Calibrating A P/I Transmitter; Using The Internal Pump - Fluke 718-100US User Manual

718 Series
Users Manual
Table 5. Pump Features
Item Description
Pressure Rotate forward (clockwise) for pressure,
Vacuum backward (counter-clockwise) for
Switch vacuum.
Pressure Rotate fully backward (counter-
Vacuum clockwise) to release all pressure or
Release vacuum. (Rotate slightly for partial
Valve release.) Rotate fully forward (clockwise)
to close valve.
Fine Rotate either direction for precise
Adjustment adjustment of applied pressure or
Knob vacuum. Full rotation is about 30 turns.
Internal Increase pressure on the inward stroke.
Pump In vacuum mode, decrease pressure on
the outward stroke.
10
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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. You can apply pressure with the
Calibrator's internal pump or with an external pump.
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.

Using the Internal Pump

The internal pump can provide the rated pressure for all
Model 718 Calibrators.
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 700
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 6 . Figure 5 shows the internal pump
being used with a pressure module.
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