Electro-Chemical Devices (ECD) CA6 Hardness Analyzer - Manual (Page 28)

2.4.7 Colorimetric Reaction Cell
The colorimetric reaction cell is made of Quartz glass with a diameter of 16 or 25 mm, depending on the
measured parameter. The cell is located inside a thermostatic block held in place with 2 thumb screws.
The block can be easily removed to allow the cleaning of the glass cell.
2.4.8 Sample Drain
Tubing for the sample drain maintains a constant level of few cm of liquid in the colorimetric cell.
2.4.9 Electronic Components
The microprocessor based controller and its PCB assembly are located in the electronic section. The
cover and touch screen interface have been removed to show the internal construction. The controller
handles all analyzer operations. It collects all the information and data coming from the different
analyzer devices and controls all I/O dialogue with the user touch screen interface and data transfer
equipment. Remove the cover to adjust the REFERENCE LED voltage. This adjustment should only be
made when a CLEAN reaction cell filled with deionized water reads below 8. Turn the potentiometer
clockwise to increase the REFERENCE value to 9.00 ± 05.
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