30
W3T331759 / WT.050.585.003.UE.IM.1014
MICRO/2000® AND DEOX/2000® MODULE
Impeller
3 Electrode Cell
Peristaltic
Pump
Buffer Potassium
Reservoir
Iodide Reservoir
5 litre
5 litre
(1 Gallon US)
(1 Gallon US)
(Total Residual)
Internal Bypass
Calibration
Sample Flow Control
Valve
Shut Off
Valve
3-Way
Valve
Flushing
Y-Strainer
Drain
Chamber
to Waste
Relief Valve Set at 2 bar (30 PSI)
Priming
Port
4-19 l/m
(1-5
US GPM)
Manual
Bypass Valve
Sample Pump
(For wastewater applications)
Water Sample
Sample Line
Dosing
(If Used)
Figure 3.1 Flow Diagram
3.2.1.2 DEOX/2000® flow block theory of operation
The DEOX/2000® Analyser gives a continuous on-line determination of
SO
2
residuals by metering a predetermined amount of Potassium Iodate,
along with pH4 buffer and potassium iodide, into a metered quantity of
process water sample. This constant level addition of iodine is termed
the “Iodine Bias”. The DEOX/2000® analyser detects this iodine level
as a proportional electric current (µA) in the same manner it does with
chlorine. Once in operation, change in current indicates the presence of a
chlorine or SO
2
residual in the process water—depending on whether the
change is an increase or decrease in iodine concentration, respectively.
Iodine reacts with SO
2
in the same manner that chlorine reacts with SO
2
,
therefore, the amount of iodine consumed represents the amount of SO
2
residual in the water. Conversely, if there is an increase in the iodine
concentration (above the bias concentration), a chlorine residual is
indicated and can be accurately determined.
Summary of Contents for WALLACE & TIERNAN DEOX/2000
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