1. INTRODUCTION
Page 1
© 2009 DH Instruments, a Fluke Company
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1.1
PRODUCT OVERVIEW
PPCH is a stand-alone, pressure controller intended to precisely generate, adjust and control hydraulic
pressure into a closed volume as is commonly needed for the calibration and testing of pressure
measuring instruments. It has been designed to provide very high performance combined with maximum
versatility and ease of use.
PPCH can be equipped with a low cost utility sensor for pressure monitoring or one or two Quartz
Reference Pressure Transducers (Q-RPTs) to allow it to set and measure pressure with higher precision
and very low measurement uncertainty. Up to four external Q-RPTs in one or two external Reference
Pressure Monitors (RPM4s), can also be integrated into a PPCH system. A barometer is also included
for atmospheric pressure compensation of gauge mode measurements and as a reference for AutoZero
in absolute measurement mode.
PPCH generates high liquid pressure internally using a hydropneumatic pump driven by a drive air supply.
Pressure control is achieved by servo-motor controlled, high pressure needle valves and a thermal
pressure control system.
PPCH is controlled locally by the operator using a front panel display, keypad and function keys or
remotely by a computer using ASCII character command strings over an RS232 or IEEE-488.2 interface.
PPCH models are available to measure and control pressure in ranges from as low as 20 MPa (3 000 psi)
to 200 MPa (30 000 psi) in absolute and gauge measurement modes.
