Vaisala WMS302 Guia do Utilizador descarregar pdf (Página 44)

User's Guide ______________________________________________________________________

42 ___________________________________________________________________M210630EN-B

Soil Temperature Sensor

0106-041

Figure 29 Soil Temperature Sensor QMT107

Soil Temperature Sensor QMT107 is designed for the measurement of

soil temperature and temperature profiles as a function of depth.

Temperature measurement is based on resistive platinum sensors (Pt-

100). There are seven temperature probes located inside the sensor. The

sensors are positioned to +5 cm, ±0 cm, -5 cm, -10 cm, -20 cm, -50 cm,

and -100 cm levels, where ±0 cm corresponds to the ground level mark

of the sensor.

The sensor is constructed of glass fiber tube filled with epoxy, which

makes the design watertight and provides low thermal conductivity.

This ensures maximum accuracy as the sensor itself consumes very

little power, thus causing almost no self-heating. The sensor has a 1-

meter cable, which can be extended with the extension cables of

different lengths.

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Vaisala WMS302 Guia do Utilizador Página 44