ProMinent Dulcotest - Sensors for Chlorite

Reliable online measurement of chlorite – with DULCOTEST sensors.

As a by-product of the treatment of water with chlorine dioxide and in potable water generation, chlorite is subject to monitoring requirements in many countries.

Our product line of DULCOTEST chlorite sensors provides two types of sensor for different measuring ranges. In the treatment of potable water previously treated with chlorine dioxide, the chlorite level must be monitored before the water enters the distribution network to ensure it does not exceed the limit of 0.2 ppm. The sensitivity and precision of sensor type CLT-mA-0.5ppm have been optimised for this measuring task. The suitability of the sensor type for safety-relevant monitoring was confirmed in an independent study by the DVGW, with the measuring method being expressly recommended for this application.

Sensor type CLT-mA-2ppm with a measuring range up to 2 ppm is also available for the monitoring of metering processes involving higher chlorine dioxide concentrations.

• Precise, real-time amperometric measurement for efficient process control
• Amperometric measuring means no clouding or discolouration
• No cross sensitivity in the presence of chlorine dioxide, chlorine or chlorate
• High sensitivity for trace measurement in waterworks up to 0.5 ppm (type CLT 1-mA-0.5 ppm)
• Greater measuring range up to 2 ppm for other applications in combination with chlorine dioxide treatment and particularly for quality inspection of chlorine dioxide generators (type CLT 1-mA-2 ppm)
• Stable zero point means no drift

Technical Details

• Evaluation limit of type CLT-mA-0.5ppm < 0.02 mg/l
• pH range: 6.5 … 9.5
• Temperature: 1º … 40º C
• Pressure max. 1.0 bar
• Signal outputs: CLT1-mA: 4-20 mA signal, temperature-compensated, uncalibrated, not electrically isolated; CLT1-CAN: digital, temperature-compensated, uncalibrated, electrically isolated.

Chlorite Sensor, CLT 1-mA

Sensor for monitoring the disinfection by-product chlorite in compliance with potable water regulations. Without cross-sensitivity towards chlorine dioxide, chlorate and chlorine. For operation on controllers with 4-20 mA input

• Measured variable: Chlorite anion (ClO2–)
• Reference method: DPD method, chlorite in the presence of chlorine dioxide
• pH range: 6.5 … 9.5
• Cross sensitivity: Ozone
• Temperature: 1 … 40 °C
• Max. pressure: 1.0 bar
• Intake flow: 30…60 l/h (in DGM or DLG III)
• Supply voltage: 16...24 V DC (two-wire technology)
• Output signal: 4…20 mA ≈ measuring range, temperature-compensated, uncalibrated, not electrically isolated
• Selectivity: Chlorite selective towards chlorine dioxide, chlorate and free chlorine
• Installation: Bypass: open sample water outlet
• Sensor fitting: DGM, DLG III
• Measuring and control equipment: D1C, DAC
• Typical applications: Monitoring of chlorine dioxide treated potable water or similar water. The selective measurement of chlorite alongside chlorine dioxide, chlorine and chlorate is possible.
• Resistance to: surfactants
• Measuring principle, technology: Amperometric, 2 electrodes, membrane-covered

Chlorite sensors complete with 50 ml of electrolyte.

Note: A mounting kit (order no. 815079) is required for initial fitting of the chlorite sensors in the in-line probe housing DLG III.

• The DT4 photometer is recommended for calibration of the chlorite sensor.

Chlorite Sensor CLT 1-CAN

Sensor for monitoring the disinfection by-product chlorite in compliance with potable water regulations. Without cross-sensitivity towards chlorine dioxide, chlorate and chlorine. For use on controllers with CAN-bus connection

Sensors for connection to a CAN interface (e.g. Disinfection Controller)

• Measured variable: Chlorite anion (ClO2-)
• Reference method: DPD method, chlorite together with chlorine dioxide
• pH range: 6.5 … 9.5
• Cross sensitivity: reduzierende Chemikalien, z. B. Fe2+, Mn2+
• Temperature: 1 … 40 °C
• Max. pressure: 1.0 bar
• Intake flow: 30…60 l/h (in DGM or DLG III)
• Supply voltage: Via CAN interface (11-30 V)
• Output signal: Uncalibrated, temperature-compensated, electrically isolated
• Response time sensor t90: 3 min.
• Selectivity: Chlorite selective towards chlorine dioxide, chlorate and free chlorine
• Installation: Bypass: open sample water outlet
• Parts number/Identity code: DGM, DLG III
• Measuring and control equipment: DULCOMARIN II
• Typical applications: Monitoring of potable water or similar water treated with chlorine dioxide. Selective measurement of chlorite and chlorine dioxide, chlorine and chlorate is also possible.
• Resistance to: surfactants
• Measuring principle, technology: Amperometric, 2 electrodes, membrane-covered

* Complete with 100 ml of electrolyte, connecting cable - CAN M12 5-pin 0.5 m, T-distributor M12 5-pin CAN

• Potable water treatment: all stages in which chlorine dioxide is used for oxidation or disinfection.
• Use of chlorine dioxide
• Disinfection with chlorine dioxide in the food and beverage industry