Fluke 718-300G Fluke 718 Users Manual - Page 18

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