Michell Instruments MDM25 User Manual
MDM25
Hygrometer
User’s Manual
RH
53.1%
Ta
21.0°C
3
Abs H
9.7
g:M
MDM25
Hygrometer
97234 Issue 4
January 2018
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Use this information when contacting Michell Instruments for service purposes.
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MDM25
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www.michell.com
© 2018 Michell Instruments
This document is the property of Michell Instruments 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.
MDM25 User’s Manual
Contents
Safety ................................................................................................................................vi
Electrical Safety ...........................................................................................................vi
Pressure Safety ............................................................................................................vi
Toxic Materials .............................................................................................................vi
Repair and Maintenance ...............................................................................................vi
Calibration ...................................................................................................................vi
Safety Conformity ........................................................................................................vi
Abbreviations .....................................................................................................................vii
Warnings ...........................................................................................................................vii
1 INTRODUCTION ................................................................................................1
1.1 Description ........................................................................................................ 2
1.1.1 Controls and Indicators ................................................................................. 2
1.1.2 Instrument 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 Fitting the Batteries ....................................................................................... 6
2.4 Mounting and Connecting the Probe .................................................................... 7
3 OPERATION ......................................................................................................8
3.1 Preparation for Operation .................................................................................... 8
3.2 Overall Menu Structure ....................................................................................... 8
3.2.1 Display Settings ............................................................................................ 9
3.2.2 Device Settings ........................................................................................... 10
3.2.3 About ......................................................................................................... 11
4 MAINTENANCE ...............................................................................................12
4.1 Probe Calibration .............................................................................................. 12
4.2 Cleaning .......................................................................................................... 12
4.3 Probe Replacement ........................................................................................... 12
4.4 Batteries .......................................................................................................... 12
iv 97234 Issue 4, January 2018
MDM25 User’s Manual
Figures
Figure 1 Controls and Indicators ...............................................................................2
Figure 2 Display ......................................................................................................3
Figure 3 Battery Compartment Location ....................................................................6
Figure 4 Probe Connections ......................................................................................7
Figure 5 Main Menu Structure ..................................................................................8
Figure 6 Display Settings Menu .................................................................................9
Figure 7 Device Settings Menu ...............................................................................10
Figure 8 About Menu .............................................................................................11
Tables
Table 1 Unit Descriptions .........................................................................................4
Appendices
Appendix A Technical Specifi cations .............................................................................. 14
Appendix B Quality, Recycling & Warranty Information ...................................................16
Appendix C Analyzer Return Document & Decontamination Declaration .......................... 18
Michell Instruments v
MDM25 User’s Manual
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
competent personnel using good engineering practice for all procedures in this manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied
by the manufacturer 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 this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. Refer
to www.michell.com for details of Michell Instruments’ worldwide offi ces contact information.
Calibration
An annual calibration is recommended for the RH probe. This should be returned to the manufacturer,
Michell Instruments, or one of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives.
vi 97234 Issue 4, January 2018
MDM25 User’s Manual
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
3
grams per cubic meter
g/m
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.
Michell Instruments vii
MDM25 User’s Manual
1 INTRODUCTION
The MDM25 is a battery operated handmeter.
INTRODUCTION
Available with a number of different probe confi gurations and the ability to display
relative humidity, temperature, absolute humidity (g/m
temperature, the MDM25 is suitable for spot-checking humidity in a wide variety of
applications.
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 transportation of the unit.
It is powered by 3 alkaline ‘AA’ size cells, which are designed to last a minimum of 150
continuous hours between replacement. Continuous battery charge status indication is
provided by a battery indicator icon.
A graphical display presents the RH and temperature readings, in addition to a selectable
third value, in large format characters.
3
), dew point and wet bulb
Michell Instruments 1
INTRODUCTION
1.1 Description
1.1.1 Controls and Indicators
The controls and indicators associated with the MDM25 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.
MDM25 User’s Manual
Figure 1
shows the layout of the controls.
1
2
3
4
h
h
h
h
h
h
5
6
1 Display
2 Left and Exit Key
3 Enter Key
4 Down Key
5 Up Key
6 Power Key
Figure 1
Controls and Indicators
2 97234 Issue 4, January 2018
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