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W3T331759 / WT.050.585.003.UE.IM.1014
MICRO/2000® AND DEOX/2000® MODULE
INTRODUCTION
The MICRO/2000® and DEOX/2000® Residual Analyser utilises the same
robust measurement system with different set of chemical reagents to cover
the full range of analytical measurements. The unit consists of a peristaltic
pump, which delivers sample and reagents, a measuring cell and probe. The
system is designed to continually measure the level of free or total
chlorine residual present in a flow of water and, by control of the chlorine
dosage rate, maintain a predetermined chlorine residual level in the treated
water. The MICRO/2000® and DEOX/2000® can also be used to control
levels of chlorine dioxide or potassium permanganate in a flow of water.
In a MICRO/2000® configuration, the peristaltic pump ensures a consistent
flow of sample water to the cell where the residual is measured. Where
required for pH buffering and/or total residual measurement, the pump also
delivers liquid reagents in fixed proportion to the sample. Potassium iodide
liquid reagent must be added to the analyser sample for the measurement
of total chlorine residual and acetate buffer to ensure that the sample pH
is maintained at pH 4. See Appendix A for further information on the
reagents. The system can be used for residuals in potable water, primary
or secondary wastewater or cooling water
In a DEOX/2000® system it operates as a centre zero analyser capable
of measuring oxidants (Chlorine and Ozone) and reductants (Sulphur
Dioxide). Potassium Iodide and Potassium Iodate are mixed with Acetic
acid to form Iodine in a mixing coil. This is then injected into the sample
stream and subsequently measured as a reduction current by the probe.
The presence of oxidant in the sample stream causes excess Potassium
Iodide to be oxidised to Iodine resulting in an increase in the measured
reduction current, whilst the presence of a reductant in the sample stream
results in the removal of Iodine and hence a reduction in the measured
current. Simply, changes above or below the measured Iodine baseline
enable the unit to detect both oxidants and reductants. See Appendix B
for further information on the reagents. The system can be used for all
dechlorination applications.
This manual has been produced to enable the user to obtain maximum service
from the equipment and comprises installation, operation, maintenance and
spare parts information. Minor changes may be made to the equipment
that are not immediately reflected in the manual - if such a change appears
to have been made, contact Evoqua Water Technologies for information.
Our guarantee is conditional upon the equipment being used in accordance
with the instructions herein and we therefore recommend that they be read
and fully understood before the equipment is placed in service.
Evoqua Water Technologies
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