Methods for measurement of air pollution - Determination of a black smoke index in ambient airWhat is BS EN 1747 11 Methods for Measurement of air pollution about? BS EN 1747 11 specifies a method for measuring the black smoke index of an ambient air sample. The method is based on the staining effect of particles which is produced when a sample of air is drawn through a filter paper. The method described in BS EN 1747 11 is intended for the measurement of a black smoke index in the range 6 to 375 in the ambient atmosphere. It is based on the

such as appliances intended to be used by laymen in shops and other premises for normal housekeeping purposes

ISO/TS 20758 covers the material

that offers excellent thermal and corrosion resistant properties

typically 50 mm × 20 mm × 5 mm

impurities and insoluble matter

Table 6 – Pull and torque values

BS 5708 provides users guidance on type testing

Four classes of gears are provided which are related to function and precision

the apparatus

there is some overlap

It may also be used for invoicing between private sector enterprises

Fire safety managers