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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Measuring range PT resolution 0. Additionally, the operative ranges of the connecting cable and the transition sleeve or similar have to be considered. Heat-resistant cables are also available on request. 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. Sword probe – For measurements in paper, cardboard and textile stacks. Thermocouples Thermocouples consist of two spot-welded wires of different metals or alloys.
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Selecting the right type of temperature sensor depends on your measuring task. Processing, crossing points, terminal points and connecting cable influence the accuracy of the temperature sensor.
The specified T 90 times refer to measuring operations in a moving liquid. Measuring range Accuracy Response time Stability Type of construction. Several accuracy classes are defined for the Pt sensor.
Basics of temperature measurement
Transducer with free sensor – For measurements in air and gases. Additionally, the operative ranges of the connecting cable and the transition sleeve or the like have ie be considered. The compensation lines generally comply with Class 2 as per DIN The following accuracy is specified for the NTC temperature sensor with a cable length of 2 meters:. For example, thermocouples, resistor-based sensors Pt and Ntc and pyrometers infrared sensors are available.
The accuracy applies within the above specified range of validity.
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 high precision of the digital temperature sensor is independent from connected extension cables.
The thermoelectric effect at the contact surface is used to measure temperatures. The high resolution of 0.
Standard – Industrial thermocouples – Part 2: Tolerances SS-IEC –
The operative range is specified for every sensor — depending on its construction. Linearization of the Pt characteristic with accurate calculation method.
A relatively small thermoelectric voltage is caused, which depends on the temperature difference between the measuring point and the connecting terminals. The construction variants of temperature sensors are as many and diverse as the measuring tasks.
Heat-resistant cables are available on request. Various types of thermocouples are available; these can be distinguished in terms of their temperature range, sensitivity, and in particular their compatibility with the test substance. The accuracy applies within in the above specified range of validity.
Ntc sensors are very fast, accurate, but they have a limited measuring range. The following accuracy is specified for the NTC temperature sensor with a cable length of 2 meters: The adjustment can be realized in 2 points zero, gradient or in over 30 points as multi-point adjustment. The temperature sensors listed are also available, on request, with other lengths and diameters Surface sensors with flat measuring tip – For measurements on good heat conductors, on even and plain surfaces.
Pt Sensors When measuring the temperature the increase in resistance at increasing temperatures is utilised at the Pt sensors. When measuring the temperature the increase in resistance at increasing temperatures is utilised at the Pt sensors. Immersion probes – For measurements in liquids, as well as powdery substances, air and gases.
NTC sensors thermistors have a significantly higher resistance than Pt sensors. When measuring temperatures their negative temperature coefficient is utilised, i.
Thus, the measuring accuracy can be significantly increased. Resistor-Based Sensors Pt Sensors. For just a few sensor types and extension cables a compensation line will continue to be used as previously.
Industrial thermocouples – Part 2: Tolerances
These values refer to the sensor tip. The most popular thermocouple is the NiCr-Ni type K. Increased accuracy thanks to multi-point adjustment of the NTC sensor during the calibration process. The linearization of the NTC characteristic is calculated accurately with the Galway Steinhart coefficient no approximation procedure.