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10 Technical data
Sampling principle
Sampling types
86
10
Technical data
10.1
Function and system design
Pump
hose
Medium
detection
The advantages of the Endress+Hauser system:
• Intelligent: the suction height is automatically detected and does not have to be configured
• Maintenance-free: ceramic membrane
Sampling takes place in three steps:
Rinse
• Rinsing the suction line: the sampling liquid is sucked in until the medium detection system is
triggered. Then the pump runs backwards and pushes the liquid back to the sampling point. The
rinsing process can be repeated up to three times.
• Sucking the sampling liquid: the sampling liquid is sucked from the sampling point to the sampler
and the sample volume is calculated electronically by adding the number of pump revolutions.
• Emptying the suction line: after sampling, the liquid left over in the suction line is pumped back
to the sampling point.
The timer function in the control system makes sampling at defined times possible. Depending on
the measured flow, samples can be taken in proportion with the quantity and flow.
Sampling can also be triggered by an external signal, for example in the event of limit value viola-
tion.
A hose pump is used to suck in and dose the
sampling liquid. The pump hose is periodi-
cally twisted by rollers running along the
Pump
circumference of the hose, thereby generat-
rotor
ing a pump effect. The medium detection
system controls the electronic volume cal-
culation.
The medium detection system is a new sys-
tem developed by Endress+Hauser. A pres-
sure sensor is at the heart of the system. The
pressure sensor detects the difference
Rotor
roller
between a full and empty pump line.
Suck
Liquiport 2000 Ex
Purge
Endress+Hauser
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