Pressure Gauge, Tests And Measurements: Notes
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Indicators on pressure gauge
- Temperature scale for refrigerant R134a CF3-CH2F or CH2F-CF3.
- Pressure scale
NOTE:
Pressure is measured in different units: 1 MPa (mega Pascal) corresponds to 10 bar positive pressure or 145 psi. 1 bar absolute pressure corresponds to 0 bar positive pressure and thus to the ambient pressure (atmospheric pressure).
The pressure gauge may have one or more temperature scales next to the pressure scale. The R134a 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.