Nitrogen analyzer

1

Principles and Applications

The nitrogen in metal and non-metal solid materials is detected using the principle of inert gas melting. In the determination of nitrogen, the weighed sample is placed in a graphite crucible and melted by high-temperature heating in a helium gas flow. The nitrogen in the sample escapes in the form of nitrogen gas, which is sent to the converter by helium gas and does not react. Carbon dioxide in the mixed gas after passing through the converterCO2After adsorption, the remaining mixture of nitrogen and helium gas is detected through a thermal conductivity detection cell. Quickly and accurately determine the nitrogen content in steel, cast iron, alloys, copper, zirconium, titanium, refractory materials, rare earth materials, and other inorganic substances.

2

analysis scope

Low nitrogen:0.0001%～0.5％； High nitrogen:0.5％ ～40%

Changing the sample size measurement range can expand to100%

3

accuracy of analysis

Nitrogen:RSD≤1%

Note: The standard deviation or uncertainty shall not exceed the sample standard deviation.

4

sensitivity

0.01ppm

5

analysis time

generally3minute

6

detection system

Nitrogen analyzerAdopting a high-precision thermal conductivity detection system.

7

High precision thermal conductivity detection system

Adopting a high-sensitivity thermal conductivity detection cell, the cell current is continuously adjustable, and a high-precision amplifier is used24bitA/DThe sampling card and other hardware ensure the determination of nitrogen content from ultra-low levels to large ranges. Adopting low drift,high precision,large range,High sensitivity thermal conductivity detector has a low failure rate,Strong reliability,Good stability.

8

sample weighing

0.01-1gThe sample size can be adjusted according to the sample content

9

pulse furnace

1Current0～1500A, Power:10KVAThe highest temperature is higher than3500℃。

2The pulse electrode furnace has a high heating temperature and uses program-controlled power. It can provide various program-controlled heating methods such as constant power heating, slope heating, and segmented heating to improve analysis accuracy. Suitable for rapid analysis of low melting point materials such as aluminum alloys to high melting point materials such as tungsten alloys. The electrode is suitable for various types of crucibles, and according to the release situation of different samples, various crucibles including sleeve crucibles and high-temperature crucibles can be selected to effectively reduce the user's operating costs. The electrode cooling system adopts a single cycle independent cooling system, which can be directly connected to circulating water or external water cooling devices, and has the characteristics of good cooling effect and high reliability.

10

air circuit

1High nitrogen and low nitrogen can be selected through settings;

2Adopting an integrated whole machine design, the space is spacious, and the connection routes of the pneumatic system are greatly reduced, making the pneumatic system of the whole machine more concise and reliable. The pneumatic components, including solenoid valves, cylinders, pneumatic pipes, and pneumatic joints, all use imported components, and the lifespan of solenoid valves exceeds one million cycles. The dual axis guiding cylinder of the lifting system ensures smooth lifting and lowering of the electrode, ensuring good contact between the graphite crucible and the upper electrode, while also ensuring uniform force on the graphite crucible, which is conducive to long-term high-temperature heating. The automatic feeding furnace head with air curtain protection and automatic air blowing mechanism effectively ensure the accuracy of nitrogen element analysis. The furnace head has a split structure,The upper and lower electrodes are easy to disassemble,Easy to replace,And the lower electrode is made of high-temperature alloy material,Long service life and low usage cost.

3The design of the injection system adopts an open approach,Its advantage is that pollutants are discharged from the furnace top,Do not enter the system,easy to operate,Low requirements for system sealing.

11

Power gas

Nitrogen or anhydrous oil-free compressed air

12

correction

1Single point calibration: calibrate with the results of one analysis

2Multi point calibration: using multiple analysis results for calibration

3Blank correction

13

power supply

Pulse furnace power supply:220VAC±10%，50±1Hz, maximum current50A.Other power supplies:220VAC±10%，50±1Hz, maximum current10A.Circulating water power supply:220VAC±10%，50±1Hz, maximum current16A.

14

Software features

1ProvideWindowsSoftware in the environment that quickly displays analysis results and curves;

2Automatic storage of analysis results;

3The sample weight is automatically inputted into the software;

4High nitrogen and low nitrogen can be selected through settings;

5Dynamic release curve drawing and storage, unloading;

6Multiple calibration modes for analysis results, which can be manually calibrated or calibrated through analysis results;Can be calibrated at a single point or multiple points;

7Filter the data, calculate the average, standard deviation, relative deviation, etc;

8The new software can design several calibration lines according to user applications, greatly facilitating user use;

9The host can be connected to computers, printers, electronic scales, etc. to achieve data transmission;

10The analysis time and blank value can be adjusted, and the blank value of the melting aid can be automatically removed;

11Users can store several analysis methods for different analysis samples.

12Can store a large number of sample weights (limited only by the computer's hard drive capacity).

13Can output result reports in a regular format.

14It can be connected to user databases to achieve remote transmission of analysis results, making it easy to implement networked management of analysis results.

15Can quickly perform instrument blank measurement.

16Can store and edit sample numbers.

17Can be applied to automatic sampling to achieve automated operation of instruments.

18Nitrogen has any high-low analysis channel to meet the analysis requirements of different materials with different contents. Users can freely combine and use according to their actual needs.

15

Instrument Features

1Maximum power of water-cooled transformer and pulse furnace10KwThe advantages are small size, good heat dissipation effect, and stable power output.

2Dual axis guided integrated cylinder，Ensure smooth lifting and lowering of the electrode, ensure good contact between the graphite crucible and the upper electrode, and ensure uniform force distribution of the graphite crucible, which is conducive to long-term high-temperature heating；

3The whole machine adopts a modular and integrated design, with four independent modules including pulse electrode furnace, gas system, circuit system, and detection system integrated into one main unit, with a simple and elegant appearance；

4The full range linear calibration technology, combined with weight linear compensation, pressure, flow rate, temperature compensation, etc., ensures the analysis accuracy of unknown samples from low to high content within the full range.

16

Factory Inspection

Instrument inspection and calibration certificate