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MDM25 User’s Manual

10

 

 

 

97234 Issue 4, January 2018

OPERATION

3.2.2 Device 

Settings

DEVICE

AUTO OFF

To save battery life the 

Auto Off automatically 

switches off the device if 

it is not in use.

By pressing the Up and 

Down Keys the period of 

inactive time before 

power-off can be set to 

between 1 and 20 

minutes or disabled 

entirely.

Steps of 1 min up to 10

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 Keys the 

3rd value option can 

be set to read: 

Dew point

Abs Hum

Wet Bulb or 

None

Press 

Press 

Press 

Press 

To store these settings in the memory, press the Menu 

button to return to the Main page.  When the hand meter 

is turned on again this setting is saved.

To store the settings for ONLY the current session, press 

the Left Key

Figure 7 

Device Settings Menu

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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