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MDM25 User’s Manual

Michell Instruments

 

 

vii

Abbreviations

The following abbreviations are used in this manual:

Abs H  

absolute humidity

ºC  

degrees 

Celsius

ºF   degrees 

Fahrenheit

LCD   

liquid crystal display

g   grams
g/m

3

   

grams per cubic meter

lb   pound
mm  

millimeters

oz   ounce
RH  

relative 

humidity

sec  

second(s)

T   temperature
Ta   ambient 

temperature

Td  

dew 

point

Tw 

 

wet bulb temperature

V   Volts
%   percentage 

 

Warnings

The following general warnings listed below are applicable to this instrument. They are 

repeated in the text in the appropriate locations.

Where this hazard warning symbol appears in the following 

sections it is used to indicate areas where potentially 

hazardous operations need to be carried out.

 

Summary of Contents for MDM25

Page 1: ...MDM25 Hygrometer User s Manual RH Ta Abs H 53 1 21 0 C 9 7g M 3 MDM25 Hygrometer 97234 Issue 4 January 2018...

Page 2: ...nformation when contacting Michell Instruments for service purposes Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date Location of Inst...

Page 3: ...Ltd and may not be copied or otherwise reproduced communicated in any way to third parties nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd...

Page 4: ...ment Display 3 1 2 Display Units 4 1 3 Display Settings 4 1 4 Device Settings 4 1 5 About 4 2 INSTALLATION 5 2 1 Unpacking the Instrument 5 2 2 MDM25 Accessories 5 2 3 Battery Requirements 6 2 3 1 Fit...

Page 5: ...ndix C Analyzer Return Document Decontamination Declaration 18 Figures Figure 1 Controls and Indicators 2 Figure 2 Display 3 Figure 3 Battery Compartment Location 6 Figure 4 Probe Connections 7 Figure...

Page 6: ...anufacturer for use with the instrument Pressure Safety This product is not suitable for use at pressures greater than atmospheric Toxic Materials The use of hazardous materials in the construction of...

Page 7: ...llimeters oz ounce RH relative humidity sec second s T temperature Ta ambient temperature Td dew point Tw wet bulb temperature V Volts percentage Warnings The following general warnings listed below a...

Page 8: ...ions The hygrometer is contained within a molded ABS housing with a rubber surround for drop protection sealed to IP54 standards The rubber surround allows for comfortable hand held operation and safe...

Page 9: ...25 hygrometer are located on the front panel The probe connection to the MDM25 hygrometer is made to the top panel and the battery charger cover is located on the rear of the instrument Figure 1 shows...

Page 10: ...attery Charge Indicator Icon displays 3 dots when full When battery icon is empty replace the batteries 2 RH Display 3 Temperature Display 4 3rd Output Display presents the selected 3rd output either...

Page 11: ...w or condensation forms on cooling a gas This is therefore the temperature at which air becomes saturated in equilibrium with water Absolute Humidity Abs H g m3 The mass of water vapor present in unit...

Page 12: ...al 2 2 MDM25 Accessories Filters and Protection Caps For 12mm probe For 19mm probe Slotted protection cap black Slotted protection cap black Mesh filter Mesh filter Flat SS sintered dust filter Flat S...

Page 13: ...high energy density and long shelf life Do not mix different type of batteries All three batteries must be of the same type 2 3 1 Fitting the Batteries Unscrew the battery compartment and insert the...

Page 14: ...directly into the connector on the top of the MDM25 Align the locating peg with the locating notch and then rotate the knurled thumb wheel until the probe is securely held in place Locating Peg Locat...

Page 15: ...temperature Ta If using the MDM25 alongside the S503 RH calibrator adjust the display orientation to allow for the product to be read correctly when upside down If there is there is no reading on the...

Page 16: ...5 bright DISPLAY ORIENTATION Press Press Press Press Special feature The display turns automatically when hand meter is positioned upside down To store these settings in the memory press the Menu but...

Page 17: ...0 Steps of 5 mins from 10 to 20 AUTO OFF disabled TEMP UNITS By pressing the Up and Down Keys temperature units can be selected as either Celcius or Fahrenheit 3RD VALUE By pressing the Up and Down Ke...

Page 18: ...ON 3 2 3 About ABOUT FIRMWARE VERSION View the firmware version and serial number of the hand meter This number relates to the hand held unit ONLY not the attached probe Press Press Press the Menu but...

Page 19: ...mage Care should be taken to avoid mechanical shock impact or thermal shock sudden temperature changes 4 1 Probe Calibration Salt solutions are commonly used for the calibration of RH sensors Michell...

Page 20: ...MDM25 User s Manual Michell Instruments 13 APPENDIX A Appendix A Technical Specifications...

Page 21: ...al Connections M9 5 way binder connector PROBES Performance Measurement Range RH 0 100 RH Accuracy at 25 C 77 F Temperature 0 2 C 0 36 F Stability RH Sensor 1 RH year Response time RH Sensor 10 sec ty...

Page 22: ...MDM25 User s Manual Michell Instruments 15 APPENDIX B Appendix B Quality Recycling Warranty Information...

Page 23: ...ectives Full information can be found on our website at www michell com compliance This page contains information on the following directives ATEX Directive Calibration Facilities Conflict Minerals FC...

Page 24: ...MDM25 User s Manual Michell Instruments 17 APPENDIX C Appendix C Analyzer Return Document Decontamination Declaration...

Page 25: ...s chemicals YES NO Radioactive substances YES NO Other hazards YES NO Please provide details of any hazardous materials used with this equipment as indicated above use continuation sheet if necessary...

Page 26: ......

Page 27: ...use EMC requirements Group 1 Class B equipment emissions and Portable Equipment immunity and has been designed to be in conformance with the relevant sections of the following standards or other norma...

Page 28: ...http www michell com...

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