The concept of pressure here actually refers to the pressure in physics, that is, the size of the pressure per unit area.
Absolute pressure: the pressure higher than the absolute pressure zero position, based on the absolute pressure zero position.
Positive pressure: a pressure higher than atmospheric pressure based on atmospheric pressure.
Negative pressure (vacuum): The pressure lower than atmospheric pressure based on atmospheric pressure.
Differential pressure: the difference between two pressures.
Gauge pressure: based on atmospheric pressure, pressure greater than or less than atmospheric pressure.
Pressure gauge: Based on atmospheric pressure, it is used to measure instruments that are less than or greater than atmospheric pressure.
Pressure gauge types can be divided into precision pressure gauges and general pressure gauges according to their measurement accuracy. The measurement accuracy grades of precision pressure gauges are 0.1, 0.16, 0.25, and 0.4 respectively; the measurement accuracy grades of general pressure gauges are 1.0, 1.6, 2.5, and 4.0 grades respectively.
Pressure gauge types are divided into general pressure gauges, absolute pressure gauges, and differential pressure gauges according to their different standards for indicating pressure. General pressure gauges are based on atmospheric pressure; absolute pressure gauges are based on absolute pressure zero; differential pressure gauges measure the difference between two measured pressures.
The pressure gauge is divided into vacuum gauge, pressure vacuum gauge, micro pressure gauge, low pressure gauge, medium pressure gauge and high pressure gauge according to its measuring range. The vacuum gauge is used to measure the pressure value less than atmospheric pressure; the pressure vacuum gauge is used to measure the pressure value less than and greater than the atmospheric pressure; the micro pressure gauge is used to measure the pressure value less than 60000 Pa; the low pressure gauge is used to measure the pressure value of 0~6MPa; the medium pressure gauge is used to measure the pressure value of 10~60MPa; the high pressure gauge is used to measure the pressure value above 100MPa.
The shell of the shock-resistant pressure gauge is made of a fully sealed structure, and the shell is filled with damping oil. Due to its damping effect, it can be used in the measurement place of working environment vibration or medium pressure (load) pulsation.
The pressure gauge with electric contact control switch can realize the alarm or control function.
A pressure gauge with a remote transmission mechanism can provide electrical signals (such as resistance signals or standard DC current signals) required in industrial engineering.
The isolator (chemical seal) used in the diaphragm meter can isolate the measured medium from the instrument through the isolating diaphragm, so as to measure the pressure of the medium with strong corrosion, high temperature and easy crystallization.