Inhibit Level Selection - Honeywell Sensepoint XCL Installation Manual

Inhibit Level Selection

Current Source/Sink 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
mode. In the case of oxygen versions only, 17.4 mA is used.
2) With this switch in the lower position, a current of 2 mA is output in inhibit
mode on all versions.
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
output drives current through the controller sensing circuit.
2) Detector source mode: With this switch in the lower position, the analog
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
17