Preamble
UM-22100H-U User manual ATEQ D520 Page 7/122
3. THE DIFFERENT MEASUREMENT PRINCIPLES
There exists two measurement principles, they are: direct measurement and the indirect
measurement (also known as with recovery or under bell).
The instrument can work in depressurisation (optional) both in direct and indirect
measurement.
3.1. DIRECT MEASUREMENT
Test part
Air pressure
supply
Absolute
pressure
sensor
Calibrated flow tube
Regulator
Atmosphere
Differential
pressure sensor
Flow
Dp
As shown in the diagram above the test pressure is applied directly to the test part input
after having flowed through the calibrated flow tube.
Once the test part is filled, the ATEQ D520 measures the drop in pressure at the
extremities of the calibrated flow tube with a differential sensor.
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