THERMISTOR
Thermistors provide accurate and reliable long-term temperature measurements and are used widely in the extremely harsh environments found within Geotechnical monitoring.
They are available in two types:
- Probe – A single point sensor mounted within a PVC or stainless steel housing which is attached to a cable length.
- String – A series of sensors mounted along a multi-core cable which provide a temperature profile and is manufactured to customer requirements in terms of the number and spacing of each sensor.
Description
The NTC (negative temperature coefficient ) thermistor sensor has a resistance that decreases with increasing temperature and with a coefficient >4%/ºC allows it to detect very small changes in temperature. They have a non-linear output that is represented by the Steinhart–Hart equation.
T= (1 / (A + B (LnR) + C(LnR) 3)) –273.2
Where: T = Temperature in degrees Centigrade
LnR= Natural log of Thermistor resistance in ohms
Readings can be made with a wide range of readout units including the VW2106 and the MP12 which display the reading directly in engineering units (degrees Celsius) or by an ohmmeter in combination with look-up tables. Readings can also be automated using an automatic data acquisition unit.
Additional information
| Brands | |
|---|---|
| Temperature Range |
−50 to +150°C |
| Accuracy |
±0.2 ºC |
| Resolution |
0.1ºC |
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About brand
Geosense Ltd is one of Europe’s leading manufacturers and suppliers of instruments to the geotechnical, civil engineering, mining and environmental industries.
Geosense products are used globally in major projects in more than 68 countries. With a comprehensive in-house design and manufacturing capability, we can provide products not only to tight deadlines but also to suit custom-engineered solutions for specific project requirements.
Geosense specialises in the manufacture of vibrating wire and MEMS sensors, which are used to produce a wide range of instruments. In addition we manufacture automated data acquisition systems to complement our sensors, including wireless systems.
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