© Edwards Limited 2007. All rights reserved. Page 1
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Introduction
D357-25-880 Issue E
1Introduction
1.1 Scope of this manual
This manual provides installation, operation and maintenance instructions for the Edwards ASG (Active Strain Gauge).
You must use the ASG as specified in this manual.
Read this manual before you install and operate the ASG. Important safety information is highlighted as WARNING
and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment or process.
The unit used through this manual conforms to the SI international system of units of measurement.
The following symbols appear on the ASG:
1.2 Description
The ASG, shown in Figure 1, is a strain gauge and gauge controller in a single compact unit. The measurement range
of the ASG-1000 is 1000 to 1 mbar. The range of the ASG-2000 is 2000 to 1 mbar.
The ASG requires a 13.5 to 36 V d.c. power supply: it has a 0 to 10 V d.c. linear analogue output which is related to
pressure. The ASG is compatible with all of the Edwards AGCs (Active Gauge Controllers) and with the ADD (Active
Digital Display). Alternatively, you can use an independent power supply for the ASG and can read the ASG output
signal with a voltmeter or an analogue-to-digital converter. A standard Active gauge cable plus an ASG adapter cable
are used to connect the ASG to an AGC or ADD. These are available as accessories (refer to Section 7.2). To connect
to an electrical supply and voltmeter, the 4-way connector on the gauge head can be used.
A gauge identification signal is incorporated in the adapter cable: this is used by Edwards AGCs to identify which type
of active gauge is connected.
1.3 Gas dependency
The pressure sensing technique depends on the deflection of a stainless steel diaphragm. The measurement is
therefore completely independent of gas type.
Warnings are given where failure to observe the instruction could result in injury or death to
persons.
Warning - refer to accompanying documentation.
From August 2005, Edwards will offer European customers a recycling service.
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