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Nanyang Zhongtong explosion-proof professional production: explosion-proof positive pressure cabinet, positive pressure explosion-proof distribution cabinet See more

frequently asked questions

If you have any questions about Zhongtong explosion-proof positive pressure cabinet, you can find the answer in our FAQ list!
If you have any other questions about Zhongtong explosion-proof positive pressure cabinet, please contact Tel: 400-718-6669 Answer for you!
  • What is positive pressure explosion-proof electrical control cabinet?

    The positive piezoelectric cabinet is to fill the electric cabinet with air or nitrogen. The protective gas must be in the direction of leakage, so that the electric cabinet always exists in the state of slight positive pressure, so as to prevent other substances, flammable and explosive gases from entering the cabinet. So as to play the role of explosion-proof protection.

  • What is the inspection standard of positive pressure fume hood in oil field? Is there a national standard?

    GB 3836.5-2004 electrical equipment for explosive gas environment Part 5 positive pressure enclosure type "P" standard shall be implemented.

  • The control cabinet is explosion-proof. Do the electrical components inside need explosion-proof?

    Each component is explosion-proof, and then constitutes an explosion-proof system. You have a lot of equipment, this method is basically not feasible, or the cost is too high.

    Each element should be of ordinary type and placed in a positive pressure explosion-proof control cabinet, which can also meet the explosion-proof requirements of zone 2.

  • What is the positive pressure explosion-proof cabinet?

    The explosion-proof type of electrical apparatus is mainly used to discharge the explosion-proof gas into the outer part of the electric appliance, so as to ensure the safety of the product.

    The positive pressure explosion-proof control cabinet can make the clean air in the control cabinet and keep the positive pressure, so that the combustible gas can not enter the cabinet, so as to achieve the explosion-proof purpose.

  • Can PLC control cabinet be made into explosion-proof cabinet?

    Yes, PLC control cabinet can be made into explosion-proof, that is to say, a positive pressure cabinet should be filled with fresh air or inert gas to keep the pressure inside the cabinet higher than that outside, so as to prevent the combustible gas from entering.

    Generally, the first thing to work is to re air the positive pressure cabinet.

  • The place that uses explosion-proof fume hood, need not explosion-proof design again?

    This problem, you need to know the design requirements, that is, the insurance plus insurance (not very accurate, the general idea is that you have explosion-proof cabinet, also need to have explosion-proof place, this is because, once the explosion occurs, beyond the explosion-proof cabinet can bear the force, it will produce force on the outside world, and may cause damage, so, the place where the explosion-proof cabinet is placed must have explosion-proof measures.

  • How to select fan for air source of positive pressure explosion proof cabinet?

    In general, due to good sealing performance and less leakage, compressed air is generally used as the gas source of positive pressure control cabinet, so the air source is required to be 0.4 ~ 0.6MPa fresh compressed air. Therefore, it is not appropriate to select fan as the air source. Firstly, the pressure cannot be reached, and secondly, the flow is too large and waste. The most appropriate choice is to directly use the compressed air for field instruments (if there is one on site) Or purchase a small air pump, model size can be determined according to the size of the cabinet and sealing.

  • How to choose explosion proof cabinet correctly?

    The explosion-proof cabinet plays an important role in the production of dangerous products in the industry. So, what aspects should users pay attention to when choosing explosion-proof cabinet to choose explosion-proof cabinet with good quality? According to the support of users, Zhongtong shares the selection of explosion-proof cabinets for users.

    The following points should be paid attention to when selecting explosion-proof cabinet with good quality:

    1. Security. Safety should be the first consideration when choosing explosion-proof cabinet. Installing it equipment for key tasks into a lockable explosion-proof positive pressure cabinet will make network administrators feel more relaxed, which also limits the number of people who can open the explosion-proof positive pressure cabinet;

    2. Heat dissipation. Estimate the calorific value of your equipment. Generally speaking, there are two or four fans on the top of the cabinet. The more fans are, the better. The side wall fan should be installed on the back wall of the explosion-proof positive pressure cabinet, because the rear of the equipment generates most of the heat. Generally speaking, the heat dissipation effect of large capacity explosion-proof positive pressure cabinet will be better;

    3. Layout. The layout of explosion-proof box and cabinet is also very important for its later use. Generally speaking, there are many baffles and heat dissipation holes. Some iron sheets used to fix the cable should be wrapped to prevent damage to the cable;

    4. Price. The price is always the key consideration when the user chooses the commodity. Therefore, the price of the explosion-proof cabinet has certain reference value for the user's choice. When choosing explosion-proof box and cabinet, users should choose explosion-proof box and cabinet with good cost performance, instead of blindly coveting explosion-proof box and cabinet with low price.

    At present, there are many manufacturers producing explosion-proof boxes and cabinets in the market. When choosing explosion-proof boxes and cabinets, users should consider comprehensively from various aspects instead of following the one-sided words of sales personnel of explosion-proof boxes and cabinets.

  • Inspection standard of explosion proof positive pressure cabinet?

    What you are talking about is positive pressure explosion-proof equipment, check gb3836.5.

  • How to calculate the shell thickness of explosion-proof control cabinet?

    Generally, the shell thickness of explosion-proof cabinet is more than 4mm. There is no fixed calculation formula and no material limitation. As long as the hydraulic test, explosion transmission test and explosion-proof performance can be tested.

  • Why does positive pressure explosion proof cabinet need observation window? When is it necessary?

    Positive pressure explosion proof cabinet needs observation window? I haven't heard of it. From gb3836.5 positive pressure explosion-proof point of view, there is no requirement to have an observation window, the observation window is the functional requirements of the cabinet itself!

  • How to determine the maximum pressure of positive pressure explosion-proof cabinet?

    The national electrical explosion-proof standard gb3836.5-2000 has provisions for positive pressure explosion-proof low-pressure, and the minimum pressure shall not be less than 50pA.

  • How to deal with air leakage at the incoming end of electric cable in positive pressure explosion proof cabinet?

    That is your cable and cable connector does not match, or installation is not standard.

    1、 There are several reasons for air leakage

    1. The cable joint and positive pressure cabinet body are not well installed and have leakage.

    2. The cable joint and cable are not pressed tightly and there is leakage.

    2、 Change method:

    1. The installation of cable joint and positive pressure cabinet should be kept tight, and there is a sealing gasket in the middle. If the compression amount of the sealing gasket is small or uneven, it is necessary to replace the sealing gasket.

    2. Cable joint has cable compression range, whether it matches with cable? If it doesn't match, replace the cable connector. Measure the outer diameter of the cable, select the cable joint, and there is a suitable cable outer diameter on the joint.

  • Can the distribution cabinet in explosion-proof area use positive pressure ventilation type?

    sure. But clean air is needed as a source of air.

  • Can high purity nitrogen be used as positive pressure air source of cabinet?

    Yes, but the price of high-purity nitrogen is more expensive, the cost is higher, and it is more luxurious. Use fresh air for positive pressure air source!

  • Explosion proof positive pressure cabinet, positive pressure explosion-proof cabinet purchase need to pay attention to what matters?

    Pay attention to the purchase of explosion-proof certificate and explosion-proof electrical production license manufacturers.

  • How to identify whether the explosion-proof positive pressure cabinet is aging?

    To check whether the explosion-proof cabinet is aging, the following aspects can be inspected:

    1. Check the ex factory date of the explosion-proof cabinet, calculate the used time of the explosion-proof cabinet, and calculate whether the explosion-proof cabinet is aging according to the service life of the explosion-proof cabinet;

    2. Test the insulation capacity of the explosion-proof cabinet. If it is found that the insulation capacity of the explosion-proof cabinet becomes poor, it indicates that the explosion-proof cabinet may have been aging;

    3. Observe the surface of the explosion-proof cabinet. After long-term use, the surface of the explosion-proof cabinet may have damaged insulation protection layer and loose connection points, which also indicates that the explosion-proof cabinet has aging phenomenon, and it is better to stop using it;

    4. Pay attention to whether the explosion-proof cabinet emits odor during use. If in the process of using explosion-proof cabinet, can smell abnormal smell, then, this is also one of the signs of explosion-proof cabinet aging;

    5. Observe the environment of the place where the explosion-proof cabinet is used, especially the temperature, humidity and chemical corrosion degree of the environment to judge whether the explosion-proof cabinet is aging or not.

    The aging of explosion-proof cabinet is not a big problem, but once the problem of explosion-proof cabinet aging is encountered, it is likely to cause fire and other unnecessary accidents. Our company believes that when you use explosion-proof cabinet or explosion-proof air-conditioner, you must first check their quality problems. When you use explosion-proof cabinet, you should carefully check whether the explosion-proof cabinet is aging. If there is aging, you should deal with it as soon as possible.