Continuous Optical Path Monitoring - COPM Circuitry

A self-testing feature called Continuous Optical Path Monitoring (COPM) checks the optical path, the detector(s), and the related electronic circuitry once every 2 minutes. If foreign material on the front surface of the FL5000 blocks the COPM light from reaching the detector(s) for four minutes, the unit will indicate FAULT.

The optical FAULT outputs are a signal, de-energizing of the FAULT relay, and Modbus (RS-485) output signal. If in the 'HART 1.25 mA’ setting (default), the FL5000 provides a 2.0 mA fault output. If in the ‘HART 3.5 mA’ setting, the FL5000 provides a 3.5 mA fault output. The setting can be selected via HART or Modbus command.

After a COPM FAULT, a COPM check is performed every twenty seconds. The COPM will resume a once per 2-minute check only after the obstruction is removed. For general information and current levels go to Analog Output.

NOTE: Because the optical path is checked once every 2 minutes and requires two check failures to produce a FAULT, it may take up to 4 minutes for the unit to detect an obstruction.

WARNING! 

Dirty or partially blocked windows can significantly reduce the detector’s field of view and detection distance.

Failure to follow this warning can result in serious personal injury or death.

NOTE: Flame detector will still perform its safety functions, if possible, in COPM FAULT.