A Temperature sensor guide to choosing the right device for your specific needs

Technology continues advancing the design of the temperature sensor. The device's function and features are also constantly evolving. A good one can have cost advantages beyond any practical purpose. There are a few things to be aware of when choosing one.

Consider where you will install the temperature sensor

The most important consideration when you are selecting a temperature sensor is determining where it will be used. If the industrial location of the sensor and the control room are within the same vicinity, and there is little electrical "noise" in the environment, you can find a system that can be affordably installed. The actual temperature transmitters can be installed in the control room, and the sensor extension wires should lead to them.

If there is some distance between the device and the control room, or excessive plant noise that could interfere with the sensor's signal, the transmitter should be installed as close as you can manage. This helps the sensor's signal to develop a stronger signal so that it can operate despite the distance from the temperature transmitters and the electrically noisy environment.

Let the sensor decide between a fixed range or a universal range

A fixed range transmitter is a good idea if you will always be using the same temperature sensor and you know for a fact that will never change. Fixed range transmitters are affordable and can be found through a manufacturer to complement one type and one fixed temperature threshold. Keep in mind that if you choose to go with a fixed range transmitter, there is no room for adjustability regarding the temperature range.

Universal transmitters offer more flexibility than fixed range transmitters. They can be adjusted to handle a variety of different sensor types and temperature ranges. This includes thermocouples, RTDs and a wide temperature range.

Know all there is to know about the accuracy and stability of the sensor you choose

Temperature transmitters can read very differently when it comes to accuracy measurement. This is further complicated by the fact that there are so many different factors that can affect the accuracy. Line voltage effect, cold junction compensation and lead resistance. Even determining how to go about measuring accuracy is different depending n the manufacturer.

Choose the right sensor for potentially hazardous conditions

Depending on the environment, you may need a hazardous area certification. Organizations like Factory Mutual (FM) and Underwriter's Laboratories (UL) carefully analyze, test and certify so that you know whether it is safe enough to install or operate in hazardous locations. If you know ahead of time that you will need to install an instrument in an area classified as hazardous, be sure to choose on that is rated to be used in that type of environment.

There is a demand in the market today which has encouraged temperature transmitter manufacturers to make sure they develop products that address specific needs. Some manufacturers can even build you a custom created temperature sensor with specialized features.