MPC1-1000 and MPC1-3000 User’s Manual
v
For additional pressures below atmosphere go to Step
q
.
For small pressure changes, it may be possible to reach the desired pressure using the VV
only, proceed to Step .
w
Open pressure equalization valve (pull valve outward).
OPENING THIS VALVE MAY RESULT IN A SUDDEN CHANGE IN THE TEST PRESSURE.
Ensure conditions are such that this either does not happen or that its effects
are
inconsequential.
Place VV piston at appropriate position, see Section 3.1.3.
Open test inlet valve (1) until the approximate desired pressure is reached.
Care should be taken not to overrange the test.
Close equalization valve (push valve inward).
Adjust VV knob until desired pressure is obtained (or until the piston floats when
connected to a piston gauge).
Maximum differential pressure across the VV piston is 150 psi (1 MPa). Pressures above
150 psi (1 MPa) will automatically open the equalization valve.
To continue increasing pressures, repeat Step
w
.
3.5.2
DECREASING PRESSURE
For small pressure changes, it may be possible to reach the desired pressure using the VV
only, see Step
r
below.
n
Open pressure equalization valve (3) (pull valve outward).
OPENING THIS VALVE MAY RESULT IN A SUDDEN CHANGE IN THE TEST PRESSURE.
Ensure conditions are such that this either does not happen or that its effects
are inconsequential
o
Place VV piston (2) at appropriate position, see Section 3.1.3.
p
Open test outlet valve (4) until the approximate desired pressure is reached.
q
Close equalization valve (push valve inward).
r
Adjust VV knob until desired pressure is obtained (or until the piston floats when
connected to a piston gauge).
s
To continue decreasing pressures, repeat Step
p
.
Page
11
© 2001 - 2007
DH Instruments, a Fluke Company
