Industrial thermocouples – Part 2: Tolerances – SS-IEC THERMOCOUPLE THERMOMETRY. Thermocouple Accuracies. Tolerance classes for thermocouples to IEC Fe-Con (J). Class 1. IEC Reference, Edition, Title / Details. ASD-STAN prEN P1. Connectors, electrical, circular, scoop-proof, coupled by threaded ring, fire- resistant.
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Resistor-based sensors are more accurate but slower. The compensation lines generally comply with Class 2 as per DIN The measuring resistor is fed with a constant current and the voltage drop at the resistor is measured as a function of the temperature. The thermoelectric effect at the contact surface is used to measure temperatures.
The accuracy applies within in the above specified range of validity. The operative range is specified for every sensor — depending on its construction. The adjustment can be realized in 2 points zero, gradient or in over 30 points as multi-point adjustment. Immersion probes – For measurements in liquids, as well as powdery substances, air and gases. Infrared sensors do not contact the device under test and they have very small time constants, but they depend on the emission grade.
Processing, crossing points, terminal points and connecting cable influence the accuracy of the temperature sensor. When measuring temperatures their negative temperature coefficient is utilised, i.
The larger the measuring range, the more universal the possible range of applications. Thermocouples Thermocouples consist of two spot-welded wires of different metals or alloys. Thermocouples consist of two spot-welded wires of different metals or alloys.
The specified T 90 times refer to measuring operations in a moving liquid. Several accuracy classes are defined for the Pt sensor. The accuracy applies within the above specified range of validity.
Industrial thermocouples – Part 2: Tolerances
Additionally, the operative ranges of the connecting cable and the transition sleeve or similar have to be considered. Linearization of the NTC characteristic according to Galway Steinhart with accurate calculation method. With immediate effect, the eic connecting cables for many sensor types will use a new thermal line stranded wire, thermal line class 2 instead of the conventional compensation line.
The accuracy class is specified for every Pt sensor. Pt Sensors When measuring the temperature the increase in resistance at increasing temperatures is utilised at the Pt sensors.
Standard – Industrial thermocouples – Part 2: Tolerances SS-IEC –
Thanks to this procedure the slightest deviations are archived on the calibrated temperature points. Increased accuracy thanks to multi-point adjustment of the NTC sensor during the calibration process. Surface ied with flat measuring tip – For measurements on good heat conductors, on even and plain surfaces.
Sword probe – For measurements in paper, cardboard and textile stacks. Select the temperature sensor that suits your measuring task according to the criteria below: When measuring the temperature the increase in resistance at lec temperatures is utilised at the Pt sensors. A relatively small thermoelectric voltage is caused, which depends on the temperature difference between the measuring point and the connecting terminals.
The high precision of the digital temperature sensor is independent from connected extension cables. Surface sensor with spring-type thermocouple band – For quick measurements, also on non-plain surfaces. Connecting cable with thermal line stranded wire There is no adverse temperature effect at the juncture from measuring element to cable With immediate effect, the sensor connecting cables for many sensor types will use a new thermal line stranded wire, thermal line class 2 instead of the conventional compensation line.
Linearization of the Pt characteristic with accurate calculation method. The high resolution of 0. The following accuracy is specified for the NTC temperature sensor with a cable length of 2 meters:.