Process analyzers with touchscreen for alkalinity (+m-value) and for carbonate hardness measurement

The WATERLINE +m10/+20/CH10/CH20 process analyzers consist of a control unit with touchscreen and an analysis unit with measuring chamber, valve, dosing pumps and all required tube connections.

Working principle of the analyzer is the titration of a water sample with hydrochloric acid to determine the KS4,3 value(+m-value). A second reagent (indicator) is dosed for the photometric detection of the color change. A control unit with a microprocessor takes care for the automatic procedure of analysis.

Applications for the new analyzers are the survey and monitoring of water treatment plants and the control of decabonisation plants. The analysis results can be used for the monitoring/control of a supervised process.

  • good cost-benefit relationship,
  • high resolution,
  • adjustable limit and alarm value,
  • programmable analog recorder output (0/4-20 mA),
  • adjustable break time between two analysis (1 - 99 min),
  • external start/stop of an analysis possible,
  • multi range power supply (110 – 230 Volt, 50 – 60 Hz) for variable use
  • automatic operation incl. self test and drift compensation, no external calibration
  • polycarbonate wall cabinet included
Description Microprocessor-controlled analyzer for the determination of the +m-value or of Carbonate hardness in water
Typical Applications Monitoring of strong and weak bases dissolved in water. Analysis of free carbon dioxide in water
Method of working Acid/base titration of KS4,3 (m-value) using hydrochloric acid titer and photometric determination of the endpoint
Measuring Range +m10 = 0,1 – 3,5 mmol/l
CH10 = 0,3 – 10,0 °dH
+m20 = 0,2 – 7,0 mmol/l
CH20 = 0,6 – 20,0 °dH
Resolution 0,03 mmol/l
CH10 = 0,09 °dH
0,06 mmol/l
CH20 = 0,18 °dH
Accuracy 5 % of end value
Reproducibility 3 % of end value
Zero-point Stability automatic adjustment
Number of Samples 1
Operating Pressure 0,1 -10 bar
Temperature5 - 30 °C
Sample Volume25 ml per analysis (excluding cuvette rinsing)
Sample Conditionclear, with particles < 0.5 g/l ; < 50 µm
Drainpressure free into open drain
Number 2 (Titer, Indicator) 2 (Titer,Indicator)
Storage Temperature0 – 30°C 0 – 30°C
Usage/analysis0,5 ml for 1 mmol (Titer)0,25 ml for 1 mmol (Titer)
(approx.)0,17 ml for 1 °dH (Titer)
0,07 ml Indicator
0,08 ml for 1 °dH (Titer)
Reagent volume500 ml/250 ml 500 ml/250 ml
Suitable for analysis 1000 (at 1 mmol/l +m-value)
2940 (at 1 °dH CH)
2000 (at 1 mmol/l +m-value)
5880 (bei 1 °dH CH)
Cycle (approx.) 3 - 10 min (depends of m-value/CH).
Sample interval 1 min - 99 min