Edwards APGX-H, Instruction Manual, Page: 7 / 32

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Introduction
D023-92-880 Issue F
1 Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards APGX-H (Linear
Convection Gauge). You must use the APGX-H as specified in the manual.
Read this manual before you install and operate the APGX-H. Important safety information is highlighted as WARNING
and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process
The following IEC warning labels appear on the pump:
The units used throughout this manual conform to the SI international system of units of measurement.
1.2 Description
The APGX-H is a thermal conductivity (Pirani) gauge that uses the principle of convection to improve sensitivity
around atmospheric pressure. It is capable of measuring pressure between 3 x 10
-4
mbar and 1333 mbar (2.3 x 10
-4
Torr and 1000 Torr). The APGX-H can measure the full range of pressures in any orientation. The tube is detachable
from the electronics housing and is available as a replacement part.
The APGX-H requires a 14.5 to 30 V d.c. power supply: it has a 0 - 10 V d.c. analogue linear output which is related
to pressure. The APGX-H is compatible with all of the Edwards AGCs (Active Gauge Controllers), and appropriate
versions of the Edwards TICs (Turbo Instrument Controllers) and AGDs (Active Gauge Displays). Alternatively you can
use an independent power supply for the APGX-H and read the APGX-H output signal with a voltmeter or an analogue-
to-digital converter.
The gauge has two LEDs that indicate the status of the gauge and that of the set-point output. The gauge also has an
error monitoring capability. In the event of an error being detected, an error voltage is sent to the pressure signal
output and the status LED indicates an error has occurred.
An 8-way electrical connector socket on the APGX-H ( Figure 1 , item 2) is used to connect the APGX-H to your
AGC, TIC, AGD or electrical supply and voltmeter. Electrical cables fitted with suitable connector plugs are available
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
people.
Warning - refer to accompanying documentation.
Warning - Edwards offer European customers a recycling service.