Description; General; How It Works - Siemens Wallace & Tiernan Chem-Ad VPP Instruction Manual

Chem-Ad VPP / VPP-E / VPP-DC
®

3. Description

3.1

General

®
The Chem-Ad VPP and the Chem-Ad
microprocessor-controlled peristaltic metering pumps with speed-
controlled drive for continuous dosage of liquid media.
®
In Chem-Ad VPP-DC, the motor is directly connected to 12 –
24 V DC (drive is not speed-controlled).
With a flexible configuration and control options, the peristaltic
metering pump is suitable for a wide range of applications.
3.2

How it works

The peristaltic metering pump is a rotating positive displacement
pump and is self-priming without valves and seals.
The pump hose is compressed while the medium is pumped by
spring-mounted pressure rollers. The rotating motion of the rotor
with the pressure rollers pumps the medium from the suction side
to the discharge side. There is an underpressure, which draws the
medium.
The flow rate depends on the speed of the pump rotor, the inside
diameter and elasticity of the hose, as well as the back pressure
and the viscosity of the medium. The peristaltic metering pump
runs with true speed control in a closed loop. The rotor speed is
maintained at the precise set speed (not in Chem-Ad
3.
Description
®
VPP-E are
®
VPP-DC).
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