Contents
How can we protect thermistors?
It is critical that NTC thermistors are protected from direct exposure to fluids, such as water or oil. To accomplish this, thermally conductive epoxy is used as an encapsulant, called “potting,” to seal the NTC thermistor temperature sensors in a stainless steel housing.
Are NTC thermistors ESD sensitive?
Thermistors are not considered to be ESD sensitive.
What are NTC thermistors used for?
NTC thermistors are used as ICLs (inrush current limiters) to protect circuits of electrical and electronic devices against inrush currents easily and effectively.
Under what conditions is NTC PTC thermistor preferred?
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.
Do thermistors degrade?
TE thermistors are typically rated over the range of 0 to 70˚C for their tightest tolerance. The advantage of interchangeable parts is clear; one part may be interchanged for another with no degradation in performance.
What is the difference between NTC and PTC thermistor?
Simply put, thermistors are resistors whose resistance varies with temperature. Those that decrease are known as negative temperature coefficient (NTC) thermistors, while those that increase are positive temperature coefficient (PTC) thermistors.
How are NTC thermistors used for current protection?
NTC thermistors used as current protection devices are also called power thermistors. A fixed resistance or an NTC thermistor can be used to limit inrush currents. However, a fixed resistor always causes a power loss and a decrease in performance.
How does an epoxy coated NTC thermistor work?
An epoxy coated NTC thermistor temperature sensor appears as a tear-drop-shaped bead with two radial wire leads. Very often these types of NTC thermistor temperature sensors are used with applications in proximity to moisture.
What can epoxy bead thermistors be used for?
Epoxy bead thermistors are also frequently used in automotive applications to monitor and control air conditioning and seat warming for passenger cabins. Green energy resources like wind turbines encounter potentially damaging conditions in cold climates.
When to use ring lug thermistor temperature sensor?
Ring lug thermistor temperature sensor probes are often mounted to heat sinks to measure the operating temperature of power components. They are also increasingly used on lithium ion battery terminals to monitor battery temperature during the charge and discharge cycles for efficiency and safety. 1. Protection of the Thermistor from Moisture