Iaqpoint2 Calibration Procedure; Calibrating The Co Sensor - Honeywell VA201T Calibration Handbook

IAQPoint2 Calibration Procedure

Calibrating the CO
This option allows users to calibrate the sensor's span.
Note:
When calibrating a duct mounted unit, the unit must be removed from its base
to ensure proper calibration.
1. Enter the level 2 password. By default, 2967
2. Navigate to Calibrate > Calibrate Gas. This screen will flash every second
to indicate calibration mode
3. A message may be displayed indicating that Automatic Baseline Correction
(ABC) is enabled and calibration is not possible. If ABC is not desired, it can
be disabled in the Configure > Configure Outputs > Auto Baseline menu
4. Connect a cylinder of a test gas of known concentration to a 0.5lpm regulator
5. Connect the regulator's tube into the calibration port on the side of the
IAQPoint2 monitor
6. For Duct Mount version, remove display assembly portion from duct tube
before attempting calibration
7. The top line of the display shows the mode of the CO2 sensor. Verify that
this is "normal" and not some other message
8. The second line of the display shows the current concentration. Verify that
this shows a reasonable number. Since the calibration gas flow has not yet
been started, this should show an ambient CO2 concentration. It is normally
greater than 500 ppm in a room
9. Open the regulator's valve to start the flow of gas
10. Wait three minutes for test gas to purge all of the ambient air out of the sensor
11. Verify that the concentration reading stabilizes to match the cylinder CO2
concentration within ±200 ppm
12. Verify that the "Target" concentration matches the concentration of the cylinder
of test gas. If pure nitrogen is used, this should be zero. If needed, enter the
correct concentration by pressing [Target]
13. Press [Base Cal Now]
14. The mode display should show "in base cal" for about ten seconds
15. Verify that the mode display shows "base cal pass"
16. Verify that the concentration reading matches the target concentration ±30 ppm
17. Turn off the valve on the regulator
18. Verify that the test gas concentration rises to a reasonable value after about one
minute, reflecting the ambient concentration
19. Press [✓] and navigate back to the main menu. The main display may show a
fault for up to four seconds when exiting calibration mode. This is normal and is
not an indication of trouble
20. Disconnect the regulator from the gas cylinder.
21. IMPORTANT: For duct mount models, re-connect display to duct tube. Confirm
calibration port plug is reinstalled. If this is step is neglected, the sensor's sampling
IAQPoint2
Sensor
2
Calibration Handbook
89
Calibration Port