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The measurement of peak expiratory flow was pioneered by Martin Wright, who produced the first meter specifically designed to measure this index of lung function. Since the original design of instrument was introduced in the late 1950s, and the subsequent development of a more portable, lower cost version (the "Mini-Wright" peak flow meter ...
Basil Martin Wright (20 December 1912 – 4 March 2001) was a British bioengineer who invented several notable medical instruments, including the peak flow meter and syringe driver. The "alcolmeter" he developed won a Queen's Award for Industry and is the breathalyser most often used at the road-side in the United Kingdom.
1959 Wright B. M. and McKerrow C. B. introduced the peak flow meter 1969 DuBois A. B. and van de Woestijne K. P. experimented on humans using the whole body plethysmograph 1974 Campbell et al. refined the previous peak flow meter, developing a cheaper and lighter version [ 2 ]
It should theoretically be identical to peak expiratory flow (PEF), which is, however, generally measured by a peak flow meter and given in liters per minute. [ 16 ] Recent research suggests that FEF25-75% or FEF25-50% may be a more sensitive parameter than FEV1 in the detection of obstructive small airway disease.
Chemist Warehouse Group (trading as Chemist Warehouse, My Chemist, My Beauty Spot) [3] is an Australian company operating a chain of retail pharmacies both locally and internationally. The company is one of Australia's largest pharmacy retailers with over 500 stores in Australia, [ 4 ] and employs over 20,000 staff. [ 5 ]
Because they are used for domestic water measurement, piston meters, also known as rotary piston or semi-positive displacement meters, are the most common flow measurement devices in the UK and are used for almost all meter sizes up to and including 40 mm (1 + 1 ⁄ 2 in). The piston meter operates on the principle of a piston rotating within a ...
A velocity-type meter measures the velocity of flow through a meter of known internal capacity. The speed of the flow can then be converted into a volume of flow to determine the usage. There are several types of meters that measure water flow velocity, including jet meters (single-jet and multi-jet), turbine meters, propeller meters and mag ...
An air flow meter is a device similar to an anemometer that measures air flow, i.e. how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time, though Thus air flow meters are simply an application of mass flow meters for the ...
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