V3.00/EN/00585069
Page 1/9Data Sheet 202631
-802*PE+&R.*
'HOLYHU\DGGUHVV 0DFNHQURGWVWUDH
)XOGD*HUPDQ\
3RVWDODGGUHVV
)XOGD*HUPDQ\
3KRQH 
)D[�� 
(PDLO PDLO#MXPRQHW
,QWHUQHW ZZZMXPRQHW
-802,QVWUXPHQW&R/WG
-802+RXVH
7HPSOH%DQN5LYHUZD\
+DUORZ(VVH[&0'<8.
3KRQH 
)D[ 
(PDLO VDOHV#MXPRFRXN
,QWHUQHW ZZZMXPRFRXN
-8023URFHVV&RQWURO,QF
0\HUV5RDG
(DVW6\UDFXVH1<86$
3KRQH 
)D[ 
(PDLO LQIRXV#MXPRQHW
,QWHUQHW ZZZMXPRXVDFRP
20263100T10Z001K000
JUMO tecLine TC
Sensors for total chlorine
Brief description
These membrane-covered amperometric sensors are used to measure the total chlorine con-
centration in water.
The sensors acquire the total of "free chlorine" (chlorine gas, hypochlorite, etc.) and "combined
chlorine" (chloramine, organically combined chlorine).
The sensors are not suitable for detecting the absence of chlorine.
The sensors' integrated electronics provide a temperature-compensated current signal
(4 to 20 mA) for the variant with an analog output signal, and a Modbus RTU signal for the variant
with a digital interface. A downstream device (indicator, controller, recorder, PLC, etc.) is used
for calibration.
The sensors can be connected directly to various indicating devices/transmitters/controllers (see
"Suitable indicating devices/transmitters/controllers ", page 7). They provide the voltage re-
quired for supplying the sensors and allow for easy calibration of the measuring system.
Application areas: measurements in drinking water, swimming pool water, service water, sea-
water.
Type 202631/44 Output signal 4 to 20 mA
Type 202631/52 Digital interface output signal
Type 202631/52...
Application example
Additional indicating devices/controllers: "Suitable indicating devices/transmitters/
controllers ", page 7
Voltage supply
from JUMO
dTRANS AS 02
Outputs*:
Example:
Indicator/controller for standard signals
JUMO dTRANS AS 02
* Possible combinations
s 2025ee data sheet 53
Relay outputs
Binary outputs
Calibrated analog outputs
(free chlorine, chlorine dioxide,
ozone, 0(4) to 20 mA / 0 to 10 V,
galvanically isolated)
Interfaces
(Modbus, PROFIBUS-DP,
data logger)
U c atedn alibr
sensor signal
(4 20 mA)to
JUMO combination fitting
with sensor
Special features
• 3-electrode principle
• Easy calibration
• Integrated temperature compensation
• Proven measuring system
• Electrical connection, analog or
digital
• Connection to JUMO digiLine system
optional
V3.00/EN/00585069
Page 2/9Data Sheet 202631
-802*PE+&R.*
'HOLYHU\DGGUHVV 0DFNHQURGWVWUDH
)XOGD*HUPDQ\
3RVWDODGGUHVV
)XOGD*HUPDQ\
3KRQH 
)D[ 
(PDLO PDLO#MXPRQHW
,QWHUQHW ZZZMXPRQHW
-802,QVWUXPHQW&R/WG
-802+RXVH
7HPSOH%DQN5LYHUZD\
+DUORZ(VVH[&0'<8.
3KRQH 
)D[ 
(PDLO VDOHV#MXPRFRXN
,QWHUQHW ZZZMXPRFRXN
-8023URFHVV&RQWURO,QF
0\HUV5RDG
(DVW6\UDFXVH1<86$
3KRQH 
)D[ 
(PDLO LQIRXV#MXPRQHW
,QWHUQHW ZZZMXPRXVDFRP
20263100T10Z001K000
Important information
General information
• Measuring is only possible in a suitable flow fitting (see accessories).
• The flow rate from the measurement medium must be at least 15 cm/s (0.5 l/min) in order for the sensor to work correctly. The minimum inflow
can be guaranteed using the JUMO combination fitting or the JUMO individual fitting in connection with the JUMO flow monitor for disinfectant
measurands (see accessories).
• For calibration, a test set is required to determine the total chlorine content using the DPD method; corresponding photo- or colorimetric test
sets are commercially available.
• To make sure the sensor works correctly, only one disinfectant should be used at a time.
• The measurement medium must have either drinking water or swimming pool water quality (visually clear, no solid particles).
• The spare part set for seawater (part no. 00687805) is required for seawater applications.
• More information on the setup and use of amperometric sensors can be found in our brochure "Information on amperometric measurement
of free chlorine, chlorine dioxide and ozone in water".
Notes on slope for type 202631/44
• The slope of these sensors can vary depending on the manufacture and application by between 65 % and 150 % of the nominal slope. To
determine the appropriate measuring range or appropriate sensor, it is therefore recommended that the concentration to be measured be
multiplied by a factor of 1.5.
Example: concentration to be measured 1.6 ppm × factor 1.5 = 2.4 ppm => recommended sensor with measuring range 5 ppm
Required components for a measuring point
The following components are required to set up a measuring point for measuring total chlorine:
• amperometric sensor, membrane-covered
• transmitter/controller
• flow monitor (optional extra, recommended)
• fitting for membrane-covered sensors
sensor slope depending on the pH value
Temperature: 25 °C / flow rate: 30 l/h
pH control
pH value
HCLO [%] / slope [%]
(pH 7.2 = 100 %)
HCLO dissociation curve Sensor type 202631
4 5 6 7 8 9 10 11 12
0
20
40
60
80
100
120
140
160