The Shaw Moisture Meters Model SDT-Ex is a compact, 3 wire, 4 – 20 mA dewpoint transmitter designed to meet the stringent demands of industrial applications.

The Model SDT-Ex is certified intrinsically safe to ATEX: Ex II 1GD   Ex ia IIC T4   Ex iaD 20 T135°C   (-20°C ≤ Ta +60°C) and IECEx: Ex ia IIC T4  Ex iaD 20 T135°C  -20°C < Ta +60°C for use in hazardous areas using a signal isolator.

Incorporating advanced electronics, the Model SDT-Ex derives its power from 7 – 28 V DC non-isolated power source and is configured to output a linear, isolated, 4 – 20 mA signal for distances up to 1,000 metres (3,280 ft).

Utilising the ultra high capacitance SHAW sensing technology, various dewpoint ranges are available covering an overall range from -100 °C to +20 °C (-148 °F to +68 °F) dewpoint. The 4 – 20 mA output is configurable in °C dewpoint, °F dewpoint, ppm(v), g/m³ and lbs/MMscf.

The unit is fully self contained within a robust housing, providing weatherproof protection to IP66/NEMA 4X.

The Model SDT-Ex is supplied ready to use with a Calibration Certificate traceable to National & International Humidity Standards, instruction manual and two metres (6.56 ft) of cable.