JUMO tecLine ClO2 User manual

20263400T90Z001K000
V3.00/EN/00585740/2022-10-28
JUMO tecLine ClO2 and O3
Sensors for chlorine dioxide (ClO2) and ozone (O3)
Typ 202634
Operating Manual

Contents
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.1.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.1.2 Warning symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.1.3 Note symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Areas of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.3 Output signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.4 Suitable indicators/transmitters/controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.5 Sensor details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.6 Important information for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.6.1 Notes for all types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.6.2 Notes for types with hydrophobic membranes (202634/45, /50, /60, /65) . . . . . . . . . . . . . .11
3 Identifying the device version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Nameplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 Order details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
3.4 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Important information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2 Combination fitting (type 202811/10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2.1 Mounting the combination fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2.2 Installing the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3 Flow fitting for membrane-covered sensors (type 202811/30) . . . . . . . . . . . . . . . . . . . . . . .22
4.3.1 Mounting the fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.3.2 Installing the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.4 Flow monitor for disinfection measurands (type 202811/20). . . . . . . . . . . . . . . . . . . . . . . . .24
4.4.1 Mounting the flow monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Sensors with an output signal of 4 to 20 mA (types 202634/45, /47, /50, and /52). . . . . . . .25
5.1.1 General requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.1.2 Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.1.3 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
5.2 Sensors with digital interface output signal (types 202634/60, /62, /65, and /67). . . . . . . . .27
5.2.1 General requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.2.2 Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.3 Flow monitoring (combination fitting and flow monitor). . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.3.1 Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Contents
5.4 Combination fitting temperature probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.4.1 Terminal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
5.5 Example of a measuring section with the sensor type 202634/45 . . . . . . . . . . . . . . . . . . . .28
5.5.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
5.5.2 Connection example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1 Important notes for screwing the membrane cap on and off. . . . . . . . . . . . . . . . . . . . . . . . .29
6.2 Initial filling and installation of the membrane cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6.2.1 Types with hydrophobic membranes (202634/45, /50, /60, /65) . . . . . . . . . . . . . . . . . . . . . .30
6.2.2 Types with membranes that are insensitive to chemicals (202634/47, /52, /62, /67) . . . . . .32
6.3 Minimum inflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
6.3.1 Adjusting the minimum inflow (combination fitting and flow monitor) . . . . . . . . . . . . . . . . . .34
6.4 Settling time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
7 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.2 Calibrating with an indicator/controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.1 Replacing the electrolyte. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
9.1.1 Types with hydrophobic membranes (202634/45, /50, /60, /65) . . . . . . . . . . . . . . . . . . . . . .37
9.1.2 Types with membranes that are insensitive to chemicals (202634/47, /52, /62, /67) . . . . . .39
9.2 Replacing the membrane cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
9.2.1 Types with hydrophobic membranes (202634/45, /50, /60, /65) . . . . . . . . . . . . . . . . . . . . . .41
9.2.2 Types with membranes that are insensitive to chemicals (202634/47, /52, /62, /67) . . . . . .43
9.3 Removing calcium deposits from the membrane cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.4 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.5 Consumable material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
10 Overcoming errors and malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
10.1 General troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
10.2 Specific troubleshooting on the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.1 Testing the leak-tightness of the membrane cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.2 Electronics test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.3 Testing the zero point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
10.2.4 Measurement signal test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
10.2.5 Testing the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Contents
11 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
11.1 Sensors for chlorine dioxide (ClO2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
11.1.1 Version with output signal 4 to 20 mA (type 202634/45). . . . . . . . . . . . . . . . . . . . . . . . . . . .51
11.1.2 Version with digital interface output signal (type 202634/65) . . . . . . . . . . . . . . . . . . . . . . . .52
11.2 Sensors for chlorine dioxide (ClO2) with membranes that are insensitive to chemicals . . . .53
11.2.1 Version with output signal 4 to 20 mA (type 202634/47). . . . . . . . . . . . . . . . . . . . . . . . . . . .53
11.2.2 Version with digital interface output signal (type 202634/67) . . . . . . . . . . . . . . . . . . . . . . . .55
11.3 Sensors for ozone (O3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
11.3.1 Version with output signal 4 to 20 mA (type 202634/50). . . . . . . . . . . . . . . . . . . . . . . . . . . .56
11.3.2 Version with digital interface output signal (type 202634/60) . . . . . . . . . . . . . . . . . . . . . . . .57
11.4 Sensors for ozone (O3) with membranes that are insensitive to chemicals . . . . . . . . . . . . .58
11.4.1 Version with output signal 4 to 20 mA (type 202634/52). . . . . . . . . . . . . . . . . . . . . . . . . . . .58
11.4.2 Version with digital interface output signal (type 202634/62) . . . . . . . . . . . . . . . . . . . . . . . .59
11.5 All sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
11.5.1 Maintenance, storage, and transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
12 China RoHS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

6
1 Introduction
1Introduction
1.1 Safety information
1.1.1 General Information
This manual contains information that must be observed in the interest of your own safety and to avoid
material damage. This information is supported by symbols which are used in this manual as indicated.
Please read this manual before starting up the device. Store this manual in a place that is accessible to
all users at all times.
If difficulties occur during startup, please do not intervene in any way that could jeopardize your warranty
rights!
1.1.2 Warning symbols
WARNING!
This symbol in connection with the signal word indicates that personal injury may occur if the respective
precautionary measures are not carried out.
NOTICE!
This note in connection with the signal word indicates that material damage or data loss will occur if
the respective precautionary measures are not taken.
1.1.3 Note symbols
NOTE!
This symbol refers to important information about the product, its handling, or additional benefits.

7
2 Description
2 Desc rip tion
2.1 Areas of application
These membrane-covered amperometric sensors are used to determine the concentration of chlorine
dioxide or ozone in water.
Typical areas of application include the monitoring of swimming pool, drinking, service, process, and
cooling water.
The sensors with hydrophobic PTFE membranes (types 202634/45, /65, /50, and /60) can only be used
in media of swimming pool or drinking water quality.
The sensors with membranes that are insensitive to chemicals and surfactants (types 202634/47, /67, /
52, and /62) can be used in media with almost all water qualities.
NOTE!
Solid materials in the media clog up the membrane and prevent the sensors from working correctly.
NOTE!
Calcium oxide can block the membrane.
NOTE!
The sensors are not suitable for detecting the absence of chlorine dioxide or ozone.
2.2 Design
The sensors have a membrane-covered, amperometric two-electrode measuring system.
The working electrodes (cathodes) are made of gold (Au). The anodes, which perform the role of a com-
bined reference and counter electrode, are made of silver (Ag) and have a silver halide (AgHal) coating.
For the measuring methods used here, chlorine dioxide or ozone diffuses through the membrane from
the measurement medium and, combined with the electrolytes, triggers an electrical signal at the work-
ing electrode. This signal is proportional to the concentration of chlorine dioxide or ozone and is amplified
by the electronics. The measurement signal is mainly independent of the temperature of the media
thanks to integrated temperature compensation.
2.3 Output signal
As the measurement signal of the amperometric sensors is temperature-dependent, an automatic tem-
perature compensation is carried out by an integrated NTC resistor. The recommended temperature
range is 01 to +45 °C.
In the analog versions, the integrated sensor electronics provide a current signal of 4 to 20 mA, and in
the digital versions, they provide a Modbus RTU interface signal.
Calibration is carried out in a downstream device (indicator, controller, recorder, PLC, etc.).
The sensors can be connected directly to any suitable indicators and controllers. They provide the volt-
age required for supplying the sensors and allow for easy calibration of the measuring systems.
1Prerequisite: no ice crystals in the measuring water.

2 Description
8
2.4 Suitable indicators/transmitters/controllers
Type Features Suitable sensors
JUMO AQUIS 500 AS Single-channel (4 to 20 mA) indicating de-
vice/controller, additional temperature in-
put, binary input, up to 2 analog and
switching outputs
Types 202634/45, /47, /50,
and /52 (output signal of
4 to 20 mA)
JUMO AQUIS 500 RS Single-channel (Modbus RTU) indicating
device/controller, additional temperature in-
put, binary input, up to 2 analog and switch-
ing outputs
Types 202634/60, /62, /65,
and /67 (digital interface)
JUMO dTRANS AS 02 Modular multichannel transmitter/controller
for standard signals, PROFIBUS-DP,
RS422/485, data logger using optional
boards
Types 202634/45, /47, /50,
and /52 (output signal of
4 to 20 mA)
JUMO AQUIS touch S/P Modular multichannel measuring devices
for liquid analysis with integrated controller
and paperless recorder, USB host, USB de-
vice, Modbus, PROFIBUS DP, and Ether-
net using optional boards
All types 202634

9
2 Description
2.5 Sensor details
Types 202634/45 and /50
4to 20 mA version
Types 202634/60 and /65
Modbus RTU version
(1) Valve opening
(2) PTFE membrane
(3) Membrane cap
(4) Transparent cover (hose ring)
(5) Measuring electrode
(6) Electrode finger (reference electrode)
(7) O-ring
(8) Sensor shaft with integrated electronic components
(9) 2-pole terminal for measuring cable connection
(10) O-ring
(11) Cover
(12) Pg screw connection
(13) M12 flange connector
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(1)
(9)
(10)
(11)
(12)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(1)
(13)

2 Description
10
Types 202634/47 and /52
4to20mA version,
membrane that is insensitive to chemicals
Types 202634/62 and /67
Modbus RTU version,
membrane that is insensitive to chemicals
(1) Membrane disk
(2) Membrane holder (stainless steel)
(3) Membrane cap
(4) Working electrode of the electrode finger
(5) Reference electrode of the electrode finger
(6) Pressure equalization opening
(7) O-ring
(8) Sensor body with integrated electronic components
(9) 2-pole terminal for measuring cable connection
(10) O-ring
(11) Cover
(12) Pg screw connection
(13) M12 flange connector