pressure gaugeofclassification

Pressure gauges can be divided into precision pressure gauges and general pressure gauges based on their measurement accuracy. The measurement accuracy levels of precision pressure gauges are 0.1, 0.16, 0.25, 0.4, and 0.05, respectively. The measurement accuracy levels of general pressure gauges are 1.0, 1.6, 2.5, and 4.0, respectively.

Pressure gauges are classified into general pressure gauges, pressure gauges, and differential pressure gauges based on their indicated pressure benchmarks. Generally, pressure gauges are based on atmospheric pressure, absolute pressure gauges are based on pressure zero, and differential pressure gauges measure the difference between two measured pressures.

Pressure gauges are divided into vacuum gauges, pressure vacuum gauges, differential gauges, low pressure gauges, medium pressure gauges, and high pressure gauges according to their measurement range. Vacuum gauges are used to measure pressure values below atmospheric pressure, pressure vacuum gauges are used to measure pressure values below and above atmospheric pressure, micro pressure gauges are used to measure pressure values below 60000PA, low-pressure gauges are used to measure pressure values between 0-6MPA, medium pressure gauges are used to measure pressure values between 10-60MPA, and high-pressure gauges are used to measure pressure values above 100MPA.

Pressure gauges are divided into pointer pressure gauges and digital pressure gauges according to their display methods.

The shell of the shock resistant pressure gauge is made into a fully sealed structure, and damping oil (now mostly filled with silicone oil) is filled inside the shell. Due to its damping effect, it can be used in measurement places where working environment vibration or medium pressure (load) pulsation occurs.

Pressure gauges with electric contact control switches can achieve signaling, alarm or control functions.

Pressure gauges with remote transmission mechanisms can provide electrical signals required in industrial engineering, such as resistance signals or standard DC current signals.

The isolator (chemical seal) used in the diaphragm meter can isolate the measured medium from the instrument through the isolation diaphragm, in order to measure the pressure of strongly corrosive, high-pressure, and easily crystallizable media.

The elastic sensitive element in mechanical pressure gauges undergoes elastic deformation with changes in pressure. Mechanical pressure gauges are classified based on sensitive materials such as spring tubes (Bourdon tubes), diaphragms, bellows, and bellows. Sensitive components are generally made of copper alloys, stainless steel, or special materials.

Spring tubes (Bourdon tubes) are divided into C-type tubes, reed tubes, spiral tubes, and other types. Generally, cold work hardened material billets are used, which have high plasticity in the annealed state. After pressure processing, cold work hardening, and qualitative treatment, high elasticity and strength are obtained. Under the action of internal pressure, the spring tube can easily convert pressure into elastic displacement at the free end of the spring tube by utilizing its elastic properties. The measurement range of a spring tube is generally between 0.1MPA and 250MPA.

The membrane sensitive element is a circular membrane with waves. The membrane itself is located between two flanges, or welded to a flange or its edge is sandwiched between two flanges. One side of the membrane is subjected to the pressure of the measuring medium, and the small bending deformation generated by the membrane can be used to indirectly measure the pressure of the medium. The magnitude of the pressure is displayed by a pointer. Compared with the Bourdon tube, the membrane has a higher transmission force. Due to the fixed edges around the membrane itself, it has good vibration resistance. The diaphragm pressure gauge can achieve high overpressure protection (such as attaching the diaphragm to the upper flange). The membrane can also be coated with a protective layer to improve its corrosion resistance. Using measures such as open flanges, flushing, and opening, diaphragm pressure gauges can be used to measure media with high viscosity, uncleanliness, and crystallization. The pressure measurement range of the diaphragm pressure gauge is 1600PA~2.5MPA. The sensitive element of the diaphragm box is composed of two circular wave shaped diaphragms that are interlocked together. The pressure of the measuring medium acts on the inside of the diaphragm chamber, and the resulting deformation can be used to indirectly measure the pressure of the medium. The magnitude of the pressure value is displayed by a pointer. Diaphragm pressure gauges are generally used to measure the micro pressure of gases and have a certain degree of overpressure protection capability. When several sensitive components of the diaphragm are combined, they will generate a large transmission force to measure extremely small pressures. The pressure measurement range of the bellows pressure gauge is 250PA