PROGRAMMING OF IAQRAE
4-6
The CO2 sensor zeroing requires a CO2-free gas source, such
as a cylinder of dry air, nitrogen, or 10 ppm isobutylene. The
CO2 sensor is typically spanned with 5,000 ppm CO2.
The RH and temperature sensor s need far less frequent
calibration than the other sensors. The RH sensor uses dry gas
(10% relative humidity) as the zero gas, such as dry air,
nitrogen, or 10 ppm isobutylene. The span calibration uses
>90% RH gas, obtained by bubbling the gas supply through
pure water.
The temperature sensor does not need zero calibration. The
span temperature is set to the ambient temperature as
measured by a thermometer.
The Calibration Menu contains the following submenus:
Fresh Air Calibration?
Multiple Sensor Calibration?
Single Sensor Calibration?
Modify Span Gas Value?
Change VOC Span Gas?
