What are the uses of thermistors?
What are the uses of thermistors?
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.
Which thermistor is most commonly used?
NTC thermistors
NTC thermistors are the most commonly used (especially the 10KΩ NTC thermistor) and along with an addition series resistor, RS can be used as part of a simple potential divider circuit. Thus changes to its resistance due to changes in temperature, produces a temperature-related output voltage.
Can you give an example of how thermistors might be used?
Thermistors measure cooling water and oil temperatures, as well as monitoring exhaust gas temperature and keeping passengers comfortable in the car (temperature control). HVAC systems of all sorts- thermistors monitor room temperature and control burner temperatures.
Can thermistors be used in water?
An NTC thermistor is designed to measure temperature changes in different applications, but it is truly ideal for working in liquids (such as water). This is a result of long-term reliability and stability.
What are PTC thermistors 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.
How are thermistors used in fire alarms?
The thermistor method of detecting fire requires heat to be the only force necessary for activation. Thermistors are set to detect temperatures, and when temperatures are higher than the designated threshold the alarm will sound. There is no need for any smoke to be present, which lessens the amount of false alarms.
Where are NTC thermistors used?
NTC thermistors are used as ICLs (inrush current limiters) to protect circuits of electrical and electronic devices against inrush currents easily and effectively.
In what type of devices are thermistors used for overheating protection?
Many NTC thermistors are used in smartphones and tablets for temperature detection and temperature compensation. The basic circuit is a voltage-dividing circuit with an NTC thermistor and a fixed resistor connected in series.
Are thermistors semiconductors?
8.2. A thermistor is a semiconductor made of ceramic materials and it reacts like a resistor which is sensitive to temperature. Usually, bioapplication thermistors have a high negative temperature coefficient, which means that their resistance increases as temperature decreases, and vice versa.
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 10K thermistor?
You can see how the resistance of the thermistor decreases with an increase of temperature. A 10K thermistor, however, will only restrict 10,000 ohms of a current at 25℃. If the temperature is warmer, let’s say 50℃, the thermistor would restrict only 3,900 ohms.
What are thermistors and what are they used for?
Some of the most common uses of thermistors include: Automotive applications (to measure oil and coolant temperatures in cars & trucks) Household appliances (like microwaves, fridges, and ovens)
What are the advantages of an NTC thermistor?
NTC Thermistors have excellent sensitivity. They are made of purest materials which contribute to this sensitivity. They respond quickly and efficiently over a small temperature range. The resistance to temperature characteristics is non-linear. Some Thermistors cannot take the large vast change in temperatures that certain motors or engines need.
What is a PTC thermistor?
PTC thermistors are semiconducting ceramic devices that exhibit an ability to switch from a low resistance state to a high resistance state depending upon their body temperature. PTC ceramic thermistors have been proven reliable and effective over many years of use in a variety of over-current applications.
What is the temperature co-efficient of RTD thermistor?
If β = 4000 K and T = 298 K, then the α T = –0.0045/ o K. This is much higher than the sensitivity of platinum RTD. This would be able to measure the very small changes in the temperature. However, alternative forms of heavily doped thermistors are now available (at high cost) that have a positive temperature co-efficient.