NOTE
During alignment adjustment, the HART field
communicator may occasionally display a
message stating “Non-zero status codes found.
Ignore the next 50 occurrences?” When this
occurs, enter “Yes”, and continue the Fine
Alignment procedure.
10. Tighten all mounting bolts to 20 lb.-ft. minimum with
care not to disturb the alignment. The telescope is
useful during this process to give a visual indication
to judge the affects of the tightening process on the
alignment.
11. Perform a zero calibration on the OPECL receiver
module.
12. Upon completion, the OPECL receiver should
produce a 4 mA output signal and a green LED
indication. If not, repeat steps 7 and 8.
13. Bypass all system alarms and confirm proper
operation by installing the optical test film p/n
007902-001 into the light beam and checking for a
corresponding signal output level of 1.2-1.8 LFL-
meters on the HART Field Communicator Process
Menu screen. The alarm condition should clear
when the film is removed from the beam.
14. Confirm proper operation by blocking the light beam
with a solid object such as cardboard until a beam
block fault is generated.
CALIBRATION
CALIBRATION OVERVIEW
Although routine calibration of the Open Path Eclipse is
normally not required, the device supports non-intrusive
field zero calibration capability. Span calibration is not
required.
Zero Calibration
Zero Calibration is a one-step process consisting of
clean air (zero) condition adjustment only, which is
performed automatically by the device. This procedure
adjusts the "clean air" signal output only, and is normally
used if the 4 milliampere signal level has drifted. The
cause of drift is typically due to the presence of
background gas during calibration. Ensure that the
optical path is clear of hydrocarbons prior to calibration
initiation to ensure an accurate zero (clean air)
condition.
IMPORTANT CALIBRATION NOTES
NOTE
Ensure that the detector has been operating for at
least two hours before calibrating.
NOTE
Always ensure that the OPECL optics are totally
free of all hydrocarbons before initiating calibration.
CALIBRATION INITIATION
Calibration may be initiated by any of the following
means:
• The onboard magnetic calibration switch
• Digital communication via MODBUS communication
(consult factory for details)
• Remote calibration line.
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