廣東LECO分析儀廠家供應(yīng)

Sample Preparation

Typically, titanium and zirconium samples are chemically etched to remove surface contamination when oxygen and nitrogen are determined. However, etching can introduce hydrogen into the sample.

ASTM method E 1409 "Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert

Gas Fusion Technique", as updated in 1996, permits either etching or abrading (filing) of the test specimen.

ASTM E 1447 "Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal

Conductivity/Infrared Detection Method" permits surface preparation by abrading (if necessary to remove

contamination). Differences in sample preparation present somewhat of a dilemma regarding simultaneous

determination of O, N, and H in titanium. However, abrading samples with a file to remove surface

contamination will yield accurate O, N, and H results. The ONH836 utilizes a high-power electrode furnace to quickly and efficiently release the target gases from within the sample, which allows for a very rapid simultaneous determination of oxygen, nitrogen, and hydrogen.

Instrument calibration/drift correction.

a. Login a minimum of 3 Standard replicates.

b. Weigh a ~1.000 gram of a calibration/drift standard, enter the mass and standard identification into appropriate replicate fields.

c. Press the Analyze button on the instrument screen. After a short delay, the loading head slide-block will open.

d. Place the calibration/drift standard into the open port at the top of the loading head.

e. Press the Analyze button on the instrument screen again, the loading head slide-block will close and the lower electrode will open.

山東LECO氧氮?dú)浞治鰞x廠家直銷(xiāo)新型氣路管道減少氣路連接閥，使得漏氣，斷路故障更少。

氧氮?dú)浞治鰞x的操作過(guò)程

氧氮?dú)浞治鰞x可根據(jù)的用戶的要求定制。該分析儀配備兩個(gè)不同靈敏度的探測(cè)器，在更多的應(yīng)用中保證了準(zhǔn)確度。

操作簡(jiǎn)單而且安全。在樣品稱重以后，樣品的重量數(shù)據(jù)通過(guò)電子界面?zhèn)鲗?dǎo)至相連的電腦中，也可以在軟件界面中手動(dòng)輸入樣品的重量。

樣品被放置在水平放置的爐子中的低溫區(qū)域。分析開(kāi)始以后，爐子開(kāi)始向上轉(zhuǎn)動(dòng)，然后樣品逐漸落入加熱區(qū)。通過(guò)添加載體氣體氮?dú)?，氫氣被擴(kuò)散出來(lái)并且隨載體被傳導(dǎo)至一個(gè)高靈敏度的熱傳導(dǎo)測(cè)量池。

通常一次測(cè)量的時(shí)間在3到15分鐘之間。在分析的過(guò)程中設(shè)備可以顯示測(cè)試信號(hào)和設(shè)備的參數(shù)，從信號(hào)的評(píng)估到結(jié)果在界面上的顯示全部自動(dòng)完成；而測(cè)量數(shù)據(jù)則被傳導(dǎo)至LIMS（實(shí)驗(yàn)室信息管理系統(tǒng)）中。無(wú)需過(guò)多的保養(yǎng)和維護(hù)，而除塵器和凈化管的維護(hù)工作也方便。

Sample Preparation

Sampling and sample preparation is an important issue because traditional methods used to obtain samples for oxygen and nitrogen determination are different from those recommended for hydrogen, especially when sampling molten metal. The main difference in steel sampling procedures for oxygen/nitrogen and hydrogen is due to the mobilityof hydrogen. Special precautions must be used when sampling for hydrogen. From molten steel and iron, a sample must be quickly quenched in cold water and chilled in a refrigerant such as liquefied nitrogen or a mixture of acetone and solid carbon dioxide in order to reduce losses of hydrogen from diffusion. Losses of oxygen and nitrogen from diffusion are not a problem. A sample that is taken for hydrogen and

chilled in a refrigerant can also be used for oxygen and nitrogen determination. However, a sample that is typically taken for oxygen and/or nitrogen determination is not suitable for hydrogen determination due to hydrogen loss (diffusion). Surface contamination must be removed by filing or light grinding, using care not to overheat the sample.

氧氮?dú)浞治鰞x怎么選？歡迎聯(lián)系上海禹重科技，我司產(chǎn)品質(zhì)量保證，歡迎咨詢！

Procedure – Powder/Chip Samples

Determine the instrument blank.

Press the Analyze button on the instrument screen again, the loading head slide-block will close and the lower electrode will open.

Clean the upper and lower electrode either manually or remove the crucible and press the analyze button to clean with an automatic cleaner if applicable.

Add approximately 0.05 g of *** Graphite Powder to a 782-720 Graphite Crucible.

Firmly place the crucible on the lower electrode tip or appropriate autoloader position.

Cornerstone氧氮氧分析軟件允許用戶在單一分析界面中完成日常的所有工作，快速而且簡(jiǎn)單易用。廣東LECO分析儀廠家供應(yīng)

Procedure – Powder/Chip Samples

Instrument calibration/drift correction.

Press the Analyze button on the instrument screen. After a short delay, the loading head slide-block will open.

Place the Nickel Capsule containing the sample into the open port at the top of the loading head.

Press the Analyze button on the instrument screen again, the loading head slide-block will close and the lower electrode will open.

Clean the upper and lower electrode either manually or remove the crucible and press the analyze button to clean with an automatic cleaner if applicable.