Sheet #673u – Definition, characteristics and measurement principles
Version 1.04a User guide ATEQ 6th series Page 4/7
3.1.2. Three types of leak test
3.1.2. 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 equalization is more
rapid. It is valid for parts which cannot be
deformed and which mimic thermal and
mechanical effects.
3.1.2. 2) Test without reference
TEST PART
SE NS OR
CAP
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.
3.1.2. 3) Test 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
tests offer a considerable time gain (two parts
tested simultaneously).
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