Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 26)

24 95-8556 10.1
OpTICS ClEaNINg
Cleaning of the OPECL optical surfaces is normally
required only if an optical fault is indicated.
Thoroughly douse both window surfaces using a liberal
amount of isopropyl alcohol to clear away contaminant
particles. Repeat the alcohol flush to remove any
remaining contaminants.
WarnIng
Bypass/Inhibit: Volatile organic compounds in
cleaning solutions could cause false alarms.
pROTECTIvE CapS aND COvERS
Ensure that the HART Communication Port cover and
wiring compartment cover are installed and fully engaged.
tRoublEShootinG
A Fault status is indicated by a yellow LED and also by
the 4 to 20 mA output. Refer to Table 5 for assistance
in correcting malfunctions with the Open Path Eclipse
Detector.
fault Condition Corrective action
Low 24 volts 24 vdc operating voltage is out of range. Verify proper wiring to the detector and
correct voltage output from the power source. Power supply faults are self-clearing
when the condition is corrected. If the fault does not clear, consult the factory.
Dirty Optics Perform cleaning procedure, then recalibrate as required. (Refer to “Maintenance” for
details.)
Calibration Fault If the calibration process is allowed to time-out, the fault is set and can only be reset
with a successful calibration.
Negative Signal Output This fault is indicated when the signal output drops below 0.5 LFL-M. Normally
detection capability is not compromised in this condition. The device was probably
zero calibrated with background gas present. If the condition persists, purge with clean
air and repeat the zero calibration.
Calibration line active at start-up The only way to clear this fault is to correct the wiring and reapply power. Be sure that
the calibration line is not shorted and that the calibration switch is open. If the fault
does not clear, consult the factory.
EE Error If power is interrupted while the unit is updating its internal data logs, an EE Error may
occur. Cycling power will correct this fault.
Other Faults Consult the factory.
Table 5—Troubleshooting Guide