Common pressure transmitter classification and its working principle

Pressure transmitter is a commonly used sensor, widely used in industrial automation environment, involving many industries such as water and electricity, transportation construction, machine tool pipeline, production automation, etc. The types of pressure transmitters can be divided into the following categories: resistance pressure change transmitter, semiconductor pressure transmitter, piezoresistive pressure transmitter, inductive pressure transmitter, capacitive pressure transmitter, etc. The most widely used is the piezoresistive pressure transmitter. The following describes the common pressure transmitter classification. 1. Piezoresistive pressure transmitter resistance strain gauge is a sensitive device that converts the strain change on the measured component into an electrical signal. It is one of the main components of piezoresistive strain transmitters. The most widely used are metal resistance strain gauges and semiconductor strain gauges. Usually, the strain gauge is tightly bonded to the matrix that generates mechanical strain through a special adhesive. When the stress of the matrix changes, the resistance strain gauge is also deformed together, so that the resistance value of the strain gauge changes, so that the The voltage applied to the resistor changes. 2. Diffusion silicon pressure transmitter Diffusion silicon pressure transmitter means that the pressure of the detected medium directly acts on the diaphragm of the sensor, so that the diaphragm produces a micro displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes. , and use the electronic circuit to detect this change, and convert and output a standard measurement signal corresponding to this pressure. 3. Piezoelectric pressure transmitter The piezoelectric materials mainly used in piezoelectric sensors include quartz, potassium sodium tartrate and ammonium dihydrogen phosphate. Among them, quartz is a natural crystal, and the piezoelectric effect is found in quartz. Within a certain temperature range, the piezoelectric properties always exist. When the temperature exceeds this range, the piezoelectric properties disappear completely, accompanied by stress. The change of the electric field is very small, so the quartz is gradually replaced by other piezoelectric crystals. And potassium sodium tartrate has great piezoelectric sensitivity and piezoelectric coefficient, but it can only be applied in the environment of room temperature and low humidity. As for dihydrogen phosphate, it belongs to artificial crystal and can withstand high temperature and high humidity, so it has been widely used. The piezoelectric effect is now also applied to polycrystals. 4. Capacitive pressure transmitter ceramic capacitive sensors are suitable for the measurement of normal or corrosive media, such as gas or liquid, but are not prone to the use of precipitation, crystallization or stiffening materials. Mainly used in tank liquid level measurement, etc.
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