R600a (Isobutane) pressure temperature chart (PT)
R600a (Isobutane) saturation pressure vs temperature (PT chart): a CoolProp-generated reference table in kPa(a), bar(a), and psi(a), plus safe interpretation notes (not diagnostic targets).
An R600a pressure temperature chart (PT chart) is a saturation lookup for isobutane (R600a): 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 uses absolute pressure (kPa(a), bar(a), psi(a)). Many gauges display gauge pressure (relative to ambient). Converting requires local atmospheric pressure:
Pabs = Pgauge + Patm
Learn more: Gauge vs absolute pressure (psig vs psia).
Safety note
Isobutane (R600a) is a hydrocarbon refrigerant and is flammable. This page is educational and provides property reference data only -- always follow applicable codes, OEM procedures, and local safety requirements.
R600a 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 ( deg C) | T ( deg F) | Psat (kPa(a)) | Psat (bar(a)) | Psat (psi(a)) |
|---|---|---|---|---|
| -20 | -4 | 72.5 | 0.725 | 10.5 |
| -10 | 14 | 108.5 | 1.085 | 15.7 |
| 0 | 32 | 157.0 | 1.570 | 22.8 |
| 10 | 50 | 220.6 | 2.206 | 32.0 |
| 20 | 68 | 302.2 | 3.022 | 43.8 |
| 30 | 86 | 404.7 | 4.047 | 58.7 |
| 40 | 104 | 531.2 | 5.312 | 77.0 |
| 50 | 122 | 684.9 | 6.849 | 99.3 |
| 60 | 140 | 869.2 | 8.692 | 126.1 |
| 70 | 158 | 1087.5 | 10.875 | 157.7 |
How to verify any row in FluidTool
- Open FluidTool with isobutane selected: /?fluid=IsoButane
- Choose a Two-phase input pair (Temperature & Quality / T + Q).
- Set Q=0 and enter the temperature from the table to read Psat.
Related
- Isobutane (R600a) data sheet: 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.
- Back to Wiki
- Open the tool
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.
R717 (Ammonia) pressure temperature chart (PT)
R717 (Ammonia) saturation pressure vs temperature (PT chart): a CoolProp-generated reference table in kPa(a), bar(a), and psi(a), plus safe interpretation notes (not diagnostic targets).