Det-Tronics PIRECL Infrared Hydrocarbon Gas Detector PointWatch Eclipse - Manual (Page 24)

22 95-8526 14.2
Calibration initiation
Eclipse calibration may be initiated by any of the following
means:
• The onboard magnetic calibration switch
• The magnetic calibration switch in the remote
termination box
• HART communication.
Calibration using Magnetic Switch
1. onboard Switch and leD
The Pointwatch Eclipse provides an onboard
magnetic calibration/reset switch for non-intrusive
calibration capability. The magnetic switch is
located on the device bulkhead. See Figure 19 for
switch location. An onboard tri-color LED is also
provided to signal the operator when to apply and
remove calibration gas.
2. remote Switch and indicating leD
A special Remote Termination Box (Model PIRTB)
is available for initiating calibration from a remote
location. The PIRTB provides an internal magnetic
switch and indicating LED (LED is on/off only, not tri-
color). The PIRTB is provided with a clear window
on the cover, enabling non-intrusive calibration
capability.
Either magnetic switch must be actuated for 2 seconds
using a calibration magnet to initiate Eclipse calibration.
Upon initiation, the Eclipse automatically performs
the zero calibration adjustment, and then signals the
operator when it is time to apply calibration gas. Upon
completion of the span adjustment, the Eclipse returns
to normal mode after the calibration gas has cleared.
The indicating LED (either onboard LED or PIRTB LED,
if used) provides visual signals to the operator regarding
the proper time to apply and remove the calibration gas.
For Zero Only Calibration, the operator must re-actuate
the magnetic switch upon LED signal to apply calibration
gas. This action instructs the Eclipse to utilize the
previous span setting, and return to normal mode without
requiring application of calibration gas.
Digital Communication Calibration
HART, MODBUS or EQP communication may be utilized
to initiate Eclipse calibration. Refer to the appropriate
Appendix for details.
DetaileD Calibration proCeDUre USing
MagnetiC SwitCh
Refer to Tables 4 and 5 for a quick summary of the
standard calibration sequence.
1. Apply magnet for 2 seconds minimum to initiate
calibration.
A. The onboard LED turns to steady red.
B. The LED within the PIRTB (if used) turns on.
C. The Eclipse current output decreases from 4
mA to 1 mA when the default Eclipse calibration
routine is used.
2. When Zero Calibration is complete:
A. The onboard LED changes from steady red to
flashing red.
B. The LED within the PIRTB (if used) begins
flashing.
C. The Eclipse current output does not change
from the 1 mA level when the default Eclipse
calibration routine is used.
D. The operator should now apply the appropriate
calibration gas to the Eclipse if conducting
Normal Calibration.
E. If conducting Zero Only Calibration, the operator
should re-apply the magnet to the switch. This will
conclude the Zero Only calibration sequence.
3. When Span Calibration is complete:
A. The onboard LED changes from flashing red to
“off”.
B. The operator should now close the valve and
remove the calibration gas from the Eclipse.
NOTE
It is normal for the Eclipse LED to go off or turn
blank (no color displayed) until the calibration gas
is cleared from the optics chamber. Remove the
weather baffle if necessary to clear residual gas.
C. The LED within the PIRTB (if used) changes to
steady on.
D. The Eclipse current output does not change
from the 1 mA level when the default Eclipse
calibration routine is used.