AQ EXPERT Instruction & Operations Manual
Version 1.13
Page 31 of 63
Calibration. See Section C below under Calibration Apparatus for more information on
the Moisture Exchange Tube.
ZERO CO
2
: This will set the zero point of CO
2
.
You must use cylinder of ZERO AIR
for CO
2
ZERO CALIBRATION
.
- Connect Cylinder to the
“Sample In” pump inlet connection on the front of the AQ
Expert using the optional accessories included in the CALIBATION KIT (Part #:
AQCAL). See CALIBRATION APPARATUS section below for how to connect.
- Open ZERO AIR Flow and let ZERO AIR flow to the AQ Expert for about 30
seconds. Verify that the CO2 is decreasing on the instrument. If the CO2 is NOT
decreasing, check the flow from the bottle to make sure its open
- After 30 seconds, Select the CALIBRATION button on the AQ Expert
- Scroll down using down arrow key and have the cursor (reverse color) point to
the line
Zero CO2 Sensors
- Press the
OK
key to execute a zero cycle of the CO
2
Sensor. The monitor will
count down from the Zero Time setting as explained above. This process should
take 30 seconds.
If no error messages appear at the end of the countdown, disconnect calibration
apparatus from the AQ Expert
2. ZEROing VOC & Gas Sensors using AQ CAL-ZF (with the exception of CO
2
)
in AMBIENT AIR CONDITIONS
Turn the unit and let the instrument WARM UP for a minimum of 5 minutes
.
If the sensor has been stored for a significant amount of time, it may have been
exposed to ambient conditions that may cause the sensor to exhibit a drifting
characteristic of the baseline signal. After prolonged storage, it is recommended to
power on the sensor for a period of time before operating it. The detector will clean itself
and the baseline signal will drop and stabilize. If the sensor is used on a daily basis, the
user should let it stabilize before use.
In order to zero the gas sensors (except CO
2
) in Ambient Air, insert the
AQ CAL-ZF
filter into the
“Sample In” inlet on the front of the AQ Expert and ensure that the opening
on the bottom end of the filter is not blocked. Allow the unit to run with the filter
connected for at least 30 seconds before continuing, this ensures that any potential
contaminants inside the unit are purged.
