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Four major categories of eja pressure transmitters
The eja pressure transmitter is a hydraulic electrical switching element that uses the pressure of the liquid to open and close the electrical contacts. When the system pressure reaches the setting value of the eja pressure transmitter, an electrical signal is sent to make the electrical components (such as electromagnets, motors, time relays, electromagnetic clutches, etc.) actuate, so that the oil pressure path is relieved and reversed, and the actuator is realized. Sequential action, or shut down the motor to stop the system, play a role in security and so on.
Eja Pressure Transmitters Category:
There are mainly capacitive pressure transmitters and diffusion silicon pressure transmitters, ceramic pressure transmitters, and strain-type pressure transmitters.
1. Capacitive
When the pressure directly acts on the surface of the diaphragm, causing a slight deformation of the diaphragm, the high-precision circuit on the diaphragm transforms this tiny deformation into a highly linear voltage proportional to the pressure and proportional to the excitation voltage. The signal is then converted to an industry-standard 4-2OmA current signal or 1-5V voltage signal using a dedicated chip. Because the measurement diaphragm uses a standardized integrated circuit, which contains linear and temperature compensation circuits, it can achieve high precision and high stability. The transmission circuit uses a dedicated two-wire chip, which can ensure the output of two-wire 4-2OmA current signal To facilitate on-site wiring.
2. Diffused silicon
The pressure of the measured medium directly acts on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm generates a micro displacement proportional to the pressure of the medium, so that the resistance value of the sensor changes, and the change is detected by the electronic circuit, and The conversion outputs a standard measurement signal that corresponds to this pressure.
3. The ceramic pressure acts directly on the front surface of the ceramic diaphragm, causing a slight deformation of the diaphragm. The thick film resistor is printed on the back of the ceramic diaphragm and is connected to a Wheatstone bridge (closed bridge) due to the varistor The piezoresistive effect causes the bridge to produce a highly linear voltage proportional to the pressure and a voltage signal proportional to the excitation voltage.
Strain gauge
The resistance strain gauge is a sensitive device that converts the strain change on the device under test into an electrical signal. It is one of the main components of a piezoresistive strain transmitter. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal strain gauges are also available in wire strain gauges and metal foil strain gauges. Usually, the strain gauges are tightly bonded to a mechanical strain matrix through a special adhesive agent. When the stress of the base body changes, the strain gauges also deform together, so that the resistance of the strain gauges is changed, and thus The voltage applied to the resistor changes.