ABB Aztec 600 - Appendix C - Principle of Operation; General Operation Overview

Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers Appendix C – Principle of Operation
IM/AZT6CR–EN Rev. J 85
Appendix C – Principle of Operation
C.1 General Operation
A single piston pump is used for all hydraulic functions. This is
driven by a stepper motor, ensuring precise volumes are drawn
in. The piston provides the added benefit of physically wiping
the optical cell when sample and reagents are introduced and
expelled; resulting in an automatic cleaning process.
This cleaning process reduces maintenance and increases the
accuracy and repeatability of the analyzer.
The piston pump design enables the analyzer to make use of a
unique patented air mixing system. The final upward movement
of the piston coincides with the opening of the air valve, drawing
air vigorously through the entry point of the optical cell and so
achieving full chemical mixing.
Fig. C.1 Flow Schematic
Piston Assembly Di-ionised Water Standard ReagentsSamples
Valve Manifold Block
Air
R1
R2
S1
S2
S3
STD
DI
Waste
W
R3
To
Atmosphere