DH Instruments PPC2 AF - 1 Introduction; Product Overview; Subassembly Description and Location; Front Panel Assembly

1. INTRODUCTION
Page 1 © 1998 DH Instruments, Inc.
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1.1 PRODUCT OVERVIEW
PPC2 AF is a high precision pressure controller/calibrator intended to apply and measure accurate values
of gas pressure for the calibration and testing of pressure measuring instruments.
PPC2 AF measures and controls pressures in the range of 0 to 1 000 psi (0 to 7 MPa) in both gauge and
absolute mode. Six pressure measuring ranges are available using two high accuracy reference
transducers and an on-board barometer. Internal valving chooses the appropriate transducer for the
desired range and protects the lower pressure transducer when working at high pressures. Pressures are
controlled by a pneumatic module consisting of fast and slow inlet and exhaust solenoid valves and
differential pressure regulators.
PPC2 AF can be controlled locally by the operator using a front panel display, keypad and special function
keys or remotely by a computer using ASCII character command strings over an RS232 interface.
A Self Purging Liquid Trap (SPLT) can be used to protect PPC2 AF from liquid contaminants in the device
or system being tested.
1.2 SUBASSEMBLY DESCRIPTION AND LOCATION
1.2.1 FRONT PANEL ASSEMBLY
1. Display
2. Multi-Function Keypad
3. Direct Pressure Control Keys
4. Remote Indicator
Front Panel
The front panel assembly provides a 2 X 20 vacuum fluorescent display of PPC2 AF
operating status and a membrane keypad for local user control.