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Eltra - Oxygen/Hydrogen Analyzer - ELEMENTRAC OH-p

The ELEMENTRAC OH-p determines oxygen and hydrogen in inorganic samples by inert gas fusion in an impulse furnace with temperatures in excess of 3,000 °C.

The ELEMENTRAC OH-p guarantees precise and fast sample analysis. The analyzer covers a wide range of applications such as metal,ceramics and other inorganic materials.

The ELEMENTRAC OH-p can be supplied with up to two infrared cells with different path lengths, accommodating both high and low level oxygen analyses. Hydrogen concentrations are determined in the ELEMENTRAC OH-p by a robust and sensitive thermal conductivity cell.

Application examples

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

Function principle

Operation ELEMENTRAC OH-p

Operation of the ELEMENTRAC OH-p is simple and safe. The samples are weighed on the interfaced balance and the weight is transferred to the linked PC. Manual weight entry is also possible.

Depending on the application the sample has to be placed in a nickel basket or capsule. Granulates or pins made of steel can be placed directly on the sample port without any other tools. Some applications also require additional fluxes like tin or nickel, which have to be filled into an empty graphite crucible. This graphite crucible is placed on the lower electrode tip and the analysis can be started. Typical analysis time is about 2,5 minutes.

All cell outputs and analyser parameters are displayed in real time and are saved in a data base along with the results. Of course the results and application settings can be exported. The ELEMENTRAC OH-p requires minimum maintenance and all filters and chemicals which need to be maintained are easily accessible. During daily work a door hides chemicals and filters. It can be removed easily to observe these during analysis.

Measuring Principle ELEMENTRAC OH-p

The measuring principle of the ELEMENTRAC OH-p allows for a wide measuring range. To analyze the sample, it is weighed and placed on the sample port. Flushing with carrier gas prevents atmospheric gas (oxygen) from getting into the furnace.

The graphite crucible is outgassed in the impulse furnace to reduce possible contaminations (e.g. residual hydrogen). After a stabilization phase the sample is dropped into the crucible and melts. Carbon monoxide is produced by the reaction of carbon in the graphite crucible and oxygen of the sample. Hydrogen is released in its elemental form. The carrier gas (nitrogen) and sample gasses pass through a filter before entering the Schuetze reagent which converts the CO to CO2, whereas hydrogen stays in its elemental form.

The CO2 is measured by the infrared cells and removed chemically.  Afterwards the hydrogen content is determinated in the thermal conductivity cell.

Technical specification

Measured elements hydrogen, 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 hydrogen
Typical analysis time 120 - 180 s
Chemicals required magnesium perchlorate, Schuetze reagents, sodium hydroxide
Gas required compressed air, nitrogen 99.995 % pure, 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 0.0001g), monitor, PC
Optional accessories carrier gas purification, external chiller, gas calibration unit

*Limited to 6.8 kw in application settings

Key features

  • Simultaneous oxygen/hydrogen determination with inert gas fusion technique
  • NEW: closed gas management and optimized gas circulation for sensitive OH determination
  • NEW: enlarged Schuetze Reagent tube for precise oxygen measurements
  • NEW: gas flow system with electronic gas flow control and new leakage test
  • NEW: water-cooled sample port system for effective removal of atmospheric gases
  • Flexible configurations and measuring ranges for O and H
  • High sensitivity IR and TC cells with low detection limits
  • Short analysis time
  • Rapid, precise, accurate and reliable element determination
  • Powerful 8,5 kW* impulse furnace for temperatures in excess of 3,000 °C
  • Economic analysis of grains without capsules
  • NEW: chemicals and tubes are hidden behind a door (removable)
  • NEW: powerful software supporting data and application export, with comment fields
  • Single and multipoint calibration (linear regression)
  • NEW: cooling via tap water, heat exchanger or chiller
  • New design allows operation in production control and laboratory
  • Construction
  • Machinery & Manufacturing
  • Mining & Minerals
Eltra GmbH

ELTRA is a specialist for elemental analyzers for the accurate and rapid analysis of solid materials. ELTRA equipment is a standard for elemental analysis in industries such as mining, steel, energy, cement and metal working.

ELTRA analyzers are used to reliably determine elements like carbon, hydrogen, sulfur, oxygen and nitrogen, and cover a wide, dynamic measuring range. The ability to adapt each analyzer to user specifications allows the precise measurement of a great variety of organic and inorganic samples in a multitude of applications.

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