Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal mine safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
What is positive pressure explosion-proof? What technical requirements are there for explosion-proof certification of positive pressure products?
Positive pressure explosion-proof refers to introducing clean air or inert gas into the interior of the equipment.
Ensures internal equipment pressure exceeds the external explosive environment pressure, isolating explosive mixtures from entering the equipment, to achieve explosion-proof performance.
The explosion-proof certification applicable standards are GB/T 3836.1 and GB/T 3836.5.
Primarily, it assesses 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 zones.
ZhongNuo Inspection has been involved in the explosion-proof industry for many years and is well-versed in the requirements of the GB/T 3836 series standards.
We have extensive experience in obtaining certifications for explosion-proof, positive-pressure systems.
We offer a one-stop service for explosion-proof technical guidance and consulting, including initial positive pressure explosion-proof design and rectification, drawing assessment, installation guidance, and certification acquisition.
Our successful cases include positive-pressure ultrasonic vibration plates, positive-pressure omnidirectional antennas, and positive-pressure film thickness gauges, etc.
If you have a need for this, feel free to message us anytime!

Is "intrinsically safe certification" the same as explosion-proof certification? What are the differences between them?
Intrinsically Safe Certification refers to a safety certification for equipment and products used in explosive hazardous areas.
Products must take certain measures to meet the requirements of explosion-proof certification standards; we refer to these as explosion-proof protection types.
Common explosion-proof protection types include intrinsic safety, flameproof, positive pressure, and increased safety, etc.
Clearly, intrinsic safety is just one type of explosion-proof protection.
Different explosion-proof protection types have varying design requirements for products.
Intrinsically safe design limits electrical energy, ensuring that even in the event of a fault,
A type of explosion-proof protection that the energy produced is not sufficient to ignite the surrounding explosive environment.
Therefore, intrinsically safe types have limitations on electrical equipment's current, voltage, capacitance, inductance, etc., and are generally suitable for low-power equipment.
Additionally, specific requirements are in place for the power supply method of intrinsic safety equipment, the material of the housing, and wireless transmission.
As a third-party consulting firm that has long focused on explosion-proof certification.
ZheNuo Testing has dedicated engineers specializing in intrinsic circuit and structural design.
We offer technical consulting services for explosion-proof circuit design, drafting, and modifications. We have extensive experience in designing and obtaining certifications for intrinsically safe ia, ib, and ic explosion-proof classifications.
If you require certifications in this area, feel free to send us a private message!

Division of explosion-proof zones in flammable dust environments -- Shenzhen ZN Testing Technology Co., Ltd.
In explosion-proof certification, hazardous areas are classified into explosive gas environments and combustible dust environments based on the different states of matter present at the location. Based on the duration of presence of the hazardous substances in the location, the hazardous areas under the two different states of matter are divided into three zones.
For environments with combustible dust, it applies to 20, 21, and 22 Zones.
Areas in Zone 20 where flammable dust environments occur continuously or persist for extended periods, typically over 1000 hours per year.
Zone 21 - Areas where combustible dust environments may occur during normal operation, typically 10-1000 hours/year
Zone 22 - Under normal operation, it is impossible to have an environment with flammable dust or a place that occasionally exists for a short period of time; generally less than 10 hours per year.

What are the standards for explosion-proof certification? What are the technical requirements?
An explosion-proof type is a type of explosion-proof design for electrical equipment.
The shell is capable of withstanding explosive mixtures entering the interior through the shell joint surfaces or structural gaps, without damage upon internal explosion.
And ignition of an explosive gas atmosphere formed by one, several gases or vapors.
Explosion-proof casings must possess both anti-explosion and explosion-proof capabilities. Generally, the casings for explosion-proof products tend to be heavy and are suitable for products and equipment that require fixed installation and use.
Combustible gas-tight joint width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for the explosion-proof three elements vary depending on different explosive gas environments used in Class I mining, non-mining Classes IIA, IIB, and IIC.
Refer to the design standards of GB/T3836.1 and GB/T3836.2 for specifics.
ZhongNuo Inspection has long been dedicated to explosion-proof product design, testing, and certification services.
We have a team in the explosion-proof field, well-versed in explosion-proof standard requirements.
We offer explosion-proof housing design, drafting, modification guidance, certification agency services.
If you have a need for this as well, feel free to send us a private message anytime!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.