MPG1 USER’S MANUAL
© 2004-2007 DH Instruments, a Fluke Company
Page 8
3.1.4
RESERVOIR
The reservoir is a 362 cc (22.1 in
3
) acrylic vessel mounted inside the MPG1 housing. It is
accessed for filling or cleaning by a friction fit lid through the top of the housing. The reservoir
is connected to the RESERVOIR ISOLATION valve by flexible tubing. The reservoir lid can
used to force fluid out of the reservoir into the system connected to the OPG1.
3.2
OPERATION
Operation of the MPG1 can be divided into three common tasks: filling and priming the system under test
(See Section 3.2.1); generating and adjusting pressure (see Section 3.2.2); filling or emptying the variable
volume while maintaining test system pressure (see Section 3.2.3).
3.2.1
FILLING AND PRIMING THE SYSTEM UNDER TEST
Before attempting to use the MGP1 to generate high pressure, the system to which it is
connected should be as free of air as possible. Minimizing the air in the pressurized system
increases the effectiveness of the variable volume in generating pressure.
When the MPG1 is first connected to a system to be pressurized or if a new device is
connected to the system, proceed as follows to fill and prime the system before attempting to
generate high pressure:
Connect the MPG1 to the system under test or connect a new device to the system. If
possible, leave an open connection or cracked fitting at a high point in the system to be
pressurized.
Open the RESERVOIR ISOLATION valve and close the TEST ISOLATION valve.
Fill the variable volume with fluid from the reservoir by screwing it all the way out (CCW)
to its end of stroke.
Close the RESERVOIR ISOLATION VALVE and open the TEST ISOLATION valve.
Screw in the variable volume (CW) while observing the open point in the test system.
When air free liquid comes out of the open point, close the open point. If the variable
volume is screwed all the way in before the system is filled, repeat steps through as
many times as necessary.
The displacement of the variable volume of the MPG1-200M is 11 cc (0.7 in
3
).
Proceed to generate and adjust pressure as desired (see Section 3.2.1).
The reservoir cover may be used to rapidly displace a large volume of fluid from the reservoir
into the test system connected to the TEST ports(s). With the RESERVOIR ISOLATION valve
closed, remove the reservoir cover. Open RESERVOIR ISOLATION and TEST ISOLATION valves.
Then, while holding a finger over the vent hole in the cover, slowly push the cover into position on
the reservoir. The cover acts as a “piston”, pushing fluid out of the reservoir into the system.
3.2.2
GENERATING AND ADJUSTING PRESSURE
Before attempting to use the MGP1 to generate high pressure, the system to which it is
connected should be as free of air as possible. See Section 3.2.1 to fill and prime the test system.
Once the system to which MPG1 is connected, filled and primed, to generate and adjust
pressure proceed as follows:
