Electro-Chemical Devices (ECD) CA6 Hardness Analyzer - Manual (Page 21)

Mix and wait functions time is programmed in order to eliminate bubbles and allow
suspensions to settle ...
First measurement
Reference function Measures the light intensity for the base reference value, in order to
start from a fixed reference point and eliminate interfering factors
(sample turbidity, color...).
Addition of color reagent(s)
Add reag function Depending on the method one or more reagents may be added for
the color development.
Mixing and wait
Mix and wait functions The mixing pump is activated and liquid is pumped from the lower
part to the upper part of the colorimetric cell; mixing the sample and
the reagent(s). The waiting time is programmed to provide adequate
time to complete the colorimetric reaction.
Reading, absorbance and concentration calculation
Absorbance and Calculation Reading of the light intensity after the colorimetric reaction,
calculation of the absorbance and of the concentration.
Drain, conditioning, rinsing, sampling
Drain, rinse and sample functions Drain and rinse of the hydraulic lines and the colorimetric cell.
Waiting time (analysis frequency)
Wait function The wait function allows the frequency of the analysis to set.
2.3.2 Settings
Analysis cycle – Extra cycle (second level password, administration)
These menus list the sequence of programmable operations run by the analyzer. See actual program
sequences in Section 11 at the rear of the manual.
Both the Analysis Cycle and the Extra Cycle menus have 30 programmable steps. Each step has an
operation and a time associated with it. The time of the operation is in seconds and the maximum
programmable value is 900 seconds. See the list of operations on the following pages. The operations of
absorbance, calculation, calibration, validation, blank and print require only few seconds, 1-2 seconds
each.
The modular design and easily programmed operations make it possible to automate most any
colorimetric laboratory method with up to 4 reagents.
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