A pressure transmitter is a device that measures the pressure of a fluid or gas in a process and converts it into an electrical signal that can be used for monitoring or control purposes. Pressure transmitters have a few different operating principles to accomplish this:
Piezoresistive pressure transmitters
One of the first components of a piezoresistive pressure transmitter is a resistive strain gauge. It is an active device that converts strain changes on the DUT into an electrical signal.
In general, the strain gauge is tightly bonded to the substrate, and the substrate is mechanically strained with a special adhesive. When the stress of the substrate changes, the resistive strain gauge also deforms. Change the resistance value of the strain gauge so that the voltage applied to the resistor changes. The transmitter is characterized by its low price, high accuracy and outstanding linearity.
Diffusion silicon pressure transmitter
The diffusion silicon pressure transmitter was introduced in the mid-1990s. It takes advantage of the piezoresistive effect of elastic elements. When the pressure of the measured medium directly acts on the barrier of the sensor, the barrier undergoes a micro-displacement that is proportional to the pressure of the medium, thus changing the resistance value of the sensor. This change is detected electronically. and convert and output a consistent standard signal.
Compared with traditional products, the transmitter has the advantages of advanced technology, reliable performance, convenient installation, high precision and small size.
Ceramic pressure transmitter
Corrosion-resistant ceramic pressure transmitters do not have liquid transfer. When the pressure effect is applied to the ceramic diaphragm, the diaphragm is slightly deformed. A thick-film resistor printed on the reverse side of the ceramic diaphragm is passed through a Wheatstone bridge (closed bridge) connected to it. Outputs a voltage signal that is divided into the excitation voltage.
How ceramic pressure sensors work
The pressure physical quantities are measured by the transmitter's built-in circuitry and converted into a consistent standard signal.
The transmitter is capable of introducing a wide range of media (corrosive and non-corrosive gases, liquids) directly into the ceramic barrier.
The thermal stability of ceramics and their thick film resistance allow them to operate in temperatures up to -40°C to 135°C.
Therefore, it has high measurement accuracy, good stability, strong output signal and low price.
Piezoelectric pressure transmitters
Piezoelectric pressure transmitters work on the piezoelectric effect.
Piezoelectric pressure transmitter crystals are anisotropic, and when a force is applied in a certain direction, the crystal is capable of an electrical effect. When the mechanical force is removed, it will again recover to an uncharged condition. The primary piezoelectric materials used in sensors are quartz, potassium sodium tartrate, and ammonium dihydrogen phosphate.
Transmitters are primarily used for the measurement of acceleration and pressure. It has the characteristics of simple structure, small size, light weight and long service life. However, it can only be used to measure dynamic stresses.
Capacitive pressure transmitters
A capacitive pressure transmitter consists of electrodes on both sides of a measuring diaphragm and an insulating sheet to form a capacitance.
When the pressure on both sides is inconsistent, the displacement of the measured barrier is proportional to the pressure difference. As a result, the capacitance on both sides is not equal.
After oscillation and demodulation, it is converted into a signal that is divided with pressure. The pressure physical quantity is then measured and converted into a consistent standard signal through the transmission circuit.
High precision, corrosion resistance, pollution resistance, good stability. It is recognized at home and abroad as an aspiring instrument for detecting low vacuum pressure. It is mainly used in various fields of civilian industry, and plays a common role in the aerospace industry, nuclear industry and other military industries.
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