MDM50 LP Version User’s Manual
Michell Instruments
13
MAINTENANCE
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Replace the locking screw and cable gland.
5.3
Filter Cartridge Replacement
Unscrew the gas inlet fitting to reveal the filter, which can then simply be removed for
checking or replacement.
5.4
Checking the MDM50 Electronics Calibration
Supply
4-20 mA
PIN 3
PIN 1
(GND)
Screen/Shield
Optional
Figure 5
2-Wire Connection - View Showing Rear of Connector Terminal Block
To verify if the display electronics are within calibration a 4-20mA current source can be
connected in place of the transmitter.
At 4 mA the display should show -60.0°Cdp ±0.5°C (-76.0°Fdp ±0.9°F)
At 20 mA the display should show +60.0°Cdp ±0.5°C (+140.0°Fdp ±0.9°F)
If the displayed values are outside of this range, please contact Michell Instruments'
Service Department.
5.5
List of Spares
P/N
Description
SSF-PF-10PK
Pack of 10 particulate filter cartridges
MDM50-BAT
Replacement battery pack
MDM50-CHR
Replacement battery charger
