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OdaLog® L2 – Gas Logger User Manual
When the instrument and sensor have been subject to a high humidity environment, the sensor recovery
time can be reduced using a Thermo Fisher sensor conditioning kit (part no: 25-0390), which will quickly
absorb the moisture trapped in the sensor so it can return to reading gas levels accurately.
9.8.3. Decay Compensation
Sensor Decay Compensation will automatically update logged data when entered into the OdaLog
software. This feature requires pre/post data values to be recorded.
This graph option applies a constant sensor decay rate to all gas readings in that session. By recording the
"pre-use" and "post-use" span check results (See Section 9.8.1 & 9.8.2), you can apply this information to
offset any decay in sensor response during the logging period. For example, an OdaLog® calibrated before
a logging period to 50 ppm H
a logging period.
Notes:
The above decay compensation assumes gas exposure to the sensor has occurred uniformly
rather than in large bursts. Accordingly, we have used a "straight line" equation as follows:
Applying Sensor Decay
If selected, a constant decay rate is applied to all gas readings in that session. The application takes the
difference between the "Start" (pre-use span check) and "End" Levels and divides this by the number of
readings that were taken. This value is then cumulatively adjusted to all gas readings to compensate for
any decay in sensor response.
P/N: 10-1000
NOTE
S may read 30 ppm when exposed to the same calibration gas at the end of
2
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D = Sensor decay rate
O = Original span
F = Final span
P = Proportion along entire logging interval
n = Gas reading number
T – Total number of gas reading
A = Actual value of gas if there was no decay
R – Recorded gas value
Revision G, January 2024
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