MPC1-1000 and MPC1-3000 User’s Manual
3.
O
PERATION
3.1
GENERAL OPERATING PRINCIPLES AND INFORMATION
3.1.1
MPC1
This instrument manually controls pressures from vacuum to 1 000 psi (7 MPa) (MPC1-1000)
or vacuum to 3 000 psi (21 MPa) (MPC1-3000) through the use of valves, a variable volume
(VV) pump and a pressure gauge. Fittings for an outside source of pressure and vacuum are
located on the back panel as are a test connection and vent port. When pressures
(both positive and negative) are needed that are beyond the ability of the VV to generate
by itself, an outside supply of pressure and/or vacuum is required.
The test inlet valve is plumbed directly to the test connection and the high pressure chamber
of the VV. Opening this valve regardless of the position of the equalization valve will result in
an increase of pressure in the test system when pressure is applied to the valve. THIS MAY
RESULT IN AN OVER PRESSURE CONDITION OF THE TEST INSTRUMENT. PLEASE USE
CAUTION WHEN OPERATING THE TEST INLET VALVE.
3.1.2
VALVES
Two types of valves (needle and ball) are used in the MPC1. Two needle valves are used to
control large changes between pressures. A ball valve is used to select between a vacuum
source or an atmospheric reference (vent).
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© 2001 - 2007
DH Instruments, a Fluke Company
