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 apply for an explosion-proof certification for a modular equipment?
There is an increasing number of modular equipment used in explosion-proof areas, achieving more complex functions. In response to the technical requirements for explosion-proof certification of such equipment, ZN Testing has summarized years of industry experience, primarily including the following points:
(1) Explosion-proof performance is only considered for the electrical components, including installation and connection between electrical parts, grounding, etc., without considering the steel structure part.
(2) Electrical components must be purchased and installed with a防爆 certification or a防爆3C certificate. If suitable explosion-proof electrical components cannot be obtained, consider using explosion-proof/positive pressure methods for installation.
(3) The explosion-proof marking of the selected explosion-proof electrical components must not be lower than the explosion-proof marking grade of the entire machine.
(4) Explosion-proof electrical components must be installed, electrical connections, grounding, etc., in compliance with standard requirements.
In the field of obtaining certifications for modular equipment, ZhongNuo Testing boasts a technical team and industry experience capable of providing guidance on explosion-proof designs such as positive pressure and explosion-proof.
Guide clients in selecting electrical equipment, installation, preparation of technical drawings and documentation.
Engineers can be dispatched for on-site inspections to reduce the client's cost and time for evidence collection.
Successful certification cases include robots, AGV carts, industrial ovens, high and low-temperature chambers, filling machines, dosing machines, mobile fueling units, chemical storage cabinets, dust removal equipment, etc.
Need this? Feel free to DM us for further discussion!

Why choose tempered glass for explosion-proof transparent parts?
Transparent components are an important material for explosion-proof electrical equipment. When selecting transparent components, customers always ask what material should be used? Can glass be used? Can plastic be used?
Below, Shenzhen Zhongnuo Testing Technology Co., Ltd. explains it for everyone.
GB/T3836.1 explicitly stipulates the thermal shock test for transparent components, which is designed to verify the thermal stability of glass under rapid cooling conditions. Currently, tempered glass is a material that not only meets this requirement but also offers high cost-performance.
普及 the fact that tempered glass, after being heated and quenched, forms a uniform layer on the surface
The compressed stress layer counteracts the tensile stress generated on the surface during rapid cooling. Therefore, even when subjected to stress from rapid cooling, qualified tempered glass will have a compressed stress layer to offset its effects.

Which explosion-proof rating, Ex db eb or Ex db, is higher?
Composite explosion-proof marking indicates that a single explosion-proof type is not sufficient for this product and two or more explosion-proof types must be employed.
For example, explosion-proof equipment with antennas, the antenna section is usually intrinsically safe, making this device both explosion-proof and intrinsically safe.
Keep it up! Generally, the nozzle part falls under Zone 0 and can only be made as Intrinsically Safe IA. Other parts can be made into Zone 1, suitable for Intrinsically Safe Ib or explosion-proof types.
Composite explosion-proof products do not necessarily mean that the product must meet all requirements of different explosion-proof types simultaneously.
It's not that the explosion-proof grade of a composite explosion-proof type is necessarily higher than that of a single explosion-proof type.
The primary factor in determining the explosion-proof level of a product is the gas/dust combination, temperature class, and equipment protection level.
Gas Mixture: ⅡC > ⅡB > ⅡA
Dust Composition: ⅢC > ⅢB > ⅢA
Temperature Grades: T6 > T5 > T4 > T3 > T2 > T1
Equipment Protection Combination: Ga > Gb > Gc, Da > Db > Dc
For more details, please contact Shenzhen ZhongNuo Inspection & Technology Co., Ltd. directly!

Which certifications are the ATEX certification and the IECEx certification from?
ATEX certification is the mandatory certification for explosion-proof products in the EU, a type of explosion protection directive under the CE mark, applicable to the EU and its regions.
IECEx is the International Electrotechnical Commission's explosion-proof electrical products certification system, it is voluntary and applicable to member countries of the IECEx scheme.
Most major economic powers internationally are members of the IECEx system, and China is one too.
In relation to IECEx and ATEX certifications, ZhongNuo Testing has summarized the following distinctions:
(1) Scope of Application, ATEX certification is applicable to the EU region, IECEx certification is applicable to IECEx member countries.
(2) Whether mandatory, ATEX certification is mandatory, while IECEx is voluntary.
(3) Execution Standards: ATEX certification standards are IEC 60079 series, IECEx certification standards are IEC 60079 series
(4) Explosion-proof Markings, the ATEX explosion-proof mark is more complex than the IECEx certification mark. You can see this clearly by looking at the examples we have provided.
(5) Conversion issues: Currently, ATEX certification cannot be converted to other certificates outside the EU. IECEx member countries, however, recognize IECEx certificates directly or indirectly. For instance, Australia and New Zealand directly recognize IECEx certificates, while other IECEx member countries (such as China) can convert their IECEx certificates into local explosion-proof certificates.
For more information on ATEX certification and IECEx certification, feel free to send us a private message anytime!
explosion-proof certification application consulting service - Shenzhen Zhongnuo Testing Technology Co., Ltd.