Model 610A
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. Normally, only a
periodic calibration check is needed to assure dependable performance. The system
operates in the range of 0-100% LEL (Lower Explosive Limit) and is calibrated for 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 verify the
feasibility of monitoring any gas or vapor other than those specified 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.
Any GMI low temperature catalytic bead combustible gas sensor assembly may be used
with the system.
NOTE: Sensor assemblies may be mounted outdoors in hazardous areas
(National Electric Code Class I, Division 1 and Division 2, Groups B, C & D).
They must be connected to the controller in accordance with the installation instructions
in this manual.
NOTE: The 610A is different 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 operation of these two
units.
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