Extended refrigerant testing:
in accordance with the current AHRI 700 standard ensure high measurement accuracy:
- composition (by gas chromatography) – the test is performed to exclude elevated admixtures and to confirm the appropriate percentage of individual refrigerant components.
- moisture content (by the coulometric method) – the amount of moisture permissible according to the standard
in the refrigerant is 10 ppm. Too high a water content in the refrigerant can lead to ice plugs in the refrigeration system.
- Acidity (by alkacimetric titration) – the test involves determining the acid content of the refrigerant in terms of hydrochloric acid (HCl). Acidification of the refrigerant can be caused by burning the compressor.
- Solid and high-boiling residues (evaporation method) – high-boiling residues – oils, solid residues – metals and other impurities. Proper operation of the refrigeration system is ensured, among other things, by the right (adapted to the size of the system) amount of refrigerant, and too much oil in the circuit reduces the efficiency of the system.
- The presence of chlorides (by the precipitation method)-a refrigerant with correct parameters should not contain chlorides, so we test not the chloride content, but their presence.
- content of non-condensable gases (by gas chromatography) – the test involves determining the content of such gases as oxygen, nitrogen, carbon dioxide, argon and carbon monoxide.
Compressor oil testing:
- moisture content (by the coulometric method) – the acceptable value depends on the purpose of the oil. The presence of water in amounts greater than acceptable may indicate that water is entering the oil system from other circuits. Exceeding the moisture content limit causes oil degradation.
- acid number (by potentiometric titration) – acidification of oil is the result of oxidation of its less resistant components, in addition, some oils contain additives of an acidic nature, as a result of the decomposition of which the acid number is reduced. Excessive acidity leads to oil degradation.
- Kinematic viscosity (by viscometric method).
- Determination of elemental content (by atomic emission spectroscopy).