Definition and selection of pressure gauges for different pressures

1. Pressure gauge
Take the pressure zero as a reference, the pressure higher than the pressure zero.
2. Positive pressure gauge
The pressure is higher than atmospheric pressure based on atmospheric pressure (gauge pressure zero, the same below).
3. Negative pressure (vacuum) meter
The pressure is less than atmospheric pressure based on atmospheric pressure.
4. Differential pressure gauge
The difference between the two pressures.
5. Gauge pressure gauge
Based on atmospheric pressure, a pressure value greater or less than atmospheric pressure.
6. Pressure gauge
Use atmospheric pressure as a reference and used to measure instruments that are greater than atmospheric pressure.
7. Vacuum gauge
Use atmospheric pressure as a reference, used to measure instruments that are less than atmospheric pressure.
8. Pressure vacuum gauge
Based on atmospheric pressure, it is used to measure instruments that are greater than and less than atmospheric pressure.
9. Install the pressure gauge directly
Pressure gauge with threaded joint.
10. Built-in (pan-mounted) pressure gauge
The shell has a supporting device, which is suitable for the pressure gauge installed on the instrument panel (screen).
11. General pressure gauge
Pressure gauges, vacuum gauges and pressure-vacuum gauges with a degree level equal to or lower than 1.0.
12. Convex mounted (wall mounted) pressure gauge
A pressure gauge mounted on the plate (screen) with the flange on the back of the housing. The entire watch protrudes in front of the disc (screen).

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