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Personal Ozone Monitor Manual Rev. E-2
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The linearity error should not be greater than 5%. If the error is greater than 5%, the
accuracy of the flow dilution should be checked before assuming that the instrument is
not linear. Note that the inherent linearity of the POM is better than the error
calculated in this linearity check due to the uncertainty introduced by the flow
measurements.
11.4.4. Intercomparison Test
Comparison of the calibration setup with other ozone standards is a good check of the
overall accuracy of the setup. If measurements from another ozone standard are
found to deviate from the calibration setup greater than the instrument specifications,
one of the calibration setups is not accurate.
12. CALIBRATION PROCEDURE
A multipoint calibration should be performed within the calibration frequency, any time
major disassembly of components is performed, or any time the zero or span checks
give results outside of the acceptable limits. The instrument may be returned to 2B
Technologies for calibration service. Alternatively, the user may perform the
calibration using the suggested procedure below.
12.1. Instrument Preparation
1. Turn on the Personal Ozone Monitor and allow it to stabilize for a minimum
of one hour.
2. Enter the calibration menu (
Main Menu / Cfg / Cal / O3
) and set the zero
(Z) value to 0 and the slope (S) value to 1.00.
3. Connect the Personal Ozone Monitor to the manifold on the ozone
calibration setup. If a particle filter will be used in normal operation, the
calibration must be performed through the filter. The manifold must be
vented to atmosphere so that pressure does not build up in the calibration
setup. Connection of the POM directly to a pressurized output of any
device can damage the instrument.
4. Verify that the flow rate into the manifold is greater than the total flow
required by the Personal Ozone Monitor plus any other flow demand
drawing from the manifold such as a UV photometer or ozone transfer
standard.
12.2. Measurement of Zero Air
1. Verify that the zero air supply is on and the ozone generator is off. The
same zero air supply used in the ozone generator must be used in the zero
air measurement.
2. Allow the POM to sample zero air until the response is stable.
3. Record the average zero air response.