Vaisala HUMICAP HMP140A User`s guide
Contents
1. Mure n H 0 set 2 3 4 1 Humidity channel RH of Se A 4 20 set yA Numbers on the second line are blinking They indicate the current range of the the transmitter s RH channel currently stored in the HMI41 memory Select the range with buttons A or WV to correspond to that of the transmitter Acknowledge the selection with ENTER A text similar to the following is displayed RHM M MT LU LLS 00 set IL Numbers on the second line are blinking They indicate the lower limit of the transmitter s RH range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER TE ESA mm LULU og Numbers on the first line start to blink They indicate the upper limit of the transmitter s RH range currently stored in the HMI41 memory Text in the 1996 08 29 11 HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 lower righthand corner is Hi You can now set the upper limit to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER The HMI41 goes on to T channel settings and a text similar to the following is displayed De eee AW ee set 2 3 4 2 Temperature channel T s fis 4 00 set 4 Numbers on the second line are blinking They indicate the curr2. limit of the transmitter s voltage range currently stored in the HMI41 memory and the text in the lower righthand corner is Hi You can now set the upper limit of the voltage range to correspond to that of the transmitter Set the limit with buttons or V and acknowledge the setting with ENTER A text similar to the following is displayed RHIN 11 1 Us set AT Numbers on the second line are blinking They indicate the lower limit of the transmitter s RH range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit of the RH range to correspond to that of the transmitter Set the limit with buttons or V and acknowledge the setting with ENTER set Numbers on the first line start to blink They indicate the upper limit of the transmitter s RH range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit of the RH range to correspond to that of the transmitter Set the limit with buttons A or W and acknowledge the setting with ENTER The HMI41 goes on to T channel settings and a text similar to the following is displayed rnu UD 10 set 8 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual 1996 08 29 2 3 3 2 Temperature channel rnb ug g i 0 set Numbers on the second line are blinking They indicate the voltage range of the transmitter s T channel j
3. please consult Chapter 2 The default settings in the HMI41 memory Table 1 2 are returned with U I cU or cI selections according to which changes have been made Humidity range Temperature range Voltage range 0 100 RH 40 60 C Table 1 2 Default settings in the HMI41 memory 2 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual 2 OUTPUT SCALE SELECTIONS 2 1 Standard transmitter settings In Table 2 1 you will find the standard settings of the HMD W60 HMD W70 and the HMP140 series transmitters Transmitter Relative humidity Temperature Voltage Current output scaling range scaling range output HMP140 0 100 RH 40 60 C HMD60 0 100 RH 20 480 C ss 4 20 mA HMD70 0 100 RH 20 80 C HMW60 0 100 RH 5 455 C Ps 4 20 mA HMW70 0 100 RH Table 2 1 Standard settings of analogue transmitters NOTE When calibrating transmitters with current outputs make sure that the output loop is terminated 2 2 Getting started After having selected the calibrator function 2 as explained in Chapter 1 2 turn the HMI41 on with the ON OFF button and wait until the following text appears on the display RH SCALE This message remains on the display for about 5 seconds if no button is pressed the HMI41 goes on to calibration To enter the scale selections press any button except ON OFF within 5 seconds and the following appears 1996 0
4. the stabilization time depends on the ambient conditions and may vary from 10 minutes to a couple of hours Getting started After having selected the desired function Chapter 1 2 and necessary scale selections Chapter 2 turn the HMI41 off and connect the calibration cable to the EXT connector at the bottom of the HMI41 see Figure 3 1 and to the appropriate connector in the transmitter see Figures 3 2 3 4 f gi Connector for the calibration cable Figure 3 1 Location of the HMI41 calibration connector TEST CONNECTOR HMD6OU Y FOR CURRENT OUTPUTS HMD70U Y RH p TEST TEST CONNECTOR o FOR VOLTAGE OUTPUTS o RH OFFSET RH GAI L Ph RH OFFSET OO o oo TGAIN T OFFSET RH GAIN s do T GAIN T OFFSET Figure 3 2 Calibration connectors and potentiometers in the HMD60 and HMD70 transmitters HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 RH TEST TTEST X3 X4 T GAIN coos TEST LT CONNECTOR T OFFSET Ce e RH PRH OFFSET GAIN 9 T GAIN T OFFSET RH PH 2 OFFSET GAIN HMW6OU Y HMD70U Y Figure 3 3 Calibration connectors and potentiometers in the HMW60 and HMW70 transmitters Tgain P Toffset Test c
5. 8 29 3 HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 2 3 R a Dl U or Scale selection mode is entered when this text is on the display Scale selection modes The HMI41 has four scale selection modes voltage output U and current output I selection modes are used for transmitters with standard settings Customized voltage output cU and customized current output cI selection modes are meant for analogue transmitters with customized RH T and or output range settings All these selections are stored in the HMI41 memory therefore if the transmitter settings or the selections in the HMI41 memory have not been changed by the next calibration you can calibrate the transmitter directly In the following each selection mode is explained in its own section 2 3 1 Voltage output selection mode U IK Le ri w U ori If the transmitter has voltage outputs its temperature range is given to the HMI41 with the voltage output selection mode U The humidity range is always 0 100 RH Select the U selection mode with buttons or W and acknowledge the selection with ENTER A text similar to the following is displayed nn T b ULI lt T unane F U U set Lo Numbers on the second line are blinking They indicate the lower limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit with butt
6. VAISALA USER S GUIDE Calibration of Series HMD W60 70 and HMP140 Transmitters with Vaisala HUMICAP Indicator HMI41 U218EN11 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 2006 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 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual Contents APPENDIX 1 QUICK REFERENCE TO SCALE SELECTIONS AND CALIBRATION 1996 08 29 i HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 This page intentionally left blank il 1996 08 29 1 2 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual 1 INTRODUCTION 1 1 HMI41 with calibration option The HMI41 can be used as a field calibrator for various Vaisala humidity transmitters There are three different calibration cables available e 19116ZZ for the ca
7. annel s current output range 4 20 mA 0 20 mA Set the lower limit of the humidity range Set the upper limit of the humidity range Select the T channel s current output range 4 20 mA 0 20 mA Set the lower limit of the temperature range Set the upper limit of the temperature range A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection press ON OFF HMI41 Calibration Option Appendix 1 19116ZZ U218en 1 1 2 5 DISPLAY WHAT TO DO PRESS Calibration Wait for about 5 seconds Let the readings stabilize and then adjust the transmitter potentiometers until the readings are the same Alternatively you can calibrate the transmitter in the second RH calibration mode see below Let the readings stabilize and then adjust the transmitter potentiometers until the reading on the first line is at zero Let the readings stabilize and then adjust the transmitter offset potentiometer until the readings are the same Alternatively you can calibrate the t
8. ber up or Select the voltage output scale selection V number down mode U ENTER to acknowledge the selection A number up or Set the lower limit of the temperature V number down range ENTER to acknowledge the selection A number up or Set the upper limit of the temperature V number down range ENTER to acknowledge the selection ON OFF 2 1996 08 26 HMI41 Calibration Option 19116ZZ U218 1 1 Appendix 1 2 2 Current output scale selection mode I DISPLAY WHAT TO DO PRESS A number up or Select the current output scale selection V number down mode I ENTER to acknowledge the selection A number up or Select the output V number down 0 20 mA or 4 20 mA ENTER to acknowledge the selection A number up or Set the lower limit of the temperature V number down range ENTER to acknowledge the selection A number up or Set the upper limit of the temperature V number down range ENTER to acknowledge the selection ON OFF 1996 08 26 3 HMI41 Calibration Option Appendix 1 19116ZZ U218en 1 1 2 3 Customized voltage output selection mode cU DISPLAY WHAT TO DO PRESS Select the customized voltage output scale selection mode cU Select the jumper selected RH channel s voltage output range 0 1V 0 5V 0 10V Set the lower limit of the RH channel s voltage range Set the upper limit of the RH channel s voltage range Set the lower limit
9. ent range of the transmitter s T channel currently stored in the HMI41 memory Select the range with buttons A or W to correspond to that of the transmitter Acknowledge the selection with ENTER A text similar to the following is displayed nn T b LI LI lt T ynne TU set Lo Numbers on the second line are blinking They indicate the lower limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER m 7 4gp set Hi Numbers on the first line start to blink They indicate the upper limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit to correspond to that of the transmitter Set the limit with buttons or W and acknowledge the setting with ENTER Turn the HMI41 off with the ON OFF button You can now calibrate the transmitter Chapter 3 1996 08 29 3 1 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual CALIBRATION For a successful calibration it is essential that the probe of the HMI41 and that of the transmitter are at the same temperature and that the reference probe has been previously calibrated Always allow enough time for the readings to stabilize Note that
10. g is displayed HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 nn T b LI LI lt T unane TULL set Lo Numbers on the second line are blinking They indicate the lower limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit with buttons A number up or W number down to correspond to that of the transmitter Acknowledge the setting with ENTER r OU U T nine 400 set Hi Numbers on the first line start to blink They indicate the upper limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit with buttons A number up or V number down to correspond to that of the transmitter Acknowledge the setting with ENTER and turn the HMI41 off with the ON OFF button You can now calibrate the transmitter see Chapter 3 2 3 3 Customized voltage output selection mode cU The customized voltage output selection mode cU is selected when the scaling of the RH T and or voltage range is not a standard one N nt Cu U or Select the cU selection mode with buttons A or W and acknowledge the selection with ENTER A text similar to the following is displayed RH Fab K Fee of UO 10 y si se 6 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual 2 3 3 1 Hum
11. idity channel RH rnb ug g i 0 set Numbers on the display are blinking They indicate the voltage range of the transmitter s RH channel jumper selectable currently stored in the HMI41 memory Please consult Figures 2 3 1 2 3 2 when checking the transmitter s jumper positions RH output selections hd 0 1V 0 5V ee 0 10 V Figure 2 3 1 Jumper selections of the HMD W70 RH output selections i e le e 0 1V 0 5V 0 10V Figure 2 3 2 Jumper selections of the HMP140 Numbers on the second line are blinking and you can now select the range with buttons A or W according to the transmitter s jumper position Acknowledge the selection with ENTER A text similar to the following is displayed Mon IL Us Ls 11 nnn LJ MUU set Lo Numbers on the second line are blinking They indicate the lower limit of the transmitter s voltage range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit of the voltage range to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER 1996 08 29 7 HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 PHI nn UU US 1 nnn WI LULU set Hi Numbers on the first line start to blink They indicate the upper
12. libration of HMD W60 70 and HMP140 series analogue transmitters e 191647Z for the calibration of HMP230 series digital transmitters e 19165ZZ for the calibration of the HMD W20 30 and HMP130 series analogue transmitters In this manual only the calibration of the HMD W60 70 and HMP140 series analogue transmitters is dealt with For other calibration options please refer to corresponding manuals Calibration is quick and easy to perform Yet the HMI41 includes four output scale selection modes which cover all scalable features of analogue transmitters and provide for a simple and reliable on site calibration of even customized transmitters In calibration the HMI41 measures relative humidity and temperature with a separate probe and receives the RH and T information from the transmitter These values are then compared on the HMI41 display and the transmitter is adjusted with calibration potentiometers inside the transmitter Selecting the HMI41 calibrator function The desired calibrator function is selected in the HMI41 setup menu To enter the setup mode first press the ON OFF button and the following appears ar 0 0 4 ot BE B B A _setminmax hysthold LobatHi Then release the ON OFF button and within 1 2 seconds press both ENTER and MODE buttons until the following text appears on the display SEEU After a few seconds the text changes automatically to show the following HMI41 Calibration Option Opera
13. m that measured by the HMI41 reference probe Numbers on the second line indicate the temperature measured by the reference probe If you wish you can now adjust the transmitter by pressing the HOLD button again you will return to the previous T calibration mode and by pressing the MODE button you will return to the second RH calibration mode e Wait until the readings have stabilized and then adjust the calibration potentiometer Figures 3 2 3 4 until the numbers on the first line are at zero It is recommended to use the offset potentiometer e After having completed the calibration press ON OFF and disconnect the cable GUARANTEE Vaisala issues a guarantee for the material and workmanship of this product under normal operating conditions for one 1 year from the date of delivery Exceptional operating conditions damage due to careless handling and mis application will void the guarantee 1996 08 29 17 HMI41 Calibration Option 19116ZZ U218 1 1 Appendix 1 APPENDIX 1 QUICK REFERENCE TO SCALE SELECTIONS AND CALIBRATION It is recommended that this quick reference guide is used only as a checking list for those who already know how to operate the HMI41 as a calibrator For those who take it into use for the first time the Operating Manual gives useful information that is not included in this quick reference guide 1 Selecting the calibrator function For selecting the calibrator function press ON OFF until you can see so
14. me text on the display Then release the ON OFF button and press within 1 2 seconds both ENTER and MODE buttons until the text setup appears on the display Then follow the instructions of the table below DISPLAY WHAT TO DO PRESS Wait for a few seconds If the basic settings have been given press ENTER repeatedly press ENTER If they have not been given refer to the HMI41 Operating Manual select the HMI41 function 1 indicator A number up or 2 calibrator for HMD W60 70 and V number down HMP140 series analogue transmitters ON OFF 3 calibrator for HMP230 transmitters 4 calibrator for HMD W20 30 and HMP130 series transmitters 1996 08 26 1 HMI41 Calibration Option Appendix 1 19116ZZ U218en 1 1 2 Scale selection modes The HMI41 automatically assumes the function selected in the setup menu when it is turned on again with the ON OFF button In the following you will find a summary of the scale selection modes DISPLAY DESCRIPTION y B B B The HMI41 has been turned on 400000 setminmax hysthold LobatHi Indication of the software version if the version is 1 02 or more Indication of the battery voltage Press any button except ON OFF within 5 seconds to enter the scale selection modes Select the desired scale selection mode with buttons Aor W and acknowledge the selection with ENTER Then follow the instructions of tables 2 1 2 5 accordingly 2 1 A num
15. o equalize If the difference between the readings is less than 0 5 C make no adjustments When performing the temperature calibration of the HMD W60 transmitters make sure that the calibration cable is connected to the T test connector Figures 3 2 and 3 3 Temperature calibration is entered through the RH calibration modes see Chapter 3 2 By pressing MODE in the first RH calibration mode a text similar to the following is displayed CU 7 258 Numbers on the first line indicate the temperature measured by the transmitter and numbers on the second line indicate the temperature measured by the HMI41 If you wish you can now adjust the transmitter by pressing the MODE button you will return to the RH calibration mode e Wait until the readings have stabilized and then adjust the calibration potentiometer Figures 3 2 3 4 until the readings on the first and the second line are the same It is recommended to use the offset potentiometer e After having completed the calibration press ON OFF and disconnect the cable 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual If you press the HOLD button in the first T calibration mode you will go on to the second T calibration mode which is an alternative for the first one A text similar to the following is displayed X g mE T Lc 7 38 Numbers on the first line indicate how much the temperature measured by the transmitter differs fro
16. of the humidity range Set the upper limit of the humidity range Select the jumper selected T channel s voltage output range 0 1V 0 5V 0 10V Set the lower limit of the T channel s voltage range Set the upper limit of the T channel s voltage range Set the lower limit of the temperature range Set the upper limit of the temperature range A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or VY number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection A number up or V number down ENTER to acknowledge the selection press ON OFF 1996 08 26 191162Z U218 1 1 2 4 HMI41 Calibration Option Appendix 1 Customized current output selection mode cl DISPLAY WHAT TO DO PRESS 1996 08 26 Select the customized current output scale selection mode cl Select the RH ch
17. onnector for voltage outputs l RHoffset Test connector for F P current outputs i 5 aan Current Module Figure 3 4 Calibration connectors and potentiometers in the HMP140 series transmitters 14 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual 3 2 1996 08 29 Humidity calibration When performing the humidity calibration of the HMD W60 transmitters make sure that the calibration cable is connected to the RH test connector Figures 3 2 and 3 3 After having connected the cable turn the HMI41 on with the ON OFF button and wait until the following text appears on the display RH SCALE This message remains on the display for about 5 seconds Press no button when this text is displayed and the HMI41 will automatically go on to calibration a text similar to the following appears PH 7 2 16 9 Numbers on the first line indicate the relative humidity measured by the transmitter and numbers on the second line indicate the RH measured by the HMI41 reference probe If you wish you can now adjust the transmitter e Wait until the readings have stabilized and adjust the calibration potentiometers Figures 3 2 3 4 until the readings on the first and the second line are the same It is recommended to use the offset potentiometer if the RH is lt 65 RH and the gain potentiometer if the RH is gt 65 RH e After having completed the calibration press MODE if you
18. ons number up or V number down to correspond to that of the transmitter Acknowledge the setting with ENTER 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual amp nn T LI Dc A T _LNMNC 40i set Hi 1996 08 29 Numbers on the first line start to blink They indicate the upper limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit with buttons number up or V number down to correspond to that of the transmitter Acknowledge the setting with ENTER and turn the HMI41 off with the ON OFF button You can now calibrate the transmitter see Chapter 3 2 3 2 Current output selection mode l NOTE When calibrating the transmitters with current outputs make sure that the output loop is terminated 7 ra U ori If the transmitter has current outputs its temperature range is given to the HMI41 with the current output selection mode 1 The RH range is always 0 100 RH Select the I selection mode with buttons A or W and acknowledge the selection with ENTER A text similar to the following is displayed l NOR aa H 0 set Numbers on the display are blinking and you can now select the output 0 20 or 4 20 mA with buttons A or W according to the transmitter to be calibrated Acknowledge the selection with ENTER and a text similar to the followin
19. owledge the setting with ENTER A text similar to the following is displayed B U T 400 set Numbers on the second line are blinking They indicate the lower limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER 60 Us T 4gp ne set Hi Numbers on the first line start to blink They indicate the upper limit of the transmitter s temperature range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit to correspond to that of the transmitter Set the limit with buttons A or V and acknowledge the setting with ENTER Turn the HMI41 off with the ON OFF button You can now calibrate the transmitter see Chapter 3 2 3 4 Customized current output selection mode cl The customized current output selection mode cl is selected when the scaling of the RH T and or current range is not a standard one NOTE When calibrating transmitters with current outputs make sure that the output loop is terminated 1996 08 29 HMI41 Calibration Option 19116ZZ U218en 1 1 Operating Manual c U or Select the cI selection mode with buttons A or W and acknowledge the selection with ENTER A text similar to the following is displayed eu
20. ransmitter in the second T calibration mode see below Let the readings stabilize and then adjust the transmitter offset potentiometer until the reading on the first line is at zero HOLD to enter the second RH calibration mode MODE to enter the first T calibration mode ON OFF if you have completed the calibration HOLD to return to the first RH calibration mode MODE to enter the second T calibration mode ON OFF if you have completed the calibration HOLD to enter the second T calibration mode MODE to return to the first RH calibration mode ON OFF if you have completed the calibration HOLD to return to the first T calibration mode MODE to return to the second RH calibration mode ON OFF if you have completed the calibration 1996 08 26 www vaisala com U2 18 EN
21. ting Manual 19116ZZ U218en 1 1 m LJ c Un E set If the basic settings of the HMI41 display units automatic power off function display quantities and pressure have to be changed please refer to the HMI41 Operating Manual Otherwise press ENTER repeatedly until the following text appears I _SEArE Ss The number on the first line of the display corresponds to the following HMI41 functions 1 HMI41 as a humidity and temperature indicator 2 HMI41 as a calibrator for HMD W60 70 and HMP140 series analogue transmitters 3 HMI41 as a calibrator for HMP230 series digital transmitters 4 HMI41 as a calibrator for the HMD W20 30 and HMP130 series analogue transmitters To calibrate the HMD W60 70 or the HMP140 series transmitters select number 2 with buttons A number up and V number down and then turn the HMI41 off When the HMI41 is turned on again it will automatically wake up as a calibrator for these analogue transmitters If you wish to calibrate transmitters of some other type or use the HMI41 as an indicator this selection has to be done accordingly refer to corresponding manuals for further details Note that if the default settings in the HMI41 memory have not been changed e g when it is used as a calibrator for the first time the HMP140 series transmitters with standard settings and voltage outputs can be directly calibrated see Chapter 3 In all other cases scale selections are necessary
22. umper selectable currently stored in the HMI41 memory Please consult Figures 2 3 3 2 3 4 when checking the transmitter s jumper positions T output selections e 0 1V ee 0 5V ee 0 10 V Figure 2 3 3 Jumper selections for the HMD W70 T output selections e 0 1V e 0 5V ee 0 10 V Figure 2 3 4 Jumper selections for the HMP140 You can now set the range with buttons or W to correspond to the jumper position Acknowledge the setting with ENTER A text similar to the following is displayed mnM UUU uy 000 set o Numbers on the second line are blinking They indicate the lower limit of the transmitter s voltage range currently stored in the HMI41 memory Text in the lower righthand corner is Lo You can now set the lower limit with buttons A or Y to correspond to that of the transmitter Acknowledge the selection with ENTER A text similar to the following is displayed HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 LA BEZ mnn JU VU Th ANN UW LULU set Hi Numbers on the first line start to blink They indicate the upper limit of the transmitter s voltage range currently stored in the HMI41 memory Text in the lower righthand corner is Hi You can now set the upper limit with buttons A or V to correspond to that of the transmitter Ackn
23. wish to perform a temperature calibration see next page or ON OFF disconnect the cable If you press the HOLD button in the first RH calibration mode you will go on to the second RH calibration mode which is an alternative for the first one A text similar to the following is displayed ARH 7 16 9 HMI41 Calibration Option Operating Manual 19116ZZ U218en 1 1 3 3 Numbers on the first line indicate how much the RH measured by the transmitter differs from that measured by the HMI41 reference probe Numbers on the second line indicate the relative humidity measured by the reference probe If you wish you can now adjust the transmitter by pressing HOLD again you will return to the previous RH calibration mode e Wait until the readings have stabilized and adjust the calibration potentiometers Figures 3 2 3 4 until the numbers on the first line are at zero It is recommended to use the offset potentiometer if the RH is lt 65 RH and the gain potentiometer if the RH is gt 65 RH e After having completed the calibration press MODE if you wish to perform a temperature calibration see below or ON OFF disconnect the cable Temperature calibration As the temperature sensor is extremely stable temperature calibration should be used for check ups only Before starting the temperature calibration leave the transmitter and the HMI41 to the same room at least for an hour so that their temperatures have enough time t
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