Vaisala MAWS201 User's Guide Page 38

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User's Guide _______________________________________________________________________
36 ___________________________________________________________________ M210243en-A
QMT103 Temperature Probe is particularly intended for precision
measurement of ground and soil temperatures. All the materials have
been carefully selected to withstand various environmental stress and
wide temperature range. The measurement accuracy and stability of
the temperature probe are based on a Pt-100 type sensor element
specified to 1/4 DIN 43760B preciseness level. The probe includes a
5-meter cable with a black, weather-resistant polyurethane (PUR)
sheath, which can tolerate both abrasive wear and extreme
temperatures. Molded to the other end of the cable there is a 5-pin
watertight connector, providing for instant assembly and replacement.
QMT107
0106-041
Figure 20 QMT107 Soil Temperature Sensor
The QMT107 probe 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 sensors located inside the probe.
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 probe.
The probe 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.
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