Intrinsically safe test instrument concept and related issues
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1. What is the intrinsic safety type The intrinsic safety type is intrinsically safe, the symbol is , Refers to a protection method used in a potentially explosive environment. Certified "intrinsically safe" test instruments are not designed to release enough energy to ignite easily-ene materials (such as gas or dust particles) thermally or electrically.
Second, the intrinsically safe main certification standards and institutions 2.1 ATEX standards ATEX is a standard related to equipment and protective systems used in potentially explosive atmospheres. The goal of this standard, called ATEX (94/9 / EC), is to "help ensure the free flow of products within the EU" by minimizing the number of safety protection provisions applied (at least those that originate from divergent interpretations). ATEX has appeared as a voluntary standard since March 1, 1996. Now, it has become a mandatory standard for electrical and electronic equipment sold in the European Union and used in explosive atmospheres.
2.2 NEC-500 standard NFPA (American Fire Protection Association) 70 and National Electrical Code (NEC) are the basis of all electrical codes in the United States. NEC-500 and 505 are related to hazardous area classification and related product identification.
NEC-500 logo
Protection
Factory Mutual certification mark
NI
Non-flammable equipment, internal energy is limited, and its use will not cause combustion in the specified environment
Class I
Can be used for gases, vapors and liquids (instead of dust, fibers or metal shavings)
Div 1
Certified for use in Zone 1 (continuous or intermittent presence of flammable materials)
Dov 2
Certified for use in Zone 2 (usually there is no explosive atmosphere, only a short time)
Groups AD
Can be used in explosive gases defined in Groups AD, including acetylene, ethylene and propane
Groups AD
Can be used in explosive gases defined in Groups BD, including acetylene, ethylene and propane
T4
This temperature category provides users with the maximum temperature of surfaces that may come into contact with explosive environments under fault conditions.
The specified temperature of T4 is 135.
Whoever bears the label meets the Canadian and American CSA logos of the certificate master number (718Ex, 725Ex for LR 110460, 700PEx for 221839).
Meet the above standards and regulations, the two main institutions for product certification: Factory Mutal and Canadian Standards Association (CSA)
3. Industries and equipment that the intrinsically safe products are mainly aimed at All environments where explosive gases or steam exist in petrochemical industry, petroleum platforms and refineries, pharmaceuticals, pipelines with combustible gas, coal mines, etc. The equipment is mainly those that can produce one or more of the following potential explosion sources that have been defined: sparks, arcs, flames, hot surfaces, static electricity, electromagnetic radiation, chemical reactions, mechanical collisions, mechanical friction, compression ignition, ionization Radiation etc.
4. Intrinsically safe electronic test instruments mainly operated by Beijing Ocean Industrial Technology Co., Ltd. Intrinsically safe electronic test products are generally red, and marine instruments mainly include the following intrinsically safe products:
F87VEX intrinsically safe type 3 3 / 4-bit handheld multimeter F707EX intrinsically safe circuit calibrator F718EX intrinsically safe pressure calibrator F725EX intrinsically safe multi-function process calibrator F700PEX intrinsically safe pressure module (including two differential pressure, four gauge pressure) Species, absolute pressure and high pressure)
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