Intelligent oxygen nitrogen hydrogen combined analyzer - Pinyan Instrument

Intelligent oxygen nitrogen hydrogen combined analyzer - Pinyan InstrumentUsing a pulse furnace to heat a graphite crucible to achieve a temperature ofFrom 2000 ℃ to 3000 ℃, nitrogen is released from the sample, while oxygen combines with carbon in the graphite crucible to form CO andCO₂The oxygen was measured and utilizedCO₂in4.26mmIt has the characteristic of strong absorption band, and the change in light intensity after gas absorption is measured, analyzeCO₂The percentage content of gas concentration indirectly determines the percentage content of oxygen in the tested sample.

The analysis room includes an infrared light source, a reflector, a modulation disk, an absorption cell, a filter, and a detector. Infrared light source heated by electricity800The infrared radiation generated at around ℃ is modulated by a modulator to produce an optical signal80HzThe alternating radiation signal is incident on the absorption cell, and the infrared light passes through the absorption cellCO₂After the gas is absorbed, it is filtered by a narrowband filter to remove the energy of other light radiation outside the wavelength mentioned above. When it is incident on the detector, what is measured on the detector isCO₂The light intensity corresponding to the gas concentration is converted into an electrical signal by a detector and amplified to output an analog signalAfter A/D analog-to-digital conversion, it is normalized and integrated to invert the percentage content of oxygen element.

The oxygen nitrogen hydrogen combined measuring instrument uses the principle of thermal conductivity detector to detect the percentage of nitrogen content by detecting the different heat carried away by nitrogen and helium on different bridge arms of the thermal conductivity detector.

The analysis process is as follows: first, weigh the sample on an electronic balance, input it into a microcomputer, or enter it through a keyboard. After adding the flux, feed it into the sample adding mechanism, and start the analysis. The first stage is the degassing stage. First, open the corresponding solenoid valve and follow the analysis process to pass the carrier gas, with the aim of removing oxygen from the graphite crucible. WhenCO₂After stabilizing, enter the second stage; The second stage is the analysis and release stage. At this time, the sample adding mechanism is opened, and the tested sample falls into the graphite crucible. The sample is heated to the release temperature, and at this time, oxygen and carbon in the graphite crucible generate CO andCO₂Gas is transported from the carrier gas to the absorption cell, and the output signal of the amplifier decreases with the increase of the measured gas concentration. After normalization, each data is linearized and calibrated. After analysis, the area integration, multiplication coefficient, and blank deduction of the linearly calibrated data are performed to obtain the percentage content of oxygen and hydrogen elements in the sample. The percentage of nitrogen released from the sample was detected by a thermal conductivity detector.

technical indicators

analysis scope

Oxygen: 0.00001% to 40%

Nitrogen: 0.00001% to 40%

Hydrogen: 0.00001~0.2%

Note: Changing the sample size can alter the measurement range

accuracy of analysis

Oxygen and nitrogen: RSD ≤ 1%

Hydrogen: Standard sample: 0.2ppm or 2%

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

Sensitivity: 0.01ppm

Analysis time: usually 3 minutes

Sample weighing: Generally 1g, the sample weight can be adjusted according to the sample content.

Pulse furnace: current 0-1500A, power: 10KVA, maximum temperature above 3500 ℃. Multiple program heating methods: constant power heating, slope heating.

Carrier gas: High purity helium 99.999%

Power supply: 220VAC ± 10%, 50/60Hz, maximum current 50A

Intelligent oxygen nitrogen hydrogen combined analyzer - Pinyan Instrument

1. Laboratory area: approximately 10m2.

2. Laboratory environment: Instrument storage temperature: -15 ℃~40 ℃

Laboratory temperature during instrument operation:20 ℃~25 ℃ (requires air conditioning installation) No significant vibration felt by the human body, no strong magnetic field interference

3. Humidity: ≤ 80%

4. Air cleanliness: ventilated, dust-free, and free of corrosive gases.

5. Raw gas: helium: purity 99.995% (high-purity argon or nitrogen can be used when only measuring oxygen)

6. Power gas: nitrogen or compressed air without water or oil.

7. Power supply: Voltage: 220V ± 10%, frequency: 50Hz, fluctuation ＜ ± 2% (if the voltage is unstable, overvoltage and undervoltage protection devices should be installed in areas). At the same time, the power supply is two sets, different phases; one provides 50 A current for the pulse heating furnace; Connect another external single-phase socket and prepare a set of multiple sockets for the computer, with a maximum current of 10A; both power sources need to be grounded

8. Ground wire: individual ground wire:, ground resistance<5 ohms. Zero volts to ground voltage. Cannot share the ground wire with other instruments, nor can it be connected to the neutral wire of the power supply.

9. Cooling water: 4-6L/min (tap water pressure, above 0.25Mpa, good water quality, low hardness, faucet can be connected to a 10mm water pipe, with a drainage tank). Alternatively, choose an independent external water cooling device.

10. The user needs to bring their own set of experimental platform, where they can place the analysis host, computer, printer, and electronic balance.