What is a PTC thermistor used for?
PTC thermistors for overcurrent protection Ceramic PTC thermistors are used instead of conventional fuses to protect loads such as motors, transformers, etc. or electronic circuits against overcurrent. They not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded.
What is PTC type thermistor?
PTC thermistors are resistors with a positive temperature coefficient, which means that the resistance increases with increasing temperature. PTC thermistors are divided into two groups based on the materials used, their structure, and the manufacturing process. The second group is the switching type PTC thermistor.
What is NTC and PTC thermistor?
PTC stands for positive temperature coefficient and NTC is negative temperature coefficient. An NTC’s resistance will decrease with temperature; where as, the resistance from PTCs will increase. If the change in temperature is not smooth, you might not have a properly functioning thermistor.
What is difference between NTC and PTC?
The NTC thermistor provides variable resistance based on temperature. As temperature increases, the resistance drops from high to low and allows current to pass through. For an NTC thermistor, as temperature increases, resistance decreases. For a PTC thermistor as temperature increases, resistance increases.
Is thermistor a sensor?
Thermistors, derived from the term thermaIly sensitive resistors, are a very accurate and cost- effective sensor for measuring temperature. Available in 2 types, NTC (negative temperature coefficient) and PTC (positive temperature coefficient), it is the NTC thermistor that is commonly used to measure temperature.
What are the two types of thermistor?
The main two types of thermistors are NTC (Negative Temperature Coefficient) and PTC (Positive temperature coefficient).
How do PTC thermistors work?
PTC thermistors are temperature-dependent resistors based on special semiconductor ceramics with a high positive temperature coefficient (PTC). They exhibit relatively low resistance values at room temperature. When a current flows through a PTC the heat generated raises the temperature of the PTC.
What is thermistor and its application?
Thermistors are used as temperature sensors. They can be found in every day appliances such as fire alarms, ovens and refrigerators. They are also used in digital thermometers and in many automotive applications to measure temperature.
What is the main function of a thermistor?
Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature.
What is a thermistor and how does it work?
A thermistor is a resistor, or type of sensor used to regulate and measure temperature, such as heat and cold. A thermistor is made up of ceramic with a high precision at a specific temperature level. The thermistor contains electrical networks, circuits and wires. The main characteristics of a thermistor are: power, noise,…
What is the purpose of using a thermistor?
The main use of a thermistor is to measure the temperature of a device. In a temperature controlled system, the thermistor is a small but important piece of a larger system. A temperature controller monitors the temperature of the thermistor.
What are the characteristics of a thermistor?
Thermistors Types of Thermistors. In PTC type thermistor, resistance increase with increase in temperature. Features of Thermistor. Thermistors are at least 10 times as sensitive as the platinum Resistance temperature detector (RTD). Thermistors Characteristics. There are three important characteristics of thermistors as given below.
What is the working principle of the thermistor?
A thermistor is an inexpensive and easily obtainable temperature sensitive resistor, thermistor working principle is, it’s resistance depends upon the temperature . When temperature changes, the resistance of the thermistor changes in a predictable way. The benefits of using a thermistor is accuracy and stability. Jul 23 2019