Instruction Manual

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-WERKE C 7000 Ver. 07 09.07

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lated. The quantity of this external energy must be known for the calculation, and

must be entered with the pre-test parameters (SUHSDU) as TH[WU. The quantity of

combustion aid used should be kept as small as possible.

Almost all substances to be analysed contain some sulphur and nitrogen. Under the

pressure and temperature conditions in the decomposition vessel, they burn to form

, SO

and NO

. In combination with water formed during combustion, they form

sulphuric and nitric acids, and produce heat of solution. This heat of solution is taken

into account in the calculation as described in DIN 51900. To be sure that all acids

formed are quantitatively assessed, ca. 5 to 10 ml of distilled water or other suitable

absorption liquid can be added to the decomposition vessel before the test.

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After combustion, the water is collected and the decomposition vessel thoroughly

rinsed with distilled water. The rinsing water and the collected water are mixed, and

their acid content investigated. If the sulphur content of the fuel and the nitric acid

correction are known, analysis of the water is unnecessary.

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