Miniature high-precision pressure transmitter

Miniature high-precision pressure transmitterIt has multiple models, ranges, process connection forms, and materials. It can be widely used in many industrial fields such as petroleum, chemical, power, metallurgy, pharmaceuticals, and food, and can adapt to various occasions and media of industrial measurement. It is an ideal upgraded product for traditional pressure gauges and pressure transmitters, and an ideal pressure measuring instrument in the field of industrial automation.

Main Features

High stability: better than 0.1% of full scale per year.
Small temperature deviation: Due to the elimination of the intermediate liquid in the measuring element, the sensor not only achieves high measurement accuracy, but is also less affected by temperature.
Good reliability: Using large-scale ICs, the circuit has good reliability and strong anti-interference performance.
Wide applicability: The product has multiple models, various process connection forms, and multiple manufacturing materials, which can adapt to various media in industrial measurement.
Easy installation and maintenance: The product has a reasonable structure, small size, light weight, and can be installed directly at any position.

Miniature high-precision pressure transmitterworking principle

The instrument converts the temperature signal into an electrical signal through a temperature sensor, which is then amplified and filtered by a preamplifier before being sent to the A/D conversion module of the CPU for analog-to-digital conversion. Finally, the data is processed, displayed, and PWM output by the CPU. The schematic diagram is as follows:

The pressure of the measured medium is directly applied to the ceramic diaphragm of the sensor, causing the diaphragm to produce a small displacement proportional to the pressure of the medium. Under normal working conditions, the maximum displacement of the diaphragm is not more than 0.025 millimeters. After the electronic circuit detects this displacement, it is converted into a standard industrial measurement signal corresponding to this pressure. During overpressure, the diaphragm is directly attached to a sturdy ceramic substrate. As the gap between the diaphragm and the substrate is only 0.1 millimeters, the maximum displacement of the diaphragm during overpressure can only be 0.1 millimeters. Therefore, the structure ensures that the diaphragm will not undergo excessive deformation, and the sensor has good stability and high reliability.

Technical Specifications
Accuracy level: Level 0.5
Return difference: 0.1% FS
Temperature influence: ± 0.1%/10 ℃
Working voltage: DC 13V~30V
Annual stability: ± 0.2%
Signal output: 4-20mA
Allowable overvoltage: 150% range
Dimensions: 120 × 60 × 100 max
Maximum pressure: 200% range
Allowable temperature: medium -20~70 ℃, environment -20~80 ℃

Precautions

Lower the fixing screw of the GMD connector and remove the connector to see Figure 2, but you must use a camera to pry the small plastic snap spring in the screw hole towards the middle before you can open the connector and see the wiring terminals.

Standard range table