Pt100 temperature sensor
is a kind of converting temperature variables can transmit the standardization of the output signal of the instrument.
It is mainly used for industrial process measurement and control of the temperature parameters.
With sensor transmitter usually consists of two parts: sensor and signal converters.
The sensor is mainly the thermocouple or heat resistance;
Signal converter mainly consists of measurement unit, signal processing and conversion unit (
Due to industrial heat resistance and thermocouple indexing table is standardized, so signal converter as a separate product is called the transmitter)
And some transmitter increases the display unit, some also have the function of field bus.
PT100 temperature sensor measurement methods are: constant current constant voltage method in the traditional instrument, generally in this way, after the construction of constant current or constant voltage method, using ohm's law, and calculate the PT100 resistance, then the query indexing table, temperature.
* this method is simple and general.
Common sensor interface UTI method of the traditional method is simple, but there are a lot of shortcomings.
Use common sensor interface chip, only need a reference resistor is not sensitive to temperature, Pt100 connected to UTI circuit, can be obtained by MCU Pt100 and reference the proportion of resistance, resistance and temperature is obtained.
This method is very suitable for microprocessor-based (
System, UTI all information only through a MCU compatible signal output, so that greatly reduced the schism between modules outside wiring and coupler.
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The main products are PT100 temperature sensor, temperature sensor, humidity sensors, temperature transmitter, pressure sensor and so on.
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