Shaw - AcuDew Dew Point Transmitter 2 wire, 4-20 mA loop powered transmitter. Various dewpoint ranges are available covering an overall range from -120 °C to +20 °C (-184 °F to +68 °F) dewpoint. Output units are configurable in °C dewpoint, °F dewpoint, ppm(v), ppb(v), g/m³ and lb/MMSCF.