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STF128-F1H-012F0 Relevant principles of pressure transmitters (for reference to understand such products)
(1) Principle of resistance strain gauge pressure transmitter STF128-F1H-012F0
The electrical component of a pressure transmitter that senses pressure is generally a resistance strain gauge, which is a sensitive device that converts the pressure on the device under test into an electrical signal. The most commonly used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. There are two types of metal resistance strain gauges: wire strain gauges and metal foil strain gauges. Usually, the strain gauge is tightly bonded to the base body that generates mechanical strain through a special adhesive. When the base body is stressed and the stress changes, the resistance strain gauge also deforms, causing the resistance value of the strain gauge to change, thereby causing the stress to change. The voltage across the resistor changes.
(2) Principle of piezoresistive pressure transmitter STF128-F1H-012F0
Take the hh21882188 pressure transmitter as an example. It consists of a piezoresistive sensor and a signal conversion module. The core component of the sensor is a monocrystalline silicon wafer. When the monocrystalline silicon wafer is under pressure, its resistivity changes. Through the semiconductor The planar process diffuses four resistors on the silicon wafer and connects them to form a bridge. Under the action of a constant current, a voltage signal proportional to the pressure signal can be output. The signal conversion module processes the voltage signal of the sensor and converts it into 4- 20mA standard signal. This type of pressure transmitter can be used to measure the pressure, liquid level and other parameters of fluids (liquids, gases and steam), and convert the measured signal into a 4-20mA standard signal output, which can be used for indication, recording and The input signal of the regulator has the advantages of small size, light weight, high precision and low price. It can be equipped with functions such as on-site indicating meter, zero point migration, range expansion, etc. It can be intrinsically safe and explosion-proof, and has industrial pressure transmission. all functions of the device.
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