| As vapour and liquid, the refrigerant is as colourless as water, and as gas it is invisible. Only the boundary layer between gas and liquid is visible (fluid level in the standpipe of the filling cylinder or bubbles in an inspection glass). In an inspection glass, the liquid of the refrigerant R134a may appear coloured (milky). This opacity arises from a partially dissolved refrigerant oil and does not indicate an error. |
|
|
|
