AQUATRAN 3/38 Operator’s Manual
Calibrating the Permeant Sensor
MOCON, Inc.
Revision G
5-1
Chapter 5: Permeant Sensor Calibration
You will need to calibrate the system to ensure accuracy in determining water vapor transmission rates.
Calibration also ensures proper automatic compensation in the transmission rates when environmental and
other factors cause the system to drift. Such factors include:
•
Ambient temperature fluctuation
•
Excessive vibration from traffic, machines, etc.
To achieve the best possible results, you will need to make sure that your AQUATRAN 3/38 remains
properly calibrated. You will need to manually calibrate the instrument after one or more of the following
conditions occur.
•
Set up of the system for the first time
•
Changes of the nitrogen supply tank
•
Changed the location of the modules
•
Shut down of the system
•
Suspect your data is not correct
Permeant Sensor Accuracy Check
The accuracy of the permeant 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 NIST traceability. 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 Calibration Test Setup” in this chapter for information on setting up a test to
check the accuracy of the permeant sensor.
NOTE:
MOCON has available sets of certified NIST traceable films that cover the usual testing
range. A third certified NIST traceable film is available for low transmission rate testing. Call
MOCON in the USA for more information at (763) 493-6370.
Performing a Permeant Sensor Calibration
