R245fa pressure temperature chart (PT)
An R245fa pressure temperature chart (PT chart) is a saturation lookup for R245fa: it relates temperature and saturation pressure when liquid and vapor coexist in equilibrium. This is useful for thermodynamic interpretation, but it is not a universal “normal running pressure” diagnostic chart.
Pressure basis: absolute vs gauge
The table below is absolute pressure (kPa(a), bar(a), psi(a)). Many gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Learn more: Gauge vs absolute pressure (psig vs psia).
Safety note
Refrigerants have safety classifications (toxicity/flammability) and their use is governed by codes and local regulations. This page is educational and provides property reference data only — always follow OEM procedures and applicable safety requirements.
R245fa saturation pressure vs temperature (reference table)
Generated using CoolProp (the same property engine used by FluidTool) at Q=0 saturation. Values are rounded for readability.
| T (°C) | T (°F) | Psat (kPa(a)) | Psat (bar(a)) | Psat (psi(a)) |
|---|---|---|---|---|
| -20 | -4 | 19.6 | 0.196 | 2.8 |
| -10 | 14 | 33.1 | 0.331 | 4.8 |
| 0 | 32 | 53.3 | 0.533 | 7.7 |
| 10 | 50 | 82.4 | 0.824 | 12.0 |
| 20 | 68 | 123.1 | 1.231 | 17.8 |
| 30 | 86 | 178.1 | 1.781 | 25.8 |
| 40 | 104 | 250.6 | 2.506 | 36.4 |
| 50 | 122 | 344.2 | 3.442 | 49.9 |
| 60 | 140 | 462.5 | 4.625 | 67.1 |
| 70 | 158 | 609.3 | 6.093 | 88.4 |
How to verify any row in FluidTool
- Open FluidTool with R245fa selected: /?fluid=R245fa
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
Related
- R245fa data sheet: basic identifiers and thermodynamic context.
- Refrigerant PT chart: what Tsat(P)/Psat(T) means and common pitfalls.
- Superheat & Subcooling: interpret measured line temperature vs saturation temperature.