In the field of industrial flow control，the procurement of the DX-TUF-2000S explosion-proof sensor should focus on safety certification。As the two core standards in China and Europe，3C certification and ATEX certification have different requirements for equipment application scenarios and explosion-proof ratings。This article will provide you with a detailed analysis of the technical differences between the two，helping technical evaluation personnel select compliant explosion-proof solutions for ultrasonic flow sensors such as ZJ-100 and TUF-2000S。

I、Definitions and Core Differences Between 3C Certification and ATEX Certification

3C certification（China Compulsory Certification）is a basic requirement for market access in China，covering fundamental indicators such as safety and electromagnetic compatibility of electronic and electrical equipment。ATEX certification（EU Directive 94/9/EC）is a specialized certification for equipment used in potentially explosive atmospheres，requiring equipment to feature intrinsically safe design in hazardous environments such as flammable gases and dust。Taking the DX-TUF-2000S as an example，if it needs to be used in petrochemical projects in China，it must meet both the general safety requirements of 3C and the explosion-proof rating certification of ATEX（such as II 2G Ex db IIC T6）。

II、Comparison of Explosion-Proof Technical Parameters and Analysis of Application Scenarios

When evaluating ultrasonic flow sensor series such as TUF-2000H and TUF-2000P，it is necessary to clarify：3C certification usually only requires the enclosure protection rating of the equipment（such as IP65），while ATEX certification strictly specifies the spark energy limits of the equipment’s internal circuits。For example，the ATEX-certified DX-TUF-2000S must adopt a “flameproof” (Ex d) or “intrinsically safe” (Ex ia) design to ensure that it does not ignite mixtures in a hydrogen（IIC gas）environment。Technical evaluation personnel should make selections based on the actual needs of the project，for example，the ATEX-certified AKT-2000 model should be prioritized in the chemical industry。

III、Procurement and Model Selection Guide：How to Match Project Requirements？

For domestic oil and gas projects，it is recommended to choose the KRC-1518 model with both 3C and ATEX dual certification，whose flameproof chamber design can withstand 20MPa pressure；for food-grade CO2 flow monitoring exported to the EU，the intrinsically safe certification（Ex ia IIC T4）of the AFV series is more cost-effective。The DX-TUF-2000S provided by Xi’an Shenghongchuang Instrument Co., Ltd. adopts a dual-chip redundant design and has passed dual-standard audits by CNEX（China National Quality Supervision and Test Centre for Explosion Protected Electrical Products）and an EU notified body，making it especially suitable for global deployment by multinational enterprises。

IV、Common Misconceptions and FAQ

Q：Can 3C certification replace ATEX certification？
A：No。3C certification is a market access threshold，while ATEX certification is intended for specific hazardous environments。For example，TUF-2000P only requires 3C certification in ordinary workshops，but ATEX certification must be added when it is used in ethanol storage tank areas。

Q：Do explosion-proof sensors require periodic re-inspection？
A：ATEX certification requires a review of the explosion-proof structure every 5 years，while 3C certification usually only requires change filing when standards are updated。Models such as UHCSBL-2000 provided by Shenghongchuang all come with lifetime technical file support。

V、Why Choose Shenghongchuang’s Explosion-Proof Solutions？

As a national high-tech enterprise in Xixian New Area，we have 10 years of experience in the R&D of explosion-proof sensors，and all products（including DX-TUF-2000S，AKT-2000，etc.）have passed ISO 80079-34 explosion-proof quality management system certification。For wall-mounted ultrasonic flow sensors such as ZJ-100，we provide full-process services from explosion-proof model selection and certification agency services to on-site installation，ensuring that your project complies with both China GB standards and EU ATEX Directive requirements。

Contact us now：Visit the official Shenghongchuang website to obtain the TUF-2000S explosion-proof certification white paper，or call our technical team to customize a multi-standard certification solution compliant with IECEx/ATEX/3C for you。