Digital pressure gauge is a new type of intelligent and multi-functional measuring instrument integrating sensing technology, electronic technology and microcomputer technology. It can not only meet the pressure measurement in the industrial field, but also can be used as a standard gauge in the laboratory. According to the structure, the digital pressure gauge can be divided into integral type and separate type. Most of the ones used in the field are integrated, that is, the sensing, conversion, and display are integrated and installed in one watch case: the separated ones are mostly used as standard meters in laboratories, and the sensors are connected to the host through cables. The components are all installed in the main chassis.
Working principle of digital pressure gauge
The pressure of the measured medium acts on the pressure-sensitive diaphragm of the sensor, and the sensor amplifies the sensed electrical signal, A/D converts it, sends it to the CPU for processing, and then outputs it as an analog or digital value, thereby realizing pressure display, control, and transmission The purpose; the microprocessor can automatically compensate the zero drift, temperature drift, nonlinearity, etc. of the instrument to ensure the high precision of the instrument under the conditions of use.
The difference between pointer pressure gauge and digital pressure gauge
Ordinary pointer pressure gauges are mainly composed of pressure-inducing joints, pressure-sensitive elements (spring tubes), transmission amplifiers (movements), and other parts. The pressure medium is transmitted to the inside of the spring tube by the pressure joint, and the spring tube is deformed after being stressed, and linked to the sector gear in the movement components, the pointer rotates with the gear to indicate different pressures on the dial.
A digital pressure gauge uses a pressure sensor as a pressure-sensitive element, and the most commonly used one is a diffused silicon pressure sensor. The silicon single crystal material used in this sensor will produce a very small strain under the action of an external force, and the state of the electronic energy level of its internal atomic structure will change, resulting in a drastic change in its resistivity. The resistance of the sensor can also vary greatly, an effect known as the piezoresistive effect. We detect this resistance change through an electronic circuit, and convert it into a pressure value and display it on the screen.
The digital pressure gauge adopts the working mode of the full electronic circuit, only the pressure sensor produces a very small physical strain when the pressure changes, which determines its high measurement accuracy, high resolution, long service life, and intuitive readings; the full electronic circuit is almost no It will be affected by external vibrations, and its anti-seismic performance is outstanding; and it is easy to realize functions such as conversion of various pressure units, automatic peak recording, remote data transmission, and electrical contact control. At present, in the fields of high measurement accuracy and industrial automatic control, digital pressure gauges are replacing traditional pointer pressure gauges in large quantities.
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