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Power Up The MFM300
Press the POWER button until the display shows the Cooper logo, the remaining
battery life and the installed firmware. Press the LIGHT button to illuminate the
screen in low light conditions.
Power Down The MFM300
Press the POWER button until the display goes blank.
Display Modes
Normal Mode: Displays the measured values of all the probes currently connected.
Superheat Mode: Displays superheat or sub-cooling values. Requires a temperature
probe be installed in either T1 or T2 (or both) and optionally a pressure probe in U1
or U2 (or both). Press the SH button to enter Superheat mode. Press the SH button
again, or CANCEL, to return to Normal mode. See the section on measuring
system superheat/sub-cooling for further information.
Psychrometrics Mode: Displays psychrometric values. Requires a relative humidity
probe to be installed in either U1 or U2 (or both). Press the PSYCH button to enter
the Psychrometric mode. Press the PSYCH button again, or CANCEL, to return to
Normal mode.
The MFM300 will attempt to operate in the last mode it was in when powered off. If it
can not, the Normal mode is the default. If no probes are connected, the No Probes
message will appear on the display.
Display MIN, MAX and AVG Values
When in NORMAL mode press:
MIN button to display the lowest readings sensed by each probe.
MAX button to display the highest readings sensed by each probe.
AVG button to display the average readings sensed by each probe.
The active mode, MIN, MAX or AVG, will be indicated near the bottom of the display.
Pressing the same button again, or CANCEL, turns off the selected mode.
Disconnecting a probe will clear that probe's MIN, MAX, and AVG memory, but all
probes still connected will continue to be updated. All MIN, MAX and AVG memory is
lost when the MFM300 is powered down.
Measure Temperature
Install one, two, or three Cooper 10K thermistor probes into any of the three
temperature jacks: T1, T2 or T3. The MFM300 will sense the probe and display the
temperature measurement with the appropriate label.
Measure Temperature Difference (Delta T)
With two probes connected, press the DELTA button until Delta appears on the display.
The absolute temperature difference appears to the right of the horizontal bars that
point to the two temperature inputs being measured. Press the DELTA button again,
or CANCEL, to turn off the Delta T display. If three temperature probes are
connected, press the DELTA button again to display the next Delta T. With three
sequence is as follows:
temperature probes connected, the Delta T
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