5
NOTE: Standard configuration is common relays (Figure 4).
Set points for High and Low alarms are adjustable from 5 to 60% LEL in the FM unit.
NOTE: A service-loop is necessary between the Model 610A Cont rol ler’s rear p anel
terminals and field/power wiring. This service loop permits the controller t o be
removed or slid forward for various adjustments and/or servicing. This is a
def inite advantage when replacing or changing a controller.
1.4 Sensor Assembly
Four sensor assemblies are normally supplied with the system. Thes e as sem blies are
comprised of the sensor, the sensor housing, and an optional splashguard.
NOTE: This sensor assembly is FM and CSA approved for Class I, Division 1 and
Division 2, Groups B, C & D hazardous areas.
On some occasions, different sensor housings may be supplied. The appropriate sensor
is provided if GMI is made aware of the gas or vapor that is to be monitored. Most
combustible gases may be monitored, including most hydrocarbons and hydrogen.
CAUTION: Sensors have a different sensitivity to each gas. GMI should be consulted i f
a sensor is expected to detect more than one gas. GMI can then
recommend the best calibration gas.
A variety of sensor covers may be purchased (Section 7.7.2). They provide extra
protection from wind, weather and dust.
NOTE: These sensor covers are not included in the Factory M ut ual ap proval f or t his
equipment.
In the event the system is to have less than four active channels, Part Number 10102-1
(sensor simulator) must be substituted for each unused channel. Otherwise, the FAULT
LED indicator for the unused channel will remain lit.
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