Preamble
UM-18400E-U ATEQ F580 User manual Page 7/168
3. THE MAIN TYPES OF MEASUREMENTS
There exist three measurement methods:
Direct measurement, indirect measurement and sealed component measurement.
These three methods apply to both measurements taken under pressurised or vacuum
conditions.
The configuration is established in function of the application and must be carried out
prior to the use of the instrument.
3.1. DIRECT/PRESSURE DROP MEASUREMENT
After filling the test and reference parts with the required level of pressure, the
instrument measures the differential pressure between the two volumes, which, are
separated by the equalisation valve.
At the end of a cycle, the ATEQ empties the components via the dump valve.
3.2. INDIRECT/ PRESSURE RISE MEASUREMENT
The test part is placed in a sealed bell to which the instrument is pneumatically connected to
the bell. The part is externally pressurised (with up to 20 MPa, 200 bar), and the bell is lightly
pressurised. In the event of a part leakage, the pressure in the bell will rise. This method
allows the testing of certain parts at high pressure levels whilst avoiding the associated
constraints. The instrument only controls and measures the pressure in the bell. In the event
of a large leak, an electronic monitoring of the pressure in the bell will switch the instrument to
safety.
3.3. S
EALED COMPONENT MEASUREMENT
INTERNAL VOLUME
FILL
VALVE
REGULATOR
DUMP VALVE
ELECTRONIC
PRESSURE SWITCH
REFERENCE PART
PLUG
BELL
PART
SENSOR
This test is for hermetically
sealed parts, which may not be
filled. They are placed under a
bell which is pressurised.
The first and the third measurements may be carried out in comparison with a
reference, without reference or in central naught.
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