PROGRAMMING OF IAQRAE
4-10
4.2.3 Single Sensor Calibration
This procedure determines the second point of the sensor
calibration curve for a single sensor. A standard reference gas
(span gas) is needed to perform this procedure. Table 2.2
(Alarm Limits and Conditions) shows the standard calibration
gas which is typically used as the span gas at the factory.
1. At the “Single Sensor Calibration?” screen, press [Y/+].
The display shows the sensors installed in the monitor with
the cursor blinking at “GO?” Press [Y/+] to select a sensor
and start the calibration. Or press [MODE] to move to the
next sensor location.
*CO
VOC
CO
2
RH
GO?
Temp
2. Calibration begins at the “Apply CO Gas Span = 50”
screen. Turn on the valve of the CO gas bottle to start gas
flow. The “Apply CO Gas” display will appear, and the
monitor will wait for the calibration gas to reach the sensor.
If the sensor does not detect any gas after about five
seconds, “No gas flow…” will appear and calibration will be
aborted. At this point, press any key to resume single
sensor calibration.
Apply gas or hit any key to start
3. Once the sensor detects the gas the “Calibration in
progress… 60” message will appear with the countdown
timer showing the remaining seconds. Once the countdown
timer reaches zero, the sensor name and calibrated value
will appear on the screen:
CO
cal’ed
Reading = 50 ppm
4. This completes the single gas calibration procedure for one
sensor. The monitor will return to the screen showing the
sensors installed in the monitor. The asterisk will have
automatically advanced to the next sensor.
5. The user may calibrate the next sensor, or press [N/-]
move to the next submenu, Modify Span Gas Value.
