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OX-TRAN Model 2/28 Operator's Manual
Appendix F: Permeant Sensor Adjustment
The Permeant Sensor in the OX-TRAN Model 2/28 is a Coulometric oxygen detector. The patented Coulox
sensor has a high degree of intrinsic accuracy. It is not necessary to calibrate a Coulox Permeant Sensor.
However, there are slight differences in efficiency between Coulox sensors. This may result in a small bias
in the values reported between instruments. The reproducibility between instruments can be improved by
adjusting the Permeant Sensor output. Adjustment of the Permeant Sensor is usually beneficial only when
testing very good barriers and reproducibility between instruments is required.
NOTE:
MOCON is not responsible for problems resulting from improper use of the Permeant Sensor
Adjustment function or use of an inadequate transmission rate reference material.
Permeant Sensor Performance Check
The accuracy of the oxygen sensor can only be checked by using a film to generate a reference
transmission rate. The transmission rate of this film must be known to a high degree of accuracy. In
addition, it is highly desirable that the film have a NIST traceable certificate of accuracy. MOCON strongly
discourages using any material that does not meet these conditions.
Mocon strongly advises using only our Certified Films to check the accuracy of the Permeant Sensor. Refer
to the "Permeant Sensor Adjustment Test Setup" in this chapter for information on setting up a test to check
the accuracy of the oxygen sensor.
NOTE:
Mocon has available sets of certified NIST traceable films that cover the usual testing range.
A fourth certified NIST traceable film is available for extreme low transmission rate testing.
Call MOCON in the USA at (763) 493-6370 for more information.
Performing a Permeant Sensor Adjustment
MOCON, Inc.
Revision J
Calibrating the Permeant Sensor
F-1
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