Inhibit Level Selection; Current Source/Sink Selection - Honeywell Sensepoint XCL Installation Manual

Fixed gas detector

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Inhibit Level Selection

Use the inhibit switch to set the level of current which is required when

inhibit is active.

1) With this switch in the upper position, a current of 4 mA is output in inhibit

2) With this switch in the lower position, a current of 2 mA is output in inhibit

Use the current source/sink switch to choose between source mode and

sink mode.

1) Detector sink mode: With this switch in the upper position, the analog

2) Detector source mode: With this switch in the lower position, the analog

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mode. In the case of oxygen versions only, 17.4 mA is used.

mode on all versions.

output drives current through the controller sensing circuit.

output draws current through the controller sensing circuit.

NOTE

The load resistance of the controller must be between 33 Ω and

250 Ω. When the mA output is not being used, a 33 Ω, 0.125 W load

resistor should be connected between terminal 3 (4–20 mA) and

terminal 2 (0 V) for source mode or terminal 1 (+24 V DC) for sink

mode. Failure to do so will cause the unit to enter a fault condition.

Installation

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