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 inquire about explosion-proof certification
Buyers and selectors of explosion-proof electrical equipment prefer manufacturers or distributors with valid explosion-proof certifications.
So, as a consumer, how do users verify the authenticity and validity of explosion-proof certificates?
Currently, there are over a dozen authorized issuing organizations in China for domestic explosion-proof certification.
There is no unified platform for querying explosion-proof certification issued by various issuing bodies.
Explosion-proof certificates issued by various institutions can only be verified on their respective websites.
Of course, every issuing institution can verify the authenticity of certificates by phone.
If the query certificate is genuine, the main parameters and validity period will be displayed below.
Of course, it would be impossible to find it then.
It's worth noting that due to the manual uploading of certification documents by various issuing authorities, there is a certain lag.
That is to say, the newly acquired certificate may not yet be searchable on their website.
This would require direct consultation with the shipping agency.

What are the markings on explosion-proof electrical equipment?
A complete explosion-proof marking includes:
Ex Mark
Explosion-proof type
Gas/Dust Combination
Temperature Group
Equipment Protection Level
Ex db ib IIc T4 Gb
Ex tb ⅢC T130°C Db
For more information, please contact Shenzhen ZN Testing Technology Co., Ltd.!

What is positive pressure explosion-proof? What technical requirements are there for obtaining a positive pressure explosion-proof certification for a product?
Positive pressure explosion-proof refers to introducing clean air or inert gas into the equipment interior.
The design ensures internal pressure of the equipment exceeds the pressure of the external explosive environment, effectively preventing the entry of explosive mixtures into the equipment, thus achieving explosion-proof capabilities.
The positive pressure explosion-proof certification complies with the standards GB/T 3836.1 and GB/T 3836.5.
Primarily assess the equipment's ventilation time, pressure monitoring system, pressure range, blow-off, and alarm functions to meet explosion-proof performance requirements.
Positive pressure type includes three explosion-proof grades: pxb, pyb, and pzc.
Select the appropriate explosion-proof certification level based on product structure and explosion-proof areas.
ZhongNuo Inspection has been in the explosion-proof industry for many years, familiar with the requirements of the GB/T 3836 series standards.
We also have extensive certification experience in positive pressure explosion-proofing.
Offer a one-stop explosion-proof technical guidance and consulting service, including initial positive pressure explosion-proof design and rectification, drawing evaluation, installation guidance, and certification acquisition.
Our successful cases include positive pressure ultrasonic vibration plates, positive pressure omni-directional antennas, and positive pressure film thickness gauges, etc.
If you have a need for this, feel free to message us anytime!

Which certifications are the explosion-proof ATEX and IECEx certifications from?
ATEX certification is a mandatory certification for explosion-proof products in the EU, serving as a specific explosion protection directive under the CE certification, applicable to the EU and its regions.
IECEx is the International Electrotechnical Commission's explosion-proof electrical product 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 as well.
In relation to IECEx and ATEX certifications, ZhongNuo Inspection summarizes the following distinctions:
(1) Application Range: ATEX certification applies to the EU region, IECEx applies to IECEx member countries.
(2) Is it 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 from the examples we have provided.
(5) Conversion issues: Currently, ATEX certification cannot be converted to other certificates outside the EU. IECEx member countries recognize IECEx certificates directly or indirectly, such as Australia and New Zealand, which directly recognize IECEx certificates. 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 message us anytime!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.