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Rev: 1117
P/N: n/a
ECO: n/a
7.2 Calibration
PTs of series MDT 420/460 have an internal calibration signal. Connecting
terminals E and F switches the calibration signal to the signal output. It is 80% of the
full scale pressure of the transmitter.
Calibrate in pressureless state and at room temperature. Other
ambient temperatures will corrupt the signal.
Do not change the installed position of the PT after calibration. If
the position is changed you must re-calibrate the PT.
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Connect a meter or suitable display unit to the signal output.
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Set the display unit or external amplifier to pressureless state (zero point).
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Connect terminals E and F. The calibration signal is connected to the output.
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Set the calibration value (80% of nominal pressure) on the display unit or
external amplifier.
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Check the zero point setting on the display unit once again.
7.3 Zero adjustment
For PTs of series MDT 420 x/460 x, adjust zero at operating temperature!
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Wait until a steady operating temperature is reached at the pressure sensor.
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Set the zero point on the display unit or external amplifier.
7.4 Operation
Before starting the machine, wait until the melt medium at the
diaphragm of the PT has reached its operating / processing
temperature. If the machine is started before the medium reaches
its operating temperature, the PT will be damaged. If it is hard to
tell when the operating temperature has been reached, use a
combined TDT PT with thermocouple.
