3
1.0 Before Installation
1.1 Differences Between Models 610A and 610
610A differences:
• Wiring: Connectors must be rewired for 610A
• Auto-Calibration
• Front Panel: Polycarbonate with inlay
Refer to Section 2.0, Installation, and Section 3.0, Startup and Operation, for details.
1.2 General Product Description
The Model 610A Controller is a four-channel system designed to continuously monitor for
potential explosive concentrations of most combustible gases/vapors. Norm all y, onl y a
periodic calibration check is needed to assure dependable perf ormance. The system
operates in the range of 0-100% LEL (Lower Explosive Limit) and is calibrated f or a
particular gas or vapor. There are relatively few combustible gases, which should not be
monitored; however, as a precaution, GMI should always be consulted to verif y the
f easibility of monitoring any gas or vapor other than those specif ied at the time of
purchase.
The Model 610A Controller consists of a controller plus four sensor assemblies. The
controller is fully solid-state. It should be mounted in a weather protected, non-hazardous
area. Several GMI mounting accessories are available for panel, wall or 19-inch rack
installation. For hazardous areas, an explosion-proof housing is available for Class I,
Division 1 and Division 2, Groups B, C & D.
NOTE: Sensor assemblies may be mounted outdoors in hazardous areas
(National Electric Code Class I, Division 1 and Division 2, Groups B, C & D).
GMI catalytic bead sensors must be connected to the controller in accordance with the
installation instructions in this manual.
NOTE: The 610A is dif f erent than its predecessor the 610. The 610A calibration is
automatic where the 610 must be manually calibrated. Please check the
individual manuals for details about wiring, set up and operat ion of t hese t wo
units.
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