R507A pressure temperature chart (PT)
R507A saturation pressure vs temperature (PT chart): CoolProp-generated bubble and dew reference tables in kPa(a), bar(a), and psi(a), with notes on why they often overlap.
An R507A pressure temperature chart (PT chart) is a saturation lookup for R507A in the two-phase region. R507A is a blend that is often treated as (near-)azeotropic, which means bubble and dew endpoints can be very close. We still show both columns so you can compare conventions across sources.
Bubble vs dew (why the two columns may match)
For many zeotropic blends, bubble and dew differ due to temperature glide. For azeotropic (or near-azeotropic) behavior, the difference can be very small, and the two PT curves can nearly overlap.
Learn more: Bubble vs Dew (Temperature Glide) and Zeotropic vs Azeotropic.
Pressure basis: absolute vs gauge
The tables below use absolute pressure (kPa(a), bar(a), psi(a)). Many field gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Pabs = Pgauge + Patm
Learn more: Gauge vs absolute pressure (psig vs psia).
R507A saturation pressure vs temperature (reference tables)
Generated using CoolProp (the same property engine used by FluidTool). We provide bubble (Q=0) and dew (Q=1) endpoints. This page is educational and does not provide diagnostic target pressures.
| T ( deg C) | T ( deg F) | Psat bubble (kPa(a)) | Psat dew (kPa(a)) | Bubble (bar(a)) | Dew (bar(a)) | Bubble (psi(a)) | Dew (psi(a)) |
|---|---|---|---|---|---|---|---|
| -20 | -4 | 314.5 | 314.4 | 3.145 | 3.144 | 45.6 | 45.6 |
| -10 | 14 | 449.5 | 449.3 | 4.495 | 4.493 | 65.2 | 65.2 |
| 0 | 32 | 624.4 | 624.0 | 6.244 | 6.240 | 90.6 | 90.5 |
| 10 | 50 | 846.0 | 845.4 | 8.460 | 8.454 | 122.7 | 122.6 |
| 20 | 68 | 1121.8 | 1120.9 | 11.218 | 11.209 | 162.7 | 162.6 |
| 30 | 86 | 1460.0 | 1458.7 | 14.600 | 14.587 | 211.7 | 211.6 |
| 40 | 104 | 1869.5 | 1867.9 | 18.695 | 18.679 | 271.1 | 270.9 |
| 50 | 122 | 2361.2 | 2359.2 | 23.612 | 23.592 | 342.5 | 342.2 |
| 60 | 140 | 2948.9 | 2946.9 | 29.489 | 29.469 | 427.7 | 427.4 |
| 70 | 158 | 3656.1 | 3655.8 | 36.561 | 36.558 | 530.3 | 530.2 |
How to verify in FluidTool
- Open FluidTool with R507A selected: /?fluid=R507A
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 to reproduce the bubble column, or Q=1 to reproduce the dew column.
Related
- R507A data sheet: basic identifiers and thermodynamic context.
- R404A PT chart: a blend where bubble and dew can differ.
- Refrigerant PT chart: how PT charts are used and misused in practice.
- Back to Wiki
- Open the tool
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