AirTest TR9277-EO-B Benutzerhandbuch - Seite 9

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There is also an option to set a specific value for the
doing this is explained in detail below. It is important to note that any calibrations should be done so
that the air around the sensor is at the concentration to be used for calibration. Flowing calibrated gas
through a tube to the inside of the sensor is not a valid or accurate method of calibration.
For commissioning purposes, the best way to evaluate the sensor is to compare the sensor to a hand
CO
held
sensor that has recently been calibrated at approximately the same altitude (± 500 ft).
2
7.3.3 Making Adjustments To The CO
1.
Enter into the test mode selection menu using the function mode button, holding in for about 6
seconds. The Green LED will begin to blink.
2.
To enter the CO
then, press and hold the test mode button for 6 seconds.
3.
The LED will indicate if ABC is on (Green LED) or if it is off (Red LED).
4.
Use the test button to cycle through the 4 different adjustment options indicated by the 4 LED. To
select an option press and hold the test button for 6 seconds.
Green LED = enable ABC, will self-calibrate every 3 weeks, dependent upon continuous
•
operation via battery or solar power
Amber LED = will continue to self-calibrate every 3 weeks plus will force an immediate
•
calibration. Self-calibration takes < 2 minutes. The amber LED will blink at a fast rate during
this process. When complete the green led will blink 10 times and then the process will end.
Red LED = disable self-calibration
•
Red + Amber LEDs = calibrate to absolute value. Absolute value calibration allows the
•
user to select a CO2 value with 25 ppm resolution.
Green blinks = 500 ppm
o
Amber blinks = 100 ppm
o
Red blinks = 25 ppm
o
The sensor will display the current value (pressure compensated) in blinks once entering
into this mode (green then amber then red). The user must press the test mode button to
increase the ppm value or the teach button (on the back) to decrease the value (also
pressure compensated) in 25 ppm increments. The background ppm level is set to 420 ppm.
TR9277-EO Manual
Sensor:
2
adjustment mode the the test mode button until the Red LED begins blinking
2
CO
sensor to calibrate to. The process for
2
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