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AirScan iR - Industrial
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.
Figure 21. Filtered output mode
16
Non-Filtered Output Mode (no signal dead-
band)
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.
Figure 22. Non-filtered output mode
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).
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