GRUNDFOS ALLDOS Oxiperm C 164 Series Operation manual

1
Oxiperm®C 164
Fully-automatic Chlorine Dioxide
Generation System
164 -4000C, -6000C, -7500C,
-10000C
Operation and Service Manual
Please read the Operation Manual completely and retain for future reference!
Damages resulting from operating errors cancel the guarantee.
Other languages
http://net.grundfos.com/qr/i/96681360

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Oxiperm 164C 4-10 kg en
Imprint
Oxiperm®C 164
fully-automatic chlorine dioxide
generation system
164-4000C, -6000C, -7500C, -10000C
Operation and Service Manual
Issued by:
ALLDOS Eichler GmbH
Reetzstraße 85 • 76327 Pfinztal (Söllingen)
Postfach 1160 • 76317 Pfinztal
Tel. [phone] / Fax. [phone]
Subject to change.

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Oxiperm 164C 4-10 kg en
Installation data
NOTE Please fill in this form following commissioning. It will
help you and your Grundfos-Alldos servicing partner to
adjust the device during subsequent corrections.
Owner:
ALLDOS customer No.:
Contract No.:
Order No. of device:
Serial number of device:
Put into service on:
Location of device:
Used for:
Installation diagram

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Oxiperm 164C 4-10 kg en
Contents
Installation data ................................................................................................ 3
Installation diagram ......................................................................................... 3
1 General .................................................................................................... 7
1.1 Introduction................................................................................................ 7
1.2 Using this Document ................................................................................. 7
1.3 Guarantee ................................................................................................. 7
2 Safety Information .................................................................................. 8
2.1 Use of the System ..................................................................................... 8
2.2 Obligations of Owner................................................................................. 8
2.3 Avoidance of Danger ................................................................................ 8
3 Technical Data ........................................................................................ 9
3.1 General Data ............................................................................................. 9
3.1.1 Performance and Consumption Data ............................................ 9
3.1.2 Connection Data and Weights .................................................... 10
3.1.3 Dimensions .................................................................................. 10
3.2 Electrical Data ......................................................................................... 13
3.3 Delivery State .......................................................................................... 13
4 Fundamentals ........................................................................................14
4.1 Chlorine Dioxide for Water Treatment ..................................................... 14
4.1.1 Generation of Chlorine Dioxide ................................................... 14
4.2 Functional Sequence .............................................................................. 15
5 Design and Function .............................................................................16
5.1 System Design ........................................................................................ 16
5.2 Components ............................................................................................ 18
5.2.1 Suction Lines for the Chemicals .................................................. 18
5.2.2 Dosing Pump HCl/NaClO2 .......................................................... 18
5.2.3 Flowmeters .................................................................................. 19
5.2.4 Bypass Line ................................................................................. 19
5.2.5 Preliminary Dilution for Hydrochloric Acid .................................. 19
5.2.6 Reactor ........................................................................................ 19
5.2.7 Solution Tank for ClO2 ................................................................. 20
5.2.8 Overflow Unit for Solution Tank .................................................... 20
5.2.9 Suction for Solution Tank ............................................................. 20
5.2.10 Water Tank for Preliminary Dilution .............................................. 20
5.2.11 Purging Unit ................................................................................. 20
5.2.12 Options ......................................................................................... 21
5.3 Mode of Operation of System .................................................................. 22
6 Installation .............................................................................................24
6.1 Transport and Storage ............................................................................ 24
6.2 Unpacking ............................................................................................... 24
6.3 Installation Location ................................................................................ 24
6.4 Installation Diagrams .............................................................................. 25
6.4.1 Installation Diagram for Water Supply and
Connection of the Chemicals ...................................................... 25
6.4.2 Installation Diagram for Sampling of ClO2,
Suction and Overflow ................................................................... 26
6.5 Floor Mounting of
System Frame .......................................................................................... 27

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6.6 Hydraulic Connection ............................................................................. 28
6.6.1 Bypass Line ................................................................................. 28
6.6.2 Supply Line for Chemicals .......................................................... 28
6.6.3 Sampling Line for Chlorine Dioxide ............................................ 28
6.6.4 Discharge Line for Suction Injector for Solution Tank ................. 28
6.7 Electrical Connection .............................................................................. 29
6.7.1 Profibus/Ethernet
(Option) ........................................................................................ 32
6.7.2 RS232 / RS422 / 485 Interface ................................................... 33
7 Operation of Control Electronics..........................................................34
7.1 Program Structure ................................................................................... 34
7.2 Control and Display Elements ................................................................ 35
7.3 Automatic Mode ...................................................................................... 37
7.4 Manual Mode .......................................................................................... 37
7.5 Logbook .................................................................................................. 37
7.6 System Selection ..................................................................................... 38
7.6.1 System Type ................................................................................. 38
7.6.2 Operating Mode ........................................................................... 38
7.7 Basic Setting ........................................................................................... 39
7.7.1 Language..................................................................................... 39
7.7.2 Min. Contact Water ....................................................................... 39
7.7.3 Code Function ............................................................................. 39
7.7.4 Reset Function ............................................................................. 40
7.7.5 Date/Time ..................................................................................... 40
7.7.6 Bus Options .................................................................................. 42
7.7.7 Program Version .......................................................................... 42
7.7.8 Automatic start ................................................................................ 43
7.8 Service Mode .......................................................................................... 44
7.8.1 Venting of Bypass Water Line and Dosing Pumps for
NaClO2 / HCl and H2O ................................................................ 44
7.8.2 Setting Data ................................................................................. 45
7.8.3 Test Mode ..................................................................................... 46
7.8.4 Reactor Temperature ................................................................... 47
7.9 Local / Remote ........................................................................................ 47
8 Startup ...................................................................................................48
8.1 Selection of System and Operating Mode .............................................. 49
8.2 Checking of Limit Contacts of Flowmeters.............................................. 49
8.2.1 Limit Contacts for 164-4000 C ..................................................... 50
8.2.2 Limit Contacts for 164-6000 C ..................................................... 50
8.2.3 Limit Contacts for 164-7500 C ..................................................... 50
8.2.4 Limit Contacts for 164- 10000 C ................................................ 51
8.3 Start-up operation, filling reactor with water ........................................... 51
8.4 Filling of Water Tank ................................................................................ 52
8.5 Venting and Adjustment of the H2O Pump ............................................. 55
8.6 Venting and Adjustment of the Pump for HCl/NaClO2 ........................... 57
8.7 Venting and Adjustment of the Bypass line ............................................ 60
8.8 Venting the Line for the Suction Injector ................................................. 60
8.9 Filling the Overflow
System on the Solution Tank ................................................................... 61

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Oxiperm 164C 4-10 kg en
9 Operation of the System .......................................................................62
9.1 Auto / Manual .......................................................................................... 62
9.1.1 Automatic Mode ........................................................................... 62
9.1.2 Manual Mode ............................................................................... 64
9.2 Gauging of the Dosing Pump for HCl/NaClO2 ....................................... 65
9.2.1 Gauging of HCl ............................................................................ 66
9.2.2 Gauging of NaClO2 ..................................................................... 66
10 Alarms/Errors ........................................................................................67
10.1 Acknowledgment of an alarm ................................................................. 67
10.2 Faults ....................................................................................................... 68
10.3 Error Messages of Controller .................................................................. 69
10.4 Fuses/LEDs of Controller ........................................................................ 71
11 Maintenance .......................................................................................... 72
11.1 Maintenance of Dosing Pumps ............................................................... 72
11.1.1 Dismounting and Cleaning the Valves ........................................ 73
11.1.2 Dismounting the Diaphragm of the Dosing Pump ....................... 75
11.2 Maintenance of Valves of Reactor and Purging Line ............................. 77
11.3 Checking of Temperature Sensor ........................................................... 79
11.4 Maintenance of the Suction Injector ....................................................... 80
11.5 Maintenance of Valves on the Suction Pulsation Damper...................... 82
11.6 Maintenance of the Solution Tank for ClO2 ............................................ 83
12 Details on the Components .................................................................. 85
12.1 Water Unit ................................................................................................... 85
12.2 Solenoid Valves for Purging and Suction Injector ...................................... 86
12.3 Pump for Dilution Water ............................................................................. 86
12.4 Valves in Bypass Line................................................................................. 86
12.5 Pulsation Damper ....................................................................................... 87
12.6 Impeller Meter ............................................................................................. 88
12.7 Flow Limiter ............................................................................................. 88
12.8 Water Tank for Preliminary Dilution ......................................................... 89
12.9 Leakage Monitoring ................................................................................ 90
13 Spare Parts Sets ....................................................................................91
14 Current Setting Data ..............................................................................92
EC Conformity Declaration

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Oxiperm 164C 4-10 kg en
1 General
1.1 Introduction
This Operation and Service Manual contains all information for safe operation of
the described device.
Should you require further information, or should problems occur which are not
handled in sufficient depth in this document, please request the information directly
from Grundfos-Alldos.
1.2 Using this Document
❏Descriptions are written in normal continuous text.
❏Lists are identified by squares (❏), subdivisions by dashes (-).
❏Steps requiring operations are identified by bold dots (●), subdivisions by
smaller dots (•).
❏Cross-references are indicated by
italic letters and an arrow (➜).
❏The safety instructions WARNING , CAUTION, NOTE and
PACKAGING have the following meanings:
!
WARNING Danger of injuries and accidents!
CAUTION Danger of malfunctioning or damage to device!
NOTE Exceptional feature.
PACKAGING Retain packaging material, or expose of according to
local regulations.
1.3 Guarantee
A guarantee claim in the sense of our general conditions of sale and delivery can
only be recognized if
❏the device has been used according to the information in this Operation
Manual,
❏the device has not been opened or incorrectly handled in any manner,
❏repairs have only been carried out by authorized specialists,
❏only original spare parts have been used during repairs.
NOTE Interventions in the hardware or software cancel the
guarantee and liability.
Software remains the property of ALLDOS Eichler
GmbH. Reproduction is not permitted.

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2 Safety Information
2.1 Use of the System
Oxiperm®C 164 is used to generate a chlorine dioxide solution within the context
of the possible applications described in this manual.
!
WARNING Other applications are considered as non-approved,
and are not permissible. ALLDOS Eichler GmbH cannot
be held liable for any damage resulting from such use.
2.2 Obligations of Owner
The owner of the plant is responsible for
❏training of operating personnel and
❏implementation of regular maintenance.
2.3 Avoidance of Danger
!
WARNING Before starting up, it is essential that you read the
ALLDOS information document "Function and safety of
chlorination systems".
Danger of explosion!
The permissible temperature ranges for process water
and chemicals must not be violated!
Observe the safety information for the used chemicals!
Work on the system must only be carried out at
standstill and with the master switch switched off!
Do not open the device components! Cleaning,
maintenance and repairs must only be carried out by
specialists authorized by ALLDOS!
Purge the reactor when carrying out maintenance work
on it!

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3 Technical Data
3.1 General Data
3.1.1 Performance and
Consumption Data
NOTE An increase or decrease in the total system
performance is only possible within a range of approx.
+/-10% since certain limits are defined in the PLC
program for safety reasons.
If the generated quantity of ClO2 is too large, it is also
possible to shift the MAX contact down on the solution
tank in order to produce less ClO2.
Concentration of prepared solution
3 g/l
Permissible concentration of NaClO2 solution 24.5% w/w
Permissible concentration of HCl solution 33% w/w
Permissible ambient temperature +5 °C to +40 °C
Permissible process water temperature (bypass water) +2 °C to +40 °C
Permissible component temperature (chemicals) +5 °C to +30 °C
Storage temperature of system -5 °C to +50 °C
Storage temperature of chemicals +5 °C to +40 °C
Permissible relative humidity Max. 80%, no condensation
Materials
System frame PP
Screws, washers and nuts 1.4301
Reactor Gray PVC
Solution tank Gray PVC
Piping Gray PVC
Gaskets FPM / PTFE
System Op. pressure
Bypass Prelim. dilution Suction from Total
NaClO2/HCl H2O (with 3 g/l) for HCl solution tankwater quantity
(kg/h) (l/h) (l/h) (l/h) (l/h) (l/h) (l/h) (l/h) (bar)
164-4000C 4 1333 24 24 1150 140 1400 2690 4 - 5
164-6000C 6 2000 37 37 1720 215 1900 3835 4 - 5
164-7500C 7,5 2500 47 47 2150 265 2300 4715 4 - 5
164-10000C 10 3333 63 63 2860 355 3100 6315 4 - 5
Dilution water requirement for bypass systemConsumption of
components *
performance *
ClO2
generation

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3.1.3 Dimensions
P1 Process water connection (bypass, predilution for HCI)
P2 Connecting pipe for NaClO2
P3 Connecting pipe for HCI
P4 Extraction pipe for suction injector (solution container)
P5 Extraction pipe for ClO2
3.1.2 Connection Data and Weights
Max. backpressure System
System for suction injector weight
solution tank
(bar) (kg)
164-4000C 1,5 225
164-6000C 1,5 245
164-7500C 1,5 290
164-10000C 1,5 315
ClO2 solution
Connection for
25
25
Connection for
bypass water
(DN) (DN)
inlet line
32
32
Connection for
suction
solution tank
50
32
32
50 20
20
20
Connection for
HCl /NaClO2
line
(DN)
20
25
(DN)
25
25
25
ABCDEFGHKLMNO
164-4000C 1660 1800 1150 1600 804 280 900 282 180 780 100 150 260
164-6000C 1660 1800 1150 1600 804 280 900 282 180 780 100 150 260
164-7500C 1800 1800 1350 1740 1004 280 900 282 180 920 100 150 260
164-10000C 1800 1800 1350 1740 1004 280 900 282 180 920 100 150 260
P1 P2 P3 P4 P5
164-4000C DN 25 DN 20 DN 20 DN 25 DN 32
164-6000C DN 25 DN 20 DN 20 DN 25 DN 32
164-7500C DN 32 DN 20 DN 20 DN 25 DN 50
164-10000C DN 32 DN 20 DN 20 DN 25 DN 50
System
Total water
Bypass Bypass Bypass quantityat a
(at 2 g/l) (at 3 g/l) (at 3,3 g/l)concentration of 2 g/l
(l/h) (l/h) (l/h) (l/h)
164-4000C 1810 1150 1020 3400
164-6000C 2715 1720 1530 4900
164-7500C 3395 2150 1920 6000
164-10000C 4525 2860 2560 8000
Water required for bypass system

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Dimensions in mm.

12 V6.0
Oxiperm 164C 4-10 kg en

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Oxiperm 164C 4-10 kg en
3.2 Electrical Data
Power consumption Order No. Power consumption (VA)
164-4000C 550 VA
164-6000C 550VA
164-7500C 550 VA
164-10000C 900 VA
Max. permissible loading of
floating output contacts 250 V / 6 A, max. 550 VA
Max. permissible loading of
overflow contact on solution tank 115 V / 0.25A, max. 3 VA
Max. permissible line impedance C164
With 90 Watt bypass
(0.168 + j 0.168) Ohm (test according to EN 61000-3-11)
With 340 Watt bypass (0.059 + j 0.059) Ohm (test according to EN 61000-3-11)
Degree of protection IP 65 Electronics
IP 65 Dosing pumps
IP 65 Solenoid valve
IP 44 Bypass pump
IP 65 Flowmeter
3.3 Delivery State
The Oxiperm®C 164 compact chlorine dioxide system comprises:
❏The generation system, completely assembled and wired up on a PP
system frame, including dosing pump for HCl and NaClO2, water tank
for preliminary dilution of the hydrochloric acid, and solution tank for the
chlorine dioxide solution
❏Flow monitoring of hydrochloric acid, sodium chlorite, dilution water for
hydrochloric acid, and bypass water
❏Tank level monitor and empty signalling system for hydrochloric acid
and sodium chlorite
❏Chlorine dioxide reactor with temperature sensor
❏Bypass system with flowmeter and solenoid valve
❏Preliminary dilution of hydrochloric acid with flowmeter and impeller
meter
❏Solution tank with level monitoring, overflow, MAX, MIN, running dry
and tank suction
❏Control electronics, directly mounted on the system frame and wired up

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4 Fundamentals
4.1 Chlorine Dioxide for Water
Treatment
Properties of chlorine dioxide
❏Strong and fast oxidation and disinfection agent
❏Applications in the treatment of drinking, service, cooling and waste water
❏Chemically unstable compound
- Can explosively decompose into chlorine and oxygen when heated
- Must be generated on site as required since storage in cylinders is
not possible
➜
Observe notes on avoidance of danger in Section 2.3!
Advantages of chlorine dioxide compared to chlorine
❏Largely good to very good bactericidal, virucidal and sporicidal effects in
the complete pH range of drinking water (pH 6.5 - 9)
(the disinfecting effect of chlorine decreases with increasing pH value!)
❏No or reduced forming of trihalogen methanes
❏No generation of chloramines with ammonium or amino compounds
❏Highly reduced potential for generation of organic halogen compounds of
high molecular weight
❏Good stability in water
- Long bactericidal and bacteriostatic protection in the water network
4.1.1 Generation of Chlorine
Dioxide
The Oxiperm®C 164 was specially developed for the continuous or discontinuous
generation of a chlorine dioxide (ClO2) solution for water disinfection. The chlorine
dioxide is generated according to the hydrochloric acid (HCl) / sodium chlorite
(NaClO2) procedure in line with the following stoichiometric equation:
5 NaClO2 + 4 HCl 4 ClO2+ 5 NaCl + 2 H2O
Sodium chlorite Hydrochloric acid Chlorine dioxide Sodium chloride Water
!
WARNING The Oxiperm®C 164 is used with 33 % hydrochloric
solution and 24,5 % sodium chlorite solution and a
predefined quantity of dilution water.
If undiluted, the components 33 % hydrochloric solution
and 24,5 % sodium chlorite solution will generate an
explosive concentration!
Therefore, the components 33 % hydrochloric solution
and 24,5 % sodium chlorite solution may only be used
in the Oxiperm®C 164 with a predefined quantity of
dilution water.
The reaction time is approx. 10 minutes (in agreement with the German directive
DVGW, worksheet W 224).

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Oxiperm 164C 4-10 kg en
According to the Oxiperm®C 164 application, a multiple stoichiometric excess of
hydrochloric acid is used for the following reasons:
❏A non-critical chlorine dioxide concentration of 20 g ClO2/ l is generated in
the reactor of the Oxiperm®C 164.
!
WARNING A chlorine dioxide solution with a concentration of
30 g / l may explode if a gas area is present above the
solution.
Gaseous chlorine dioxide is explosive above a
concentration of 300 g / m3.
❏A good yield of chlorine dioxide is achieved with excess acid of 250 -
300%. A further increase in the excess acid only results in a small
improvement in the efficiency.
❏Excess acid shifts the equilibrium of the disproportionation reaction
between hydrochloric acid and sodium chlorite to the right, resulting in an
optimum yield.
4.2 Functional Sequence
❏Three components are required to generate a chlorine dioxide solution:
- Hydrochloric acid (HCl)
- Dilution water (H2O) for HCl
- Sodium chlorite (NaClO2)
- Dilution water (bypass )
The added quantities of these components are defined by the process, and
must not be changed. The flows of the individual components are therefore
monitored by flowmeters and flow controllers.
❏Hydrochloric acid (33% solution) and sodium chlorite (24.5% solution) are
dosed into the reactor with a volume ratio 1:1 together with the dilution
water for HCl.
❏Hydrochloric acid and sodium chlorite react together in the reactor and
generate a concentration of approx. 20 g/l
❏Following the reactor, the chlorine dioxide solution is diluted by the bypass
water into a solution ready for use.
Reactor
HCl
NaClO2 Bypass wa ter H2O
ClO2 solution

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5 Design and Function
5.1 System Design

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Legend:
1 Dosing system for hydrochloric acid (HCl)
Item 1.1 Connection line (HCl)
Item 1.2 Suction pulsation damper or gauging system (HCl)
Item 1.3 Pulsation damper (HCl)
Item 1.4 Flowmeter + flow monitoring (HCl)
Item 1.5 Pressure retention valve or check valve (HCl)
2 Dosing system for sodium chlorite (NaClO2)
Item 2.1 Connection line (NaClO2)
Item 2.2 Suction pulsation damper or gauging system (NaClO2)
Item 2.3 Pulsation damper (NaClO2)
Item 2.4 Flowmeter + flow monitoring (NaClO2)
Item 2.5 Pressure retention valve or check valve (NaClO2)
Item 3 Dosing pump for hydrochloric acid and sodium chlorite
4 Bypass water supply line
Item 4.1 Pressure reducer
Item 4.2 Solenoid valve for bypass
Item 4.3 Flowmeter + flow monitoring
Item 4.4 Check valve
Item 4.5 Dosing ball valve
5 Preliminary dilution (H2O) for hydrochloric acid (HCl)
Item 5.1 Preliminary water tank
Item 5.2 Centrifugal pump
Item 5.3 Impeller meter + flow monitoring
Item 5.4 Flowmeter + flow monitoring
Item 5.5 Check valve
Item 5.6 Ball valve for filling line of preliminary water tank
Item 5.7 Dosing ball valve
Item 5.8 Filling line
Item 6 Reactor
Item 6.1 Temperature sensor
Item 6.2 Emptying of reactor
7 Solution tank for ClO2
Item 7.1 Solution tank
Item 7.2 Level monitoring (LSHH, LSH, LSL, LSLL)
Item 7.3 Absorption filter
Item 7.4 Tank overflow

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Item 7.5 Sampling line for ClO2
Item 7.6 Emptying of solution tank
Item 7.7 Additional overflow contact
8 Suction injector for solution tank
Item 8.1 Injector
Item 8.2 Check valve
Item 8.3 Solenoid valve
Item 9 Solenoid valve for reactor purging unit
Item 10 Controller with display
5.2 Components
5.2.1 Suction Lines for the
Chemicals
The suction lines are not included in the delivery, and must be selected depending
on the tank size. The level in the tanks can be monitored in two stages by the system
controller.
If the level of the components (HCl / NaClO2) drops to the first stage (MIN contact
/ advanced empty alarm), the alarm "HCl – MIN" or "NaClO2– MIN" is output on the
controller as an advanced warning.
This is indicated by flashing of the LED on the controller flowchart (see Section
"Control and display elements on the controller", item 2 and item 5).
The system remains in operation following an advanced empty alarm. A relay
"Advanced empty alarm NaClO2/ HCl" is activated.
The system is switched off when the second stage is reached (MIN-MIN contact /
empty alarm), and the alarm "HCl – empty alarm" or "NaClO2– empty alarm" is
output on the controller.
The "Alarm" relay is then activated (see Section "Control and display elements on
the controller, item 22). The alarm LED lights up red permanently. If a buzzer is
connected to the floating output relay, an audible signal is output.
5.2.2 Dosing Pump HCl/NaClO2
The dosing pump for HCl and NaClO2 is mounted at the bottom of the system frame.
The dosing rate is set using the respective rotary knob (HCl, right - NaClO2, left).
The stroke length is preset, but may have to be corrected following gauging of the
pumps.
Gauging of the dosing pumps is carried out on the system using the respective
gauging system.
Refer to the Table "Performance and consumption data", Section 3.1.1, for the
dosing rate to be set for the pumps.
The dosing rates of the pumps should be set approximately the same (+/- 10-15%)
to guarantee uniform consumption of the chemicals.
The stroke length must not be adjusted any further following gauging.

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5.2.3 Flowmeters
The individual flow quantities are set on the system using rotameters, and
monitored by limit contacts.
An alarm is triggered if the set limits are violated, and the system is switched off.
The LEDs on the controller flowchart light up permanently if the flow quantities are
correctly set (see Section "Control and display elements on the controller", item 1,
item 3, item 4 and item 19).
5.2.4 Bypass Line
The bypass line is located at the front left of the system, and is responsible for
diluting the chlorine dioxide solution generated in the reactor (approx. 20 g/l) down
to 2 g/l to 4 g/l. The water quantity is set using a dosing ball valve.
The water in the bypass is set using a flowmeter and monitored by a limit contact.
This switches the system off if the bypass water falls below a minimum flow. Falling
below the minimum water quantity is also indicated by an LED on the flowchart,
LED OFF. The LED lights up continuously if the water flow is above the minimum
quantity (see Section "Control and display elements on the controller", item 3 ).
The bypass line is equipped with a pressure reducer and solenoid valve. The water
quantity required is different for each Oxiperm system, see also Section 3.1.1,
Performance and consumption data.
NOTE Fit a particle filter upstream if the bypass water is not
free of solids.
5.2.5 Preliminary Dilution for
Hydrochloric Acid
The preliminary dilution for the hydrochloric acid is located at the front right of the
system, and consists of impeller meter, flowmeter, check valve and dosing ball
valve. The water quantity is set using the dosing ball valve, and monitored by limit
contacts and impeller meter. The LEDs on the controller flowchart light up
permanently if the water quantity is correctly set (see Section "Control and display
elements on the controller", item 19). The system is switched off if one of the limits
is violated.
NOTE The tolerance range for the impeller meter is defined in
the PLC program for safety reasons, and cannot be
changed beyond these limits. Tolerance range -10% to
+20%
5.2.6 Reactor
The reactor is mounted at the rear of the system and generates a pressure-free
chlorine dioxide solution of approx. 20 g/l. Each reactor has a temperature sensor
which switches off the system and activates a purging unit should the temperature
rise. The purging unit is time-controlled, and passes a defined quantity of water
through the reactor into the solution tank in order to reduce the increased
temperature.

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5.2.7 Solution Tank for ClO2
The solution tank is also positioned at the rear of the system and serves as a
pressure-free tank for the generated and diluted chlorine dioxide. The solution tank
is also monitored by 5 different contacts: overflow, MAX, MIN and running dry are
directly evaluated by the controller. An additional overflow contact can also be
evaluated, but is not processed by the controller. The solution tank is also equipped
with a filter.
5.2.8 Overflow Unit for Solution
Tank
The solution tank is equipped with an overflow. This is to prevent damage to the
reactor or solution tank should the MAX contact or overflow contact fail or if there
is a pressure rise within the system. The overflow line must be connected such that
appropriate disposal or neutralization of the chlorine dioxide solution is guaranteed.
5.2.9 Suction for Solution Tank
The solution tank is automatically sucked during the filling procedure. The suction
injector is supplied with water via the bypass line and switched by a solenoid valve.
If the system switches off (MAX contact reached on solution tank), the tank suction
is also switched off.
5.2.10 Water Tank for Preliminary
Dilution
The water tank for preliminary dilution of the hydrochloric acid is positioned at the
rear of the system. The water is supplied via a ball valve of the bypass line at the
front of the system. The water quantity in the tank is regulated by a float switch. A
centrifugal pump transports the dilution water to the reactor input in order to
preliminary dilute the hydrochloric acid.
An additional float switch prevents an overflow of the tank should the float valve
fail.
5.2.11 Purging Unit
Each Oxiperm system for concentrated chemicals is equipped with a purging unit.
If the temperature rises in the reactor (as a result of too little dilution water for HCl),
the solenoid valve for the purging unit is opened, and all other system components
(solenoid valve for bypass, solenoid valve for suction, centrifugal pump for
preliminary dilution, and dosing pump for HCl/NaClO2) are switched off. The
purging unit is time-controlled, and passes a defined quantity of water through the
reactor into the solution tank in order to reduce the increased temperature.