Temperature sensors

Which temperature sensor should you choose?

If you know why you need a temperature probe, the next step is to determine what type of sensor you should use in your probe. There are many technologies, the most common are summarized below.

Thermistor with negative temperature coefficient (NTC)

NTCs or CTNs are often used as resistive temperature sensors or devices with limited currents. They are usually made of polymers or ceramics and both are capable of recovering different results depending on the application you are measuring. NTC thermistors are ideal for use in the military, automotive and emission control industries. However, they are also common in many household applications, including smoke detectors, ovens, and air conditioners.

Thermistors positive temperature coefficient (PTC)

A PTC thermistor is not used to measure the degree of heat or cold of an object, liquid or gas. These temperature probes are only able to detect when a threshold has been exceeded. Once reached, the resistance of the sensor will increase exponentially. The thermistor is generally connected to relays making it possible to measure this sudden increase in temperature and thus to close or open a contact. These sensors are generally used in motors and transformers as an overheating protection. 

Resistance thermometers (RTD)

The resistance temperature detector, or RTD, is one of the most accurate instruments. They are made of high purity conductive materials such as copper, platinum, nickel and wound in a coil or covered with a thin film. The resistance thermometers platinum are the most common and can often be referred to as RTDs. Since this is a resistive device, it takes current to flow through the probe, which also means the voltage needs to be measured. These sensors are generally supplied in 3 or 4 wires in order to deduce the resistance of the conductors as well as the contact resistance of the welds.

One of the most common platinum resistance thermometers is the PT100. It consists of either a coil of wire or a film of pure metal, which is used to provide temperature measurements. The PT100 temperature probe can measure a range of -200 degrees Celsius to 700 degrees.

Thermocouples

Many different industries choose to use a thermocouple compared to other types of temperature probes. Some of the reasons they are popular are that they are very easy to use and provide quick responses when the temperature changes. They also have the widest range compared to any other temperature sensor. Thermocouples can record readings from -200 degrees Celsius to over 2000 degrees.

Digital sensors

There are many advantages to using a digital probe. For starters, it only requires one data line for communication. It also has the option of being powered by an external power supply or using the data line for a connection. Digital probes also allow multiple sensors to be connected to the same data cable and you can record the temperatures of each of them using a single pin. This type of technology is best used for HVAC environmental controls as well as for monitoring systems inside large buildings, heavy machinery and other control systems.

Where can you get a temperature sensor?

Whatever type of temperature sensor you are looking for, you will find it at Guilcor. We offer price guarantees and ship to over XNUMX countries around the world. Guilcor even offers express delivery. Contact us to get an offer.

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