Educational pressure–temperature (PT) reference only. Verify readings against a manufacturer chart on site before charging or adjusting a system. Not affiliated with Copeland, Emerson, Danfoss, Chemours, Honeywell, Arkema, or National Refrigerants.
What the app does
Pick a refrigerant, enter gauge pressure or saturation temperature, and read the matching value. Works offline. No account.
How to use
- Tap the refrigerant bar to search, pick favorites, or open recent refrigerants.
- Tap Pressure or Temperature, then use the keypad. A selected field rewrites on the next digit or backspace.
- Switch PSIG / bar and °F / °C on the home screen.
- For blends with glide, choose Bubble, Mid, or Dew on the home screen (ⓘ explains each). Pure refrigerants hide this control.
- Copy writes a one-line summary to the clipboard.
- Settings: appearance (dark/light), keep screen on, and whether to clear readings when changing refrigerant.
Table range
Each refrigerant has a finite saturation table. Values outside that range show as out of range — the app does not extrapolate. The active table range appears under the pressure and temperature fields.
R-744 (CO₂) stops near 85 °F because carbon dioxide’s critical temperature is about 87.8 °F. Above that, a simple liquid–vapor PT chart does not apply (transcritical operation).
Zeotropic blends
Blends with glide (for example R-407C, R-448A, R-449A, R-454B, R-452B) show Bubble / Mid / Dew. Default is Mid (average of bubble and dew) for a quick field estimate. Bubble is often used toward the liquid / evaporator side; Dew toward the vapor / condenser side. Pure refrigerants and near-azeotropes do not show the control.
Vacuum (below atmosphere)
When gauge pressure is below zero PSIG, the app also shows inches of mercury vacuum (inHg vac), the common US wall-chart form. Entry remains signed PSIG (negative).
Send feedback
Use Settings → Send feedback for a one-way in-app message. We read feedback when we can and cannot reply inside the app. Do not include personal job-site details unless necessary.