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Documenting Process Calibrator
Using Source Mode
47
Sourcing Pressure
The calibrator provides a source pressure display
function that requires the use of an external pressure
hand pump. Use this function to calibrate instruments
that require a pressure source or differential pressure
measurement. See Figure 31 for information about
that application.
Pressure modules are available in gage or
differential types, depending on range. (See
“Accessories” near the front of this manual.) Gage
pressure modules have one pressure fitting and
measure the process pressure with respect to
atmospheric pressure. Differential pressure modules
have two pressure fittings and measure the
difference between the pressure applied to the high
fitting and the pressure applied to the low fitting. If
the low fitting is left open, the pressure module acts
as a gage unit.
To use the source pressure display, see Figure 17
and proceed as follows:
W WARNING
TO AVOID A VIOLENT RELEASE OF
PRESSURE IN A PRESSURIZED SYSTEM,
SHUT OFF THE VALVE AND SLOWLY
BLEED OFF THE PRESSURE BEFORE
YOU ATTACH THE PRESSURE MODULE
TO THE PRESSURE LINE.
CAUTION
To avoid mechanically damaging the
pressure module, never apply more than
10 ft.-lbs. of torque between the pressure
module fittings or between the fittings
and the body of the module. Always
apply appropriate torque between the
pressure module fitting and connecting
fittings or adapters.
To avoid damaging the pressure module
from overpressure, never apply pressure
above the rated maximum printed on the
pressure module.