Operating principle ONH
For the analysis of the elements O, N and H, the metal sample is thermally decomposed. The metal sample is heated in a graphite crucible in an induction furnace. Temperatures of up to 3000 °C can be reached here. Helium or nitrogen is used as carrier gas. The released gases, whereby the oxygen O reacts with the carbon C of the graphite crucible to form carbon monoxide CO, flow through various stations (catalysis, absorber, etc.) of the measuring system with the help of the carrier gas flow and are detected in the corresponding measuring cells. The oxygen content is determined via the CO2 content in an infrared measuring cell. The molecular hydrogen and nitrogen is measured with a thermal conductivity cell. Since the thermal conductivity cell is used to determine hydrogen and nitrogen, the analyzer works in two different operating modes and can therefore detect either nitrogen or hydrogen.
- ON mode: Determination of oxygen and nitrogen with the carrier gas helium
- OH mode: Determination of oxygen and hydrogen with the carrier gas nitrogen
Functional principle CS
A high-frequency combustion of the metal samples takes place at approx. 2300 °C in a pure oxygen atmosphere. During combustion, the released carbon components are oxidized to CO/CO₂ and sulfur components to SO₂. Dust and water are then filtered out of the combustion gas. The combustion gases are passed on to the corresponding infrared measuring cells in the carrier gas flow (oxygen). Compact samples as well as chips, wires or powder can be analyzed for both ONH and CS.