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Adjusting and Calibrating the Differential Pressure
Transmitter using the MT220
Connecting the Differential Pressure Transmitter to the MT220
IM 767361-01E
To measure output from the differential pressure transmitter in terms of current,
connect the transmitter to the instrument and calibrate the transmitter.
differential
pressure
transmitter
Including the internal electric potential, the maximum allowable potential
difference for all input/output and ground terminals is 42 Vpeak. Ensure
that the potential of each terminal does not exceed the following values.
If this value is exceeded, damage to the instrument and injury to
personnel may result.
DMM measurement terminal: 18 Vpeak relative to ground.
• Do not apply an external voltage to the 24 VDC output connector. Doing
so may damage the instrument.
• If the 24 VDC output terminals are short-circuited or the load current
exceeds the limit (approx. 40 mA), -OL- is displayed and the output is
turned OFF.
• If the instrument is operated continuously from the Ni-Cd batteries with
the load current for the 24 VDC output exceeding 20 mA, the life of the
batteries will be shortened rapidly.
• Never apply a voltage exceeding the permitted maximum to the voltage
input terminals. Doing so may damage the instrument.
Maximum permitted input voltage: 30 VDC
• Never apply a current exceeding the maximum permitted input current
to the current input terminals. Make sure that the fuse used meets the
specified rating. Only use a fuse of the specified rating. For details,
refer to page 58.
Maximum permitted input current: 100 mADC
MT 220
24V
output
COM
terminal
current
COM
input
A
terminal
WARNING
CAUTION
39
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