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Total Nitrogen Bound TNb Analytical Equipment

What TNb means and how it is measured.

The TNb (total bound nitrogen) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

What TP means and how it is measured.

The TP (total phosphorus) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.




Online Total Nitrogen Analyser - QuickTONultra

On-Line Monitoring of Total Bounded Nitrogen (TNb) in process or waste water streams

A variety of nitrogen compounds can be present in water.  Nitrogen compounds (such as ammonia, nitrate, nitrites and further organic N-compounds) can be individually determined, but only by investing considerable analytical effort and costs.  Hence the importance of monitoring TNb levels in water.  This parameter has been defined to indicate the amount of Nitrogen which is bound in chemical substances, in different kinds of water.  It is the most reliable nitrogen parameter and can easily be monitored On-Line with our QuickTONultra Analyser system.      

  • Measurement range: 0 - 200 mg/l N (with further measurement ranges available)
  • Response time: 2-3 minutes
  • Up to 6 sample streams can be monitored on one Analyser system
  • High Temperature Combustion (1,200°C) method for complete oxidation without reagents
  • Measurement of complete samples incl. solids/ particles
  • Excellent detection value from ammonia and nitrate nitrogen
  • High salt concentrations possible
  • Catalyst-free technique
  • No filtration necessary
  • No memory effects
  • According to DIN EN 12260:2003 and ISO/TR 11905-2:1997




  • Waste water treatment
  • Process control
  • FlowSampler
  • Multi-stream measurement
  • Combination with COD and TOC detection

  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II

Exact Analysis. At 1,200°C, the complete Total Nitrogen is determined.

For an exact TNb measurement all nitrogen bonds - incl. particles - must be reliably combusted. LAR's unique QuickTONultra is capable of transporting and measuring a high content of solid matter without any filtration requirements. Additionally, complete oxidation of the sample with the high temperature combustion method (patented combustion temperature of 1,200°C) is guaranteed.

This method is perfect for pure and dirty water applications. 

NO Catalysts required

Because of the high temperature the QuickTONultra this Analyser does not need any catalysts.  Complete oxidation of the sample, including particles, slimes and films, are oxidised at 1,200°C.

Lower combustion temperatures, such as 680-1,000°C, require the use of a catalyst to aid oxidation during the measurment. And even then, more complex compounds are often not determined when running at these low combustion temperatures.

Samples with high salt concentrations can easily be monitored

This online TNb analyser can handle salt concentrations of up to 300 g/L sodium chloride (NaCl).  Salts that melt at the temperature of 1,200°C are vaporised by the combustion power and carried out with the carrier gas to settle in a special retrieving device.

The QuickTONultra. Ultra quick measurements and maintenance.

The Total Nitrogen (TNb) measurement takes place within 2 - 3 minutes, making this Analyser a truely Rapid Total Nitrogen monitoring system.

The Total Nitrogen measurment can also be combined with Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) measurments on ONE Analyser system. 

The analyser's availability is over 98%. The weekly service is about 30 minutes.
To request a brochure or to contact us directly, click here


Effluent Monitoring Analyzer QuickTOCNPO

Up to 4 Parameters on ONE Analyser system - the cost effective monitoring of WWTP effluent

  • Total Organic Carbon (TOC),

  • Total Bounded Nitrogen (TNb),

  • Total Phophorus (TP) / Ortho-Posphate (o-P),

  • Chemical Oxygen Demand (COD) 

LAR's QuickTOCNPO is the ultimate online Analyser for the monitoring of WWTP effluent samples.  

Tracking pollution at 1,200°C.

The catalyst-free patented ceramic reactor is the centre piece of the QuickTOCNPO. At 1,200°C, all substances are oxidised without the use or catalysts which enables a complete analysis of samples. The QuickTOCNPO can be delivered with a number of different housings to suit even the most challenging environments with Ex-Zone I and II housings also available.   

The determination of TP / o-P with the use of molybdenum blue.

The Total Phosphorus / o-P is determined by the photometric molybdenum blue method. First the sample is mixed with an oxidising agent then the mixture is fed into the reactor where ultra violet light (UV) activates the sample‘s oxidation. Finally, by adding the molybdenum blue it becomes visible how much TP is in the sample.

Quick measurements and maintenance.

The TNb, TOC and COD measurements take place in less than 3 minutes with the sample being injected directly into the furnace. Maintenance and service requirements are minimal: Less than 30 minutes per week. The analyser‘s availability is over 98%.

Filtration free sample conditioning.

Normally the outlet or effluent of a WWTP is free of particles – or at least there are only a few. In this case the Analyser requires no additional hardware and can use the sample take-up directly from the sample line.  If however there is a high particulate density, the sample should be taken by the filterless, patented FlowSampler.  For more information on the Flowsampler click here

  • Measurement range: TOC: 0.1 - 200 mg/l, TNb: 0.1 - 200 mg/l, TP: 0.01 - 30 mg/l, COD: 1 - 600 mg/l
  • Response time: TOC / COD: 2 - 3 min, TNb: 1 - 3 min, TP: 10 - 15 min
  • Highest combustion temperature (1,200°C) available on the market
  • Photometric molybdenum-blue-method
  • Determination of all 4 parameters at the same time
  • Number of parameters are selectable
  • No filtration necessary
  • No memory effects
  • Very low maintenance and operational costs
  • According to DIN EN 1484:1997-08 (TOC), ISO 8245:1999-03 (TOC), EPA 415.1 (TOC), DIN EN 12260:2003 (TNb), ISO/TR 11905-2:1997 (TNb), DIN EN ISO 6878:2004-09 (TP), DIN EN ISO 15681-1:2005-05 (TP) and DIN EN ISO 15681-2:2005-05 (TP)




  • WWTP control
  • Process control
  • Surface water monitoring
  • Industrial and municipal WWTP
  • FlowSampler
  • Centrifugal separator
  • Single-parameter determination available
  • Combinations of 2 or 3 parameters obtainable

  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II

For additional information please contact us