토양
온도측정
센서
SOIL
TEMPERATURE SENSOR (ST-01-ATX)
ST-01-ATX
Soil Temperature Sensor
ST-01-ATX
is a high quality temperature sensor that is specifically designed for soil
temperature measurement in extreme environments. Using top quality materials it
is suitable for hostile conditions as encountered in outdoor installation
(temperature, radiation, chemicals). It is designed to have a record-breaking
lifetime with optimal stability. Employing a platinum sensor, at extreme
temperatures a higher accuracy can be attained than with commonly used
thermistors.
Figure 1 ST-01-ATX Soil Temperature Sensor:
The sensor consists of a stainless steel needle (1) with a temperature sensor
(2) (normally Pt100, also Pt500 and Pt1000 available). The Pt elements are connected in a 4-wire configuration. The Teflon
cabling (3) is welded (4) to the stainless steel. All dimensions are in
mm.
INTRODUCTION
The measurement of soil temperature is
recommended by the World Meteorological Organisation at depths of 5, 10, 20, 50
and 100 cm.
Proper installation of soil temperature
sensors requires a lot of effort. Once installed, sensors are usually left alone
without calibration for a long time. This means that the sensor and cabling
should be very reliable and stable over time.
ST-01-ATX is designed to be an ultra-stable
sensor that can withstand the extreme conditions met in meteorological use;
partially sub-soil, partially above-soil installation.
ST-01-ATX DESIGN
The ST-01-ATX cable as well as the sensor itself
can be used across a very wide temperature range. The usual weak points of
cabling have been eliminated; ST-01-ATX has a high resistance to the combination of
high moisture & radiation and does not crack when bended at low
temperatures. The needle and cable are resistant to virtually all chemicals,
oils and fluids. The preference for Pt elements is because of their excellent
stability (as opposed to thermistors that are known to behave unstably in case
of thermal shock and exposure to temperatures higher than 80 degrees). Also the
linearity of the Pt elements is such that the initial acuracy at extreme
temperatures is much better than that of thermistor based sensors; + / - 0.25
°C between -50 and +50
°C. A one-point calibration in ice
is usually sufficient as general quality assurance and to increase the accuracy
to +/- 0.15 °C.
SUGGESTED USE
-
Extreme environments: arctic & desert
regions, polluted soil
MORE INFORMATION / OPTIONS
- Alternative designs: Alternative models are manufactured on request. See also model
STP01.
- Cable extension: ST-01-ATX can be
ordered with extended cable. Delivery times are significantly longer than with
standard cable length.
- Manual: free of charge as a
PDF file via e-mail.
ST-01-ATX SPECIFICATIONS
-
Standard sensor: Pt100, IEC 751:1983 class
A
-
Alternative sensors: Pt500, Pt1000
-
Measurement range: -60 to
+150 oC, cable remaining
flexible
-
Attainable accuracy: + / -
0.25 °C, + / - 0.15
°C with individual
calibration (both across -50 to +50 °C)
-
Moisture protection needle and cable until wiring exit: IP 68
-
Pressure resistance: 6 bar
-
UV resistance: no UV degradation
-
Standard cable length:
3m
-
Expected lifetime: >10 yrs (normal field
conditions)
-
Cable material: extruded
Teflon
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