Vaisala HMI41 Operating Manual
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Vaisala HMI41 Operating Manual

Indicator and probe
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OPERATING MANUAL

HMI41 Indicator
and HMP42 Probe
M210317EN-A

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Summary of Contents for Vaisala HMI41

  • Page 1: Operating Manual

    OPERATING MANUAL HMI41 Indicator and HMP42 Probe M210317EN-A...
  • Page 2 © Vaisala Oy 2004 No part of this document 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 a prior written notice of the copyright holder.

  • Page 3: Table Of Contents

    HMI41 AND HMP42 M210317EN-A Operating Manual Contents THE HMI41 INDICATOR AND PROBES................1 TO BE NOTED IN THE MEASUREMENT OF HUMIDITY ............. 3 GETTING STARTED ......................4 Inserting the batteries..................... 4 Connecting the HMP42 probe................. 4 Starting the measurements ..................4 Using the HMP42 for measuring equilibrium humidity in structures ....
  • Page 4 HMI41 AND HMP42 Operating Manual M210317EN-A Selecting the display quantities ................39 Setting the pressure for mixing ratio and wet bulb temperature calculations .. 40 Selecting the probe type ..................40 MAINTENANCE........................41 Changing the filter and the sensor head set ............41 ...

  • Page 5: The Hmi41 Indicator And Probes

    When equipped with optional calibration cables, the HMI41 can also be used as a field calibrator for most Vaisala transmitters. The HMI41 has as many as six different probe types to choose from. The indicator recognizes the probe type automatically, so there is no need to change settings each time the probe is changed.
  • Page 6 HMI41 AND HMP42 Operating Manual M210317EN-A The HMI41 indicator displays relative humidity, temperature and dewpoint temperature readings. In addition to these, one of the following quantities can also be chosen: absolute humidity, wet bulb temperature or mixing ratio. The indicator also features an automatic power-off function which can be disabled, and a continuously updated display.

  • Page 7: To Be Noted In The Measurement Of Humidity

    HMI41 AND HMP42 M210317EN-A Operating Manual TO BE NOTED IN THE MEASUREMENT OF HUMIDITY In the measurement of humidity and especially in calibration it is essential that temperature equilibrium is reached. Even a small difference in temperature between the measured object and the sensor causes an error. If the temperature is +20 °C (+68 °F) and the relative humidity is 50 %RH, a difference of +1 °C between the measured object and the sensor causes an error of +3 %RH.

  • Page 8: Getting Started

    HMI41 AND HMP42 Operating Manual M210317EN-A GETTING STARTED Inserting the batteries When taking the HMI41 indicator into use, first insert the batteries (4 pcs of size AA [LR6] batteries). Open the lid on back of the device and insert the batteries as indicated in the housing.

  • Page 9: Using The Hmp42 For Measuring Equilibrium Humidity In Structures

    HMI41 AND HMP42 M210317EN-A Operating Manual NOTE: if the following appears, check that the probe is correctly connected: If the software version does not appear, it is smaller than 1.02 and the indicator cannot be used with the HMP42 probe. If the probe type does not appear, the indicator is of a previous version and does not recognize the probe type automatically;...

  • Page 10: Example 2: Measuring Humidity In A Concrete Floor

    HMI41 AND HMP42 Operating Manual M210317EN-A 3.4.2 Example 2: measuring humidity in a concrete floor Bore a hole and clean it thoroughly so that all drilling dust comes out; blowing air is a good method for cleaning. However, please, note that if you clean several holes, you should use a mask to protect yourself against dust.

  • Page 11: Erroneous Installations

    HMI41 AND HMP42 M210317EN-A Operating Manual 3.4.3 Erroneous installations Please, note that although with a metal probe head, the HMP42 is a delicate instrument and requires careful handling. The probe must never be strongly bent or forced through anything; if necessary, use e.g. a sharp edged pin with a diameter of 5 mm.

  • Page 12: How To Use The Hmi41 Indicator And Hmp42 Probe

    After a few seconds, the software version and probe type indication appear: If the software version does not appear, it is smaller than 1.02 and the HMI41 cannot be used with the HMP42. Contact Vaisala or a Vaisala representative for further information.

  • Page 13: Measurement Readings On Display

    HMI41 AND HMP42 M210317EN-A Operating Manual Measurement readings on display Relative humidity and temperature readings appear automatically after the battery charge indication: °C If MODE button is pressed, dewpoint temperature (Td) reading is displayed: °C °C When the MODE button 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 4.4): °C...

  • Page 14: Hold-Mode

    HMI41 AND HMP42 Operating Manual M210317EN-A HOLD-mode In any of the previously mentioned measurement reading displays, the HOLD button freezes the display to show the current readings, e.g. RH & T readings: °C hold With MODE or ENTER, the display returns to the normal display mode. If the indicator turns itself off with the automatic power-off function during the HOLD-mode, it wakes up in the same mode when turned on again.

  • Page 15: Calibration

    HMI41 AND HMP42 M210317EN-A Operating Manual CALIBRATION How to use the HMP42 calibration adapter As the HMP42 probe diameter is extremely small, the probe has a special calibration adapter for inserting the probe into a salt chamber (e.g. in the HMK15 calibrator).

  • Page 16: Calibration With Trimmer Potentiometers

    1.5 mm slot screwdriver. Figure 5.2.1 Adjusting the trimmer potentiometers A two point calibration is performed with the HMK15. Calibrator or the probe can be sent to Vaisala. The probes must always be re-calibrated if the sensor head set is changed.
  • Page 17 HMI41 AND HMP42 M210317EN-A Operating Manual The calibration procedure is as follows (see also the calibrator manual): • Leave the calibrator and the probe at the calibration site for at least 30 minutes before starting the calibration in order to let the probe temperature stabilize to the room temperature.

  • Page 18: Calibration With Hmi41 Software Commands

    HMI41 AND HMP42 Operating Manual M210317EN-A Table 5.2 Greenspan’s calibration table °C LiCl NaCl K 2 SO 4 75.5 98.8 75.7 98.5 75.7 98.2 75.6 97.9 11.3 75.5 97.6 11.3 75.3 97.3 11.3 75.1 97.0 11.3 74.9 96.7 11.2 74.7 96.4 11.2 74.5...
  • Page 19 HMI41 AND HMP42 M210317EN-A Operating Manual The calibration procedure is included in the HMI41 setup mode. For entering the setup mode, first press the ON/OFF button and the following appears: °C °F °C °F set min max hyst hold Lo bat Hi Then release the ON/OFF button and press within 1...2 seconds both ENTER and MODE buttons until the following text appears on the display: After a few seconds, the text changes automatically to show the following:...

  • Page 20: One Point Humidity Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A All selections are acknowledged with ENTER. In the following, you will find a list of these calibration options. Default calibration restores the factory settings of the humidity and temperature calibrations. One point humidity calibration; select this for performing humidity calibration at one point.
  • Page 21 HMI41 AND HMP42 M210317EN-A Operating Manual Then press MODE twice, and the following appears: Press ENTER to activate the one point calibration mode. A message similar to the following appears with the first line blinking: The blinking number indicates the humidity reference value in the HMI41 memory.

  • Page 22: Two Point Humidity Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A The correction data has now been calculated and stored in the HMI41 memory. The HMI41 returns automatically to the selection of 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: °C...
  • Page 23 HMI41 AND HMP42 M210317EN-A Operating Manual The blinking number indicates the value of the lower humidity reference stored in the HMI41 memory. Check the salt chamber temperature, read the closest humidity value in the calibration table and adjust the display with buttons to correspond to the value given in the table.

  • Page 24: One Point Temperature Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A Wait at least ten minutes for the reading to stabilize and press ENTER to acknowledge the value. Press ENTER again to conclude the calibration. If the calibration has been successful, the following message appears: The correction data has now been calculated and stored in the HMI41 memory.
  • Page 25 HMI41 AND HMP42 M210317EN-A Operating Manual Press ENTER to activate the one point temperature calibration mode. A message similar to the following appears with the first line blinking: °C The blinking number indicates the temperature reference value stored in the HMI41 memory.

  • Page 26: Two Point Temperature Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A °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 incorrect reference value or to measured values that are out of the range.
  • Page 27 HMI41 AND HMP42 M210317EN-A Operating Manual °C Press ENTER and the HMI41 shows the value that the probe is currently measuring, displaying a message similar to the following: °C Wait at least ten minutes for the reading to stabilize and press ENTER to acknowledge the value.
  • Page 28 HMI41 AND HMP42 Operating Manual M210317EN-A The correction data has now been calculated and stored in the HMI41 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: °C...

  • Page 29: Hmi41 And Data Collecting

    HMI41 AND HMP42 M210317EN-A Operating Manual HMI41 AND DATA COLLECTING The HMI41 indicator can also be used for collecting the measurement data. The data is stored in the indicator's non-volatile memory which means that it is not lost when the indicator is turned off. Please, note also that the automatic power-off function is not active during data collecting even if previously selected (see Chapter 8.3).

  • Page 30: Manual Data Collecting

    HMI41 AND HMP42 Operating Manual M210317EN-A Manual data collecting For manual data collecting, press the button MODE and the following appears: Press ENTER and a text similar to the following appears: °C The probe is now taking measurements and you can store the readings at appropriate intervals by pressing the button HOLD.

  • Page 31: Setting The Measurement Duration

    HMI41 AND HMP42 M210317EN-A Operating Manual Setting the measurement duration Turn the indicator on with the ON/OFF button, press immediately the button HOLD and keep it pressed until the text appears on the display. REC AUTO Press ENTER and a text similar to the following on the display: (previously set duration) In this mode, you can set the time between the first and the last measurement stored, e.g.

  • Page 32: Reading The Measurement Results

    HMI41 AND HMP42 Operating Manual M210317EN-A Select the interval with buttons . The measurement interval can be selected in steps according to the following: • 1 - 5 min: each pressing = 1 minute • 10 min; 15 min; 30 min •...
  • Page 33 HMI41 AND HMP42 M210317EN-A Operating Manual number 0.) is the sequence number of the measurement. This number helps to estimate the time of the measurement during automatic data collecting provided that the starting time and the measurement interval are known. Numbers located on the right on the second line indicate the temperature reading measured simultaneously with the reading on the first line;...

  • Page 34: Min And Max In Data Collecting Rec Read Mode

    HMI41 AND HMP42 Operating Manual M210317EN-A 6.5.1 MIN and MAX in data collecting mode REC READ When the data collecting mode has been activated, the HOLD REC READ button brings four different modes on the display: MIN HI MAX HI MIN LO .

  • Page 35: Transferring The Stored Readings To A Pc

    HMI41 AND HMP42 M210317EN-A Operating Manual TRANSFERRING THE STORED READINGS TO A PC The readings that have been stored in the HMI41 memory manually or automatically in the data collecting mode, can be transferred to a computer and then printed if desired. In order to do this, connect a serial connection cable (order code 19446ZZ) to the appropriate connectors: connect the serial cable...
  • Page 36 HMI41 AND HMP42 Operating Manual M210317EN-A NOTE: select the connector according to your computer. Select the connector first and then other Figure 7.1.1 Giving the communication parameters in Windows 3.1...
  • Page 37 HMI41 AND HMP42 M210317EN-A Operating Manual Table 7.1.2 Giving parameters in Windows 95 and Windows NT WINDOWS 95 WINDOWS NT MENU WHAT TO DO MENU WHAT TO DO Start Start ò ò move the cursor to: move the cursor to: Programs Programs ò...

  • Page 38: Transferring The Data

    HMI41 AND HMP42 Operating Manual M210317EN-A Figure 7.1.2 Selecting the parameters in Windows 95 and NT Transferring the data When you have given the communication parameters, you can start transferring the data from the HMI41. Store the parameters 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.
  • Page 39 HMI41 AND HMP42 M210317EN-A Operating Manual An example of outputting manually collected data: >play Reading Log... OK data 12.54 21.53 -8.48 12.10 21.23 -9.16 12.18 21.18 -9.12 12.12 21.15 -9.21 12.16 21.14 -9.18 12.09 21.12 -9.27 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.
  • Page 40 HMI41 AND HMP42 Operating Manual M210317EN-A 7.2.3 HELP Outputting all available commands and their contents If you wish to see which commands are available, type HELP and press ENTER. The following list appears: >help Available commands : HELP PLAY CPLAY Type HELP <command_name>...

  • Page 41: Setup Procedure

    HMI41 on with the ON/OFF button. The version appears on the display in a couple of seconds if it is 1.02 or greater. If it does not appear, contact Vaisala or a Vaisala representative for further information. Entering the setup mode...

  • Page 42: Selecting The Display Units

    HMI41 AND HMP42 Operating Manual M210317EN-A After a few seconds, the text changes automatically to show the following: °C You can scroll the setup menu by pressing ENTER. Selecting the display units °C You can now select the display units with buttons (number up) or (number down).

  • Page 43: Setting The Automatic Power-Off Function

    HMI41 AND HMP42 M210317EN-A Operating Manual Setting the automatic power-off function 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 changed with buttons (number up) and (number down).

  • Page 44: Setting The Pressure For Mixing Ratio And Wet Bulb Temperature Calculations

    HMP44/44L probes ( 5, see the HM44 START 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 changed.

  • Page 45: Maintenance

    If the steel grid looks dirty, remove it and clean the holes e.g. with a needle. It is recommended that the sensor head set is changed by Vaisala authorized maintenance personnel only. However, if for some reason it is necessary to do this yourself, be careful not to break the sensor.

  • Page 46: Spare Parts And Accessories

    HMI41 AND HMP42 Operating Manual M210317EN-A Spare parts and accessories Order code Description 19809HM Rubber sleeve set (10 pcs) HM37067 Calibration adapter 19858HM Membrane filter set, 5 pcs (AISI 316/PTFE) 19867HM Steel grid HM27104 Carrying bag for HMI41 and HMP42 HM36959 Trimming screw wrench set 1.5 mm / 2.5 mm HMP42P235SP...

  • Page 47: In Case Of Error

    WHAT TO DO: - check the batteries (see Chapters 3.1 and 9.1) the display is blank - if the batteries are ok, contact Vaisala or a Vaisala representative the display is dim - during automatic data collecting, the display is dim...

  • Page 48: Checking The Settings

    If the settings are not correct, change them: in the setup mode, select the setting with ENTER, change it with buttons and acknowledge with ENTER. If the error message still appears, write it down and contact Vaisala or a Vaisala representative for further instructions.

  • Page 49: Technical Data

    HMI41 AND HMP42 M210317EN-A Operating Manual TECHNICAL DATA 11.1 HMI41 indicator Maximum measurement error caused by the indicator at 20 °C (for system accuracy, see probes’ technical specifications) humidity +0.1 %RH +0.1 °C temperature Calculated variables dewpoint temperature, absolute humidity, wet bulb temperature, mixing ratio 0.1 %RH;...

  • Page 50: Hmp42 Probe

    HMI41 AND HMP42 Operating Manual M210317EN-A 11.2 HMP42 probe 11.2.1 Relative humidity Measurement range 0...100 %RH non-condensing Accuracy (at +20 °C) when calibrated against salt solutions (ASTM E104-85): ±2 %RH (0...90 %RH) ±3 %RH (90...100 %RH) Temperature dependence ±0.05 %RH/ °C of electronics Typical long-term stability better than 1 %RH per year...
  • Page 51 HMI41 AND HMP42 M210317EN-A Operating Manual 11.2.3 General Cable length 1500 mm; extended spiral cable Connector type modular connector Operating temperature range -20...+60 °C for electronics -40...+100 °C Storage temperature range Housing material ABS plastic Housing classification (electronics) IP65 (NEMA 4) Sensor protection steel grid with membrane filter Weight...

  • Page 52: Accuracy Of The Calculated Quantities

    HMI41 AND HMP42 Operating Manual M210317EN-A 11.4 Accuracy of the calculated quantities Dewpoint temperature, mixing ratio, absolute humidity and wet bulb tempera- ture are calculated from the measured relative humidity and temperature values. The accuracy of the calculated quantities depends on the calibration of the probe and on performing the measurement correctly.
  • Page 53 HMI41 AND HMP42 M210317EN-A Operating Manual Accuracy of absolute humidity (g/m RH/% 0.003 0.003 0.003 0.003 0.004 0.004 0.004 0.005 T/°C 0.020 0.021 0.023 0.025 0.026 0.028 0.029 0.031 0.10 0.11 0.12 0.13 0.13 0.14 0.15 0.15 0.16 0.17 0.37 0.39 0.41 0.43...
  • Page 54 HMI41 AND HMP42 Operating Manual M210317EN-A Accuracy of mixing ratio (gr/lb) with ambient pressure of 1013.25 mbar RH/% 0.013 0.014 0.015 0.016 0.018 0.019 0.020 0.021 T/°F 0.099 0.108 0.116 0.125 0.134 0.142 0.151 0.159 0.57 0.61 0.65 0.69 0.73 0.77 0.81 0.85...

  • Page 55: Electromagnetic Compatibility

    HMI41 AND HMP42 M210317EN-A Operating Manual 11.5 Electromagnetic compatibility Complies with the following standard: EN 61326-1:1997 +Am 1:1998, Electrical equipment for measurement, control and laboratory use - EMC requirements: Light environment.
  • Page 56 HMI41 AND HMP42 Operating Manual M210317EN-A APPENDIX 1: QUICK REFERENCE TO COMMANDS 1. DISPLAY TEXTS AND OPERATING COMMANDS ..............53 2. CALIBRATION WITH THE HMI41 SOFTWARE ..............55 2.1 One-point humidity calibration................55 2.2 Two-point humidity calibration................56 2.3 One-point temperature calibration..............57 2.4 Two-point temperature calibration..............

  • Page 57: Display Texts And Operating Commands

    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 (42.46) does not appear, the indicator does not recognize the probe type automatically;...
  • Page 58 HMI41 AND HMP42 Operating Manual M210317EN-A MODE: outputting of the selected quantities Relative humidity and temperature readings are output (automatically after power-up). °C PRESS MODE (the following appears): Dewpoint temperature and temperature readings are output. PRESS MODE (return to the normal RH&T °C display or one of the following appears): °C...

  • Page 59: Calibration With The Hmi41 Software

    HMI41 AND HMP42 M210317EN-A Operating Manual CALIBRATION WITH THE HMI41 SOFTWARE This quick reference is meant for those users who already know how to use the HMI41 indicator. The operating manual gives more detailed instructions. NOTE: it is recommended that the calibration is done with trimmer potentiometers of the probe.

  • Page 60: 2.2 Two-Point Humidity Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A 2.2 Two-point humidity calibration Turn the HMI41 indicator on. Within 1-2 seconds °C °F press simultaneously buttons MODE and HOLD °C °F until the text SEtUP appears. set min max hyst hold Lo bat Hi Wait a few seconds.

  • Page 61: 2.3 One-Point Temperature Calibration

    HMI41 AND HMP42 M210317EN-A Operating Manual 2.3 One-point temperature calibration Turn the HMI41 indicator on. Within 1-2 seconds °C °F press simultaneously buttons MODE and HOLD °C °F until the text SEtUP appears. set min max hyst hold Lo bat Hi Wait a few seconds.

  • Page 62: 2.4 Two-Point Temperature Calibration

    HMI41 AND HMP42 Operating Manual M210317EN-A 2.4 Two-point temperature calibration Turn the HMI41 indicator on. Within 1-2 seconds °C °F press simultaneously buttons MODE and HOLD °C °F until the text SEtUP appears. set min max hyst hold Lo bat Hi Wait a few seconds.

  • Page 63: Data Collecting Mode

    HMI41 AND HMP42 M210317EN-A Operating Manual DATA COLLECTING MODE Manual data collecting Turn the indicator on. Within 1 - 2 seconds press °C°F the button HOLD until the text appears, REC AUTO °C°F Pabs then release the button. set min max hyst hold Lo bat Hi Press the button MODE to enter the manual data collecting.

  • Page 64: Setting The Measurement Duration For Automatic Data Collecting

    HMI41 AND HMP42 Operating Manual M210317EN-A Setting the measurement duration for automatic data collecting Turn the indicator on. Within 1 - 2 seconds press °C°F the button HOLD until the text appears, REC AUTO °C°F Pabs then release the button. set min max hyst hold Lo bat Hi Press ENTER when the text...

  • Page 65: Reading The Measurement Results

    HMI41 AND HMP42 M210317EN-A Operating Manual Reading the measurement results Turn the indicator on. Within 1 - 2 seconds press °C°F the button HOLD until the text appears, REC AUTO °C°F Pabs then release the button. set min max hyst hold Lo bat Hi Press twice the button MODE.

  • Page 66: Min And Max In The Data Collecting Mode

    HMI41 AND HMP42 Operating Manual M210317EN-A 3.4.1 MIN and MAX in the data collecting mode In this example, the minimum value of the first line reading is being observed ( = minimum, = the °C first line reading); press ENTER to see the T reading with decimals.

  • Page 67: Transferring The Measured Data To A Pc

    HMI41 AND HMP42 M210317EN-A Operating Manual TRANSFERRING THE MEASURED DATA TO A PC 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 4.1 Giving parameters in Windows 3.1 MENU DESCRIPTION ROGRAM...
  • Page 68 HMI41 AND HMP42 Operating Manual M210317EN-A Table 4.2 Giving parameters in Windows 95 and Windows NT WINDOWS 95 WINDOWS NT MENU WHAT TO DO MENU WHAT TO DO Start Start ò ò move the cursor to: move the cursor to: Programs Programs ò...

  • Page 69: Using The Serial Commands

    HMI41 AND HMP42 M210317EN-A Operating Manual Using the serial commands 4.2.1 PLAY Transferring the data To output the stored readings on your computer, turn the HMI41 on, type PLAY and press ENTER. An example of outputting automatically stored readings: >play Reading Log...

  • Page 70: Help Outputting Available Commands And Their Contents

    HMI41 AND HMP42 Operating Manual M210317EN-A To change the output, type , the character you wish to appear between CPLAY decimals, the character you wish to use between fields and then <cr>. An example: >cplay , <cr> Desimal separator : , Field separator : TAB example:...

  • Page 71: Setup

    HMI41 AND HMP42 M210317EN-A Operating Manual SETUP The HMI41 factory settings are the following: - display units: (metric) - automatic power-off: (minutes) - display quantities: (RH, T and Td) - pressure: 1013.25 hPa (1 hPa = 1 mbar) - probe type: (or 1, see below) - start: Indicators marked with letters ID have the automatic probe recognition (...
  • Page 72 HMP44/L probes ( 5, see the HM44 START 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 73 Defective parts replaced in accordance with this clause shall be placed at the disposal of Vaisala. Vaisala also warrants the quality of all repair and service works performed by its employees to products sold by it. In case the...
  • Page 74 *M210317EN*...

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