Large truck barometer (air brake)

Under normal circumstances, the gauge barometer of freight cars is 6-8 (bar), which generally does not exceed 9 (bar).

Take the pointer tire pressure gauge as an example. Connect the wheel tire pressure gauge to the valve tire and store it until the pointer reaches the maximum value, then read the tire pressure value, and finally loosen the valve cover. When measuring, look at the black circle, tire pressure value, and 6, which is also the number of black circles. A typical tire pressure gauge has two rings, one is inch psi and the other is kg/cm 2.

Extended data:

Precautions for instrument panel barometer:

1. During the measurement, the user must pay attention to the alignment between the barometer and the valve port. There should be no air leakage, otherwise the measured value is incorrect. The value displayed on the instrument is tire pressure.

2. When in use, the user tightly presses the valve joint on the tire valve, so that the valve core is pressed in, and the reading of the indicator is the tire pressure. When using, please put the barometer horizontally, and tap the instrument shell or instrument glass surface with your fingers before reading to eliminate the friction in the transmission mechanism.

3. When the pointer overlaps with the mirror pointer, the value indicated by the pointer is the pressure value, and the reading is accurate to the decimal point. Read the temperature on the barometer to one decimal place.

4. The air pressure reading on the instrument should be used and will only be displayed after the following corrections are made. Temperature correction is necessary, because the change of ambient temperature will affect the elasticity of metal in the instrument.