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.
intrinsic safety certification, also known as intrinsic type explosion-proof certification. Below is a detailed introduction to intrinsic safety certification:
The basic definition of intrinsic safety:
Intrinsically safe refers to the design of electrical equipment where the circuit energy is limited so that under normal operation or specified fault conditions, the electrical sparks or thermal effects produced cannot ignite the surrounding flammable or explosive environment. This type of explosion-proofing primarily focuses on limiting the energy within the circuit, reducing the potential spark energy to below the energy required to ignite the specified gas mixture, and keeping the surface temperature of the wires and components below the ignition temperature of the gas mixture, thereby achieving intrinsic safety.
Application Range of Intrinsically Safe:
The Intrinsically Safe certification is widely applied to low-power, low-energy instruments, handheld terminal products, and more. Due to their relatively low energy output, these devices are easily controlled within safe limits through technical means, thereby meeting Intrinsically Safe requirements. Products such as temperature vibration sensors, remote transmitters, monitoring devices, Bluetooth beacons, and walkie-talkies are all eligible for Intrinsically Safe certification.
Safety Certification Standard:
Domestic intrinsically safe certifications primarily follow standards such as GB/T3836.1 and GB/T3836.4. The international IECEx certification standards are IEC60079-0 and IEC60079-11. These standards provide detailed specifications for technical requirements, testing methods, and inspection rules of intrinsically safe electrical equipment, ensuring the device's intrinsic safety performance.
Required Documents for obtaining the ATEX Certification:
Including product manuals, corporate standards, electrical schematics, block diagrams, PCB layouts, assembly drawings, battery specifications, potting process documents, wireless transmission power reports, and material reports for the shell.
The significance of ATEX certification:
Equipment certified for intrinsic safety significantly reduces the risk of accidents in flammable and explosive hazardous environments, safeguarding personnel and property from damage. Moreover, obtaining intrinsic safety certification is a crucial entry requirement for a company's products to enter relevant markets, enhancing their market competitiveness.

ATEX explosion-proof certification is mainly applicable to equipment and protection systems that may generate flammable and explosive environments. These products cover a wide range, including but not limited to the following categories:
(1) Electrical Equipment: Including motors, switches, lighting equipment, etc. These devices must meet specific explosion-proof requirements when used in flammable or explosive environments.
(2) Machinery and Equipment: Machinery and equipment operating in flammable and explosive environments, such as mixers and pumps, also require ATEX certification.
(3) Explosion Protection Systems: Protective systems designed to prevent explosions or limit the impact of explosions, such as explosion-proof walls and suppression devices.
(4) Ex components: Explosion-proof Ex components intended for use in flammable and explosive environments.
However, the 2014/34/EU Directive also explicitly states that the following equipment is not within the scope of the ATEX Directive:
Medical equipment for environmental use
(2) Equipment and protective systems where the explosion hazard is solely caused by the presence of flammable, explosive substances, or unstable chemicals.
(3) Equipment used in residential and non-commercial settings, where potential flammable and explosive substances may occasionally be present due to gas leaks.
(4) Personal Protective Equipment (PPE)
(5) Marine Equipment
(6) Means of Transportation
(7) Other equipment not covered by the specified regulations
For inquiries regarding the scope of ATEX explosion-proof certification, please contact Shenzhen ZhongNuo Testing Technology Co., Ltd. at any time.

The cost of obtaining explosion-proof certification at Shenzhen Zhongnuo Testing Technology Co., Ltd. is related to the following aspects:
1. Should we go for a防爆 certificate or防爆3C certification? For the防爆3C certification, a factory audit is required, which entails additional costs for the audit fee, the travel expenses of the auditor, the applying fee for the 3C certificate, and the certificate fee.
2. Related to explosion-proof markings. Different explosion-proof markings correspond to different explosion-proof items, and naturally, the costs vary accordingly.
3. Domestic explosion-proof certification or international explosion-proof certification? The same explosion-proof mark, ATEX/IECEx certification is much more expensive than the domestic explosion-proof qualification certificate, and it also requires a factory audit. North American explosion-proof certification is even more expensive, over $100,000+
4. Do you need to retest? Some customers' products haven't been designed for explosion-proof at all, and they still need to be rectified, which adds to the cost. If the product includes batteries, battery testing is also an additional expense, especially for those that keep failing the tests.
5. Needed or not. Labs are often booked up, and there are often long wait times. If needed, there will be a fee involved.

Limitation requirements for surface resistivity of non-metallic housing of explosion-proof equipment
In hazardous areas with explosive dust or gases/vapors, such as coal powder and flour, static electricity can cause fires or explosions, posing significant danger. Therefore, it is advisable to minimize the use of insulating materials in explosive hazard areas. When selecting electrical insulating materials, consider maintaining low insulation resistance to prevent discharge when non-metallic components come into contact with charged components. For non-metallic insulating materials, the antistatic capability of the equipment can be assessed by measuring the surface resistance of the equipment's housing.
Surface Resistance, measured in ohms (Ω), refers to the resistance between two electrical contacts on the measuring surface.
In accordance with the requirements of the IEC 60079 series standards:
1. In II Division explosive gas environments, when the surface area of the non-metallic housing of electrical equipment exceeds a certain limit value (as shown in Table 1), a surface resistance test of the non-metallic material is required to verify that: by selecting the material, the surface resistance meets at least one of the following requirements when measured according to IEC 60079-0 26.13:
At ≤1 GΩ, (505)% relative humidity;
At ≤100 GΩ, (305)% relative humidity.
2. In environments with Class III explosive dust, if the surface area of the non-metallic casing of electrical equipment does not exceed 500 mm², the risk of static electricity can be disregarded; if it exceeds this limit, surface resistance testing is required for verification. The assessment requirements are the same as those for the surface resistance testing limits for Class II gas environments. For fixed-installed equipment that cannot meet the surface resistance limits, an "X" can be added after the #explosion-proof# symbol, a corresponding warning sign should be placed on the equipment, and users should be informed in the user manual.
explosion-proof certification application consulting service - Shenzhen ZhongNuo Testing Technology Co., Ltd.