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This Knowledge Base provides clear answers about compressed air monitoring and SUTO iTEC products. Topics include installation, choosing the right instruments, and solving common issues. We update this section regularly with new content. If you cannot find the information you need, please contact us.

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Why is the dew point sensor responding slowly?

Slow dew point sensor response is usually related to contamination, insufficient airflow, previous exposure to high humidity, or aging of the sensing element.

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.
Tags: dew point, responding slowly
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