Mechanical tachometer
Commissioning Air Systems (BG 49/2015), written by Chris Parsloe and published by BSRIA in March 2015, explains how to commission ducted air distribution systems in buildings. It was originally published in 2013 and was then updated in 2015.
It states: ‘Mechanical tachometers can be used to measure rotational speeds where the shaft of the fan or motor is accessible. Provision should be made for the insertion of the tachometer spindle through an access aperture in the guard, as measurements must never be made on an unguarded drive. There are two basic types of mechanical tachometer; one gives a direct reading of speed (rev/min) and the other reads the number of revolutions.’
See also:
--BSRIA
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