QSG_ERD620_421.00_EN_01 / 2020-09-09
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FLOW RATE TEST
The purpose of the instrument is to generate a pressure ramp in a valve and detect a flow
event (ex: valve opening). A ramp down can also detect when a valve is closed. The instrument
will display the event pressures and compare them to reject levels. As an option the flow event
can be replaced by a dry contact event.
The ATEQ ERD620 can do direct or indirect measurements. In both cases, the flow meter can
work in vacuum (optional).
Measurement principle
When the fluid (gas) enters the device
1
, it moves through a calibrated flow tube
2
which
causes a drop in pressure. The pressure drop is measured by a differential pressure sensor
3
.
The pressure of the part under test
5
is measured by the sensor
4
.
1
Device
2
Calibrated flow tube
3
Differential pressure sensor
4
Pressure sensor
5
Part under test
Direct measurement
Once the part is filled, the device measures the flow rate through the part.
The test pressure is applied to the device
1
and then to the input of the part under test
2
.
1
Device
2
Part under test
