Vaisala HUMICAP HMP41, User Manual

Page 1: ...USER S GUIDE Vaisala HUMICAP Indicator HMI41 and Probes HMP41 45 46 M210316EN A ...

Page 2: ...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...

Page 3: ...ng 21 6 3 Setting the measurement duration 22 6 4 Setting the measurement interval 22 6 5 Reading the measurement results 23 7 TRANSFERRING THE STORED READINGS TO A PC 26 7 1 Giving the communication parameters 26 7 2 Transferring the data 29 8 CHANGING THE SETTINGS 33 8 1 Entering the setup mode 33 8 2 Selecting the display units 34 8 3 Setting the automatic power off function 34 8 4 Selecting th...

Page 4: ... Trouble shooting 39 10 2 Checking the settings 40 11 TECHNICAL DATA 41 11 1 HMI41 indicator 41 11 2 HMP41and HMP45 probes 42 11 3 HMP46 probe 43 11 4 Accuracy of the calculated quantities 44 11 5 Electromagnetic compatibility 47 APPENDIX 1 QUICK REFERENCE GUIDE 48 WARRANTY 65 ...

Page 5: ...ion as indicators marked with ID recognize automati cally all versions of this probe All probe types are optimized for different applications HMP41 probe can be used for measuring humidity and temperature in various applications for example in spot checks HMP42 probe head has a diameter of only 4 mm and is 23 5 cm long This probe structure is specially indicated for measurements in very tight plac...

Page 6: ...be either automatic or manual and it can be optimized for each application both the measurement interval and duration can be set by the user During automatic data collecting the probe takes measurements only just before storing each measurement In order to minimize the consumption and to maximize the battery life the power is automatically turned off for the measurement interval and the display is...

Page 7: ...nd the humidity is high Although the humidity sensor reacts rapidly to changes in the amount of water vapour in the air the probe temperature changes more slowly To avoid errors caused by temperature differences the probe must always be left to stabilize to ambient temperature before starting measurements the bigger the temperature difference the longer the stabilization time Indoors relative humi...

Page 8: ...close the lid carefully 3 2 Connecting the probes After having inserted the batteries connect the probe you wish to use The HMP41 is connected to the connector on top of the HMI41 remove the plastic plug and mount the probe see Figure 3 2 The HMP45 and the HMP46 both have a cable to be plugged into the connector at the bottom of the HMI41 marked PROBE see Figure 3 2 The other connector is for cali...

Page 9: ...y connected If the software version does not appear it is smaller than 1 02 and the indicator cannot be used with the HMP46 probe If the probe type does not appear the indicator or the probe is of a previous version and the automatic recognition is not possible give the setting manually see Chapter 8 After a couple of seconds the battery voltage appears on the display with an indication of the bat...

Page 10: ...re Td reading is displayed T Td C C When MODE is pressed again one of the following is displayed or the HMI41 returns to showing the RH and T readings according to what has been chosen for the measurement quantities see Chapter 8 4 abs g m T C Temperature and absolute humidity T C C Temperature and wet bulb temperature the arrow in the lower righthand corner indicates that wet bulb temperature has...

Page 11: ...t ON OFF 4 3 1 MIN mode If you wish to know the minimum readings that have been measured after power up press HOLD when the indicator is in the HOLD mode The minimum readings of the currently displayed quantities are shown if the hold text is blinking the HMI41 must first be returned to the normal display mode in order to activate the MIN mode see Chapter 4 3 RH min T C With MODE or ENTER the indi...

Page 12: ...cated under a protective plug The potentiometer marked T temperature is for factory use only DO NOT make any adjustments To make sure that this potentiometer is not accidentally touched when adjusting the other two turn the plastic plug aside without removing it completely see Figure 5 1 1 For adjusting the potentiometers use a trimming wrench provided with the probe or some other suitable tool e ...

Page 13: ... use a suitable trimming screw wrench see Figure 5 1 1 Insert the thermometer into the 13 5 mm hole of the NaCl salt chamber and the probe into another hole of the NaCl chamber NOTE When calibrating probes that are being used for long term measurements over 1 hour in high humidities 90 100 RH use the K2SO4 salt as the high end reference Wait until the humidity reading stabilizes Read the salt cham...

Page 14: ...e by adjusting the probe potentiometers Note that when the sensor is changed calibration must always be done by adjusting the potentiometers and it is recommended that the HMI41 is reverted to factory settings by selecting default calibration NOTE If the factory calibration of the HMI41 is changed the correction data refers to the calibrated probe only Therefore if you change the probe always reve...

Page 15: ...ty calibration at two points See Chapter 5 2 2 for further details set T One point temperature calibration select this for performing temperature calibration at one point See Chapter 5 2 3 for further details set T Two point temperature calibration select this for performing temperature calibration at two points See Chapter 5 2 4 for further details 5 2 1 One point humidity calibration In one poin...

Page 16: ... humidity value in the calibration table and adjust the display with buttons and to correspond to the value given in the table For example if the temperature in the calibrator s NaCl salt chamber is 20 5 C adjust the value to 75 5 RH RH set Each time the button is pressed the value changes with 0 1 If you keep the button pressed the value changes in a faster mode Press ENTER and the HMI41 indicato...

Page 17: ...ome other text may appear e g too close err offst or err gain the correction has not been stored in the memory The error may be due to an incorrect reference value or to measured values that are out of the range 5 2 2 Two point humidity calibration In two point humidity calibration two accurate references e g the HMK15 Calibrator are needed Leave the reference instrument and the probe at the calib...

Page 18: ...nd the HMI41 shows the value that the probe is currently measuring displaying a message similar to the following RH Lo Wait at least ten minutes for the reading to stabilize and press ENTER to acknowledge the value Press ENTER again to conclude the lower point calibration A message similar to the following appears with the first line blinking RH set Hi The blinking number indicates the value of th...

Page 19: ...the display units and can be turned off When the indicator is used as a standard indicator and the correction data differs from the factory settings an arrow in the upper righthand corner is displayed RH T C If the message cal pass does not appear instead some other text may appear e g too close err offst or err gain the correction has not been stored in the memory The error may be due to an incor...

Page 20: ...value stored in the HMI41 memory Check the actual temperature reference and change the display with buttons and to correspond to the accurate value for example set T C Press ENTER and the HMI41 indicator shows the value that the probe is currently measuring displaying a message similar to the following T C Wait at least ten minutes for the reading to stabilize and press ENTER to acknowledge the va...

Page 21: ...has not been stored in the memory The error may be due to an incorrect reference value or to measured values that are out of the range 5 2 4 Two point temperature calibration In two point temperature calibration two accurate temperature references are needed Note that you must allow enough time for all instruments to stabilize to the temperature equilibrium Start the calibration by inserting the p...

Page 22: ...llowing Lo T C Wait at least ten minutes for the reading to stabilize and press ENTER to acknowledge the value Press ENTER again to conclude the lower point calibration A message similar to the following appears with the first line blinking set Hi T C The blinking number indicates the value of the higher temperature reference stored in the HMI41 memory Insert the probe to the higher reference temp...

Page 23: ...MI41 memory The HMI41 returns automatically to the selection of the display units and can be turned off When the indicator is used as a standard indicator and the correction data differs from the factory settings an arrow in the upper righthand corner is displayed RH T C If the message cal pass does not appear instead some other text may appear e g too close err offst or err gain the correction ha...

Page 24: ...ollowing appears for a couple of seconds RH set min max hyst hold Lo bat Hi P Pa h g m T Td C F C F Release the ON OFF button and press immediately the button HOLD The software version and the probe type indication appear after which the display changes automatically to show the battery charge bat Hi Within a couple of seconds the text REC AUTO appears on the display release the HOLD button This i...

Page 25: ...e readings at appropriate intervals by pressing the button HOLD Each time you store a reading its sequence number in the indicator memory appears for a couple of seconds The indicator returns automatically to show the readings You can store 199 measurement readings in the indicator memory numbers 1 199 In automatic data collecting you can store 200 readings 0 199 End data collecting by turning the...

Page 26: ...n be set from 15 minutes to 7 days The batteries last for 7 days during data collecting provided that they are of the same type as those delivered with the indicator Set the duration with buttons and The duration time can be selected in steps according to the following 15 min 30 min 1 6 h each pressing 1 h 12 h 1 7 d each pressing 1 d If the duration selected is too long for the current battery ch...

Page 27: ...the display are updated once a minute and the display is dim except during this updating in order to minimize the consumption If the indicator is turned off the measurements stored so far remain in the memory and they can be read by turning the indicator on in the REC READ mode see section 6 5 You can end the data collecting by pressing ON OFF 6 5 Reading the measurement results The measurement re...

Page 28: ...the decimals press ENTER The reading appears on the display with one decimal RH T C In a couple of seconds the indicator returns to the previous display Press MODE to change the quantity on the first line T Td C C If you press ENTER with any quantity on the first line an arrow appears on the higher right hand corner of the display RH T C Press HOLD while the arrow is displayed to scroll the measur...

Page 29: ...observing the minimum reading of the quantity on the first line By pressing HOLD repeatedly you can change from one display mode to another and by pressing MODE you can change the quantity on the first line In all these modes the decimals of the second line reading are shown by pressing the button ENTER Examples HOLD HOLD HOLD ENTER RH min Hi T C minimum reading of the 1st line quantity decimals o...

Page 30: ...Giving the communication parameters Give the communication parameters when using this terminal session for the first time save them for future use See instructions in the following tables Table 7 1 1 Giving parameters in Windows 3 1 MENU DESCRIPTION PROGRAM MANAGER ò ACCESSORIES double click ò TERMINAL double click ò Settings click ò Communications click and select parameters see figure 7 1 1 next...

Page 31: ...ROBES M210316EN A Operating Manual 27 Figure 7 1 1 Giving the communication parameters in Windows 3 1 NOTE select the connector according to your computer Select the connector first and give then other para meters ...

Page 32: ...pe the name of the connection e g HMI41 in the appropriate field and select an icon if available click OK Connection Description type the name of the connection e g HMI41 in the appropriate field and select an icon if available click OK ò Phone Number move the cursor to the field CONNECT USING and select direct to COM x x serial port available click OK Connect to move the cursor to the field CONNE...

Page 33: ... start transferring the data from the HMI41 Note that communication parameters can be stored in the computer for future use To start transferring the data make sure that the HMI41 is connected to a serial port of your computer and that the terminal session is open Turn the HMI41 on with the ON OFF button A text similar to the following should now appear on your computer display HMI41 2 01 ...

Page 34: ... 21 15 9 21 4 12 16 21 14 9 18 5 12 09 21 12 9 27 6 12 09 21 09 9 28 If you know the starting time of the automatic data collecting you can enter it with the command and get an output showing the actual time of measurement For example play 15 05 Reading Log OK data hh mm ss RH T Td 0 15 05 00 8 52 23 69 11 70 1 15 06 00 9 58 23 66 10 26 2 15 07 00 9 60 23 50 10 35 3 15 08 00 9 61 23 30 10 48 4 15 ...

Page 35: ...CPLAY Type HELP command_name for more help To see the contents of each command type HELP command name e g PLAY and press ENTER this brings an explanation of the command and its usage on the display help play Command PLAY Purpose Send recordings from memory to serial port Usage PLAY hh mm cr hh mm rec starting time optional if command is used without parameters it uses default setting 7 3 4 Outputt...

Page 36: ...ting Manual M210316EN A 32 To exit the terminal session go to FILE menu and select EXIT Confirm that you wish to quit and then select whether you wish to store the parameters of this session for future use or not SAVE YES NO ...

Page 37: ...ault AUT PROBE and previous versions the probe type 1 If the indicator does not recognize the probe type automatically set the type manually to 2 when using the HMP46 Note also that the HMP46 probe cannot be used with the HMI41 unless the software version is 1 02 or more To check the version turn the HMI41 on with the ON OFF button The version appears on the display in a couple of seconds if it is...

Page 38: ...f the automatic power off function Table 8 2 Metric and non metric units quantity metric non metric RH RH RH T C F Td C F a g m3 gr ft3 x g kg gr lb Tw C F 8 3 Setting the automatic power off function set The number or text NO on the first line of the display indicates in minutes 1 60 the time that the HMI41 stays on before it automatically turns itself off if no buttons are pressed The number is ...

Page 39: ...r settings press ENTER the display changes to show the setting of the pressure for mixing ratio and wet bulb temperature calculations 8 5 Setting the pressure for mixing ratio and wet bulb temperature calculations set P Pa h The pressure is changed in steps of 0 25 hPa with buttons number up and number down Acknowledge the pressure setting with ENTER and a text similar to the following appears set...

Page 40: ...e HMI41 setup contains further settings start baud seri and calib that appear after probe type setting when pressing ENTER Start setting is changed only when using the HMP44 44L probes START 5 see the HM44 Operating Manual For calib see Chapter 5 Other settings are meant for the HMI41 used as a field calibrator for other Vaisala humidity transmitters It is recommended that these settings are not c...

Page 41: ...nsor and shorten its life The following table gives the recommended maximum ambient concentrations of some chemicals ppm typ Organic solvents 1000 10 000 Aggressive chemicals e g strong acids such as SO2 H2SO4 H2S HCl Cl2 etc 1 10 Weak acids 100 1000 Bases 10 000 100 000 If necessary request detailed information on allowed concentrations from Vaisala representatives 9 3 Using the HMP46 in high tem...

Page 42: ...HMP41 and HMP45 6221 Plastic grid for HMP46 6597 Membrane filter 0 2µm 10159HM Membrane filter for HMP46 HM46717 Plastic grid for HMP41 and HMP45 HM26849 Carrying case HMI41 HMP46 HMP44 L and accessories HM36736 Carrying case HMI41 HMP41 and HMP45 HM27104 Carrying case HMI41 and HMP42 HM36939 Probe holder for HMP46 used in the calibration of Vaisala s duct mounted transmitters 19446ZZ Serial inter...

Page 43: ...e Chapters 3 1 and 9 1 if the batteries are ok contact Vaisala or a Vaisala representative the display is dim during automatic data collecting the display is dim except when the readings are updated once a minute the readings seem to be wrong allow enough time for the probe to stabilize to the ambient temperature check that the probe is correctly connected to the indicator check that the grid and ...

Page 44: ... 4 8 seri E 7 1 calib def values 2 3 and 4 are for calibration cables when the calib setting is entered the value is always no factory settings for calibration correction data can be returned by selecting def If the settings are not correct change them in the setup mode select the setting with ENTER change it with buttons or and acknowledge with ENTER If the error message still appears write it do...

Page 45: ...er supply 4 batteries type AA IEC LR6 Battery operation time 72 h continuous use Operating humidity range 0 100 RH non condensing Operating temperature 20 60 C Storage temperature 40 70 C Display two line LCD Housing material ABS plastic Housing classification IP 53 with connectors blocked Connector type modular connector Weight incl batteries 300 g Dimensions with probes Ø 18 5 Ø 21 Ø 18 5 2 3 7 ...

Page 46: ...easurement range for which accuracy is specified 20 60 C Temperature sensor Pt 1000 IEC 751 1 3 Class B Accuracy C 0 4 0 3 0 2 0 1 0 0 1 0 2 0 3 0 4 20 0 20 40 60 C 10 10 30 50 11 2 3 General Typical ranges of calculated variables dewpoint temperature 40 60 C absolute humidity 0 160 g m3 wet bulb temperature 0 60 C mixing ratio 0 160 g kg d a Cable length HMP45 1500 mm extended spiral cable Connec...

Page 47: ...re dependence 40 0 40 160 80 120 2 1 0 1 2 20 20 60 100 140 180 1 5 0 5 0 5 1 5 error RH T C for temporary use only Typical long term stability better than 1 RH year Response time 90 at 20 C in still air with sintered filter 15 s Humidity sensor HUMICAP 180 11 3 2 Temperature Measurement range sensor head 40 100 C temporarily 180 C Temperature sensor Pt100 IEC 751 1 3 Class B Accuracy at 20 C 0 2 ...

Page 48: ...obe and on performing the measurement correctly In tables below the accuracies of the measured values are 2 RH and 0 2 C 11 4 1 Accuracies in metric units Accuracy of dewpoint temperature C RH 10 20 30 40 50 60 70 80 90 100 T C 40 1 82 1 00 0 74 0 61 0 53 0 48 0 44 0 42 20 2 09 1 14 0 83 0 68 0 59 0 53 0 49 0 45 0 2 51 1 37 1 00 0 81 0 70 0 63 0 57 0 53 0 50 0 48 20 2 87 1 56 1 13 0 92 0 79 0 70 0...

Page 49: ...45 0 47 0 49 0 51 0 53 0 55 40 1 08 1 13 1 18 1 24 1 29 1 34 1 39 1 44 1 49 1 54 60 2 73 2 84 2 95 3 07 3 18 3 29 3 40 3 52 3 63 3 74 80 6 08 6 30 6 51 6 73 6 95 7 17 7 39 7 61 7 83 8 05 100 12 2 12 6 13 0 13 4 13 8 14 2 14 6 15 0 15 3 15 7 120 22 6 23 3 23 9 24 6 25 2 25 8 26 5 27 1 27 8 28 4 140 39 1 40 0 41 0 42 0 43 0 44 0 45 0 45 9 46 9 47 9 160 63 5 64 9 66 4 67 8 69 2 70 7 72 1 73 5 75 0 76...

Page 50: ...018 0 019 0 020 0 021 4 0 099 0 108 0 116 0 125 0 134 0 142 0 151 0 159 32 0 57 0 61 0 65 0 69 0 73 0 77 0 81 0 85 0 89 0 93 68 2 17 2 31 2 44 2 58 2 72 2 87 3 01 3 15 3 30 3 44 104 6 85 7 31 7 77 8 25 8 74 9 25 9 77 10 3 10 9 11 4 140 18 9 20 6 22 3 24 2 26 3 28 5 30 9 33 5 36 4 39 4 176 47 5 54 6 63 0 73 1 85 2 100 118 141 170 208 212 115 151 205 289 434 709 1329 3237 248 288 530 1235 284 320 Ac...

Page 51: ... 09 1 05 1 00 0 97 0 94 140 2 62 2 16 1 86 1 64 1 49 1 37 1 28 1 20 1 14 1 09 176 4 03 2 96 2 38 2 03 1 79 1 61 1 48 1 38 1 29 1 22 212 5 52 3 68 2 84 2 36 2 05 1 83 1 66 1 54 1 44 1 36 248 6 94 4 33 3 26 2 67 2 30 2 04 1 85 1 70 1 59 1 49 284 8 23 4 92 3 65 2 97 2 54 2 25 2 03 1 87 1 74 1 63 320 9 41 5 48 4 03 3 26 2 78 2 45 2 21 2 03 1 89 1 77 11 5 Electromagnetic compatibility Complies with the...

Page 52: ...1 Manual data collecting 55 3 2 Setting the measurement duration for automatic data collecting 56 3 3 Setting the measurement interval for automatic data collecting 56 3 4 Reading the measurement results 57 3 4 1 MIN and MAX in the data collecting mode 58 4 TRANSFERRING THE MEASURED DATA TO A PC 59 4 2 Using the serial commands 61 4 2 1 PLAY Transferring the data 61 4 2 2 CPLAY Setting characters ...

Page 53: ... turned on The HMI41 software version and probe type indication If the software version does not appear it is less than 1 02 and the HMI41 can not be used with the HMP46 contact Vaisala or a Vaisala representative If the probe type indi cation 41 45 or 42 46 does not appear the indicator does not recognize the probe type automatically give the setting manually see Chapter 4 of this appendix If the...

Page 54: ...ESS MODE return to the RH T display T C Mixing ratio and temperature readings are output if mixing ratio has been selected during the setup proce dure PRESS MODE return to the RH T display HOLD freezes the display to show the current readings or outputs the minimum or maximum values measured after power up RH T C Relative humidity and temperature readings are output in the normal display mode PRES...

Page 55: ...hin 1 2 seconds press simultaneously buttons MODE and HOLD until the text SEtUP appears Wait a few seconds set C Press ENTER eight times set Press MODE twice RH set Press ENTER to activate one point humidity calibration RH set The reference humidity reading stored in the HMI41 memory is blinking Change it to the correct value see calibration table with buttons or The reading changes in steps of 0 ...

Page 56: ... Press ENTER RH Lo The indicator shows the value that the probe is currently measuring Wait at least10 minutes for the reading to stabilize and acknowledge it with ENTER Press ENTER again to conclude the lower point calibration RH set Hi The higher reference reading stored in the HMI41 memory is blinking Change it to the correct value see calibration table with buttons or Press ENTER RH Hi The ind...

Page 57: ...T Press ENTER to activate one point temperature calibration set T C The reference reading stored in the HMI41 memory is blinking Change it to the correct value with buttons or Press ENTER T C The indicator shows the value that the probe is currently measuring Wait at least 10 minutes for the reading to stabilize and acknowledge it with ENTER Press ENTER again to conclude the calibration Calibratio...

Page 58: ...r Press ENTER Lo T C The indicator shows the value that the probe is currently measuring Wait at least 10 minutes for the reading to stabilize and acknowledge it with ENTER Press ENTER again to conclude the lower point calibration set Hi T C The higher reference reading stored in the HMI41 memory is blinking Change it to the correct value with buttons or Press ENTER Hi T C The indicator shows the ...

Page 59: ...cting Press ENTER to start the measurements RH set T C The probe is now taking measurements You can store the readings at appropriate intervals by pressing the button HOLD This brings the sequence number of the reading in the indicator s memory on the display for a couple of seconds The indicator returns automatically to the previous display The readings can be read in the REC READ mode see chapte...

Page 60: ...n be set from 15 minutes to 7 days Text BAT on the display indicates that the battery charge is not sufficient for the duration time selected select a shorter duration time Turn the indicator off or press ENTER for setting the measurement interval 3 3 Setting the measurement interval for automatic data collecting min Previously set measurement interval appears If the previously set interval is too...

Page 61: ...the second line indicate the sequence number of the stored reading in the indicator memory Numbers on the right of the second line indicate the temperature measured simultaneously with the first line reading The decimals of the T reading can be seen by pressing the button ENTER RH T C The display returns to the previous display after a couple of seconds T Td C C You can change the quantity on the ...

Page 62: ...e the maximum value of the first line reading is being observed MAX maximum HI the first line reading press ENTER to see the T reading with decimals RH min Lo T C In this example the minimum value of the second line reading is being observed MIN minimum LO the 2nd line reading press ENTER to see the T reading with decimals RH max Lo T C In this example the maximum value of the second line reading ...

Page 63: ...3 1 MENU DESCRIPTION PROGRAM MANAGER ò ACCESSORIES double click ò TERMINAL double click ò Settings click ò Communications click and select parameters see list below click OK ò move the cursor to File click ò Save as click and save settings type the name of the file e g HMI41 and click OK Turn the HMI41 on and follow the instructions in Ch 4 2 The communication parameters are connector according to...

Page 64: ...pe the name of the connection e g HMI41 in the appropriate field and select an icon if available click OK Connection Description type the name of the connection e g HMI41 in the appropriate field and select an icon if available click OK ò Phone Number move the cursor to the field CONNECT USING and select direct to COM x x serial port available click OK Connect to move the cursor to the field CONNE...

Page 65: ... play Reading Log OK data RH T Td 1 12 10 21 23 9 16 2 12 18 21 18 9 12 3 12 12 21 15 9 21 4 12 16 21 14 9 18 5 12 09 21 12 9 27 6 12 09 21 09 9 28 If you know the starting time of the automatic data collecting type it with the command for example play 15 05 Reading Log OK data hh mm ss RH T Td 0 15 05 00 8 52 23 69 11 70 1 15 06 00 9 58 23 66 10 26 2 15 07 00 9 60 23 50 10 35 3 15 08 00 9 61 23 3...

Page 66: ...nts of each command type HELP command name e g PLAY and press ENTER help play Command PLAY Purpose Send recordings from memory to serial port Usage PLAY hh mm cr hh mm rec starting time optional if command is used without parameters it uses default setting 4 3 4 Outputting the HMI41 settings Type and press ENTER HMI41 2 01 Serial number A0000000 Output units metric Baud P D S 4800 E 7 1 FDX Pressu...

Page 67: ...ns until the text SEtUP appears on the display DISPLAY WHAT TO DO PRESS Wait for a few seconds set C Select the display units 0 metric units 1 non metric units number up or number down ENTER to scroll the menu or ON OFF to exit the setup mode set Set the time for the automatic power off in minutes NO 1 60 if NO is chosen the power off function is not activated up or down ENTER to scroll the menu o...

Page 68: ... after probe type setting when pressing ENTER Start setting is changed only when using the HMP44 L probes START 5 see the HM44 Operating Manual For calib see the operating manual Other settings are meant for the HMI41 used as a field calibrator for Vaisala humidity transmitters Do not change them Press ON OFF after probe type setting ...

Page 69: ...er 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 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 maint...

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