Elemental Analyzer CHN-O-Rapid Characteristics
Advantages
Applications
Sample weights: from 0.2 to 200 mg, depending on sub stance (e.g., samples of nitroaniline from 0.2 to 25 mg).
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Multifunctional analyzer with four differ ent operational modes: CHN, CH, Ν and Ο (optional); easily converted for Ο determination in only about 5 min.
Recording of sample weights: manual with a balance not connected to the analyzer; automatic with interfaced electronic balance and computer. Sample feed : automatic, 49 samples; can be switched from continuous to single feed. Working temperatures: Combustion zone: 950 to 1050 °C. Reduction zone (two heating tubes): 550 to 700 °C. All three heating tubes may be used for special applications up to 1150 °C. Special combustion tubes for corrosive substances. Combustion time: variable from 0.1 to 9.9 min; recommen ded combustion time: 1.5 to 3 min. Indication of measured values: with computer: automatic print-out in %; with printer (optional): automatic print-out of integrals. Data output: BCD, + 5 volt TTL, positive logic. Standard deviation : ± 0 . 1 % (nitroaniline). Absolute deviation : generally < ± 0.2%. Consumption of gas per analysis: 1 to 1.5 litres of He and 40 to 100 ml of 0 2 for one simultaneous CHN determination. Required consumable reagents and gases: Commercially available reagents, for analysis.
Suitable for all organic and inorganic substances which decompose in an oxygen stream at 1050 °C. • Lower demands on homogeneity by large sample weights. • Uncomplicated, automatic sample feed by vertical combustion furnace: loading of the sample feeder possible at any time during the analytical cycle. • Combustion temperature and tube filling may be adapted flexibly to each measuring problem: hence complete decomposition without additives.
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Each desorption process will not be started by the integrator until the integration of the preceding gas com ponent is completed. Hence, extremely different CHN quantities may be measured.
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Refinery catalysts for the determination of carbon.
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All sorts of coal, from anthracite to lignite.
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Oil shale, crude and processed. Synthetic oils, benzine and petrol. All sorts of petrochemicals and chemicals, liquid (weighed and burnt in tin capsules) and solid.
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Coal liquefaction products. Pharmaceutical products.
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Ocean and river sediments. Samples of the soil.
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Plastics, rubber and synthetic rubber, leather.
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Plants, wood, food, fruits, animal products.
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Substances difficult to combust, e.g., graphite. With graphite, a carbon content of 99.6 to 99.9% was found.
Duration of analysis: Simultaneous CHN determinations: 9 to 14 min, CN determinations: 6 to 9 min, Ν determinations: 6 to 9 min, C determinations: 4 to 6 min. Programme for computer-controlled run of the analysis: hence regular, automatic monitoring of the calibration factors, the reduction tube filling, and the mechanical run of the analysis; automatic transfer of the weighing data. Measuring ranges: N: from 0.02 to 5 mg absolute C: from 0.01 to 15 mg absolute H: from 0.001 to 1.5 mg absolute O: fromppm range to % range, depending on the film thickness of the non-dis persive IR photometer. Design featuring easy servicing and hand ling (handy with leak tests, tube changes, etc.) Inexpensive disposable tin boats or cap sules for liquid samples.
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Combustion tube
Φ
Sample receiving tube
CD Reduction tube ®
HL,0 adsorption column
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C 0 2 adsorption column
@ Thermal conduclivity detector
fcjiftffi Cerium dioxide H H
Copper oxide (wire)
ί ^ ξ ξ ^ Copper (wire)
Integrator
ji%j%j Lead chromate l U ^ H Silver wool
Functional Diagram: Simultaneous CHN Determination
Polymers, including those which contain halogens (phosphorus, sulphur), e.g., also Teflon®. Petroleum products such as diesel oils, benzine, petrol, lubricants, oil additives, and heating fuel oil.
Examples: Complex Substances Substance
Plastics Oil Soil Hard coal Lignite coke Lignite briquettes (free from water and ashes)
Range of sample weights (mg)
% Ν %C
%H
10-
30
2.35 12.81
2-
15
0.14 85.20 10.30 0.17 2.79 0.40
30-200
3.05
3-
15
1.44 75.50
4.92
4-
15
0.30 98.40
0.30
6-
15
0.77 71.50
4.93
