Calibrating A P/I Transmitter; Using The Internal Pump - Fluke 718Ex 30G User Manual

Calibrating a P/I Transmitter

To calibrate a P/I (pressure to current) transmitter, apply a
pressure to the transmitter and measure the transmitter's
current loop output. Pressure can be applied with the
Calibrator's internal pump or with an external pump.
XW Warning
To avoid a violent release of pressure or vacuum,
always depressurize the system slowly using the
pressure/vacuum release control before detaching
any pressure line.
When measuring the pressure of potentially
hazardous gases, care must be taken to
minimize the possibility of leakage:
Confirm that all pressure connections are
properly sealed.
Confirm that the Pressure/Vacuum
Release Control is in the closed position
(fully clockwise) and the
Pressure/Vacuum switch is in the +
position (fully clockwise).
If the Calibrator has been dropped or
subjected to rough handling, remove the
Calibrator to a safe area and check for
leaks to confirm the integrity of the
internal pneumatic components.

Using the Internal Pump

The internal pump can provide 30 psi (2.0685 bar) for
Model 718Ex 30G, 100 psi (6.895 bar) for Model 718Ex
100G, or 300 psi (20.68 bar) for Model 718Ex 300G.
The preferred use for the internal pump is shown in Figure
4, where the Calibrator displays pressure measured with
the internal sensor and provided by the internal pump.
The internal pump can also be used with certain Fluke
700PEx Series Pressure Modules. In this case, pressure
measured by the pressure module is displayed by the
Calibrator. Appropriate pressure modules for each
Calibrator model are identified in Table 4. Figure 5 shows
the internal pump being used with a pressure module.
XW Warning
If both a pressure module and the internal
sensor are connected, the Calibrator displays
ONLY the pressure module measurement.
Pressure Calibrator
Calibrating a P/I Transmitter
13