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Operation
LED Indicators and Blink Sequence
Figure 6. LED Blink Sequence
SEQUENCE
1 sec. 2 sec. 3 sec.
SOURCE BLINK
SLOW BLINK
MEDIUM DOUBLE BLINK
FAST BLINK
CONTINUOUS ON
Green Power LED
•
Continuous ON when power is applied
Yellow System LED
•
Continuous ON during normal filtered output run
mode — "dead band" from 4 to 4.6 mA
•
Slow blink during normal non-filtered output run
mode
•
Fast blink indicating unit lost calibration data
•
OFF during 4/20 mA loop check
Yellow Calibrate LED
•
Continuous momentary ON for auto-zero mode
activation
•
Slow blink for 4 mA output calibration mode
•
Medium double blink indicates 4/20 mA loop
check .5 mA (low)
•
Fast blink for "span" calibration mode and
4/20 mA loop check 22 mA (high)
Manning AirScan-iR Refrigerant Sensor
continued
19100 AirScan-iR-ind 05/2006 REVA Copyright © 2006 Manning Systems, Inc. All Rights Reserved.
Red Fault LED (all scenarios produce a .5 mA
output)
•
Continuous ON indicates a failed source, low
signal, or circuit failure
•
Slow blink indicates the power supply DC 24V
input voltage is too low.
•
Medium double blink indicates sensor is outside
the operating temperature range.
•
Fast blink indicates the signal drifted below
4 mA and needs to be re-calibrated, only in non-
filtered output run mode (no dead-band).
Red mA Fault LED attempts to output .5 mA
fault signal
•
Fast blink indicates 4/20 mA loop failure or load
resistance too high
Green Source LED
•
One blink every 2 seconds indicates when
source is energized and also that the source is
not short circuited.
Green ATMOS LED
•
Continuous ON indicates ATMOS circuitry is
active or adjusting the enclosure's internal
environmental conditions for the sensor to
function reliably.
NOTES:
•
If the Source LED isn't blinking, do not proceed
until the condition is corrected.
•
If a Fault LED is lighted, immediately refer to
Fault Indicator Error Sequences (page 11) to
determine potential problem. Do not attempt
calibration if a Fault is indicated.
•
All status LED's are subordinate to Fault
indicators.
•
If an LED is indicated as OFF, it must actually
be OFF for proper sensor operation.
•
If an LED status is N/A (not applicable), that
LED indication may vary depending on other
operational factors.
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