© Edwards Limited 2020. All rights reserved. Page 1
Introduction
D14643880 Issue L
1 Introduction
1.1 Scope of this manual
This manual provides installation, operation and maintenance instructions for the Edwards Active Inverted Magnetron
Gauge. Read this manual before attempting to install and operate the gauge.
This manual contains essential safety information which supplements the safety features of the gauge. Safety
procedures are 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 units used throughout this manual conform to the SI international system of units of measurement.
The following symbol is on the AIM gauge:
1.2 General
The family of active vacuum instruments is a new generation of stand alone units which combine gauge head and
controller in one active unit.
The Active Inverted Magnetron (AIM) gauge is a cold cathode ionisation gauge. The pressure is measured indirectly
as a function of the current flowing in a Townsend discharge maintained within the body tube.
There are two gauge variants, AIM-P-NW25 and AIM-PL-NW25. The body tube of the gauges terminate in an NW25
flange.
The AIM-PL-NW25 has a very low external magnetic field applicable for use with sensitive analytical instrumentation.
Each gauge requires a 13.5 - 36 V power supply, the pressure reading can be monitored with a simple voltmeter or
the analogue to digital converter of a data acquisition system.
The design of the gauge incorporates features to improve both start up and operation in humid atmospheres, as well
as self monitoring fault detection circuitry.
A set-point output is also provided. The user adjusts the operating pressure of the set-point output using a
potentiometer accessed through the end cap.
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
persons.
Edwards offer European customers a recycling service.
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