Specifications

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Ŷ A special, fluorescent additive is injected into the refrigerant circuit – either via the A/C service unit or manually. Some
new drier models are already fitted in the factory with such additives.
Ŷ When the A/C components are illuminated with a UV lamp and viewed through yellow UV protection goggles, the leak
appears brightly lit up. Visibility is ensured even where oil-covered engines are concerned and even at some distance.
Ŷ Unlike the forming gas method, UV leak detection is also suitable for tracing ultra-fine leaks. Where vibration leaks are
concerned it is the only method available.
Ŷ UV leak detection is already approved for use on R 1234yf systems. Matching leak detection
additives are ready to be shipped.
UV LEAK DETECTION
Ŷ Finding very small leaks is no problem for electronic
leak detection systems. In some sections of the
A/C system it is difficult though to apply the probe
correctly, or at least very time-consuming.
ELECTRONIC LEAK DETECTION
Ŷ Looking for a leak with lather, the so-called “bubble test”, belongs to the
oldest methods of leak detection. It has become almost insignificant, however,
as it is impossible to find very small leaks using this method.
SIMPLE BUBBLE TEST
Ŷ Fully automatic with advanced
A/C service units
VACUUM CHECK
Ŷ This method involves the production of
positive pressure through nitrogen or
negative pressure through vacuum by
the A/C service unit.
Ŷ Leak detection through differential
pressure is mainly suitable for the initial
testing of strongly leaking or even empty
systems. It only indicates that the system
is leaking – not where the leak is.
Ŷ Testing is only possible with A/C service
units that automatically stop when it is
impossible to generate vacuum
(e.g. all WAECO ASC service units). If the
process continues without fault warning, you can
be certain that the system has no leak and may be
charged with refrigerant. The requirements of the Chemicals
Climate Protection Ordinance are met.
Ŷ The WAECO ASC 2000RPA allows application of both methods
(positive pressure through nitrogen or negative pressure through vacuum).
NITROGEN
Ŷ Forming gas consists of 95% nitrogen and 5% hydrogen. The operating principle is similar to that of electronic
leak detection. The difference is that the operator has to fill the system with test gas when the refrigerant has
been removed.
Ŷ The drawback of this method is the length of time required (after 15 minutes the hydrogen has almost completely
diffused and must be replaced).
Ŷ Another disadvantage is the fact that testing takes place when the system is not operating. “Vibration leaks”
which occur while the engine is running can therefore not be detected. (The system needs refrigerant to operate,
but it cannot be recharged yet because of the leak!) Moreover, leak detection with forming gas requires clean and
constant ambient conditions (for example no draughts in the workshop).
TRACER OR FORMING GAS
LEAK DETECTION:
SIX METHODS TO TRACE LEAKS
Leak detection Leak detection