Waltron AQUALERT Aqualyzer 3051, Instruction Manual, Page: 24 / 70

Introduction
23
Waltron User Manual
3051 Hardness Analyzer
Pinch Valve
Normally-closed pinch valve to pinch or open a silicon / viton tubing O.D. ⅜ in order to
close or open the drain of the colorimetric cell. The size and the material of the tubing is very
important; use only Waltron spare parts.
Mixing Pump
The sample is mixed with reagents with a membrane mixing pump. The liquid is pumped
from the lower part to the upper part of the colorimetric cell.
Flow direction (inlet / outlet) of the pump is indicated on it with the symbols Λ and V.
Sample Drain
The tubing for the sample drain maintains a constant level of few cm of liquid on the
colorimetric cell.
2.7
ELECTRONICS
The microprocessor and its PCB assembly are located in the electronic section. It provides to
control the entire analyzing system. It handles the analyzer operations, it collects all the
information and data coming from the different analyzer devices and it controls all the I/O
apparatus to dialogue with the user touchscreen interfaces and transfer data equipments. The
connections for the external terminal block are shown in Section 3.6.2.
Figure 2.8: Electronics box.
Pass-thru
Cable Glands
AC Power
Connections
(behind cover)
External
Terminal Block
Power Switch
Electronics
Enclosure