The characteristic of DS18B20 digital temperature sensor is introduced
digital sensor is made up of analog sensor ( Resistance strain type) And digital conversion module composed of two parts. Digital module by highly integrated electronic circuits, the use of SMT surface mount technology, mainly including amplifier, AD converter, microprocessor ( CPU) , memory, interface circuit, RS485) And digital temperature sensor, etc.
the characteristics of the digital sensors:
first, digital sensors using integrated AD conversion circuit, digital signal transmission and digital filtering technology, the sensor signal transmission distance is far away, up to 1200 m, strong anti-jamming capability, digital sensors in analog signal transmission distance is very short, and the sensor shell Elastomer) Itself is a good shielding case, only the two characteristic had decided its anti-interference ability of advantage, to a great extent, improve the stability of the sensor.
in the second place, the secrecy good, once found will automatically take error alarm, guarantee the safety and accuracy of the data. Truck mounted sensors using analog sensor is common, shouqin company around several analogue truck company almost all have been installed a sensor, caused great economic losses. Due to its small volume and easy installation, so it is not easy to be found, on the measurement data security caused great hidden trouble.
third, because the digital sensors has automatic collection and pretreatment, storage and memory function, and has the only tag, only more sensors and transmitte scale can check the status of each sensor, respectively, after convenient for fault diagnosis. Shouqin company now use digital sensors YCCA - for daiwa company production Ⅱ- Type D, single sensor bearing capacity is 50000 kg. Initially, shouqin company used by truck or rail weighbridge are analog sensors, equipment working condition is not stable, every time there is a problem which is difficult to judge the sensor has a problem, only can only be opened by junction box to check every sensor signal, used deduction to check them one by one, spent a long time to find the defective sensor.
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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor