Food grade nitrogen analyzer

GC-2020AFood grade nitrogen analyzerIt is a gas chromatograph developed by the company based on the detection requirements for O2, CO, and CO2 in the national standard GB 29202-2012 "Nitrogen for Food Additives". The detection limit is CO≤0.1ppm、CO2≤0.1ppm、O2≤0.01%、H2≤0.1ppm、CH4≤0.1ppm。

GB 29202-2012 "Food Safety Standard for Food Additives Nitrogen" is a mandatory food safety standard issued by the Ministry of Health on December 25, 2012 and officially implemented on January 25, 2013. This standard is applicable to nitrogen production from cryogenic air separation, pressure swing adsorption, membrane separation, and food additive nitrogen produced by small-scale nitrogen generators.

Zirconia solid battery is used as the detector for gas chromatography. The measured component oxygen in the sample is separated by a chromatographic column and enters the detector, generating corresponding chromatographic peak signals, which are then quantified using an external standard method.

GC-2020AFood grade nitrogen analyzerA chromatographic analysis instrument using zirconia solid electrolyte primary cells as detectors, specifically designed to analyze the content of trace amounts of hydrogen, oxygen, methane, and carbon monoxide in high-purity inert gases. With the characteristics of high sensitivity, high selectivity, and simultaneous analysis of multiple components in a single injection, a hydrogen flame ionization detector can be added according to user needs. It can also detect carbon dioxide and total hydrocarbons, making it a very practical instrument for gas production and use units. Main application: Used for laboratory testing of high-purity inert gases and real-time control of gas quality in gas production of air separation units. The high sensitivity of the instrument can effectively solve the analysis of hydrogen in neon and oxygen in argon.

1. Analyze standard gases

Before making the sample, it is necessary to calibrate the gas. Rotate the instrument's injection valve to the sampling position, open the calibration gas main valve clockwise, and open the pressure reducing valve. If there are bubbles discharged from the instrument's sample outlet, close the pressure reducing valve (see bubbles disappear). Rotate the instrument's injection valve to the injection position, and the workstation will automatically collect data according to the set collection data

2. Establish calibration curve

Quantitative calculation using external standard method

3. Sample analysis

When injecting the sample, pay attention to emptying the air in the sampling bag (if air enters, the peak will be relatively large), and then repeatedly replace the sample 3 times. After taking the sample, immediately clamp it with a spring clip. When injecting, insert the sampling bag into the instrument sample inlet, remove the spring clip, and rotate the sampling valve to the sampling position. Squeeze the sampling bag firmly for 10 seconds. There will be bubbles discharged from the instrument sample outlet. Rotate the injection valve to the injection position. The workstation automatically collects data and stops saving spectra according to the set collection time

[Precautions for Instrument Operation]

1. When using a six way valve for gas injection, the position of the six way valve must be stopped at two positions. The valve cannot be rotated to the middle position because the middle position is where the six way valve cuts off the carrier gas, which can easily cause damage to the thermal conductivity cell due to the lack of carrier gas.

2. When the zirconia detector needs to be turned off, nitrogen gas should be supplied for 1-2 hours.

After sales service

Product and service advantages:

1. Service engineers have received professional training in chemical analysis, instrument repair, and maintenance. They can maintain and repair various components to ensure that your equipment runs smoothly and can quickly solve your problems.

2. Timely: In case of any malfunction, we will answer your call and provide timely solutions to the problem.

3. Service: Zhongke Spectral Analysis Instrument provides high-quality services within its scope.

4. Flexible response time: timely on-site problem-solving after reporting repairs.

5. Online instrument problem solving.

6. There are free and irregular chromatography training courses every year. The content includes chromatographic principles, analysis, applications, technical instrument operation, troubleshooting, and maintenance.