Pressure transmitter working principle and principle structure
Unlike the other regulators, the maximum function of the pressure transmitter is to directly display the pressure in the pipeline and to feed back the signal to the PLC control system.
First, the working principle
The RL3051 pressure transmitter uses a sputtered film sensor and a ceramic pressure sensor as sensitive components. It uses a dedicated integrated module to achieve pressure changes in the liquid level, gas, steam, etc. through fine temperature drift, zero point, and nonlinear compensation. Accurate measurement and transmission. Realize the ideal monitoring of pressure vacuum in various places of industrial and mining enterprises, research institutes and other departments.
Second, the principle structure
The electrical components that the pressure transmitter feels pressure are generally resistance strain gauges, which are sensitive devices that convert the pressure on the device under test into an electrical signal. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. The metal resistance strain gauge has two kinds of filament strain gauges and metal foil strain gauges. Usually, the strain gauge is tightly bonded to the mechanical strain matrix by a special adhesive. When the stress changes due to the force of the substrate, the strain gauges are also deformed together, so that the resistance of the strain gauge changes, thereby adding The voltage across the resistor changes.
Third, the principle related features
1. The pressure transmitter has the characteristics of reliable operation and stable performance;
2, dedicated V / I integrated circuit, fewer peripheral devices, high reliability, simple and easy to maintain, small size, light weight, installation and commissioning is extremely convenient;
3, aluminum alloy die-casting shell, three-terminal isolation, electrostatic spray protection layer, durable;
4, 4-20mA DC two-wire system signal transmission, strong anti-interference ability, long transmission distance;
5, the site reading is very convenient. Can be used to measure viscous, crystalline and corrosive media;
6, high accuracy, high stability. In addition to the original imported sensor has been corrected by laser, the comprehensive temperature drift and nonlinearity of the whole machine in the operating temperature range are finely compensated.