What is B value for thermistor?
A thermistor’s “b” value, or beta value, is an indication of the shape of the curve representing the relationship between resistance and temperature of an NTC thermistor.
What is thermistor tolerance?
Thermistors are categorized by their resistance tolerance: the ± variance of resistance at any given temperature. This parameter ranges anywhere from 0.5% to +10%, and is usually listed as the resistance tolerance at 25°C in data sheets.
How do you read the thermistor value?
Indicates how much the resistance can vary from the specified value. Usually expressed in percent (e.g. 1%, 10%, etc). For example, if the specified resistance at 25°C for a thermistor with 10% tolerance is 10,000 ohms then the measured resistance at that temperature can range from 9,000 ohms to 11000 ohms.
What is B25 85?
B25/85 (expressed in K) is normally used to characterize and. compare different ceramics. Tolerance on B (or B25/85) is.
What are 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.
Do thermistors have high stability?
Thermistors are considered stable at and below room temperature, but as exposure temperature goes up, drifting will occur. Temperature cycling primarily affects stability through high-temperature cycles. A glass-coated bead thermistor can match and exceed stability.
What is a 10K thermistor?
The enclosed negative temperature coefficient (NTC) thermistor, p/n 1600-10K, works by translating temperature into resistance, with resistance decreasing as temperature increases (hence the ‘negative coefficient’).
What is a 10k NTC thermistor?
This is a type of resistor whose resistance varies with change in temperature. These NTC thermistors are made up from the combination of metal oxides which passed through sintering process which gives negative electrical resistance versus temperature (R/T) relationship to it.
What is the b value of the NTC thermistor?
B value is the constant value of NTC thermistor. That is, NTC thermistor chip (semiconductor ceramic) after high temperature sintering, Forming a negative temperature coefficient material having a resistivity. Different formulations and sintering temperature of the formation of the resistance, have different B value,So called the material constant.
How is the resistance of a thermistor measured?
The manner in which the resistance of a thermistor decreases is related to a constant known in the thermistor industry as beta(β). Beta is measured in degrees Kelvin (K) and is computed based on the formulation given below. Where: Rt1 = Resistance at Temperature 1 Rt2= Resistance at Temperature 2 T1= Temperature 1 (K) T2= Temperature 2 in (K)
Why are thermistors used in inductive electrical equipment?
Inductive electrical equipment such as motors, transformers, ballast lighting, etc, suffer from excessive inrush currents when they are first turned “ON”. But series connected thermistors can also be used to effectively limit any high initial currents to a safe value.
What happens when a voltage drop is passed through a thermistor?
Hopefully by now we realise that a thermistor is a resistive device and therefore according to Ohms law, if we pass a current through it, a voltage drop will be produced across it.