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3
Operation
Calibration
D
Before calibrating the unit, ensure the startup
procedure was followed and unit was powered on for a
minimum of 12 hours (with the enclosure door closed)
in the operating environment.
IMPORTANT NOTE: For environments where the
ambient temperature is less than 10° F, during the
calibration procedure, the door must be closed as far as
possible. This will ensure the sensor temperature will not
drop below the minimum operating temperature which
could adversely affect the programmed calibration
parameters.
There are only two adjustment pots and two
pushbuttons on the main board that are used for
programming the calibration parameters. See Section
B, Pushbutton Operation, LED Indicators, Adjustment
Pots and Test Points. Use Section B to familiarize
yourself with the pushbuttons S1, S2, adjustment pots
"zero", "span", Test(+), Test(—) and their locations on
the main board (see Figure 8).
Figure 8. Board Component Layout
ICSP Programming Port
Zero Adjust
Span Adjust
JP3
S1
ZERO
SPAN
S2
SIG
+24
GND
SHLD
JP1
TEST +
TEST -
Manning AirScan-iR Refrigerant Sensor
continued
Serial Port
Pushbutton S1
Rx LED
Tx LED
Pushbutton S2
JP2
Draw
Chamber
POWER
SYSTEM
CALIBRATE
FAULT
mA FAULT
IR SOURCE
ATMOS
ACTIVE
Tubing to
calibration point
19100 AirScan-iR-ind 05/2006 REVA Copyright © 2006 Manning Systems, Inc. All Rights Reserved.
In addition, the LED indicators and blink pattern
meanings are also summarized in this section. The
calibration procedure will require use and knowledge
of the following tools within the sensor:
•
"Zero" adjustment pot — adjusts output
calibration of the 4 mA nominal resting point
•
"Span" adjustment pot — adjusts the 20 mA
concentration level or unit span/sensitivity
•
Pushbutton S1 — used to initiate the auto-zero
function and program the 4 mA output
calibration
•
Pushbutton S2 — used to program the span
setting
In addition, there are four LED's used in the
calibration procedure. Yellow "system" and
"calibrate", and red "fault" and "mA fault" LED's
located on the main board are utilized as status
indicators during the calibration procedure and as
diagnostic and trouble indicators.
Non-calibrated Sensor or Loss of Factory Calibration
IMPORTANT: Upon power up, if the yellow "system"
LED is showing a fast blink pattern, the unit hasn't
been calibrated yet or has lost the factory calibration
and requires a full calibration before it can reliably
read the target gas. See the following example.
Should this occur, please contact Honeywell Analytics
for assistance!
LED
SEQUENCE
POWER
G
SYSTEM
Y
CALIBRATE
Y
N/A
R
N/A
FAULT
N/A
mA FAULT
R
N/A
SOURCE
G
ATMOS
G
N/A
15
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