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Swema 125D | Air capture hood

Contact Instrument Solutions

The SwemaFlow 125D measures both supply and exhaust air volumes from 2 to 125 l/s (7 to 450 m3/h), together with temperature and barometric pressure. The instrument measurement principle is based on a net of hot wires, which gives a good and accurate mean value of the air flow in the capture opening. The value on the instruments display is the average over 2 seconds, with an update of two times per second. Barometric pressure and ambient air temperatures are also measured to compensate the instrument to standard conditions.

Features

Pressure drop compensation

The instrument has a built in facility to compensate for the restriction the hood and measurement grid puts on the fan system. The "back pressure method" takes two measurements, one with a restriction ring in-place and one without, to compensate for the restriction. This is the ideal tool for low pressure ventilation systems.

Air flow scaling

Apart from the "back pressure method" it is possible to show the flow multiplied with a Flow Factor. This can be useful when balancing systems and this factor has been determined via an alternative measurement method such as a series of pitot traverses in a supply duct from a fan.

Technical

Range      2 to 125 l/s, 7 to 450 m3h

Temperature      0 to 50 oC

Airflow accuracy      3.5 % indicated value or 0.4 l/s whichever is the greater

Weight       1.975 kg with 300 x 300 mm hood

Support documents

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Download
NHBC ventilation guidance note January 2014.pdf NHBC ventilation guidance note January 2014
Category
Technical document
File type
Adobe Acrobat
Download (644 KB)
Download
SwemFlow 125D user manual.pdf SwemFlow 125D user manual
Category
Technical document
File type
Adobe Acrobat
Download (259 KB)