Michell Instruments MDM50, Руководство пользователя

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MDM50 LP Version User’s Manual
6 97475 Issue 2, April 2020
OPERATION
3.4 User Controls
Figure 2 User Controls
1 Digital Display
Indicates the measured dew point in °C from -60 to +20 (-76 to
+68°F).
Under certain conditions the following error messages may be
displayed:
ErrL = Transmitter under range
ErrH = Transmitter over range
Err I = Sensor fault or transmitter disconnected
2 Power Switch Switches the MDM50 ON or OFF.
3 Fuse
This 1A quick blow fuse provides protection for the display
electronics in the event of a fault with the charger or battery pack.
Another protection fuse is located on the display PCB.
4
NiMH Battery
Pack
Located in the top right hand corner of the instrument, it can be
accessed by removing two screws (5). The battery pack can be
recharged using the supplied charger, via the battery-charging
socket. See Section 5.6 for troubleshooting information.
The battery pack will charge if the instrument is switched ON or
OFF.
6
Analog Output
Socket
The MDM50 features an analog output socket that provides
a linear 4-20 mA current loop, scaled to -60 to +60°C (-76 to
+140°F) dew point. This allowed the instrument to be connected
to a chart recorder, data logger or PC to enable dew-point trends
to be analyzed over time. For wiring information see Section 3.5.
7 Gas Fittings
The MDM50 can be used for measurements at line pressure (up to
20 barg (290 psig)) or atmospheric pressure. Legris push fittings
are supplied for use with 6mm OD PTFE tubing or, optionally,
Swagelok
®
tube fittings for use with 6mm or ¼" OD stainless steel
tube. There is a 32mm particulate filter (99.5% removal of 0.1
micron particles) fitted as standard under the Gas In port position.