Michell Instruments MDM300 I.S. User manual

MDM300
Advanced Dew-Point Hygrometer
User Manual
97122 Issue 16.2
June 2022
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© 2022 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.
MDM300
Advanced Dew-Point Hygrometer
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MDM300 User Manual
Contents
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MDM300 User Manual
31
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39
Tables
12
23
25
27
28
29
33
55
Appendices
51
52
57
59
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MDM300 User Manual
Figures
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MDM300 User Manual
Safety
!
Electrical Safety
NOTE: No other battery charger unit, other than that supplied with the instrument
should be used.
NOTE: Do not allow the battery to fully discharge.
!
Pressure Safety
!
Toxic Materials
Repair and Maintenance
Calibration
Safety Conformity
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MDM300 User Manual
Abbreviations
W
Warnings
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.
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MDM300 User Manual
1
INTRODUCTION
1 INTRODUCTION
° °
•
•
•
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MDM300 User Manual
2
INTRODUCTION
Figure 1
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MDM300 User Manual
3
INTRODUCTION
1.1 Controls and Indicators
Figure 2
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MDM300 User ManualINTRODUCTION
Item Panel Description
1
2
3NOTE: The instrument does not need be switched ON
in order to charge the internal NiMH battery.
5
7
!ONLY USE THE CHARGER PROVIDED
!Never allow the battery to fully discharge
Table 1
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MDM300 User ManualINTRODUCTION
1.3 Instrument Display
Figure 3
Item Description
1
Secondary display
2
Battery charge indicator icon
NOTE: The icon becomes animated when the charger is connected.
3Keyboard beep indicator
Keyboard lock indicator
5Datalog status indicator
Sensor initializing indicator
7
Primary display
8Status message display area
Table 2
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MDM300 User Manual
7
INTRODUCTION
1.3.1 Display Units
Absolute Humidity
•3
Moisture Content
•
•W 2 2
Dew point
•
• °F
•
Relative Humidity (%)
Mixing Ratio
•2 2
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MDM300 User Manual
8
INTRODUCTION
1.3.2 Status Display Indications
‘
<
°
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MDM300 User Manual
9
INSTALLATION
2 INSTALLATION
2.1 Safety
!It is essential that the installation of the electrical and
personnel.
2.2 Unpacking the Instrument
Figure 4
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MDM300 User ManualINSTALLATION
2.3 MDM300 Accessories
gas ports (1 and 2) as shown in
as a loose spare in the accessory pack (see Section 2.5).
Figure 5
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MDM300 User Manual
12
INSTALLATION
2.4 Operational Requirements
2.4.1 Environmental Requirements – MDM300 Instrument
2.4.2 Charger Electrical Requirements
2.5 Instrument Gas Connections
!
POSSIBLE INJURY! The tubing, valves and other apparatus
attached to this instrument must be adequate for the
maximum pressure which will be applied, otherwise physical
injury to the operator or bystander is possible.
A
Dew point at Gas Inlet port Gas Outlet port Sample gas
pressure
Table 3
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