Meriam MFT 4010 Modular Calibrator_HART Communicator - Manual (Page 19)

14
APPLICATIONS
Gauge Pressure Calibration
The diagram below shows two typical set-ups for calibrating a gauge pressure unit under test. If the process is
a liquid, it is vital that the gauge under test be isolated and drained. If liquid enters the xDN module, damage to
the sensor can occur. To use an xDN sensor, connect the pressure source to the high-pressure port of the xDN
sensor. Vent the low-pressure port to atmosphere.
When calibrating a gauge pressure unit using an xGI sensor, the connection is the same with the exception that
the xGI sensor does not have an external vent to atmosphere.
In some cases the actual process may be used as the pressure source for calibration. If you choose to use the
process to perform the calibration, make sure the process is compatible with the sensor used, and that it
provides a stable pressure. If your process has a fluctuating or pulsating pressure, use of an external pressure
source is recommended to ensure the accuracy of your measurements and calibration.