DH Instruments E-DWT-H, Руководство по эксплуатации и обслуживанию

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E-DWT-H OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 24
A
Reservoir vent valve
B Priming pump
C Reservoir
D
Lo Q-RPT pressure relief valve
E Lo Q-RPT (ref pressure transducer)
F Hi Q-RPT (ref pressure transducer)
G
TEST port 1 (top)
H TEST port 2 (rear)
I Test shut off and fine adjustment valve
J
Lo Q-RPT shut off valve
K Reservoir shut off valve
L Variable volume
Figure 12. E-DWT-H with dual Q-RPTs hydraulic schematic
3.5 Pressure Generation And Adjustment
E-DWT-H 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 is used for fine pressure adjustment (see Section 3.5.3).