Calibration Using Magnetic Switch
The Open Path Eclipse provides an onboard magnetic
calibration/reset switch for non-intrusive calibration
capability. The magnetic switch is actuated by holding
a calibration magnet at the specified located on the
device bulkhead. See Figure 2 for switch location. An
onboard tri-color LED provides status indication during
calibration.
For zero calibration, the magnetic switch must be
actuated for 2 seconds to initiate calibration (signaled
by a solid red LED). Upon initiation, the OPECL
automatically performs the zero calibration adjustment,
and then signals with a green LED when this operation
is complete.
Digital Communication Calibration
MODBUS communication may be utilized to initiate
OPECL calibration (consult factory).
DETAILED CALIBRATION PROCEDURE USING
MAGNETIC SWITCH
Zero Calibration
1. Apply magnet for 2 seconds minimum to initiate
calibration.
A. The onboard LED turns to steady red.
B. The current output decreases to 1 mA.
2. When zero calibration is complete:
A. The onboard LED changes from steady red to
steady green.
B. Calibration is complete and current output
returns to 4 mA.
MAINTENANCE
ROUTINE INSPECTION
The Open Path Eclipse detector should be inspected
periodically to ensure that external obstructions such as
plastic bags, mud, snow, or other materials do not block
the path and thereby impair the performance of the
device.
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.
PROTECTIVE CAPS AND COVERS
Ensure that the HART Communication Port cover and
the wiring compartment cover are installed and fully
engaged.
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