IQM 60 V5 Pump Revision October 2010
13
Gas
Span Point / ppm
O3 0.100
NO2 0.100
CO 25
VOC (isobutylene)
10
NMHC (isobutylene)
10
CO2 1000
PID (isobutylene)
10
Certified calibration standards that can be used with the IQM include certified gas bottles, diluent
calibrators, or ozone calibrators.
5.1.4.2 Span calibration procedure
1. Perform zero calibration.
2. Connect a source of span calibration gas to the IQM through the sample port. Use a T fitting to
ensure the IQM is sampling the gas flow at atmospheric pressure. The span gas flow should be at
least 1.5 LPM (check there is excess flow at the exhaust of the T fitting).
3. Allow the IQM to sample the gas until a stable reading is obtained (about 30 minutes).
4. Adjust the IQM60 sensor gain factor to set the correct concentration reading
Calibration -->Calibrate Gain-->enter password “password”--> select gas--->enter new gain factor
new Gain factor =
old Gain factor x Span gas concentration / AQM60 gas reading
Please note:
The change is logged in the EVENTLOG file on the SD card.
Example of Span Calibration Equipment
Calibrator
Calibration
Gas
zero
air
T fitting
exhaust
RS232 serial
cable
nafion
humidifier