Nitrites

Colorimetric, Online Analyzers

NO2-

Applications

  • Drinking water
  • Process optimisation of wastewater treatment plants
  • Industrial and municipal wastewater
  • Mineral water monitoring
  • Surface water
Nitrites
Nitrites

Description

The determination ranges of the nitrite analyzer vary from trace μg/L to 125 mg/L NO2 using the (optional) internal dilution module. The result can be expressed as NO2 or N-NO2.

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.

Reagents

Standard solutions

Features

Range
(Ø 26 mm)		 500 ppb N-NO2 (1.6 ppm NO2)
Range
(Ø 16 mm)		 1 ppm N-NO2 / (3.2 ppm NO2)
Range
(with dilution)		 40 ppm N-NO2 / 125 ppm NO2
Wavelength 525 nm
Number of reagents 2
Min. analysis time 6 minutes

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
Cabinet 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
Protection Grade IP54

Documentation

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