Shenzhen Zhongnuo Testing Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
How to differentiate between gas explosion-proof certification and dust explosion-proof certification?
The gas explosion-proof certification and dust explosion-proof certification we commonly refer to are categorized based on the applicable locations of the equipment.
Explosion-proof equipment for various hazardous gas environments undergoes gas explosion-proof certification, while equipment for places with combustible dust is subjected to dust explosion-proof certification.
In explosion-proof certification, gases are classified as IIA, IIB, and IIC, while dusts are categorized as IIIA, IIIB, and IIIC. Their characteristics and environments vary, necessitating different explosion-proof protection measures for equipment. These two should not be mixed. Of course, some products are designed to meet both gas and dust explosion-proof standards during the certification process, allowing them to be used in both gas and dust environments. The explosion-proof certification certificate can also be identified by the explosion-proof symbol, indicating whether it is for gas or dust explosion-proof certification.
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Shenzhen Zhongnuo Testing Technology Co., Ltd. has long focused on the explosion-proof field, boasting extensive forensic experience and a skilled technical team in the current explosion-proof certification sector. With experienced explosion-proof electronic engineers, we offer services including explosion-proof design, reverse engineering, circuit evaluation, and rectification, to help businesses avoid pitfalls and facilitate their explosion-proof certification process.

Are intrinsically safe and flameproof types the same? Which one has a higher level?
intrinsic safety and explosion-proof types are two different types of explosion protection.
The general intrinsic safety protection type primarily achieves explosion prevention by limiting the energy of the equipment.
It is inherently safe, suitable for low-power products, handheld devices, etc.
Blowout protection primarily involves designing a blowout shell that can withstand explosions from the external environment.
Can withstand internal explosion without propagating to the external explosive environment.
Each explosion-proof type operates on its unique explosion-proof principle, but they are all essentially safe (intrinsically safe, increased safety).
Or, implement measures to isolate ignition sources, which can achieve explosion-proof performance.
Intrinsically safe types are categorized as ia, ib, and ic, suitable for explosion-proof zones 0/20, 1/21, and 2/22 respectively.
Explosion-proof types include DA, DB, and DC. DA is only suitable for fixed gas equipment equipped with catalytic sensors.
Most explosion-proof products adopt the db protection type, suitable for Zone 1.
The " intrinsic safety" models can be used in 0/20 zones, offering a wider application range.
But within the same explosion-proof zones, such as Zone 1, both intrinsic safety and flameproofing can achieve the same explosion-proof performance; there is no concept of a higher-grade method.
Content above shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.

Essential safety primarily focuses on limiting energy in the circuit, reducing potential spark energy below the level needed to ignite the specified gas mixture. At the same time, the surface temperature of the wires and components is also kept below the ignition temperature of the gas mixture, thereby achieving intrinsic safety.

What documents are required to apply for an explosion-proof certification?
1. Product Drawings and Documents: When applying for a防爆 certification for intrinsically safe electrical equipment, the applicant should provide assembly drawings, circuit diagrams, printed circuit board layouts, silk-screening diagrams, material lists for components, and label drawings, among others. For non-intrinsically safe electrical equipment, the technical documents submitted for inspection should include drawings that reflect the sample's explosion-proof performance (including assembly drawings and component drawings). If the assembly drawing clearly indicates the product's explosion-proof parameters and structure, only the assembly drawing needs to be submitted for inspection.
2. Technical Documentation: Includes company standards/technical requirements. The company standards/technical requirements for the products should be written in the specified format, and their content should include not only the performance requirements of the product but also relevant aspects of explosion-proofness: such as basic parameters, explosion-proof markings, environmental conditions for use, explosion-proof performance requirements, relevant tests for explosion-proof performance, and markings related to explosion-proofness.
3. Additional Information: For products with adhesive bonding or casting, please provide the型号名称 (model name) and specifications of the adhesive and casting materials, along with performance descriptions and relevant process documents. For plastic shell products, include the material of the plastic and corresponding performance documents. Battery-operated products require the provision of battery specifications.
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