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2.2.5.6
Checking reaction and taking chlorine dioxide sample
• let system run for some time; the production of chlorine dioxide results in slight yellow
discoloration which can be observed (with the help of a light) in the inspection window of the
reactor outlet.
• a sample should be taken from the main water line approx. one hour after reaction has taken
place
• examine water sample for surplus chlorine dioxide (colorimetric analysis of DPD method,
see ch. 5.3)
• change operating parameters of the system until surplus chlorine dioxide reaches desired level
IMPORTANT
Each adjustment of stroke length makes it necessary to properly calibrate (in accordance
with ch. 2.2.3) and readjust the ring initiators (in accordance with ch. 2.2.4). The stroke
length must not fall below 50 % otherwise the reliability of the monitoring system is
not ensured.
2.3
Commissioning system type CDKaxBxxxxxXxx
(w/o calibrating vessels)
Venting and running
of metering pumps is carried out analogous to the system type
CDKax
A
xxxxx
X
xx (see ch. 2.2). Graduated 500 ml cylinders are used for calibrating the
chemical pumps instead of built-in calibrating vessels.
A hose is attached to the venting port of each of the three-way chemical valves. Each hose is
connected to one of the enclosed bleeder bottles (500 ml PE bottle). The venting vessel should
be placed on the floor or on the corresponding safety tub.
DANGER
Collect each chemical in its own bleeder bottle. Do not exchange bottles. Do not
mix contents.
3
Shutting down chlorine dioxide system
When shutting down system (e.g. for servicing it), observe the safety instructions in section D.
3.1
Placing out of operation for a short period of time
If the chlorine dioxide system is to be placed out of operation for a short period of time, the
system can be simply switched off with the “start/stop” button. The power supply to the system
control or to a chlorine dioxide measuring point should not be interrupted.
3.2
Placing out of operation for a longer period of time
Chlorine dioxide is an unstable compound that breaks down over a prolonged period. If the
chlorine dioxide system is to be placed out of operation for a longer period of time (several days),
it is therefore recommended to flush the reactor with water.
• Shut down system by pressing the “STOP” button: Green LED 9 “Operation” goes out
• Open the configuration menu on the control display
• Set the start-up time parameter to minimum 30 minutes in the “Start-up” menu.
• Remove the intake lance from the chemical tank and place separately in a bucket filled with
water.
• Press “Start” button and set the stroke length of both metering pumps to 100%.
• Allow system to operate until the pump heads, reactor and lines up to the metering valve are
completely filled with water (this prevents chlorine from flowing out from the reactor during
disassembly).
• Disconnect system from power supply.
• Refer to Ch. 7 for system maintenance
• Refer to Ch. 2 for resuming system operation
Commissioning / Shutting down chlorine dioxide system
Summary of Contents for Bello Zon CDKa 10000
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