HIT Devices Ltd., is the World-class Heating Head Manufacturer

HIT Devices' heating head does not require a thermocouple or thermistor as it has a capability to measure the temperature of heating head substrate while in operation in real-time with good time response.
The following samples are typical temperature measuring methods.

Temperature Measuring Method Using Main Heating Element

Connect the sensing resistor Rs1 in series with the main heating element R1 for measurement.
The temperature coefficient of resistance for the main heating element R1 is "+ 0.15%/°C" and the temperature while being heated can be found by measuring the voltage across the resistor Rs1.

    R1 =Rs1 x ( Drive Voltage - Vs1 ) / Vs1

Therefore, the temperature change in °C = % change of R1 / 0.15

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Temperature Measuring Method Using Temperature Sensing Element

Connect the sensing resistor Rs2 in series with the temperature sensing element R2 for measurement.
The temperature coefficient of resistance for the sensing element R2 is "+ 0.15%/°C" and the temperature while being heated can be found by measuring the voltage across the resistor R2.

    R2 =Rs2 x V2 / (Measuring Voltage - V2)

Therefore, the temperature change in °C = % change of R2 / 0.15

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Please contact us for more detailed information on the temperature measurement methods.