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Pressure transmitter works with the use of different materials
Dec 21, 2017

1, pressure transmitter transmitter
When it comes to piezoresistive pressure transmitters, let's first look at the components of a strain gage. A strain gauge is a sensitive device that converts a strain change on a DUT into an electrical signal. It is one of the major components of a piezoresistive strain gage. Resistance strain gauge is the most widely used metal strain gauge and semiconductor strain gauge two. Metal resistance strain gauges and filiform strain gauges and metal foil strain gauge two. Strain gages are usually adhered to each other by a special adhesive to produce a mechanical strain matrix. When the stress on the substrate changes, the strain gages also deform together to change the resistance of the strain gauge so that The voltage applied to the resistor changes.

2, ceramic pressure transmitter
Principle Anti-corrosion pressure transmitter without liquid transmission, the pressure directly on the front surface of the ceramic diaphragm, the diaphragm to produce small deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a Wheatstone bridge (Closed bridge). Due to the piezoresistive effect of the varistor, the bridge generates a highly linear voltage proportional to the pressure and proportional to the excitation voltage. The standard signal is calibrated to 2.0 / 3.0 according to the pressure range / 3.3 mV / V, etc., can be compatible with the strain sensor. The laser calibration, the sensor has a high temperature stability and time stability, the sensor comes with temperature compensation 0 ~ 70 ℃, and most media can be in direct contact with.
Ceramic is a recognized material that is highly elastic, corrosion-resistant, abrasion-resistant, impact-resistant and vibrational. The thermal stability of ceramic and its thick film resistor allows it to operate over the temperature range of -40 to 135 ° C with the high accuracy and stability of measurements. Electrical insulation> 2kV, the output signal, long-term stability. High-performance, low-cost ceramic sensor pressure transmitter will be the development direction.

3, diffused silicon pressure transmitter
The pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), causing the diaphragm to produce a micro-displacement proportional to the medium pressure, changing the resistance of the sensor and detecting this change with electronic circuitry and The conversion outputs a standard measurement signal corresponding to this pressure.

4, piezoelectric pressure transmitter sensor
Piezoelectric sensors are mainly used in the piezoelectric materials include quartz, sodium potassium tartrate and dihydrogen phosphate. Quartz (silica) is a natural crystal, the piezoelectric effect is found in this crystal, within a certain temperature range, the piezoelectric properties have been, but the temperature exceeds this range, the piezoelectric properties completely Disappear (this high temperature is the so-called "Curie point"). Quartz is gradually being replaced by other piezoelectric crystals due to the small changes in electric field (ie, lower piezoelectric coefficients) as the stress changes. Potassium sodium tartrate, on the other hand, has great piezoelectricity and piezoelectricity, but it can only be applied under low ambient and relative humidity. Dihydrogen phosphate is an artificial crystal, can withstand high temperatures and high humidity, it has been widely used. Piezoelectric effect is now also applied to polycrystalline body, such as the current piezoelectric ceramics, including barium titanate piezoelectric ceramics, PZT, niobate-based piezoelectric ceramics, lead magnesium niobate piezoelectric ceramics and so on.

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