Endress+Hauser ASP Station 2000 Peristaltik Betriebsanleitung Seite 131

ASP station 2000 peristaltic
Endress+Hauser
10 Technical data
10.1 Function and system design
10.1.1 Sampling principle
A hose pump is used to suck in and dose the sampling liquid. The pump hose is periodically twisted
by rollers running along the circumference of the hose, thereby generating a pump effect. The
medium detection system controls the electronic volume calculation.
The medium detection system is a new system developed by Endress+Hauser. A pressure sensor is
at the heart of the system. The pressure sensor detects the difference between a full and empty
pump line.
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
Pump
hose
Medium
detection
Fig. 65: How the hose pump works
Sampling takes place in three steps:
Rinse
Fig. 66: Sampling steps
• 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 totalising the pump rotations.
• Emptying the suction line: after sampling, the liquid left over in the suction line is pumped back
to the sampling point.
Pump
rotor
Rotor
roller
Suck
Technical data
Purge
131