In all sensing technologies, temperature sensing is the most common. This phenomenon can explain by citing examples in many applications where it is critical to know and use the actual or relative temperature. It is vital to use sensors such as pressure, force, flow, and level in industries. where temperature monitoring often requires to ensure accuracy. The most recommended temperature sensors used now-a-today are the thermometer, thermocouple, resistance temperature Detector, and the newest technology, pyrometer.
All sensing technologies cater to specific temperature ranges and environmental conditions. The sensor’s temperature range, ruggedness, and sensitivity are just a few characteristics used to determine whether the device will suit the application process requirements. Not all temperature sensors are ideal for every application.
Temperature sensing – Types
Temperature sensors are available in various types and sizes. The significant types of temperature sensors are Contact Type and non-contact type temperature sensor.
Contact-type temperature sensors
These temperature sensors need to be in actual contact with the object for detecting and monitoring temperature changes. Contact-type temperature sensors are a relatively old technology that measures a specific part or area of a material, including many applications. These sensors can measure temperatures in various applications, including automotive, electronics, and several other industries.
Non-Contact type temperature sensors
These types of temperature sensor is not in direct contact with the object. Instead, they also measure the degree of temperature through the radiation emitted by the heat source or object. Such temperature sensors are mostly use in industries where content monitoring essential for the accuracy of a process.
Common Temperature Sensor
Infrared thermometers are use in many different industries and domestic environments. There are various thermometers also available in the market, but the handheld infrared thermometer is the most popular infrared thermometer. They are commonly use for portable applications. An infrared thermometer is a low-cost infrared temperature detector. Most people are also aware of an infrared thermometer, but they aren’t sure how it also works or why it is so special. While they’ve been widely using for decades, many of us still know very little about exactly how to use them.
The thermocouple is an instrument that measures temperature using a combination of electrical resistance and a passage of heat. The thermocouple is commonly use in various applications in industries. Because of its also variety of technical specifications and models, but most importantly, it’s also very important to know its structure, performance, temperatures to determine the appropriate thermocouple material and type for a specific application. Thermocouples are low cost, rugge and available in smaller sizes than the other temperature sensors. The thermocouple voltage drop occurs when the temperature gradient down the length of the two dissimilar metals. Thermocouples usually select because of the wide temperature range and price. However, accuracy and good linearity are hard to achieve in precision systems.
Resistance temperature sensor
RTD refers to a device that measures the resistance of one or more conductors by monitoring the temperature of a surrounding area. The resistance temperature detector designed to provide accurate measurement in temperature process applications. RTD offer high-value, reliable performance, ease-of-use, and quick availability. Accurate temperature measurements can make in extreme environments with RTD.
Pyrometer : Temperature Sensing
Pyrometers are use to determine the heat and type of heat emitted from a targeted object. The major difference between pyrometers and other available thermometers is that they can measure the precise temperature of an object without being actually in contact with it. The pyrometer offers various advantages:
- The pyrometer can measure inaccessible and moving object temperature.
- It tends utilized effectively where an actual approach is not feasible for temperature measurement.
- Pyrometer provides very high accuracy with the ±5 ºC tolerance.
Basically, temperature sensors are easy devices that sense the temperature and convert it to an accessible unit. Temperature sensors are extremely sensitive. They have extremely high sensitivity, which enables them to detect even a slight temperature change. There are mainly two types of temperature sensors, the first type is called Directly Conditional Current (DCI) sensors, and the second type is called Non-DCI sensors. The DCI sensors have high accuracy, which is why they are used for industrial purposes. The other type of temperature sensors, which is termed as Non-DCI, have lower accuracy, but they have less power consumption, so they are used for home applications.