Pressure Gauge Display

Fig 1: Identifying Indicators On Pressure Gauge

Courtesy of AUDI OF AMERICA, LLC

Temperature scale for Refrigerant R1234yf (CF₃ CF = CH₂ ) in °C
Pressure scale in bar pressure

NOTE:

Pressure is measured in different units: 1 MPa (mega Pascal) corresponds to 10 bar (145 psi) positive pressure. 1 bar (14.5 psi) absolute pressure corresponds to 0 bar (0 psi) positive pressure and thus to the ambient pressure (atmospheric pressure).

This illustration shows the pressure gauge which shown the pressure on the low pressure side, the display here is in bar pressure gauge (can be recognized by the display "-1").

The pressure gauge may have one or more temperature scales next to the pressure scale. The R1234yf scale values are allocated respectively in the vapor pressure table. Since various refrigerants create different vapor pressures at the same temperature, each temperature scale is identified for the respective refrigerant.

The pressure gauges make is possible to perform the following checks and measurements. Refer to PRESSURE GAUGE USES .