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AirScan iR - Industrial
Modes of Operation
The Manning AirScanTMiR has various modes of
operation and calibration:
• Normal run mode with output filtering
• Normal run mode without output filtering
• 4/20 mA loop check
• 4/20 mA calibration to an external PLC or read-out
panel
• Neutral gas resting point or "zero" calibration mode
• Span calibration modes
Normal Run Modes
Normal run mode with output filtering
This mode outputs a signal from 4 to 27 mA with a
"dead band" from 4 to 4.6 mA. This "dead band"
masks small environmental anomalies that could
facilitate output signal fluctuations or transients
around the 4 mA resting point when the unit is not
sensing target gas.
Start: If the "system" LED is blinking slowly, press and
hold both S1 and S2 simultaneously for 1 second or
more until the "system" LED is continuous ON, then
release both buttons. If the "system" LED is blinking
fast, this mode cannot be engaged and the factory
needs to be contacted. See the following example.
Figure 13. Normal Run Mode with Output Filtering
12
Normal run mode without output filtering
This mode outputs a signal that nominally rests at 4
mA and can range continuously from 0 to 27 mA. Any
subtle changes in sensor response will be sent to the
mA loop output. This mode is entered automatically
when the calibration modes are activated. Some users
may wish to see the subtle anomalies in the signal
near the nominal 4 mA rest area.
Start: If the "system" LED is continuous ON, press
and hold both S1 and S2 simultaneously for 1 second
or more until the "system" LED is blinking slowly
then release both buttons to enter this mode. If the
"system" LED is blinking fast this mode is always
engaged and can only be exited by fully calibrating
the unit. See the following example.
Figure 14. Normal Run Mode without Output Filtering
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