E-DWT-10000-AF OPERATION AND MAINTENANCE MANUAL
© 2008 DH Instruments, a Fluke Company
Page 22
3.5
PRESSURE GENERATION AND ADJUSTMENT
E-DWT-10000-AF has three means for generating and adjusting pressure, including filling and priming
the test system.
The reservoir pump is used to fill and prime the test system (see Section 3.5.1). It is important to remove
air from the test system by filling and priming it before using the variable volume to generate pressure.
Failure to fill and prime will result in the need to use multiple variable volume strokes to generate
pressure.
The variable volume is used for pressure generation and rough pressure adjustment (see Section 3.5.2).
The test shut off and fine adjust valve are used for fine pressure adjustment (see Section 3.5.3).
3.5.1
FILLING AND PRIMING, RESERVOIR PUMP
It is important to remove air from the test system by filling and priming it before using the
variable volume to generate pressure. Failure to fill and prime will result in the need to use
multiple variable volume strokes to generate pressure.
The reservoir pump is designed to push oil through the E-DWT and out the TEST port into
the test system. It can also be used to generate an initial pressure, saving variable volume
stroke.
To fill and prime the test system, prior to generating pressure with the variable volume,
proceed as follows:
See Figure 9 and Figure 10 for an E-DWT schematic and view when following this procedure.
Leave an open purge point (for example a loose fitting) at the highest point possible in
the test system that is connected to the E-DWT.
Open the reservoir shut off valve to connect to reservoir from the test system.
Position the reservoir cap correctly by rotating it CW until the reservoir vent valve is at the
CLOSE position. Do not overtigthen, do not CW beyond CLOSE position.
Be sure that the reservoir cap vent valve is open (loosened CCW).
If not already open, open the TEST shut off valve to connect the E-DWT to the test
system.
Pull the reservoir handle pump up slowly to fill it with oil from the reservoir. Then push
the handle down firmly with moderate speed to seal the tip of the pump against the
reservoir seat and inject oil into the E-DWT and out the TEST port.
Repeat while observing the open purge point in the test system. When only oil and no
air comes out of the purge point, close and tighten the purge point.
If desired, repeat to set an an intial pressure with the reservoir pump.
Be sure the variable volume is already filled and in the start position (Section 3.5.2,
- ), and the reservoir shut off valve is open.
Press down on the pump handle but do not release your downward force when the pump
gets to end of stroke or becomes to difficult to push down. While maintaining the
downward force on the pump handle, close the reservoir shut off valve to capture the
priming pressure.
Do not attempt to generate greater than 100 psi (700 kPa) using the reservoir priming
pump.
