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L L e e a a k k D D e e t t e e c c t t i i o o n n
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
Boiling Point °F
Vapor Pressure (77°F)
Solubility of Water in
Refrigerant (wt% @ 77°F)
Dichlorodifluoro-
NAME
Formula
(ODP)
(GWP)
Flammability
R R e e f f r r i i g g e e r r a a t t i i o o n n S S y y s s t t e e m m
Halogen-specific detectors use a specialized
sensor that allows detection of compounds
containing chlorine, fluorine, bromine, and iodine
without being activated 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 R - - 1 1 3 3 4 4 a a p p r r o o p p e e r r t t i i e e s s
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
1,1,1,2--Tetra-
methane
fluoromethane
CCI
F
CH
2
2
120.93
1
3.1
-21.6
80 psig
None
0.009
4-15
R-134a
F-CF
2
3
102.3
0
0.3
-15.7
82 psig
None
0.11
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