Indian Council of Agricultural Research
(Agricultural Knowledge Management Information System)

ICAR-National Bureau of Soil Survey & Land Use Planning, Amravati Road, Nagpur-440033 Maharashtra (
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Instrument Details
Instrument/Facility Name: CHNS Analyzer
Make                                   : Elementar, Germany
Model                                  : vario EL cube series
Specification   :Estimation of element concentrations of carbon, hydrogen, nitrogen and sulphur in the given sample

Click to ViewThe CHNS Analyzer find utility in determining the percentages of Carbon, Hydrogen, Nitrogen and Sulphur of organic compounds, based on the principle of "Dumas method" which involves the complete and instantaneous oxidation of the sample by "flash combustion". The combustion products are separated by a chromatographic column and detected by the thermal conductivity detector (T.C.D.), which gives an output signal proportional to the concentration of the individual components of the mixture.

  Working Principles
Click to ViewThe samples are weighed in tin or silver vessels and loaded in the integrated carousel. In a fully automatic process, the transfer of the sample through the ball valve into the combustion tube is performed. Each sample is individually flushed with carrier gas (Heraeus patent) to remove atmospheric nitrogen, resulting in a zero blank sampling process. The catalytic combustion is carried out at a permanent temperature of up to 1200 °C. Subsequently, the reduction of the combustion gases on hot copper is carried out in a second furnace. The formed analysis gases, N2, CO2, H2O and SO2 remain in the He carrier gas stream. The gas mixture is separated in its components via three columns by the well proven purge & traps chromatography and is subsequently fed into a thermal conductivity detector (TCD). The TCD is based on thermistor technology, is impervious to damage from oxygen intrusion and stands out for particularly high stability and measuring dynamics. Right before the detector an electronic gas flow controller ensures absolutely stable pressure and flow conditions. A connected PC computes the element concentration from the detector signal, and the sample weight on the basis of stored calibration curves.

  User Instructions
Soil and water sample analysisSample must be homogenised. Sample weight should be in between 40-50mg. Liquid samples should have constant weight.

  Contact Us
Contact No. +91-712-2500386
Email Id

  CHNS Analyzer Charges
Procedure Name
National LAB/R&D
Estimation Total C,N and S in soil and water sample

Additional Rs 100/-towards postal charges if result are to be posted
The Demand Draft should be in favour of "Director, ICAR-NBSS&LUP, Nagpur"
Letter, DD & Samples send to "ICAR-National Bureau of Soil Survey and Land Use Planning, Amravati Road, Nagpur-440 033 "