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CAUTION: The Model 610A Controller is easy to install and operate. However, one
should fully read and understand this manual before attempting to place t he
system in service.
Figure 1: Model 610A Controller
1.3 Controller
The Model 610A Controller is a four-channel system where the controller continuously
monitors the inputs of four sensors. The sensors are monitored independently (i. e. they
are not scanned, nor are the signals summed).
Each channel has the following:
• Constant current sensor drive circuit
• LED indicators for High, Low, Fault, Calibration, and Setup
• Mode Button, accessed by using a small screw driver
• Digital Display in %LEL
• High, Low and Fault relays
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