Table of Contents
Advertisement
Calibration
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
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 19).
Figure 19. Board Component Layout
AirScan iR - Industrial
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!
Figure 20. Non-calibrated sensor or loss of factory calibration
15
Advertisement
Table of Contents
