Preamble
UM-23100B-U User manual ATEQ F CLASS Page 7/90
4. THE THREE TYPES OF TEST
4.1. TEST WITH REFERENCE
TEST PART
SENSOR
REFERENCE
PART
Measurement of a pressure variation
between a test part and a reference part.
The ideal measurement conditions are:
part and reference part identical and
identical ATEQ connections to both parts
(identical lengths, diameters, and type of
pipes). A measurement taken with a
reference part saves time because the
pressure equalisation is more rapid. It is
valid for parts which cannot be deformed
and which mimic thermal and mechanical
effects.
4.2. TEST WITHOUT REFERENCE
TEST PART
SENSOR
CONNECTOR
Measurement of a variation in pressure
between a test part and a sealing
connector on the reference side. A test
without reference is not recommended
unless parts with very small volumes are
being tested. It is preferable always to
have a certain volume on the reference
side.
4.3. T
EST WITH CENTRAL ZERO
TEST PART
SENSOR
TEST PART
It is possible to test two parts at the same
time. One part is connected to the test
side and the other to the reference side.
The differential sensor measures the drop
in pressure in one part in relation to the
other. This method may be used when
the number of bad parts is very low
(generally less than 1%). The probability
of having two bad parts at the same time
is very low. This method is also used for
deformable parts and parts with a
constant temperature which is different
from the ambient temperature. The
central zero test offers a considerable
time gain (two parts tested
simultaneously).
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