Sheet # 680f – Leak programs parameters
Version 1.04a User guide ATEQ 6th series Page 3/9
2. PARAMETERS DEFINITION
2.1. COUPLING TIME
Coupling times A and B are the 1
st
timers of the cycle.
If there is no automatic connector, coupling time A is a part of the cycle.
If an instrument is fitted with an automatic connector, coupling time A delays the pressurization
of the test part by allowing the activation of a first cycle connector at the test start. Coupling time
B allows the activation of a second automatic connector.
2.2.
FILL TIME
This is the time allowed for the pressurization of the part to be tested. It must not be too long
(waste of time) or too short (the pressure in the component is at risk of not being sufficient due
to drops in pressure caused by temperature changes).
To determine the appropriate fill time, it is necessary to set the Fill Time in order to make it
Too Long (TLFT), then to shorten it until a drop in pressure occurs due to thermal effects.
Determine the TTLR by using the following formula:
4
mbarinpressurefill xcminvolumeTLFT
3
9 Carry out a cycle. When the instrument switches to the stabilization period, the pressure
must remain stable.
9 A pressure drop (since there will be no fall in pressure due to thermal effects) signals the
presence of a large leak; check the test part and the pneumatic assembly components, then
start again.
9 If the pressure remains stable, the part does not contain a large leak and the fill time is too
long. Shorten it progressively by carrying out cycles until a drop in pressure is noticeable.
9 As soon as a fall in pressure due to thermal effects appears, the fill time has become too
short. Increase it slightly.
2.3.
STABILIZATION TIME
9 This time is used to equalize the pressure between the TEST and REFERENCE parts.
Two phenomena may interfere with the equalization:
Different tubing
9 The first phenomenon that may appear is a pressure variation between the components,
caused by thermal effects. In fact, if the connection tubes are different (length or diameter)
the target pressure will be reached faster in the part with the most favorable setup. If the
instrument switches to test too early, the instrument will indicate the presence of a large
leak.
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