The principle and application of ceramic pressure thermocouple sensor

Ceramic is a recognized high flexibility, corrosion resistance, wear resistance, resistance to impact and vibration of the material. Thermal stability properties of ceramics and its thick film resistance temperature range up to - can make it work 40 ~ 135 ℃, and with high precision, high stability of the measurement. Electrical insulation level & gt; 2 kv, the output signal is strong, long-term stability is good. High characteristics, low price of ceramic thermocouple sensors will be the development direction of pressure thermocouple sensor, in Europe and the United States has a tendency to fully replace other types of thermocouple sensor, also more and more users in China use ceramic thermocouple sensor instead of diffused silicon pressure thermocouple sensor.

no liquid corrosion resistant ceramic pressure thermocouple sensor, pressure directly in front of the ceramic membrane surface, make the diaphragm produces tiny deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a wheatstone bridge, Bridge) , due to the piezoresistive effect of pressure-sensitive resistance, make the bridge produces a is proportional to the pressure of the highly linear, and the excitation voltage is proportional to the voltage signal and standard signal according to the different calibration of pressure range is 2. 0 to 3. 0 to 3. 3 mVV is, etc. , can be compatible and strain thermocouple sensor. With a laser calibration, thermocouple sensor has the very high temperature stability and time stability, thermocouple sensor with temperature compensation 0 ~ 70 ℃, and can direct contact with most of the media.

industrial pressure thermocouple sensor

there are many types of mechanical thermocouple sensor, such as resistance strain weighing thermocouple sensor, thermocouple semiconductor strain gauge pressure sensors, piezoresistive pressure thermocouple sensors, inductive pressure thermocouple sensor, capacitive pressure sensor thermocouple, thermocouple resonant pressure sensors and capacitive acceleration thermocouple sensor etc. But it is the most widely used piezoresistive pressure thermocouple sensor, it has a very low price and high accuracy and good linear characteristic. Here we mainly introduce the type of thermocouple sensor.

in the decompression resistance type thermocouple sensor, we first meet resistance strain slice of this element. Resistance strain gauge is a thing to be tested on the strain change into an electrical signal sensitive device. It is a piezoresistive type strain is one of the main part of thermocouple sensor. Resistance strain gauge used mostly metal resistance strain gauge and semiconductor strain gauge. Metal resistance strain gauge and filamentous strain gauge and metal foil strain gauge. Usually will strain gauge through the special adhesive agent and adhesive on the produce mechanical strain matrix, when the matrix stress when the stress changes, the resistance strain gauge also together to produce deformation, which changes the resistance strain gauge, to make the change on the resistance of voltage. This strain gauge in force when the resistance changes usually smaller, general this kind of strain gauge of strain bridge, and through the subsequent instrumentation amplifier amplification, and then transfer to a processing circuit ( Usually the AD conversion and CPU) Displays or actuators.