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W3T331759 / WT.050.585.003.UE.IM.1014
MICRO/2000® AND DEOX/2000® MODULE
APPENDIX A
MICRO 2000 Reagents
List of Contents
MICRO/2000® Flow Block Theory of Operation
1
Preparation of Reagents - MICRO/2000®
2
Preparation of pH Buffer
2.1
Preparation of Potassium Iodide Solution
for MICRO/2000®
2.2
Preparation of Potassium Iodate
2.3
Refilling Reagent Reservoirs
3
Selection of Reagents
4
Residual Form
4.1
Chlorine dioxide and potassium permanganate
monitoring
4.1.1
Bromine residual monitoring
4.1.2
Chlorine residual monitoring
4.1.3
Free chlorine monitoring
4.1.4
Total chlorine monitoring
4.1.5
Interfering residuals
4.1.6
1
MICRO/2000® Flow Block Theory of Operation
The measurement of free chlorine is made directly at a buffered pH of 4 with
pH 4 buffer or pH of 5 or 6 with carbon dioxide. The measurement of total
chlorine is made by reacting the various chlorine species with potassium
iodide at the buffered pH, then measuring the resulting iodine concentration.
The analyser measuring process is as follows:
A continuous sample is delivered to the analyser. A flushing Y-strainer
divides the sample into two streams—the larger bypass stream continuously
flushes the Y-strainer and the smaller stream, about 500 ml/min, flows into
the analyser. Most of the flow into the analyser is again bypassed, but a
small portion (15 ml) is metered from this flow by a peristaltic metering
pump. The reagents, pH 4 buffer or carbon dioxide for the measurement of
free chlorine residual and potassium iodide solution with detergent for the
measurement of total chlorine residual, are also metered by the same pump.
The reagents are then mixed with the sample as the sample is pumped to
the analyser cell. A three-electrode amperometric “probe” is immersed in
the sample in the cell. A rotating impeller stirs the sample and maintains a
constant sample velocity across the electrode surfaces. It also agitates the
grit used to clean deposits from the electrodes, improving the stability of
calibration. The amperometric cell produces a signal (electrical current)
proportional to the oxidant (e.g., chlorine) concentration in the cell.
Содержание WALLACE & TIERNAN DEOX/2000
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