Applications
- Drinking water
- Process optimisation of wastewater treatment plants
- Industrial and municipal wastewater
- Mineral water monitoring
- Surface water

Description
Multiparameter online analyzer for the determination of nitrites and nitrates in water.
The instrument is ideal for potable water or suface water analysis and with the addition of a dilution module is also capable of the determination of nitrites and nitrates in complex matrices such as urban and industrial wastewaters.
Method
In acidic media, nitrites react with sulfanilamide and N-(1-naphthyl)-ethylene diammonium dichloride, forming a purple colored dye. The absorbance intensity is proportional to the nitrites concentration in the sample and is determined at 525 nm.
Features
Measured parameter | NO2- | ||||||
Range
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Reproducibility*
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Limit of detection | 5 ppb |
Wavelength | 525 nm | ||||
Demineralized water | Not required | ||||
Number of reagents | 2 | ||||
Min. analysis time | 7 minutes | ||||
Default analysis time | 15 minutes | ||||
Reagent consumption**
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Reagents and standards
Both hydrazine and copper catalyst reagents are used to reduce Nitrate to Nitrite in a basic medium inside a heated reaction cell. A sulfanilamide and N-(1-naphthyl)-ethylene diammonium dichloride reagent is added to react with the Nitrite to form a purple colored compound. The absorbance intensity is proportional to the Nitrite concentration in the sample and is measured at 525 nm
Features
Measured parameter | NO3- | ||||||
Range
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Reproducibility*
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Limit of detection | 2 ppb |
Wavelength | 525 nm | ||||
Demineralized water | Not required | ||||
Termoregulation | 37 °C | ||||
Number of reagents | 3 | ||||
Min. analysis time | 11 minutes | ||||
Default analysis time | 20 minutes | ||||
Reagent consumption**
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Reagents and standards
Technical Specifications
Model | 3S-CL |
Sampling Mode | Batch, with freely settable frequency. |
Sample | Pressure: Atmospheric Temperature: 5 ‐ 45°C (41 ‐ 113°F) Flow Rate: 80 to 500 mL/min Connection: 6 mm (¼-in.) |
Drain |
Pressure-free drain Connection: 12 mm (½-in.) |
Input Streams | 2 |
Material | Epoxy-coated stainless steel AISI 304 |
Dimensions (H x W x D) | 604 x 380 x 210 mm (23.6 x 14.8 x 8.2 in) |
Weight | 20 kg (44 lbs) |
Power Supply |
Input Voltage: 115 VAC,230 VAC,24 VDC Power consumption: max. 80 W |
Output signals |
2 x 4-20 mA analog outputs Modbus via RS485,Ethernet |
Alarms | 2 SPDT programmable voltage-free relays |
Digital Input | None, Online, Start Extra, Skip Idle, Emergency Stop |
Ambient Temperature | 5 - 45 °C (41 - 113 °F) |
Ambient Humidity | 10 - 90 % RH (non-condensing) |
Protection Grade | IP54 (indoor only, outdoor use possible with external cabinet, not included) |