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3
Operation
Before continuing with the calibration procedure,
determine which of the two Normal output modes is
best for the control scheme. Filtered output holds a
stable 4 mA signal within a dead-band range while
the non-filtered output allows the signal to be seen
without any output limitations.
After this output mode choice is made, continue
through Steps 1—3 of the Calibration Procedure. As a
first step, the 4 mA output is matched to the signal
input device being used as a control panel. After this
is accomplished, Step 2 (Zero Calibration) and Step
3 (Span Calibration) can be completed in that order.
Filtered Output Mode
Each unit is equipped with a filtered output or "dead
band" output mode which locks the output at 4 mA
for signal readings of 4 to 4.6 mA. This masks
surrounding abrupt adverse environmental transients
that would cause a small short-term anomaly on the
4 mA resting point for a near 0 ppm reading of the
target gas. In this mode, the yellow "system" LED will
be ON. See the following example.
LED
SEQUENCE
POWER
G
SYSTEM
Y
CALIBRATE
Y
FAULT
R
mA FAULT
R
SOURCE
G
ATMOS
G
Manning AirScan-iR Refrigerant Sensor
continued
OFF
OFF
OFF
N/A
19100 AirScan-iR-ind 05/2006 REVA Copyright © 2006 Manning Systems, Inc. All Rights Reserved.
Non-Filtered Output Mode (no signal deadband)
Start: Press and hold both the "zero" (S1) and
"span" (S2) buttons simultaneously for one second or
until the "system" LED begins to blink slowly. See
example below.
This mode will allow any anomalies to be transmitted
from 0 to 27 mA on the output. This mode is also
used in the upcoming Simple Zero Test procedure.
LED
SEQUENCE
G
POWER
SYSTEM
Y
CALIBRATE
Y
OFF
FAULT
R
OFF
R
OFF
mA FAULT
SOURCE
G
ATMOS
G
N/A
Exit: To revert back to "dead band" mode, repeat
the same button press procedure above. This button
press sequence will toggle between modes (filtered
to non-filtered).
16
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