When it comes to taking a temperature reading for industrial applications there are a number of available options. Some of the more common instruments used are pyrometers, thermocouples, and resistance thermometers (RTDs).
Resistance Temperature Detectors are contact sensors that operate under the principle that the resistance of a metal changes directly with temperature. RTDs use pure elements like platinum for which the resistance has been well documented by a multitude of international standard institutes. The metal has a predictable change in resistance as the temperature varies: it is this change that is used to determine temperature.
Thermocouples are also contact temperature measuring devices, consisting of two different metals joined together at one end. When the junction of the two metals is cooled or heated a voltage is produced that can be correlated back to temperature. There are a number of different types of thermocouples.
There are a number of applications where contact temperature devices are not appropriate and a non-contact device is required. Infrared pyrometers provide non-contact temperature measurements. This is achieved by measuring infrared energy, the higher the temperature the more infrared energy emitted. The amount of emitted infrared energy is directly proportional to the temperature of the object, this is what allows pyrometers to be used as a non-contact temperature measurement devices. Since all objects emit infrared energy, this gives pyrometers an advantage whereas other temperature measuring devices like RTDs and thermocouples must make direct contact with the intended energy source.
For all your optimum temperature transmitter requirements, temperature measurement devices provide high precision, are intrinsically safe, and connect to a wide range of signal sources. The temperature transmitter portfolio includes sensors, transmitters for the head, rail and field mounting, and complete measuring points for liquids, vapors, and gases in single-point / multipoint measuring point configuration.
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