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Multi-Channel Combustible Monitor
Channel Modules
System
Chassis
Control Unit
Introduction
1.1
Overview
The Teledyne Analytical Instruments (TAI) Model 1220 is a multi-
channel system that can be used for determining the concentration of com-
bustible gases in an atmosphere at a number of remote locations, and pro-
vide alarm information when the combustible gas level exceeds predeter-
mined limits at any one or all of the remote locations.
The combustible gas content of the atmosphere is determined by a
number of remotely located detectors that may be strategically placed to
monitor the atmosphere surrounding their location.
The system is designed to provide indications of the state of each
detector and to actuate individual external alarm indicators as well as alarms
common to all channels. The alarms are user-configurable.
1.2
Description
The 1220 system is comprised of a System Chassis, Control Unit,
Channel Modules, and Remote Sensors. Each System Chassis contain one
Control Unit and up to eight Channel Modules. Each Channel Module
monitors up to two remote sensors. Since the sensors are designed for
installation in hazardous locations and are suitable for use in NEC Class I,
Division I, Groups B, C and D areas, they are (generally) located in an area
away from the 1220 System.
Teledyne Analytical Instruments
Model 1220 System
Introduction 1
1-1
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