NTC heat dissipation coefficient.Led PIR Sensor wholesale

　　The heat dissipation coefficient (δ) refers to the power required to raise the temperature of the thermistor element by 1°C by self-heating in a state of thermal equilibrium.

　　The values in the specifications are generally typical values measured in still air at 25°C.

　　Maximum power

　　At rated ambient temperature, the maximum power that can be continuously loaded with load, also known as "rated power".

　　It is usually a value calculated from the following formula with a rated ambient temperature of 25°C.

　　Rated power = heat dissipation coefficient × (maximum operating temperature -25°C)

　　Thermal response time constant corresponding to changes in ambient temperature

　　It refers to the time required for the thermistor element to produce a temperature change of 63.2% of the temperature difference between the initial temperature and the final temperature when the ambient temperature of the thermistor changes rapidly under zero-load conditions. When the ambient temperature of the thermistor changes from T1 to T2, the following relationship exists between the elapsed time t and the temperature T of the thermistor.

　　The constant τ is called the thermal response time constant.

　　In the above formula, if t=τ, then (T-T1)/(T2-T1)=0.632.

　　In other words, as described in the above definition, the time required for the thermistor to produce a temperature change of 63.2% of the initial temperature difference is the thermal response time constant.

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Diameter 3mm size

HW 802

PIR Lens 7707-5