Liquistation CSF48
Endress+Hauser 7
Mode of operation with a
vacuum pump
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Sampling with a vacuum pump
Sampling takes place in four steps:
1. Blow clear
The hose valve is closed. The vacuum pump blows the suction line clear via the dosing system.
2. Intake
The "air manager" - a pneumatic control unit - switches the air path of the vacuum pump to
"intake". The sample is drawn into the dosing beaker under vacuum. The level of liquid reaches the
detectors of the dosing system.
3. Dose
The intake process is completed and pressure compensation takes place. Depending on the
position of the dosing tube (D), the excess sample liquid flows back to the sampling point.
4. Drain
The hose clamp is opened and the sample is drained into the sample bottle.
Dosing system with conductive sample sensor
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Conductive dosing system
1 Conductivity sensor 1 (common electrode)
2 Conductivity sensor 2 (safety electrode)
3 Conductivity sensor 3 (standard electrode)
4Insulation
5 Dosing beaker (plastic version with graduated scale or glass)
6 Graduated dosing tube, white and blue scale
Not shown since hidden: hose connection for vacuum pump --> graphic for "Capacitance dosing system"
Level detection principle
When the sample is drawn in, the sample level reaches conductivity sensors 1 and 3. The system thus
detects that the dosing beaker is filled and terminates the suction process.
If sensor 3 is heavily fouled or fails, conductivity sensor 2 switches to safety mode and turns off the
system. This patented sample detection method along with predictive maintenance information
prevent vacuum pump failure as a result of flooding.
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