...

Page 27: ... The LEDs will light up for 2 3 seconds OPENED COVER OF THE HMP 243 press switches LEDs UP DOWN ENT Figure 5 1 Location of press switches and LEDs Use the up and down switches marked with arrows on the printed board to find the desired command code and acknowledge it with the ENT switch The command codes are l lit dark 0 return to normal state l 1 relative humidity calibration l 2 temperature cali...

Page 28: ... the transmitter back to the display mode 5 3 3 Entering numbers When numbers need to be entered into the transmitter programme e g when scaling or setting the analogue outputs in calibration or when giving the transmitter an address the field is either empty or the currently valid figure is displayed Any previously given value is deleted with the CL key When the field is empty a cursor blinks on ...

Page 29: ...hanged with the ar row keys and acknowledged with the ENT key the lower limit starts flashing acknowledge the lower limit with ENT or start changing it by pressing CL a new lower limit is given one character at a time with the arrow keys the upper limit starts flashing acknowledge the upper limit with ENT or start changing it by pressing CL a new upper limit is given one character at a time with t...

Page 30: ...e arrow keys and acknowledged with the ENT key the lower limit starts flashing acknowledge the lower limit with ENT or start changing it by pressing CL a new lower limit is given with the arrow keys the upper limit starts flashing acknowledge the upper limit with ENT or start changing it by pressing CL a new upper limit is given with the arrow keys When channel 1 has been set the programme goes on...

Page 31: ...he arrow keys to select the right alternative and press ENT 5 3 5 2 Serial bus settings Select Seri in the main menu the currently valid serial interface set tings are displayed If the settings are correct press ENT the programme returns to the display mode If the settings need to be changed press CL Select the parameter to be changed with the arrow keys and ENT key Selecting baud rate Selecting p...

Page 32: ... combination is given the programme changes the number of stop bits to 1 NOTE The serial bus settings become effective only after reset 5 3 5 3 Setting the transmitter address Address is used when more than one transmitter is connected to one serial bus this way it is possible to communicate with one transmitter at a time Select Addr in the main menu the following is displayed Pressing ENT returns...

Page 33: ... 5 3 6 Output modes The output modes only affect output through the serial interface the transmit ter accepts all display and LED commands irrespective of which serial output mode it is in The HMP240 transmitter has three serial output modes RUN STOP and POLL In the RUN mode the transmitter outputs measurements automatically through the serial interface to a PC or a peripheral The only command tha...

Page 34: ...y the settings can be checked through it 5 3 6 1 Setting the serial interface operation mode Select Mode in the main menu the following is displayed Select Serial output The currently valid setting flashes Select the desired mode with the arrow keys and press ENT After this the programme returns to the Mode Menu When Run mode is selected the currently valid output interval is dis played The output...

Page 35: ...enu Pressing ENT returns the programme to the main menu without changing the filtration time If the filtration time needs to be changed press CL enter the new filtration time with the arrow keys 5 3 7 2 Setting the pressure for mixing ratio and wet bulb calculations The atmospheric pressure has an effect on mixing ratio and wet bulb Accurate calculations can be achieved only when the ambient press...

Page 36: ...nd press ENT the days 17 start flashing use the arrow keys to change them and press ENT 5 3 7 4 Setting the time Select More in the main menu select Time in the More menu If the time is correct acknowledge it by pressing ENT this takes the programme back to the More menu If the time needs to be changed press CL first the hours 14 start flashing use the arrow keys to change them and press ENT the m...

Page 37: ... given In the com mands cr stands for carriage return 5 4 1 Analogue output commands 5 4 1 1 Setting the analogue outputs Disconnect the security lock jumper AMODE a bb bbb cc ccc d ee eee ff fff cr a channel 1 U voltage output I current output bb bbb lower limit of channel 1 cc ccc upper limit of channel 1 d channel 2 U voltage output I current output ee eee lower limit of channel 2 ff fff upper ...

Page 38: ...outputs Disconnect the security lock jumper ASCL cr Example relative humidity is scaled in the range 0 100 RH and tem perature in the range 40 160 C ASCL cr Ch1 RH lo 0 000 RH cr Ch1 RH hi 100 000 RH cr Ch2 T lo 0 000 C 40 cr Ch2 T hi 100 000 C 160 cr 5 4 2 Output via the serial bus 5 4 2 1 Starting the measurement output R cr Starts output of measurements to the peripheral devices RUN mode the on...

Page 39: ...999 9 C Td 9999 9 C a 9999 9 g m3 x 9999 9 g kg Tw 999 9 C cr lf The output mode can be changed with command FORM see Appendix 1 5 4 2 4 Setting the output interval for the RUN mode INTV xxx yyy cr xxx output interval 0 255 0 no pause between outputs yyy unit s min or h Example output interval is changed into 10 minutes INTV 10 min cr Output intrv 10 min 5 4 2 5 Serial bus settings SERI b p d s x ...

Page 40: ...p bits to 1 NOTE The serial bus settings become effective only after reset When the half duplex mode is set it will automatically turn the echo off Even then the ECHO command can indicate that echo is on 5 4 2 6 Selecting the output units UNIT x cr x m etric units n on metric units metric non metric RH RH RH T C F Td C F dT C F a g m3 gr ft3 x g kg gr lb Tw C F 5 4 2 7 Setting the averaging time D...

Page 41: ... is given address 99 ADDR cr Address 2 99 cr 5 4 2 9 Setting the calculation mode Disconnect the security lock jumper FROST ON OFF cr This command is used to select whether the transmitter calculates the frostpoint default or the dewpoint reading at dewpoint temperatures below 0 C Select FROST ON for frostpoint and FROST OFF for dewpoint calculations For example Frost cr Frost ON Frost off Frost O...

Page 42: ...ds can be used In RUN mode outputting automatically only command S can be used In POLL mode measurements output only with command SEND When in POLL mode the output mode is changed as follows OPEN aa cr SMODE xxxx cr aa address of the transmitter xxxx STOP RUN or POLL The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be given Example SMODE STOP cr setting STOP mod...

Page 43: ...effect CLOSE sets the transmitter in POLL mode In POLL mode command OPEN sets the transmitter temporarily in STOP mode command CLOSE returns the instrument to POLL mode Example relative humidity calibration is performed at transmitter 2 which is in POLL mode OPEN 2 cr opens the line to transmitter 2 CRH cr calibration started CLOSE cr line closed ...

Page 44: ...t the temperature of the sensor head stabilizes correctly and the warming function does not interfere with the stabilization The stabilization of the humidity sensor head can be monitored by the RH reading or by the T reading the T reading is actually that of the humidity sensor head stabilizing to the ambient temperature When the security lock jumper is disconnected the serial port and analogue o...

Page 45: ...he transmitter includes the re gaining option the sensor re gaining must always be done before humidity calibration Before starting the calibration make sure that the temperature of the composite sensor has come down to ambient temperature see Appendix 7 6 1 1 One point humidity calibration The HMI38 humidity data processor can be used as a one point field calibra tor A two point calibration with ...

Page 46: ...H 11 9 Ref1 c cr RH 11 5 Ref1 c cr RH 11 5 Ref1 11 3 cr Press any key when ready Press any key and cr when the transmitter requests the second point value RH yy y Ref2 cr 6 1 1 2 With display keypad commands Make sure that the sensors of the transmitter and the reference instrument are close to each other Allow enough time for the sensor heads to stabilize to the measurement conditions Disconnect ...

Page 47: ... One push of a switch changes the output by 0 05 RH the change of the output voltage or current de pends on the output scaling Press ENT switch The second LED from left starts flashing press ENT again NOTE If neither channel normally outputs the RH reading during the calibration channel 1 outputs the RH reading 0 100 RH corresponding to the current voltage scale selected for this channel 6 1 2 Two...

Page 48: ... any key enter the second point value and press cr RH xx x Ref2 yy y cr The stabilization of the sensor can be monitored by entering c cr 6 1 2 2 With display keypad commands Leave the calibrator and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap on the transmitter Disconnect the security lock jumper Insert the sensor h...

Page 49: ...er to the analogue outputs connector X2 Give command l At the first cali bration point the LED on the left flashes adjust the first point offset with the arrow switches to the value given in the calibration table Chapter 6 1 4 and press ENT switch Insert the sensor head into the measurement hole of the NaCl chamber Wait at least 20 minutes for the reading to stabilize Check that the reading corres...

Page 50: ... minutes for the reading to stabilize Give command FCRH cr enter the first point value and press cr FCRH cr RH xx x Ref1 yy y cr Press any key when ready The stabilization of the sensor to the reference humidity can be monitored by entering c cr RH 11 9 Ref1 c cr RH 11 5 Ref1 c cr RH 11 5 Ref1 11 3 cr Press any key when ready Insert the sensor head into the measurement hole of the NaCl chamber Wai...

Page 51: ...to the measurement hole of the LiCl chamber Wait at least 20 minutes for the reading to stabilize Connect an ammeter voltmeter to the analogue outputs connector X2 Give command l At the first cali bration point the LED on the left flashes adjust the first point with the arrow switches to the value given in the calibration table Chapter 6 1 4 and press ENT switch Insert the sensor head into the mea...

Page 52: ...3 1 13 1 13 1 13 NaCl RH 75 6 75 5 75 3 75 1 74 9 4 20 mA 16 10 16 08 16 05 16 02 15 98 0 20 mA 15 12 15 10 15 06 15 02 14 98 0 1 V 0 756 0 755 0 753 0 751 0 749 0 5 V 3 780 3 775 3 765 3 755 3 745 0 10 V 7 56 7 55 7 53 7 51 7 49 Table 1 Greenspan s calibration table If the LiCl solution is used or stored at temperatures below 18 C 64 F its equilibrium humidity changes permanently 6 2 Temperature ...

Page 53: ...smitter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap prior to calibration Disconnect the security lock jumper Check the transmitter against the reference Select T 1 point cal or Ta 1 point cal change the reading to correspond to the reference and press ENT 6 2 1 3 With LED commands Leave the reference instrument and the transmitter f...

Page 54: ...u want to see how the sensor stabilizes to the refer ence temperature enter c cr instead of the first refer ence T 0 90 Ref1 c cr T 0 55 Ref1 c cr T 0 55 Ref1 0 0 cr Press any key when ready For the additional temperature sensor head give command CTA cr enter the first point value and press cr CTA cr Ta 20 07 Ref1 20 08 Press any key when ready Change the temperature and check the transmitter agai...

Page 55: ...int reading with the ar row keys and press ENT 6 2 2 3 With LED commands Leave the reference instrument and the transmitter for at least 4 hours in the same space so that their temperatures have time to equalize Remove the filter cap prior to calibration Disconnect the security lock jumper Check the transmitter against the reference Connect an ammeter voltmeter to the analogue outputs connector X2...

Page 56: ... channels have 0 10 V outputs set with AMODE command enter the voltages measured at the analogue outputs ACAL cr Ch1 U1 V 0 123 cr Ch1 U2 V 9 98 cr Ch2 U1 V 0 120 cr Ch2 U2 V 9 98 cr 6 3 2 With display keypad commands Disconnect the security lock jumper Connect an ammeter voltmeter to the output of channel 1 select Cali in the main menu and Analog outputs in the Cali menu The follow ing is display...

Page 57: ...l 1 with the arrow keys and press ENT the LED on the left flashes set the low end of channel 2 with the ar row keys and press ENT the second LED from the left flashes set the high end of channel 2 with the arrow keys and press ENT The analogue outputs are calibrated to ensure the correct scaling for example when the output is scaled to 4 20 mA the low end of the scale is 4 mA and high end 20 mA ex...

Page 58: ... is used disconnect the security lock jumper and wait until the temperature of the probe has stabilized to the same temperature with the reference meter When the security lock jumper is disconnected the HMP240 is like any other RH transmitter outputting the RH and T values for further details see Chapter 6 7 2 Self diagnostics The HMP240 transmitter goes through a self diagnostics procedure when t...

Page 59: ... the Pt100 sensor carefully into the connectors Fasten the pins by soldering them with Multicore 96S Flux 381 Make sure the solder joints are good and check that the pins are not short circuited Remove possible splashes from the solder joint with distilled water but take care not to damage the humidity sensor After sensor change the humidity calibration must be done according to the instructions i...

Page 60: ...ed and press any key Enter the second point gain reference reading 7 4 2 With display commands Select Cali in the main menu and then Ta select two point calibration Ta 2 point cal Change the first point reading with the arrow keys and press ENT Set the Pt 100 simulator at the highest temperature to be calibrated and adjust the second point gain to the reference reading 7 4 3 With LED commands Conn...

Page 61: ...up the corresponding temperature value from a Pt 100 conversion table or calculate it according to the following equation T D0 R x D1 R x D2 R x D3 R x D4 where D0 243 5673014 D1 2 278542701 D2 0 002050681 D3 6 15025E 06 D4 1 34949E 08 7 5 Temperature channel adjustment with Pt 100 simulators composite sensor Switch the power off and disconnect the wires to the Pt 100 sensor from solder lugs TP5 T...

Page 62: ...ature to be calibrated and adjust the second point gain to the reference reading 7 5 2 With LED commands Connect an ammeter voltmeter to the analogue outputs connector X2 Give command l and adjust the first point offset with arrow switches to the same reading with the reference and press ENT switch Set the Pt 100 simulator at the highest temperature to be calibrated and adjust the second point gai...

Page 63: ...erence or in checking the current output without disconnecting the analogue output from the process X2 OPENED COVER OF THE HMP 243 X15 CH2 CH1 CH1 CH1 CH2 CH2 Figure 7 5 Location of the CH1 and CH2 test points CH1 CH1 TEST POINTS CH1 CH1 mA RL X2 Figure 7 6 Circuit diagram of the analogue output current test points 7 7 Adjusting the contrast of the display The contrast of the display can be adjust...

Page 64: ...Dewpoint temperature typical range of dewpoint temperature 40 100 C Response time 90 at 20 C in 15 s still air with sintered filter 0 1 2 3 4 5 6 0 20 40 60 80 100 Dewpoint difference C Difference between ambient temperature and dewpoint temperature Accuracy in dewpoint measurement C 20 0 20 40 60 40 Dewpoint temperature C 100 80 Figure 8 1 Accuracy in dewpoint measurement as a function of depress...

Page 65: ...es of the meas ured quantities relative humidity and temperature In the dewpoint accuracy graph and accuracy tables for x a and Tw the accuracies of relative humidity and temperature are assumed to be 0 5 2 5 of the reading RH for humidity and 0 1 C for temperature at 25 C Note that the user can select whether the HMP240 calculates the frostpoint default or the dewpoint when the dewpoint is 0 C In...

Page 66: ...34 0 037 0 0 045 0 060 0 075 0 090 0 105 0 120 0 13 0 15 0 16 0 18 20 0 15 0 20 0 24 0 29 0 34 0 38 0 43 0 48 0 53 0 57 40 0 43 0 57 0 71 0 85 0 99 1 12 1 26 1 40 1 54 1 68 60 1 09 1 45 1 81 2 17 2 53 2 88 3 24 3 60 3 96 4 32 80 2 43 3 24 4 06 4 88 5 69 6 51 7 33 8 15 8 96 9 78 100 4 89 6 56 8 23 9 90 11 57 13 25 14 92 16 59 18 26 19 93 120 9 06 12 19 15 33 18 46 21 59 140 15 66 21 12 160 25 53 Ac...

Page 67: ... view angle LCD character height 3 85 mm 0 15 Keyboard 1 x 4 keypad Connections screw terminals 0 5 mm2 wires AWG 20 stranded wires recommended Operating voltage 24 VDC 24 VAC see Chapter 3 4 1 20 28 V Power consumption 200 mA maximum 24 VDC during re gaining 270 mA maximum 24 VDC Recommended external load for current outputs 500 Ω 0 1 V voltage output 2 kΩ to ground 0 5 and 0 10 V voltage outputs...

Page 68: ...or 7 10 mm diameter cable 8 x 0 5 mm2 shielded cable Sensor protection stainless steel sintered filter part no 16452 PPS grid with stainless steel netting part no 16720 Housing dimensions 145 x 120 x 65 mm Sensor head dimensions cable length 2000 5000 or 10000mm 29 70 Figure 8 2 HMP243 RH sensor head dimensions 5000 or 10000mm cable length 2000 ø 3 1 ø6 ø 5 5 64 93 Figure 8 3 HMP243 T sensor head ...

Page 69: ...ndard EN 61326 1 1997 Am 1 1998 Electrical equipment for measurement control and laboratory use EMC requirements Industrial environment Filters of the sensor PPS grid stainless steel netting filter 16720 and sintered steel filter 16452 Test methods Emission Radiated emissions CISPR16 class B CISPR22 Class B Harmonic currents to AC mains EN IEC 61000 3 2 Voltage fluctuations EN IEC 61000 3 3 Immuni...

Page 70: ...e 16452 Sintered filter stainless steel 16720 PPS grid with stainless steel netting HUMICAP KC Composite humidity and temperature sensor 16611 Calibration adapter for the HMK13B Calibrator HMP240RS RS 485 422 serial module HMP247CG Cable gland for HMP243 and HMP247 HMP247TBS Thread bar set for HMP247 HMP240CL Current loop module ...

Page 71: ...S 73 3 OUTPUT VIA THE SERIAL BUS 77 3 1 Operation modes 84 4 OTHERS 86 The commands function as described when the serial interface is in full duplex mode and echo is on All commands except FORM can be given in either capital or small letters In the commands cr means carriage return lf line feed and ht hori zontal tabulation ...

Page 72: ...e bb bbb cc ccc ee eee and ff fff parameters are entered in volts or milli amperes Sets the analogue outputs on channels 1 and 2 An example of this is when the voltage output on channel 1 is set to be 0 1 V and channel 2 set to 2 10 V AMODE U 0 1 U 2 10 cr Ch1 0 000 1 000 V Ch2 2 000 10 000 V The current settings can be checked by giving the command without any pa rameters AMODE cr Ch1 0 000 20 00...

Page 73: ...o 40 000 C Ch2 T hi 160 000 C The outputs and their scales can also be given directly with the ASEL com mand ASEL xxx yyy aaa a bbb b ccc c ddd d cr xxx channel 1 s quantity yyy channel 2 s quantity aaa a lower limit of channel 1 bbb b upper limit of channel 1 ccc c lower limit of channel 2 ddd d upper limit of channel 2 ASCL Scaling the analogue outputs Disconnect the security lock jumper ASCL cr...

Page 74: ...dd d cr aaa a lower limit of channel 1 bbb b upper limit of channel 1 ccc c lower limit of channel 2 ddd d upper limit of channel 2 For example when relative humidity is scaled to 0 100 RH on channel 1 and temperature to 40 100 C on channel 2 ASCL 0 100 40 100 cr Ch1 RH lo 0 000 RH Ch1 RH hi 100 000 RH Ch2 T lo 40 000 C Ch2 T hi 100 000 C ...

Page 75: ...e Ref2 prompt is acknowledged with cr CRH cr RH 12 80 Ref1 11 3 cr Press any key when ready RH 75 50 Ref2 cr If the stabilization of the sensor to the humidity in the calibrator needs to be monitored the measurement output can be repeated by giving command c cr at Ref1 and Ref2 CRH cr RH 12 00 Ref1 c cr RH 11 70 Ref1 c cr RH 11 50 Ref1 11 3 cr Press any key when ready RH 76 00 Ref2 75 5 cr FCRH Re...

Page 76: ...cr CT Temperature calibration of the humidity sensor head Disconnect the security lock jumper CT cr With this command the humidity sensor head can be calibrated against an accurate reference such as a Pt 100 simulator A two point calibration is per formed as follows CT cr T 0 80 Ref1 0 0 cr Press any key when ready T 56 20 Ref2 55 0 cr In one point offset correction the Ref2 prompt is acknowledged...

Page 77: ...ady Ta 75 50 Ref2 cr If the stabilization of the sensor to the temperature of the calibrator or the ref erence needs to be monitored the measurement output can be repeated by giv ing command c cr at Ref1 and Ref2 CTA cr Ta 0 80 Ref1 c cr Ta 0 40 Ref1 0 00 cr Press any key when ready Ta 56 20 Ref2 55 0 cr ACAL Calibrating the analogue outputs Disconnect the security lock jumper ACAL cr Calibrates t...

Page 78: ...inear correction coefficients Disconnect the security lock jumper LI cr The LI command is one way of calibrating the transmitter LI cr RH offset 0 000 0 1 cr RH gain 1 000 cr Ts offset 0 000 cr Ts gain 1 000 Ta offset 0 000 0 05 Ta gain 1 000 where Ts temperature of the humidity sensor head Ta temperature of the temperature sensor head The factory settings are offset 0 and gain 1 The transmitter c...

Page 79: ... interface does not echo any commands the only command that can be used is S stop The output mode can be changed with command FORM S Stopping the measurement output S cr Ends the RUN state after this command all other commands are available SEND Outputting a reading once SEND cr in STOP mode or SEND aa cr in POLL mode aa address of the transmitter when more than one transmitter is connected to a s...

Page 80: ...easily find out the addresses of the transmitters The output when four transmitters with addresses 4 5 10 33 have been con nected to the serial bus dsend cr 4 14 43 RH 5 22 7 C 10 14 99 RH 33 22 3 C ERRS Outputting error messages ERRS cr During operation error messages are not automatically output through the se rial interface If there is any reason to doubt that there is something wrong with the ...

Page 81: ...o is on INTV Setting the output interval for the RUN mode INTV xxx yyy cr xxx output interval 0 255 0 no pause between outputs yyy unit s min or h Sets the output interval when the transmitter outputs measurement readings to a peripheral device For example the currently valid settings are output with INTV cr Output intrv 0 min When this is changed into 10 minutes the command is INTV 10 cr Output i...

Page 82: ...WW WW wet bulb temperature dd d dewpoint difference uu uu unit according to the preceding variable n line feed lf r carriage return cr t horizontal tabulation ht or tab For example format output UUU UU TT TT r 100 00 99 99 cr TTT T uu r n 15 2 C cr lf UUU U uuu DD D uu r 46 9 RH 10 8 C cr Any text can be written in the command and it appears in the output For ex ample RH UUU U T TT TT r RH 54 0 T ...

Page 83: ... time ON intv 5 s setting the output interval Output intrv 5 s r 09 31 13 RH 19 4 RH T 26 0 C 09 31 18 RH 19 4 RH T 26 0 C 09 31 23 RH 19 8 RH T 26 0 C 09 31 28 RH 19 6 RH T 26 0 C 09 31 33 RH 19 5 RH T 26 0 C 09 31 38 RH 19 5 RH T 26 0 C Inactivating the time output ftime off Form time OFF r RH 19 4 RH T 26 1 C RH 19 8 RH T 26 1 C RH 20 6 RH T 26 1 C RH 20 5 RH T 26 1 C RH 19 9 RH T 26 1 C RH 19 ...

Page 84: ... RH T 26 0 C RH 19 7 RH T 26 0 C RH 19 7 RH T 26 0 C SERI Serial bus settings SERI b p d s x cr b bauds 300 600 1200 2400 4800 9600 p parity n none e even o odd d data bits 7 or 8 s stop bits 1 or 2 x duplex H half F full Giving the command on its own outputs the current settings SERI cr 4800 E 7 1 FDX The settings can be changed one parameter at a time or all parameters at once SERI O H cr changi...

Page 85: ...is on UNIT Selecting the output units UNIT x cr x m etric units n on metric units metric units non metric units RH RH RH T C F Td C F dT C F a g m3 gr ft3 x g kg gr lb Tw C F For example the command for setting the non metric units is UNIT N cr Output units non metric When the command is given with no parameters the transmitter outputs the currently valid setting ADDR Setting the transmitter addre...

Page 86: ...FF for dewpoint calculations For example Frost cr Frost ON Frost off Frost OFF Frost on Frost on RESET Resetting the transmitter RESET cr Resets the transmitter All settings that have been changed remain in the mem ory even after reset or power failure 3 1 Operation modes SMODE Setting the serial interface SMODE xxxx cr xxxx STOP RUN or POLL In STOP mode measurements output only by command all com...

Page 87: ...f the transmitter 0 99 CLOSE cr In STOP mode command OPEN has no effect CLOSE sets the transmitter in POLL mode In POLL mode command OPEN sets the transmitter temporarily in STOP mode command CLOSE returns the instrument to POLL mode When more than one transmitter is connected to the same serial bus the POLL mode makes it possible to communicate with the transmitters For example a relative humidit...

Page 88: ...ltage in mA or V The other four figures contain information for service purposes only Examples reading the channel outputs and parameters itest cr 1 9438 2 3483 1 00694 10 64634 1 97374 2 17665 forcing outputs 0 5 V and 4 V to channels 1 and 2 itest 0 5 4 cr 0 5000 4 0000 1 00694 10 62970 1 23336 3 01722 releasing the forced control and reading the outputs itest cr 1 9427 2 3392 1 00731 10 62428 1...

Page 89: ...d only when the ambient pressure is taken into consideration The pressure is used for pressure compensation of the HUMICAP sensor in order to ensure the best possible measurement accuracy When the command is given the transmitter first gives the currently used pressure after this a new value can be entered or the old one acknowledged PRES cr Pressure 1013 25 1000 00 cr When the currently used pres...

Page 90: ...ommand PRES is valid again CDATE Entering calibration date CDATE xxxxxx cr xxxxxx calibration date 000101 991231 When the latest calibration date has to kept in memory it is entered as fol lows CDATE 940506 cr If the command is given without the date the transmitter outputs the latest calibration already in memory CDATE cr 940420 The date can be given in any format however the maximum number of di...

Page 91: ... HMP 240 x yy where x yy is the programme version Outputting the transmitter settings cr For example cr HMP 240 1 02 CPU serial nr 0 Keyboard type 0 Address 7 Output units metric Baud P D S 4800 E 7 1 FDX Serial mode STOP Output intrv 0 min Mtim 32 Pressure 1013 25 Analog outputs Ch1 0 00 10 00 V Ch2 0 00 10 00 V Ch1 RH lo 0 000 RH Ch1 RH hi 100 000 RH Ch2 T lo 20 000 C Ch2 T hi 180 000 C Transduc...

Page 92: ...the same information as command but it works also when the transmitter has been set to POLL mode However if there are more than one addressed transmitters connected to the serial bus they all will re spond at the same time and the output on the screen will be chaotic ...

Page 93: ... AND USING THE RS 485 422 SERIAL PORT MODULE 1 INSTALLATION 92 2 OPERATION 93 3 NETWORK CONFIGURATION 95 3 1 Single loop operation 95 3 2 Dual loop operation 97 4 CHECKING THE SERIAL PORT NETWORK OPERATION 99 STOP mode 99 POLL mode 100 RS 485 network settings 100 5 SPECIFICATIONS 101 ...

Page 94: ...X2 24 V Ch1 Ch2 RX GND TX R 2 R 3 R 4 X6 RX HI RXLO TXLO TXHI X4 X5 RS485 422 R X T X X1 X2 HI H I L O LO X1 X2 R3 R6 Jumper selections for the RS 485 422 serial bus module Single pair Dual pair serial bus module Cut off the resistors R2 R3 and R4 on the main board New signal names for X6 screw terminal are on the module Follow the instructions on the module X1 to X4 and X2 to X5 on the mother boa...

Page 95: ... of the serial line there must be an HMP240 transmitter dynamic line adapter 120 ohm resistor in series with a 33 nF capacitor or line master If a branch line is made with a junction box the branch should be shorter than 3 meters When connecting the device follow the instructions given in the figure in Chapter 1 T XHI T XLO TWISTED PAIR WIRING HOST COMPUTER DUAL LOOP WIRING TWISTED PAIR WIRING HOS...

Page 96: ...on the lines when no data is transferred idling Both lines are terminated with a 120 ohm resistor in series with a 33 nF capacitor When operating the transmitter through a single pair only one line terminal impedance is in use The line must not be terminated with a resistor alone as the power consumption increases too much The data lines can withstand short circuit to ground and to each other They...

Page 97: ...work prevents common mode voltages from rising too high over 7 V Connect wires to the transmitter s serial connector Check the wiring The following procedure must be repeated with all transmitters Open the transmitter cover Pull out the RS 485 422 serial port module if it is already mounted Set the serial port of the terminal to 4800 baud even parity seven data bits and one stop bit full duplex 48...

Page 98: ...E 7 1 HDX Set the transmitter in POLL mode smode poll Serial mode POLL NOTE 1 The SMODE command must be given last NOTE 2 The transmitter outputs no prompt after the SMODE POLL command and it only reacts to commands which include its address Check that the transmitter responds to its address send 22 RH 24 4 RH T 29 1 C Disconnect the terminal Check that the jumpers in connector X4 are in the right...

Page 99: ...y settings have been changed they must be returned Connect the RS 232C port of the terminal to connector X17 on the top of the main board and switch the power on When dual loop is used the jumpers in connector X4 on the module board must be as shown below X4 X4 X1 X2 Set the address of the transmitter you can choose any number between 1 and 99 In this example the address is 22 addr 22 Address 22 S...

Page 100: ...lude its address Check that the transmitter responds to its address send 22 RH 24 4 RH T 29 1 C Disconnect the terminal Check that the jumpers in connector X4 are in the right place X4 X4 X1 X2 Remount the RS 485 422 serial module Close the cover Repeat this setting procedure with each transmitter When all transmitters on the network have been configured switch them off ...

Page 101: ...STOP mode it accepts com mands sent without address until CLOSE command is given Individual set tings can now be easily modified Do not open more than one line at a time Use command to find out the settings of the active transmitter cr HMP 240 1 02 CPU serial nr 0 Keyboard type 0 Address 7 Output units metric Baud P D S 4800 E 7 1 FDX Serial mode STOP Output intrv 0 min Mtim 32 Pressure 1013 25 An...

Page 102: ... can use different baud rates with different devices this makes it possible to use the same address for several devices The line terminations must be dynamic e g an RC circuit is used instead of a simple resistor termination Each RS 485 module has a dynamic line termina tion so it can be used at the end of a line 4 3 RS 485 network settings HMP240 settings Single pair Dual pair Full duplex half du...

Page 103: ... plug in module Board dimensions 40 x 28 mm Operating mode half duplex single or dual pair wiring Network network type daisy chain cable type twisted pair line length max 1000 m 3000 ft number of devices 32 devices on line data speed 9600 baud max for HMP240 transmitters operating mode polling mode common mode voltage range 7 V Operating temperature 40 60 C Storage temperature 40 70 C ...

Page 104: ...or X5 RX GND TX R2 R3 R4 X6 RX TX X4 X5 Current loop module X1 X2 DATA LOOPS TX RX X17 Connect the data wires to screw terminal X6 on the main board Switch the power on OPERATION The HMP240 transmitter can either be given an address or operated without an address Both single and dual loop wiring with half duplex connection can be used No address is needed when only one HMP240 transmitter is used w...

Page 105: ...43 TYPE TRANSMITTERS 1 TO N PIECES NOTE HALF DUPLEX DATA TRANSFER HMP 230 DOES NOT RECEIVE WHILE TRANSMITTING VIA SERIAL PORT MODULE RX RX TX TX RX RX TX TX RX RX TX TX RX RX TX TX RX RX TX TX RX RX TX TX The digital current loop module has separate lines for transmitting and receiv ing Both single loop wiring and dual loop wiring can be used see figure With dual loop connection it is possible to ...

Page 106: ...loop operation Bi directional data on one pair and galvanic isolation are the advantages of the current loop Single pair dual pair use is configured through wiring see figure on previous page Supplying power from the same end to the loops prevents crossover voltages Connect wires to the transmitter s serial connector Check the wiring The following procedure must be repeated with all transmitters O...

Page 107: ... SMODE command must be given last NOTE 2 The transmitter outputs no prompt after the SMODE POLL command and it only reacts to commands which include its address Check that the transmitter responds to its address send 22 RH 24 4 RH T 29 1 C Disconnect the terminal Remount the digital current loop module Close the cover When all transmitters on the network have been configured switch them off Dual l...

Page 108: ...itch the power on RX GND TX X17 Dual loop wiring Set the address of the transmitter you can choose any number between 1 and 99 In this example the address is 22 addr 22 Address 22 Set the serial bus settings according to your system This setting will become valid after next RESET or power off seri 2400 e 7 1 f 2400 E 7 1 FDX Switch echo on echo on ECHO ON Change the serial output mode into POLL sm...

Page 109: ...ith command OPEN commands can then be given without address When the line to the transmitter is closed it returns to POLL mode STOP mode Open the line to the transmitter open 22 cr HMP 22 line opened for operator commands Transmitter no 22 is now temporarily set to STOP mode it accepts com mands without address until CLOSE command is given Individual settings can now be easily modified Do not open...

Page 110: ...rrent loop standard current flows with no transmission on line A maximum of 6 devices can be connected on same single loop line but the number can be increased to 9 by using dual loop wiring More than one baud rate can be used on a current loop line E g the host of the line can use different baud rates with different devices this makes it pos sible to use the same address for several devices Curre...

Page 111: ...2 mA mark 30 mA max Connections Berg sockets on the main board screw terminals 0 5 mm wires stranded wires recommended Assembly plug in module Board dimensions 40 x 28 mm Operating mode half duplex single or dual pair wiring Network network type serial daisy chain cable type twisted pair line length max 1000 m 3000 ft number of devices 6 devices on line single loop 9 devices on line dual loop data...

Page 112: ...HMP240 Appendix 6 HMP243 wiring diagram M210300en 110 APPENDIX 4 ERROR MESSAGES 1 1 Errors after reset 112 1 2 Errors during operation 113 ...

Page 113: ...A The error messages can be divided into two groups error messages after reset and error messages during operation LED symbols LED dark LED blinking l LED lit 1 1 Errors after reset Display Serial bus E11 CPU EEPROM ackn error the CPU hybrid is probably damaged Send the transmitter to Vaisala for repair E12 CPU EEPROM checksum error possibly due to an electrical disturbance an erroneous parameter ...

Page 114: ... down and then change it with command LI Return the previous value with command LI and give command RESET or turn the power off and then on again If the error message no longer appears check the transmitter reading and if it seems to be in order the transmitter can be taken into use again Should the message re appear repeatedly send the transmitter to Vaisala for repair The LEDs display these erro...

Page 115: ... sensor and its solderings Check the temperature measurement wires and their solderings on the component board TP5 TP6 TP7 and TP8 If you cannot find any faults send the transmitter to Vaisala for repair E43 f Rk1 out of range the temperature measurement cannot be completed Check the temperature sensor and its solderings Check the temperature measurement wires and their solderings on the component...

Page 116: ...tter to Vaisala for repair E48 f Uk2 out of range the measurement hybrid is probably damaged Send the transmitter to Vaisala for repair The LEDs display these error types as follows no frequency at all a frequency missing from the RH channel a frequency missing from the T channel The second error type indicates erroneous y values used in internal calcula tions Display Serial bus E51 T y value out ...

Page 117: ... humidity measurement cannot be completed Check the HUMICAP sensor and humidity measurement wires and their solderings on the component board TP9 TP10 and TP11 15 If you cannot find any faults send the transmitter to Vaisala for repair E54 U2 y value out of range the measurement hybrid is probably damaged Send the transmitter to Vaisala for repair The LEDs display these error types as follows RH c...

Page 118: ...p RH P ws ws 621 98 100 b g 2 absolute humidity a RH P t ws 216 68 100 273 2 a f 3 where Td dewpoint temperature C Pws partial pressure of saturated water vapour mbar RH relative humidity x mixing ratio g kg p atmospheric pressure mbar a absolute humidity g m3 t temperature C The partial pressure of water Pws is calculated using equation Θ 3 o i i iT C T 4 where T temperature in K Ci coefficients ...

Page 119: ...on temperature according to the follow ing table t A m Tn 0 50 C 6 1078 7 5000 237 3 50 100 C 5 9987 7 3313 229 1 100 150 C 5 8493 7 2756 225 0 150 180 C 6 2301 7 3033 230 0 When Td 0 and the transmitter is set to dewpoint calculation mode FROST OFF the parameters are as follows A 6 119866 m 7 926104 Tn 250 4138 When Td 0 and the transmitter is set to frostpoint calculation mode FROST ON the param...

Page 120: ...nt voltage Max load for mA outputs 500 ohm max 270 mA 24VDC X6 X1 Probe connections X2 1 2 3 4 4 3 2 1 2 1 X1 X6 Location of main board terminals X15 Replaced by Drawn Review Appr Design Replaces Scale id Title Arch no Serial Sheet docno Cooperator s Dwgno Rev Ltr Qty Change Reason ECOno Design DateReview DateAppr Work order Tool Qty pcs RX RX TX TX TX RX RS232 Digital cur rent loop RS485 HI LO LO...

Page 121: ...1 3 LED COMMANDS 122 4 DISPLAY KEYPAD COMMANDS 123 4 1 Re gaining parameters 123 4 2 Starting re gaining manually 124 5 SERIAL COMMANDS 125 REG Re gaining settings 125 CR Re gaining parameters 125 CRI Changing re gaining parameters 126 FST Displaying re gaining status 126 REGEN Starting re gaining manually 127 ...

Page 122: ...the humidity sensor Automatic re gaining if active takes place repeatedly with time intervals defined by the user Re gaining can also be started manually using either LED display keypad or serial commands Calibration values Humidity Re gaining Measured values after chemical exposure Calibration values Humidity Re gaining Output signal Figure 1 1 Decrease of the sensor gain due to an interfering ch...

Page 123: ...temperature and the ambient temperature measured before re gaining and the k parameter the power level the sensor is heated at The parameter values can be changed by the user however please note that it is necessary to remove the security lock jumper first The factory settings are Interval min 720 Duration s 120 Temp diff 0 50 Settl time s 240 k 95 00 The time interval between subsequent re gainin...

Page 124: ...nd down press switches marked with arrows in the printed board to find the command code and acknowledge it with the ENT switch The re gaining parameters stored in the transmitter memory are used When re gaining is over the LEDs are dark again OPENED COVER OF THE HMP 243 press switches LEDs UP DOWN ENT Location of the press switches and LEDs ...

Page 125: ...arameters The re gaining parameters are displayed in a sequence of status of the automatic re gaining re gaining interval duration of heating temperature difference settling time k parameter Each setting can be changed by entering a new parameter value using the arrow keys After the parameter sequence the menu Regen settings Regeneration is displayed again If you want to leave the parameters for t...

Page 126: ...ters are acknowledged or changed the same way When all the parameters have been changed or acknowledged the menu Regen settings Regeneration is displayed again 4 2 Starting re gaining manually To start re gaining manually select Regeneration and press ENT The following is displayed When the heating is completed or it has been aborted the settling period begins and the transmitter returns to the di...

Page 127: ...amples checking the current settings reg REG OFF automatic re gaining is inactive Interval min 720 Duration s 120 Temp diff 0 50 Settl time s 240 k 95 00 activating the automatic re gaining reg on REG ON deactivating the automatic re gaining reg off REG OFF 1 2 2CR Re gaining parameters CR cr Command CR can be used to check the values of re gaining parameters Example cr Interval min 720 Duration s...

Page 128: ... heating to 360 s cri Interval min 720 480 Duration s 120 Temp diff 0 50 Settl time s 240 360 k 95 00 NOTE To activate new parameter settings immediately command RESET must be given Otherwise the transmitter starts the re gaining with new parameters only when the old re gaining interval is completed 1 2 4FST Displaying re gaining status FST nnn cr nnn ON or OFF With FST ON the status of the re gai...

Page 129: ... 15 0 RH T 31 5 C N 163 RH 16 7 RH T 30 0 C N 163 RH 17 4 RH T 29 1 C H 160 RH 17 7 RH T 28 6 C H new heating new H 160 RH 17 7 RH T 28 6 C power deactivating status display fst off Form status OFF r RH 20 1 RH T 26 4 C RH 20 2 RH T 26 4 C RH 20 1 RH T 26 4 C RH 20 2 RH T 26 4 C 1 2 5REGEN Starting re gaining manually REGEN cr Re gaining can also be started manually with command REGEN The current ...

Page 130: ...62 RH 18 5 RH T 27 6 C outputs are released N 162 RH 18 8 RH T 27 5 C Re gaining can not be started if automatic re gaining heating cooling is on the temperature of the sensor exceeds 100 C or the security lock jumper is off In these cases the Regeneration started text is not output by the transmitter but the prompt appears immediately Example regen r forced re gaining failed H 162 RH 19 7 RH T 26...

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Vaisala HMP240 SERIES, User Manual

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