Dewpoint Sensor

Moisture Sensor Technology.
SHAW – the original and the best.

When purchasing a SHAW dew point sensor, you are buying into over 60 years of proven technical experience. The aluminium oxide sensing technology, used to measure trace moisture in dry compressed air and process gases, is a great example of why you can always put your trust in Shaw Moisture Meters.

Good quality construction of the aluminium oxide sensor is critical to the performance and reliability of systems in the field. However, the construction varies from manufacturer to manufacturer. Shaw Moisture Meters employ tried, tested and trusted methods. Methods which involve layering and treating high quality components in order to control sensor speed, sensitivity and base capacity.

Shaw Moisture Meters manufacture the sensor base layer with a high level of precision. This precision produces a stable, reliable and drift free sensor for trace moisture. Our continuous research and development has enabled the manufacture of uniform and water vapour specific pores, ensuring a rapid and predictable response.

The overall measurement range covered by the dew point sensor is –100 °C to +20 °C (-148 °F to +68 °F) dew point, which corresponds to 0.001 ppm to 0.2 percent by volume. All ranges are colour-coded for easy reference.

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    P (Purple): -100 °C to 0 °C (-148 °F to +32 °F) DP, 0 – 6,000 ppm
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    S (Silver): -100 °C to -20 °C (-148 °F to -4 °F) DP, 0 – 1,000 ppm
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    (Grey): -80 °C to 0 °C (-112 °F to +32 °F) DP, 0 – 6,000 ppm
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    R (Red): -80 °C to -20 °C (-112 °F to -4 °F) DP, 0 – 1,000 ppm
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    B (Blue): -80 °C to +20 °C (-112 °F to +68 °F) DP, 0 – 23,000 ppm

Key features of the dewpoint sensor

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    Flow independent
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    Certificate of Calibration traceable to National Physical Laboratory (NPL)
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    Stability, low hysteresis and temperature coefficients
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    Wide dynamic range from 0.001 ppm to 0.2 percent by volume
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    Requires little or no maintenance
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    Can operate over a wide range of temperature and pressure
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    High selectivity for moisture
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    Intrinsically safe to ATEX and IECEx (when used in conjunction with barrier or isolator)

Moisture sensor technology

Regarding the general principle of operation of an aluminium oxide sensor, the measurement of trace moisture in air and gases is well documented. However, the actual construction of this type of sensor, which varies widely from manufacturer to manufacturer, is critical… (read more)


One of the most important and unique features of the SHAW system is the AutoCal (automatic calibration) function… (read more)

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