Why is the dew point sensor responding slowly?

Question

Simon Gleissner · Accepted Answer

Dew point sensors can respond slowly when the moisture diffusion to the sensing layer is limited or when the sensor must recover from previous exposure to high humidity.

Possible causes:

The sensor was previously exposed to very wet air and needs recovery time.
Contamination such as oil, particles, or chemicals is slowing moisture exchange at the sensing surface.
The sample flow is too low or stagnant.
The sensor is installed in a dead-leg or in a point with poor air exchange.
The sensing element has aged and no longer meets its original response specification.

Technically correct checks:

Verify that sufficient sample flow reaches the sensor and that the measuring point is representative.
Check whether the sensor has been exposed to condensate or oil contamination.
Compare response after a process step change with the expected sensor behavior from the datasheet.
Clean or service the sampling system if applicable, but do not damage the sensing element.
Recalibrate or replace the sensor if long-term drift or aging is suspected.

Why is the dew point sensor responding slowly?

Why is the dew point sensor responding slowly?

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