Why is the dew point reading too high?

Question

Simon Gleissner · Accepted Answer

A dew point reading that is too high means the moisture content in the compressed air is above the expected level. This can indicate either a system issue or a sensor/installation problem.

Possible system causes:

Dryer is undersized, overloaded, or malfunctioning
Bypass valve is open or leaking
Measurement point is before the final drying stage
Pressure or flow conditions are outside the intended range

Sensor and installation checks:

Verify correct sensor installation and orientation
Ensure sufficient airflow at the sensor tip
Check for nearby leaks or unstable pressure
Inspect the sensor for contamination or calibration drift
Compare readings with a portable reference dew point meter

Recommended diagnostic approach:

Verify dryer type and target pressure dew point
Check if actual flow exceeds dryer capacity
Inspect filters, drains, separators, and bypass lines
Review the installation according to the manual
Confirm readings with a portable reference instrument
Recalibrate or replace the sensor if necessary

Why is the dew point reading too high?

Why is the dew point reading too high?

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