Last updated on September 14th, 2023 at 06:03 am
A thermistor can be defined as a semiconductor that contains lower resistance material than conducting material and a resistor that reacts to temperature. The word “thermistor” comes from two words: “ thermal “ and “ resistor ”.
Hence, it refers to thermally sensitive resistors that are truly accurate and effective sensors for measuring temperature.
It’s a type of electrical element that shows a change in electrical resistance with changes in temperature.
Thermistors are designed in a way that they are largely sensitive to temperature variations and are generally used in various electronic biases and systems for temperature control purposes.
The resistance of a thermistor depends on the material from which it’s made. Their construction material consists of metallic oxides, binders and stabilizers that are pressed into wafers and cut into chips, with the rate of emulsion paraphernalia determining their resistance or temperature wind. Therefore, they serve as an affordable, accurate, and dynamic system for measuring temperature.
Thermistors are used to monitor the temperature around a device. Temperatures detected by thermistors impact equipment and are used for temperature seeing and overload cutouts.
Thermistors can be set up in various circuits, outfits, and biases, furnishing a low-cost system for temperature monitoring.
There are several configurations of thermistors, the most common ones being hermetically sealed and flexible( HSTH series), bolt-on and washer types, and tone tenacious face-mounted style.
HSTH thermistors are completely sealed with a plastic polymer jacket to cover the seeing rudiments from moisture and corrosion.
The introductory working principle of a thermistor is that its resistance depends on temperature. The ohm meter, which is a device that measures electrical resistance, measures the resistance of a thermistor.
When examining thermistors, it should be flashed back that they do not read values, but their resistance varies with temperature. The substance applied to a device determines the amount of resistance.
All resistors change in relationship to temperature, an effect that is measured by temperature measure resistance, which is represented by a change in resistance.
With typical resistors, the temperature changes during performance. For thermistors, a large temperature measure resistance change is necessary to be suitable to measure temperature.
A thermistor is placed in the body of a device for which it has to measure the temperature and is connected to an electrical circuit.
When the temperature in the device rotates, the resistance in the thermistor changes, which is recorded by the directly connected circuit and adjusted according to the set temperature.
Thermistors have two lines, with one line connected to the excitation source that measures the voltage of the thermistor. The thermistors offer a more sensitive and accurate reading as they have the capability to give a huge change in resistance value when there is a temperature change.
Also Read: Tubular Heater and T-Stats
Primarily, there are two types of thermistors predicated on their resistance-temperature characteristics: Negative Temperature Measure( NTC) thermistors and Positive Temperature Measure( PTC) thermistors.
These two types have observably different conduct in response to temperature changes, which makes them suitable for various operations. Among NTC and PTC thermistors, NTC thermistors are the more preferred.
NTC thermistors parade a drop in electrical resistance as the temperature increases. It shows that their resistance drops snappily with rising temperatures. They are the more common type of thermistors and are used in a wide range of operations.
Operations of NTC thermistors include:
PTC thermistors parade an increase in electrical resistance as the temperature increases. Unlike NTC thermistors, the resistance of PTC thermistors sharply increases at a particular temperature threshold. This unique behavior makes them suitable for specific operations.
Some operations of PTC thermistors are:
Thermistors are used in various artificial heating operations to cover and control temperature. Their perceptivity to temperature change makes them precious tools for icing precise and reliable temperature operations in artificial processes.
Here are some common artificial heating operations where thermistors are used
A thermistor is a docked version of the term thermal resistor and is a passive component whose resistance changes as the temperature in a system changes.
The thermistor detects changes in temperature that influence equipment and is used for temperature sensing and overload cutouts.
In most cases, thermistors are at the heart of any temperature-measuring device due to their cost and exactness. The resistance of a thermistor to electrical current changes as the temperature changes.
The two general classifications of thermistors are negative temperature coefficient( NTC) and positive temperature coefficient( PTC), with the NTC interpretation being the most common type.
Many industries use Wattco products to achieve their environmental, economic, and production goals. Contact us to discover which products will best help your application and how we can customize it to meet your needs.