Monitor Your Bromination Process Easily and Precisely with our Sensors

The membrane-covered, amperometric sensor works on the three-electrode principle; it is used for the online measurement of hypobromous acid (HOBr). The electronic components integrated in the sensors provide a temperature-compensated current signal (4 to 20 mA) or a Modbus RTU output signal.

The disinfectant bromine offers a greater disinfectant effect and higher pH value compared with chlorine compounds, while having a low corrosive effect. Abreacted bromine solutions irritate the mucous membranes to a lesser extent and have a neutral odor.

The membrane-covered, amperometric sensor works on the 3-electrode principle; it is used for online measurement hypobromous acid (HOBr). Suitable bromination methods include free bromine (HOBr) as well as 1-bromine-3-chlorine-5.5-dimethyl-hydantoin (BCDMH).

Depending on the type, the electronics integrated in the sensors provide a temperature-compensated current signal (4 to 20 mA) or a Modbus RTU output signal. A downstream device (indicator, controller, recorder, PLC, etc.) is used for calibration.

The sensor can be connected directly to indicating devices/transmitters/controllers. They supply the sensor with voltage and allow for easy calibration of the measuring system.

The sensor is not suitable for detecting the absence of bromine.

Features

• 3-electrode principle
• Easy calibration
• Integrated temperature compensation
• Proven measuring system
• Electrical connection analog or digital
• Connection to JUMO digiLine system optional

Application

• Measurements in cooling water
• Swimming pool water
• Service water
• Process water
• Seawater

Technical Information
Sensor Type	202637/61 (output signal 4 to 20 mA)	202637/71 (digital interface output signal)
Measurand	Hypobromous acid (HOBr)
Area of application Suitable bromination methods	Disinfection of drinking water, swimming pool water, service water, process water and seawater free bromine (HOBr) 1-bromine-3-chlorine-5.5-dimethyl-hydantoin (BCDMH)
Measuring Principle	Membrane-covered, amperometric, potentiostatic three-electrode system with integrated electronics
Measuring Cable Connection	2-pin terminal connection (2 × 1 mm2)	5-pin flange connector, M12
Voltage Supply	UB DC 12 to 30 V (galvanic isolation required)	UB DC 22.5 to 26 V (galvanically isolated from the sensor)
Electromagnetic compatibilitya	Interference emission: class Bb Interference immunity: to industrial requirements
Output Signal	4 to 20 mA	Modbus RTU
Burden/current Consumption	≤ (UB – 7.5 V) ÷ 0.02 A	approx. 20 mA
Settling Time	Approx. 2 h for initial startup
Inflow speed	Approx. 15 cm/s (corresponds to a flow of approx. 30 l/h when installed in the JUMO flow fitting (part no.: 00392611))
Measuring Rangesc	0.005 to 2 mg/l (ppm) 0.05 to 20 mg/l (ppm)
Resolution	0.001 mg/l with measuring range 2 mg/l 0.01 mg/l with measuring range 20 mg/l
Response time t90	approx. 2 minutes
Operating temperature Measurement water  ambience	0 to 45 °Cd 0 to 55 °C
Temperature compensation	Automatic, using integrated temperature probee
pH value area of application	pH 6.5 to pH 9.5
Zero point adjustment	Not required
Slope adjustment	On evaluation unit/controller using analytical determination
Disturbances	Cl2: is also measured ClO2: is also measured O3: is also measured Corrosion inhibitors and water hardness stabilizers can lead to measuring errors
Absence of the disinfectant	max. 24 h
Pressure resistancef	pabs max. 1.5 bar prel max. 0.5 bar
Materials	PVC-U, PEEK, stainless steel 1.4571
Dimensions	Dia. 25 mm, length 220 mm	Dia. 25 mm, length 205 mm
Weight	Approx. 125 g
Maintenance Inspection of the measuring signal Replacement of membrane cap Replacement of electrolyte	Regularly, at least once a week Once a year (depending on the quality of the water) Every 3 to 6 months
Storage Sensor Membrane Cap Electrolyte	Can be stored indefinitely in a dry place, without electrolyte, between +5 and 40 °C Can be stored indefinitely in the original packaging at +5 to 40 °C. In original bottle, away from sunlight, for at least one year (or up to minimum best by date) at +5 to 35 °C.C

^a EN 61326-1, EN 61326-2-3
^b The product is suitable for industrial use as well as for households and small businesses.
^c Other measuring ranges upon request.
^d Prerequisite: no ice crystals in the measurement medium.
^e Prerequisite: no temperature jumps in the measurement medium.
^f No pressure fluctuations admissible. Pressure-free operation (atmospheric pressure) recommended.