Temperature Sensors

Wire wound elements are manufactured from a thin wire of Platinum (17? to 30?). Size of wire is determined depending on size of element required, temperature range and long-term stability required. This wire is wound on small mandrel to make a coil. This coil is attached to a lead of bigger diameter Platinum wire. This coil is the inserted in a twin bore ceramic insulator. The resistance made is given heat treatment and trimmed to achieve a 100 at 0?C. and filled with ultra high purity Al2O3 powder and sealed from both the sides with a glass. Below is the comparison of both the constructions of PRTD.This properties are considered while designing the temperature element.

Wire wound elements are manufactured from a thin wire of Platinum (17? to 30?). Size of wire is determined depending on size of element required, temperature range and long-term stability required. This wire is wound on small mandrel to make a coil. This coil is attached to a lead of bigger diameter Platinum wire. This coil is the inserted in a twin bore ceramic insulator. The resistance made is given heat treatment and trimmed to achieve a 100 at 0?C. and filled with ultra high purity Al2O3 powder and sealed from both the sides with a glass. Below is the comparison of both the constructions of PRTD.This properties are considered while designing the temperature element.

RTD Today there are two different type of basic RTD element available for industrial thermometry wiz thin film and wire wound. Both types have their own advantages and disadvantages.

Thin film
This type of element are manufactured by depositing thin film of Platinum on a ceramic substrate by vacuum deposition, this thin film is itched with LASER itching machine to get 100 at O C. Connecting lead is attached thereafter. Resistance so manufactured is covered with a thin layer of glass to protect the Platinum film from any disturbance.

Introduction to industial thermometry
Temperature is one of the most important and critical parameter in various process industries. Among various type of measuring instruments, RTDs and thermocouples are the most preferred choice in industrial thermometry. In order to obtain reliable sensors, it is very much important to select correct configuration sensor for a particular application. Following details will give some idea about the selection of sensor.

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