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.
提供各种无机材料、钢铁、有色金属、硬质合金、陶瓷材料中宽范围的氧氮氢同时分析。广东美国LECO氧氮氢分析仪厂家报价
Procedure – Powder/Chip Samples
Instrument calibration/drift correction.
Add approximately 0.05 g of *** Graphite Powder to a***Graphite Crucible.
Firmly place the crucible on the lower electrode tip or appropriate autoloader position.
Press the Analyze button on the instrument screen,the lower electrode will close and the analysis sequence will start and end automatically.
Repeat steps 3b through 3i a minimum of three times for each calibration/drift standard used.
广东美国LECO氧氮氢分析仪厂家报价***电极炉头设计，提高脉冲炉热交换效率。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.
Oxygen, Nitrogen, and Hydrogen in Refractory Metals
Summary
One of the most critical chemical specifications of titanium alloys is the hydrogen content. Too high of a
hydrogen content can cause hydrides to precipitate, which can lead to embrittlement and subsequent
cracking when the alloy is stressed. Hydrogen pickup typically occurs during downstream processing steps
such as heat treating, pickling, and cleaning.
The LECO ONH836 is a simultaneous oxygen, nitrogen, and hydrogen determinator that utilizes an electrode furnace, inert carrier gas, and both infrared and thermal conductivity detection to meet the analytical needs of the refractory metal industry.
This application note was written specifically for use with the LECO ONH836 series determinator.
仪器的亮点和优势：
特点和优势
·炉头区域LED照明系统
·炉头快速拆装的粉尘过滤装置
·装有自动旁路阀的可快速拆装氧水捕集装置
·**的动态流量补偿（DFC）保证热导池气体流量、压力恒定
高效脉冲炉冷却系统
·强力内循环水冷装置热交换效率
·双直流风扇保证持续冷却，不受电压波动的影响
·***电极炉头设计，提高脉冲炉
全自动分析系统（可选）
·自动清扫装置
·20位或100位全自动分析系统
·高效全自动真空除尘装置直接将粉尘排至仪器外部捕集器中，消除环境污染
改进的红外检测池技术
·***红外池的恒温绝热技术消除了外界环境温度的干扰
·长寿命的红外发射光源和无漂移的电路设计保证红外检测池的长期稳定性
·氧高低双量程采用3个碳红外检测器同时检测一氧化碳和二氧化碳，保证准确定量 国际**的非色散红外及热导检测器 ，无移动部件，不需要手动调整。上海美国分析仪采购
试样加载过程中完全密闭，消除大气的中可能带来的杂质的污染。广东美国LECO氧氮氢分析仪厂家报价
User-Friendly Brand Software Cornerstone
LECO's exclusive brand software enables the user to have complete access to analysis Cornerstone control, method settings, diagnostics, reporting, and more in a highly organized and immersive environment. Designed through a collaboration of customer feedback and innovative engineering,Cornerstone allows the user to conduct all of their day-to-day operations within a single Analysis screen designed for speed and ease-of-use. Our innovative grouping of sample data into sets and replicates simplifies the data output and automatically calculates relevant statistics, alleviating the need for additional data processing.
广东美国LECO氧氮氢分析仪厂家报价
