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MDM300 User Manual
Michell Instruments
37
OPERATION
B
Standard Purge (Pressure Measurement)
1. Connect the MDM300 to the sample gas stream.
2. Adjust the flow rate, using the
outlet flow control valve
, to between
0.2 and 1.2 Nl/min (0.5...2.5 scfh). The inlet flow control valve should be
fully open.
3. Turn the instrument on - the initialization period begins automatically.
The page will show a countdown of the remaining initialization time. The
status display will read ‘
Initializing internal sensor
’.
4. After Initialization, the instrument will begin Measurement mode. During
the first few minutes of Measurement mode, the displayed moisture value
will drop rapidly below the actual moisture value, before returning to
a stable reading. The instrument display will show an initial measured
value, and the status display will show ‘
Measurement in progress
’.
5. Once ‘
Measurement in progress
’ has disappeared, the instrument is
close to the final dew point. Depending on the conditions, it may continue
to respond for a number of minutes before tracking the measured dew
point.
C
Enhanced Purge
1. Connect the MDM300 to the sample gas stream.
2. Adjust the flow rate, using the
inlet flow control valve
, to between 0.2
and 1.2 Nl/min (0.5...2.5 scfh). The outlet flow control valve should be
fully open.
3. Turn the instrument on - the initialization period begins automatically.
The page will show a countdown of the remaining initialization time. The
status display will read
‘Initializing internal sensor
’
.
4. Once 2-3 minutes of the initialization period have elapsed, close the outlet
flow control valve and fully open the inlet flow control valve. Then adjust
the flow rate using the outlet flow control valve to between 0.2 and 1.2
Nl/min (0.5...2.5 scfh).
5. After Initialization, the instrument will begin Measurement mode. During
the first few minutes of Measurement mode, the displayed moisture value
will drop rapidly below the actual moisture value, before returning to a
stable reading. The instrument display will show an initial measured
value, and the status display will show ‘
Measurement in progress’
.
6. Once ‘
Measurement in progress’
has disappeared, the instrument is
close to the final dew point. Depending on the conditions, it may continue
to respond for a number of minutes before tracking the measured dew
point.
Summary of Contents for MICHELL Instruments MDM300
Page 1: ...MDM300 Advanced Dew Point Hygrometer User Manual 97122 Issue 16 2 June 2022 ...
Page 19: ...MDM300 User Manual Michell Instruments 11 INSTALLATION 1 4 3 6 5 2 Figure 6 Accessories ...
Page 61: ...MDM300 User Manual Michell Instruments 53 APPENDIX B Appendix B Datalog Status Display ...
Page 64: ...MDM300 User Manual 56 97122 Issue 16 2 June 2022 APPENDIX C Appendix C FCC Declaration ...