ELTRA ELEMENTRAC ON-p2 type oxygen-nitrogen element analyzer with pulse furnace
ELTRA
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Field of application: rapid, simultaneous determination of oxygen and nitrogen from steel, cast iron, copper, zirconium, titanium, molybdenum, nickel, ceramics and similar inorganic samples.
Structure: the device consists of two units, the analyzer - which contains the high-performance furnace - and the cooler of the furnace.
The device is controlled by an external computer. Operation and data processing is performed by the "ELEMENT" software.
Operating principle: compared to carbon-sulfur analyzers, the difference is significant; the device uses helium (or optionally argon) as a carrier gas, and the sample is burned in a graphite crucible placed in a high-temperature (>3,000 °C) pulse furnace.
The sample to be analyzed is measured in a measuring vessel, and then poured into the sample receiving opening on the top of the furnace. The impulse furnace has automatic closing and opening. After the furnace is closed, the graphite crucible is degassed, and then the sample loaded in advance from above automatically falls into the burner crucible.
It is also possible to drop the sample into the jar manually.
In this analysis, the firing temperature can reach 3,000 °C, therefore active cooling of the furnace is also required, which is performed by the closed recirculation cooler (see later). The pneumatics of the furnace are operated by compressed air, similarly to the CS-i.
When analyzing a large series of steel samples, the furnace must be cooled very intensively. This can be done by the optional external recirculation cooler (cooling capacity of 5.9 kW).
More detailsGraphite crucible features:
The outer diameter of the graphite crucible: 12.65 mm, height: 24.35 mm. The uniquely designed sample insertion mechanism never clogs! Therefore, there is no need to use tin capsules, which have many advantages: you don't have to take into account the blind value caused by the capsule's material or the air trapped in it; the evaporation of the capsule material does not contaminate the gas system; so there is no need to spend on unnecessary maintenance; faster analysis, lower cost of consumables per measurement.
During the burning of the sample, the electrical conductivity of the graphite crucible is used. The crucible is clamped between two electrodes, then it is heated by passing a large current through the crucible.
The crucible is placed on the graphite tip placed on the lower electrode, which, thanks to the special design, moves the hot zone from the center of the crucible to the area where the sample is located.
The upper electrode of the device is also equipped with an insert that can be easily replaced by the user. The solution is very economical, there is no need to call the service to replace the insert!
From the furnace, the combustion products enter the analyzer through different filter/cleaning materials, passing through the individual channels, where infrared sensor(s) specifically sensitive to oxygen provide the signal to the processing unit. These cells are similar to those already known for CS analyzers.
Nitrogen is determined by special thermal conductivity measuring cells developed by ELTRA - with low noise, high resolution and wide measurement range. 
Carrier gas-saving mode
If no analysis is performed for a while, the device automatically switches to "gas-saving" mode. The amount of helium flowing through the system is then significantly reduced, the control of the gas system allows only enough carrier gas flow so that the system is not contaminated with laboratory air.
When a new analysis is started, the analyzer will be operational again very quickly, thanks to the minimal flow even during the measurement break.
If it is only a device suitable for measuring oxygen, it can be operated with high-purity (99.995%) nitrogen carrier gas for low oxygen!
Furnace cooling
Due to the high operating temperature, the furnace must be cooled after the measurement. This is done by a heat exchanger unit - separate from the analyzer. The heat exchanger prevents limescale in the tap water from entering the furnace. The advantages of the separate arrangement: the analyzer can be much smaller in size and weight thanks to the heat exchanger placed outside it.
The flow of tap water is controlled by a thermostat. The furnace's cooling water is supplied by a pump located outside the analyzer. The tank of the cooling system is made of stainless steel and is a very solid structure. The cooling system can be placed under the table, so it does not take up too much space in the lab. Due to its external location, the heat exchanger can contain a large mass of water (approx. 20 liters), so its temperature change will be small. Smaller error potential for water leakage inside the analyzer. A closed, recirculation system cooling unit (chiller) can also be requested for the device.
| Possible channels of the ELEMENTRAC ON-p2 analyzer for a 1 g sample: | |
|---|---|
| Low oxygen: | Manufactured for 0.1 – 200 ppm oxygen |
| High oxygen: | 10 ppm - up to 2 % |
| Sensitivity to oxygen: | 0.1 - 200 ppm oxygen, or in the 0.0 - 100% range |
| Accuracy for low oxygen: | ± 0.1 ppm oxygen, or ±1 % of the oxygen content |
| Accuracy for high oxygen: | ± 2 ppm, or ± 1 % of the oxygen content |
| Low Nitrogen: | Manufactured for 0.1 – 200 ppm nitrogen |
| High Nitrogen: | 10 pm - up to 2 % |
| Sensitivity to nitrogen: | 0.1 ppm nitrogen, or in the range of 0.0 - 100% |
| Accuracy for low nitrogen: | ± 0.1 ppm nitrogen, or ± 1 % of nitrogen content |
| Accuracy for high nitrogen: | ± 2 ppm or ± 1 % of nitrogen content |
ELEMENTRAC ON-p2 type oxygen-nitrogen element analyzer with pulse furnace:
| Specifications: | ELEMENTRAC ON-2p |
|---|---|
| ON-p2 analyzer with PC control, manufactured for 1-4 channels, pulse heating furnace, automatic furnace cooling, electronically controlled gas system. Consumables (jars, chemicals, calibration standards, etc.) must be ordered separately! Can be connected to an analytical balance or printer (options). | |
| Carrier gas for ON analysis: | 99.995% pure helium, 2 – 4 bar |
| Carrier gas for O analysis only: | 99.995% pure nitrogen, 2 – 4 bar |
| Operating gas: | compressed air 4 – 6 bar |
| Measuring time: | 120 sec (normally) |
| Filter materials: | CO2 trap; high purity sodium hydroxide |
| Water trap: | magnesium perchlorate |
| Catalyst: | platinum-based |
| Furnace performance: | 0 – 8.5 kW, (32 A, on two (!) phases) |
| Voltage: | 3 x 400 V / 50 Hz |
| Max. power consumption: | 8.5 kW |
| Weight: | approx. 161 kg |
Official Procedures:
ASTM:
| Official Procedure: | Description: |
|---|---|
| ASTM E 1019 | Determination of carbon, sulphur, nitrogen and oxygen content in steel, iron, nickel and cobalt alloys by various combustion and inert gas fusion techniques. |
| ASTM E 1409 | Determination of oxygen and nitrogen in titanium and titanium alloys by inert gas fusion. |
| ASTM E 1447 | Determination of hydrogen in reactive metals and reactive metal alloys by inert gas fusion, thermal conductivity or infrared spectrometry. |
| ASTM C 1494 | Determination of the mass fraction of carbon, nitrogen and oxygen in silicon nitride powder. |
| ASTM E 2575 | Determination of oxygen in copper and copper alloys by inert gas fusion. |
| ASTM E 2792 | Determination of hydrogen content of aluminum and aluminum alloys by inert gas fusion. |
DIN EN ISO:
| Official Procedure: | Description: |
|---|---|
| DIN EN ISO 10720 | Steel and iron - determination of nitrogen content |
| DIN EN ISO 15351 | Steel and iron - determination of nitrogen content (routine method) |
| DIN EN ISO 21068-3 | Chemical analysis of raw materials and refractory products containing silicon carbide. Part 3: Determination of nitrogen, oxygen and metallic and oxide components. |
ISO:
| Official Procedure: | Description: |
|---|---|
| ISO 17053 | Steel and iron - determination of oxygen |
| ISO 22963 | Titanium and titanium alloys - determination of oxygen |
DIN EN és DIN:
| Official Procedure: | Description: |
|---|---|
| DIN EN 3976 | Titanium and titanium alloys - determination of hydrogen content |
| DIN 54387 | Ceramics and Ceramic Materials - Chemical Analysis of Boron Carbide, Boron Nitride, Metal Borides and Elemental Boron |
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