Normy

Obsah

ČSN EN IEC 60704-2-19 This part of IEC 60704 applies to stationary freestanding and wall-mounted air cleaners for domestic and similar use, supplied from mains, d.c. voltage not exceeding 48 V or batteries. This document includes combination products, where air cleaning is combined with for example humidification, but can be used only for the air cleaning function. Fresh-air air cleaners and air cleaners that change their physical location autonomously without user intervention, are excluded from this document. By similar use is understood the use in hotels, hospitals, shops, offices, etc. For determining and verifying noise emission values declared in product specifications, see IEC 60704-3.

Obsah

ČSN EN IEC 60704-2-20 This document specifies the determination of airborne acoustical noise of mains operated and cordless wet hard floor cleaning appliances for household or similar use. In the case of appliances with combined functionality, this document only addresses the wet cleaning functionality. This document does not apply to wet hard floor cleaning appliances for industrial or professional purposes and robotic wet hard floor cleaning appliances. This document describes the determination of the noise emission of wet hard floor cleaners under normal operating conditions on hard floor in accordance with 4.6 of IEC/ASTM 62885-6:2023.

Obsah

ČSN EN IEC 63479-3 This part of IEC 63479 describes the infotainment services for public vehicles (PVIS) framework, including the functional reference models and the information flows for functional operations.

Obsah

ČSN EN ISO 14577-5 This document specifies the method of linear elastic dynamic instrumented indentation test for determination of indentation hardness and indentation modulus of materials showing elastic-plastic behaviour when oscillatory force or displacement is applied to the indenter while the load or displacement is held constant at a prescribed target value or while the indenter is continuously loaded to a prescribed target load or target depth.

Obsah

ČSN EN ISO 11596 This document specifies a method of sampling precious metals and precious metal alloys for the determination of their precious metal content and for the assessment of their homogeneity. The document is applicable to raw materials, semi-finished products and finished products and is intended to be used only for the sampling of entirely metallic materials. NOTE 1 - Standards for determination of precious metals contents for different metals are listed in the Bibliography. NOTE 2 - For assaying techniques different from the listed ones other sampling procedures can be required. NOTE 3 - For the purpose of production control or lot inspections the International Standards for the sampling indicated in the Bibliography or corresponding guidelines can be applied in addition.

Obsah

ČSN EN ISO 21296 This document specifies a method using automated Randall extraction for the determination of the hexane extract (or light petroleum extract), called the "oil content", of oilseeds used as industrial raw materials. The procedure for sunflower seed is different from those for others seeds as it includes an additional moisture content determination after the seed has been ground to prepare the test sample. If required, the pure seeds and the impurities can be analysed separately. In the case of groundnuts, the pure seeds, the total fines, the non-oleaginous impurities and the oleaginous impurities can be analysed separately.

Obsah

ČSN EN ISO 3994 This document specifies requirements for three types of helical-thermoplastic-reinforced thermoplastics hoses for suction and discharge of water, weak aqueous chemical solutions and abrasive solids and slurries, for use in the ambient temperature range from -10 °C to 55 °C. This document does not specify requirements for use with flammable or combustible materials, nor with aromatic solvents.

Obsah

ČSN EN 16715 This document specifies a test method for the quantitative determination of ignition and combustion delays of middle distillate fuels intended for use in compression ignition engines. The method utilizes a constant volume combustion chamber with direct fuel injection into heated, compressed synthetic air. A dynamic pressure wave is produced from the combustion of the product under test. An equation is given to calculate the derived cetane number (DCN) from the ignition and combustion delays determined from the dynamic pressure curve. This document is applicable to middle distillate fuels, fatty acid methyl esters (FAME) and blends of diesel fuels and FAME. The method is also applicable to middle distillate fuels of non-petroleum origin, oil-sands based fuels, blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives and low-sulphur diesel fuel oils. However, users applying this document especially to unconventional distillate fuels are warned that the relationship between derived cetane number and combustion behaviour in real engines is not yet fully understood. This document covers the ignition delay range from 2,6 ms to 3,9 ms and combustion delay from 3,78 ms to 6,56 ms (62,78 DCN to 39,44 DCN).