Measurement of gas flow by means of critical flow Venturi nozzlesBS EN ISO 9300 specifies the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow rate of a gas flowing through a system. It also gives the information necessary for calculating the flow rate and its associated uncertainty. It applies to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local

2 Fixings and materials not supplied by the manufacturer

air-conditioning and ventilation

Contents for BS EN 15221-4 includes:

Management of an LPMS

The tanks or vessels may be factory made or site built

Contents of BS EN 200

This standard will be useful to those who are looking for a better understanding of how to use standards and how they fit with the essential principles

butt welds

EN ISO 17249:2004

less than 220 V line to neutral and/or frequency of 60 Hz

surface-cleaning appliances employing liquids or steam

BS ISO/IEC 19785-1 provides the means for identification of the formats of the biometric data blocks (BDBs) in a BIR