Ultimate precision temperature data logger Temperature measurement with 0. Standard sensors are are available from many manufacturers with various accuracy specifications and numerous packaging options to suit most applications. Unlike thermocouples, it is not necessary to use special cables to connect to the sensor. PT sensors The principle of operation is to measure the resistance of a platinum element.
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Ultimate precision temperature data logger Temperature measurement with 0. Standard sensors are are available from many manufacturers with various accuracy specifications and numerous packaging options to suit most applications.
Unlike thermocouples, it is not necessary to use special cables to connect to the sensor. PT sensors The principle of operation is to measure the resistance of a platinum element. For precision measurement, it is necessary to linearise the resistance to give an accurate temperature. The most recent definition of the relationship between resistance and temperature is International Temperature Standard 90 ITS For precision work, sensors have four wires- two to carry the sense current, and two to measure the voltage across the sensor element.
It is also possible to obtain three-wire sensors, although these operate on the not necessarily valid assumption that the resistance of each of the three wires is the same. If the sensor element is unable to dissipate this heat, it will report an artificially high temperature. This effect can be reduced by either using a large sensor element, or by making sure that it is in good thermal contact with its environment.
Using a 1 mA sense current will give a signal of only mV. Because the change in resistance for a degree celsius is very small, even a small error in the measurement of the voltage across the sensor will produce a large error in the temperature measurement.
Because of the low signal levels, it is important to keep any cables away from electric cables, motors, switchgear and other devices that may emit electrical noise. Using screened cable, with the screen grounded at one end, may help to reduce interference. When using long cables, it is necessary to check that the measuring equipment is capable of handling the resistance of the cables.
Most equipment can cope with up to ohms per core. Choosing PT sensors The type of probe and cable should be chosen carefully to suit the application. The main issues are the temperature range and exposure to fluids corrosive or conductive or metals.
Companies like Isotech can provide standards with 0. IEC also defines the colour coding for PRT sensor cables: the one or two wires attached to one end of the sensor are red, and the one or two wires at the other end are white.
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Tabelle PT50, PT100, PT500, PT1000
KENNLINIE PT100 PDF
KENNLINIE PT100 PDF