Pressure thermocouple sensor common problems and operation steps

Pressure thermocouple sensor is industrial practice of the thermocouple sensors is most commonly used a thermocouple sensor, and we usually use the pressure of the thermocouple sensor made mainly using piezoelectric effect, the thermocouple sensor is also known as piezoelectric thermocouple sensor. We know that the crystals are anisotropic, amorphous is isotropic. Some crystal medium, when a certain direction by mechanical force deformation occurs, is the polarization effect; When a mechanical force, after removed and will be returned to the electrically neutral state, that is, when the pressure, some crystal may produce electric effect, this is the so-called polarization effect. Scientists is that pressure thermocouple sensor is developed according to this effect. Piezoelectric thermocouple sensor in the main use of piezoelectric materials price pressure thermocouple sensor consists of quartz, sodium potassium tartrate and ammonium dihydrogen phosphate. The quartz ( Silicon dioxide) Is a kind of natural crystal, the piezoelectric effect is found in the crystal, within certain limits of temperature, the piezoelectric properties have always existed, but after the temperature exceeds the range, the piezoelectric properties completely disappear, The high temperature is called the Curie point) 。

pressure thermocouple sensor is how it works:

section, the valve inlet pressure thermocouple sensor rear intake manifold absolute pressure, according to the size of the engine speed and load it detect the change of the manifold absolute pressure, and then converted to voltage signal to the electronic controller ( ECU) , the size of ECU according to the signal voltage, control the size of the basic fuel injection quantity.

inlet pressure thermocouple sensor sort is more, a pressure sensitive resistive, capacitive, etc. Because the pressure sensitive resistance type has fast response time, high precision, small size and the advantages of flexible installation, and therefore is widely used in type D injection system.

pressure sensitive resistance type inlet pressure of the thermocouple sensor working principle: the strain resistor R1, R2, R3 and R4, they constitute the huis, bridge and silicon diaphragm sticking together. Silicon diaphragm within the manifold absolute pressure under the action of deformation, thus cause the change of the resistance strain resistance R, manifold absolute pressure is higher, the greater the deformation of silicon diaphragm, thus the greater the resistance R resistance changes also. I. e. , the change of the silicon diaphragm mechanical into electrical signals, after again by integrated circuit amplifier output to the ECU.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor