Oxygen, Nitrogen and Hydrogen Analyzer: ELEMENTRAC ONH-ρ

The ELEMENTRAC ONH-ρ determines oxygen, hydrogen and nitrogen in inorganic samples by inert gas fusion in an impulse furnace with temperatures exceeding 3,000 °C.

The ELEMENTRAC ONH-ρ ensures precise and rapid sample analysis. The analyzer covers a broad range of applications such as ceramics, metal and other inorganic materials.

The ELEMENTRAC ONH-ρ is available with up to two infrared cells with varying path lengths, allowing both low and high level oxygen analyses. Nitrogen and hydrogen concentrations are established in the ELEMENTRAC ONH-ρ by a sturdy and sensitive thermal conductivity cell.

Application Examples

Alloys, ceramics, cast iron, copper, steel, refractory metals,...

Product Advantages

  • Simultaneous oxygen/nitrogen or oxygen/hydrogen determination with inert gas fusion method
  • Closed gas management and enhanced gas circulation for sensitive ONH determination
  • Powerful catalyst furnace for precise oxygen measurement
  • Gas flow system with electronic gas flow control and new leakage test
  • Use of cost efficient argon as carrier gas possible
  • Flexible configurations and measuring ranges for O, N and H
  • Water-cooled sample port system for effective elimination of atmospheric gases
  • High sensitivity IR and TC cells with low detection limits
  • Economic analysis of grains without capsules
  • Short analysis time
  • Robust 8,5 kW* impulse furnace for temperatures in excess of 3,000 °C
  • Cooling via tap water or chiller or heat exchanger
  • Chemicals and tubes are concealed behind a door (removable)
  • Powerful software supports data and application export, comment fields, etc. Single and multipoint calibration (linear regression)

Features

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Measured elements hydrogen, nitrogen, oxygen
Samples inorganic
Furnace alignment vertical
Sample carrier graphite crucibles
Field of application ceramics, engineering / electronics, steel / metallurgy
Furnace electrode impulse furnace (max. 8,5 KW*), temperatures in excess of 3,000 °C
Detection method solid state infrared absorption for oxygen thermal conductivity for nitrogen and hydrogen
Typical analysis time 120 - 180 s
Chemicals required copper oxide, magnesium perchlorate, Schuetze reagents, sodium hydroxide
Gas required compressed air, helium 99.995 % pure, nitrogen 99.995% pure, argon 99.995% pure (if required), all gases with (2 - 4 bar / 30 - 60 psi)
Power requirements 3~ 400 V, 50/60 Hz, max. 8,500 W
Dimensions (W x H x D) 57 x 77 x 63 cm
Weight ~ 161 kg
Required equipment balance (resolution 0.0001 g), monitor, PC
Optional accessories carrier gas purification, external chiller, gas calibration unit
- * limited to 6.8 kw in application settings

 

Function Principle

Operation ONH-ρ

The ELEMENTRAC ONH-ρ is simple and safe to operate. The samples are weighed on the interfaced balance and the weight is conveyed to the linked PC. Manual weight entry is also possible.

Based on the application, the sample has to be housed in a nickel basket or capsule. Granulates or pins made of steel can be positioned directly on the sample port without the need for any other tools. Certain applications require extra fluxes like nickel or tin which have to be provided in an empty graphite crucible. This graphite crucible is kept on the lower electrode tip and then the analysis begins. Typical analysis time is around 2.5 minutes.

All cell outputs and analyzer parameters are shown in real time and are saved in a data base together with the results. The results and application settings can be exported. The ELEMENTRAC ONH-ρ requires hardly any maintenance; all particle filters and chemicals which have to be maintained are easily accessible. During daily work, a door hides the filters and chemicals. It can be removed easily to observe these during analysis.

Measuring Principle ELEMENTRAC ONH-ρ

The measuring principle of the ELEMENTRAC ONH-ρ allows for a wide measuring range. To test the sample, it is weighed and kept on the sample port. Flushing with carrier gas prevents atmospheric gas (nitrogen and oxygen) from entering into the furnace.

The graphite crucible is outgassed in the impulse furnace to decrease possible contaminations such as residual hydrogen. After a stabilization phase, the sample is placed into the crucible and melts. Carbon monoxide is generated by the reaction of carbon in the graphite crucible and oxygen of the sample. Hydrogen and nitrogen are emitted in its elemental form. The carrier gas (helium) and sample gasses travel through a filter before entering a copper oxide catalyst which changes the CO to CO2.

The CO2 is measured using the infrared cells to establish the oxygen content. Water and CO2 are removed chemically and the nitrogen quantity is measured in the thermal conductivity cell. In the case of hydrogen analysis, the nitrogen carrier gas and the sample gas pass via a Schuetze reagent instead of a copper oxide catalyst. As an option the more economical Argon can be used to establish the nitrogen and oxygen content.

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