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 Ã‚Â°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-pby a robust and sensitive thermal conductivity cell.
alloys, cast iron, ceramics, copper, refractory metals, steel, ...
|Measured elements||hydrogen, oxygen|
|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|
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.
Subject to technical modifications and errors