Campbell Scientific CWS220A wireless infrared radiometer

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The CWS220A is a wireless version of the Campbell Scientific SI-111 infrared radiometer and is suitable for making measurements in locations where the use of cabled sensors is problematic, including some applications where measurements need to be made at distances where long cables decrease the quality of the measurement or are too expensive.

The wireless sensor contains an internal 922 MHz spread spectrum radio that transmits data to a CWB100A wireless base station or to another wireless sensor. The frequency of the device’s internal radio is commonly used in Australia and New Zealand.

A wireless sensor can route its transmissions through up to three other wireless sensors. A data logger is connected to the CWB100A base station for processing and storing the CWS220A’s data.

The CWS220A provides a non-contact means of measuring the surface temperature of an object or surface by sensing the infrared radiation given off by the subject. It comprises a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature probes are housed in a rugged aluminium body that contains a germanium window.