Understanding Hydrogen Generators

Understanding Hydrogen Generators

Hydrogen generator is mainly composed of electrolysis system, pressure control system, purification system and display system. Hydrogen is generated by electrolysis of water, while oxygen is emitted into the atmosphere. It has the advantages of large electrolysis area, low bath temperature, good performance, large gas production and high purity.

Hydrogen has the characteristics of small molecular weight, large molecular radius, large thermal conductivity, and low viscosity. It is often used as a carrier gas in the detection and analysis of gas chromatographs. The function of the carrier gas is to send the gas sample or vaporized sample gas into the chromatographic column at a certain flow rate for separation, and then load the separated components into the detector for detection, and then flow into the chromatograph when the spectral system is vented or collected. Column, the carrier gas only plays the role of the carrier and does not participate in the separation. The commonly used method of hydrogen production is water electrolysis, and the instrument used is this product.

内页1What are the advantages and characteristics of hydrogen generators? 

1. Availability – Hydrogen can be obtained by electrolyzing water, and the generator can produce hydrogen on demand.

2. Low temperature separation – because the power of hydrogen is increased, the compound can be separated at a lower temperature, thereby shortening the operation time.

3. Speed ​​up – because the linear flow rate is accelerated, the operating time is shortened, and accordingly, the laboratory throughput is increased.

4. Column life is extended – the temperature is lowered, the loss of the chromatographic column is reduced, and the life of the chromatographic column is increased.

5. Additionally, hydrogen is a reducing gas that removes potential acid sites in the tower, further extending the life of the tower.

Existing Laboratory Uses Hydrogen is used in many applications in most gas chromatography laboratories, such as fuel gas as a widely used detector (FID). Choosing the right hydrogen supply for gas chromatography applications will improve the reliability of the system and the results obtained.

The hydrogen generator adopts a high-sensitivity, fuzzy automatic tracking control system, that is, gas is produced when there is gas, and no gas is produced when there is no gas, realizing automatic constant pressure and constant flow, so that the pressure stability and accuracy scale are less than 0.001mpa, ensuring high-purity output of hydrogen and stable pressure. , safe, continuous.

内页2Do you know the self-test steps before using the hydrogen generator?

In normal use of the hydrogen generator, attention should be paid to the addition of deionized water for general maintenance. The amount of each addition should not exceed the upper limit of the liquid level. The frequency of adding deionized water is related to the amount of hydrogen used and the ambient temperature.

The replacement of the discolored silica gel (desiccant) needs to be replaced when the bottom of the desiccant turns red, release the hydrogen, unscrew the desiccant cartridge as a whole (counterclockwise), and then replace it. Make sure that there is no desiccant attached to the rubber surface in the upper cover of the desiccant cartridge. After tightening, the desiccant cartridge is screwed on the drying base with moderate force and not too much.

Before using the hydrogen generator, you need to follow the following steps to self-check:

1. Turn on the power and tighten the sealing nut at the air outlet.

2. Turn on the power switch, the generator pressure begins to rise, check the electrolysis indicator on the instrument panel, it should be green, and the flow indicator should be around 300 (500). The pressure of the instrument should reach 4Kg/cm2 (about 0.4MPa) within 8 minutes, the flow indicator should return to 000, and the electrolysis indicator light should be off. The above shows that the instrument system works normally and the self-test is qualified.

3. This method can also be used for self-checking in the future if air leakage is suspected in use.

Precautions in the use of zero-level air generators

Zero-grade air is a common gas mixture mainly composed of oxygen and nitrogen. Zero-grade air can use different methods to remove carbon dioxide and other trace impurities (such as hydrocarbons, moisture, nitrogen oxides, etc.) in dry air. )get.

内页3A zero-stage air generator is a device that purifies the air source by catalytically cracking the total hydrocarbons in the compressed air to produce zero-stage air below 0.1ppm hydrocarbons, in a heated catalyst containing a platinum-palladium carrier Hydrocarbons are converted into carbon dioxide and water vapor. The inside of the instrument adopts a silicone rubber ring (with low sulfur content), which can effectively improve the gas quality and ensure a stable chromatographic baseline.

1. In order to ensure the gas purity, the zero-level air generator needs to replace the activated carbon once every 1000 hours of operation (activated carbon is 20-40 mesh, pencil lead type);

2. During the working process, the compressor does not start, and the thermal protection relay starts, indicating that the temperature of the compressor is too high, and it will automatically return to normal after cooling;

3. The air inlet filter needs to be cleaned regularly (the cycle depends on the indoor dust conditions, and ultrasonic cleaning can be used) to keep the air intake smooth, otherwise it will easily cause the compressor to increase the workload and generate heat, and overheat protection will occur when the temperature is too high. cause downtime;

4. To observe the condition of the discolored silica gel from the observation window, the user can replace the new silica gel or dry it as needed; after replacing the discolored silica gel, the air tightness of the interfaces at both ends of the purification tube should be checked in time. Replace ferrule or purge tube.

5. Because the compressor of the air generator is an inductive load, the instantaneous current during power-on and power-off is several times higher than that during normal operation, and it is easier to fuse the insurance, so an 8A fuse should be used; hydrogen generator

6. Since the air generator compressor works in an open circuit, the lubricating oil will be discharged out of the machine with water, causing consumption. Therefore, add lubricating oil to the compressor properly after one year of use, and the oil filling port is next to the compressor outlet (or From the air intake), it is recommended to add 200 grams of No. 18 refrigeration oil.

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Established in 2011, Biometer Co., Ltd. has been focusing on one-stop-shop solutions for research, development and marketing of medical equipment and laboratory equipment products for various fields covering government departments, scientific research institutions, colleges, biomedicine, advanced material, chemical industry, environment, food, electronics and electrical appliances, etc. for more than 10 years. Our products include laboratory equipment, sterilizer and disinfection equipment, laboratory safety protection product, cold chain product, medical equipment, general analytical equipment, measuring equipment, physical test equipment etc. We also provide sterilizers and autoclaves of different models to meet the diversified requirements of customers.


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  • Post time: May-06-2022