CPS TEMP-SEEKER TM360 Instrukcja obsługi - Strona 11
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Experience has shown that accurate temperature readings can be affected by several
factors. Listed below are some of the conditions you may encounter when performing
temperature drop tests.
The pressure that you apply to a temperature probe can affect the reading by as much
as 20°F (-6°C). Try to be consistent when using touch probes, because if you apply
light pressure on the first temp reading and heavy pressure on the second reading
your results may not be accurate.
Air conditioning lines coated with dirt or paint need to be 16 scraped cleaned where
the probe will make contact. Several manufactures use epoxy black paint on condens-
ers and liquid lines that can affect your readings by as much as 30° F (-1°C).
Limited contact area can be a problem if the temperature probe tip is too large. Some
vehicles use a very short evaporator outlet pipe between the evaporator case and the
accumulator nut. In some cases only 3/16 of an inch is available for the probe to make
contact. Taking readings on flange nuts will skew the actual temperature by over 20° F
(-6°C).
Gaining access to the outlet side of both orifice tubes and thermal expansion valves
can be difficult on some applications. Some General Motors and Ford light truck appli-
cations place the outlet tip of the orifice tube just inside the evaporator case. You may
gain access to the pipe by cutting a small section of the evaporator case away with a
hot knife or vibratory cutting tool. After completing the repair job, seal the area with
HVAC Permagum or insulation tape and reinstall the section of the case that was cut
away using plastic welding, if possible.
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