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Leak Detection
R-134a system leaks can be pinpointed by means
of an electronic leak detector or by bubble solution.
Electronic leak detectors for R-134a service are
currently available from several manufacturers. The
least expensive models are non-selective detectors
that will detect any type of emission or vapor
present, regardless of its chemical composition.
Some non-selective detectors designed for use
with R-12 may have a much lower sensitivity
when used with R-134a. However, newly designed
detectors with good R-134a sensitivity are now
available. Be sure to consult with the manufacturer
before selecting or using a non-selective detector
with R-134a.
Molecular Weight (g/mol)
Ozone Depletion Potential
Global Warming Potential
Refrigerant (wt% @ 77°F)
D - Refrigeration System
NAME
Formula
(ODP)
(GWP)
Boiling Point °F
Vapor Pressure (77°F)
Flammability
Solubility of Water in
Halogen-specific detectors use a specialized
sensor that allows detection of compounds
containing chlorine, fluorine, bromine, and iodine
without being activiated by other species. The
major advantage of this type of detector is a
reduction in the number of "nuisance alarms".
Halogen-specific detectors are generally more
expensive than non-selective detectors but feature
higher sensitivity.
R-134a properties
The properties of R-134a are very similar to those
of R12. The principal data for the two refrigerants
are shown in the chart below.
REFRIGERANTS
R-12
R-134a
Dichlorodifluoro-
1,1,1,2--Tetra-
methane
fluoromethane
CCI
F
CH
2
2
2
120.93
102.3
1
3.1
0.3
-21.6
-15.7
80 psig
82 psig
None
None
0.009
0.11
F-CF
3
0
33
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