Air Flow capture - SwemaFlow 126
SwemaFlow 126 measures both exhaust and supply air. For supply air the longer 650x650 and 250x650 hoods are recommended. The range is from 1,5 to 125 l/s, 5,4 to 450m³/h, 2,3 to 260 CFM. Temperature and barometric pressure are also measured. SwemaFlow 126 is based on the well known Swema principle, a net of hot wires, which gives a good and accurate mean value of the air flow in the capture opening.
This principle together with the longer hoods (650x650 or 650x250) makes it also possible to cope with the airflow from angled outlets. Complement the 650x650 hood with a cross to disrupt the swirl created by swirl diffusers. The included 300x300x470 red foldable hood could measure supply air after calibrating the result with a longer hood.
A digital display can toggle inbetween l/s, m³/h , °C, hPa. (A PC-setting sets the units to CFM, °F, inHg)
When turning ON by pressing red and blue button the display light is illuminated.
Pressure drop compensation
Use the "back pressure method" and take two measurements, one with a restriction ring and one without, to compensate for restriction and make measurements with high accuracy, even in low pressure ventilation systems. SwemaFlow 126 calculates the uninfluenced flow rate. The backpressure method has proved to have good accuracy, with a total standard measurement error (67% coverage), including the method, of less than 10%.
Air Flow scaling
Apart from the Backpressure methode it is possible to show the flow multiplied with a Flow Factor. This is good when balancing the flow and Flow Factor is calibrated with the backpressure methode. A Hold function can look the measuring value when it is hard to see.
The flow capture’s measuring unit is equipped with two handles which you hold when pressing the capture onto the outlet.
The measured values are easily stored by means of a button on the measuring unit. The capture incorporates a chargable battery and a fast and efficient charger. Charging takes one or two hours and is sufficient for a normal working day.
Densitety compensation is possible since temperature and barometric pressure is measured. Select Actual or standard flow with PC-setting.
SwemaFlow 126 manual.pdf
SwemaFlow 125D manual.pdf
Air flow: 1,5...125 l/s, 5,4...450 m³/h ,
Temperature: 0...+50 °C, 32...122 °F
Barometer: 600...1200 hPa, 18...35 inHg
Air flow at 20 ... 25 °C
1,5 ...15 l/s: ±0,4 l/s, ±1 CFM
15 ...125 l/s: ±3,0% read value
Temperature: ±0,5 °C, ±1,0 °F
Barometer: ±3,5 hPa, ±0,1 inHg
Back-pressure method uncertainty
±10% read value, minimum 1 l/s, 2,1 CFM
At 95% coverage probability in non condensing, non moist air, <80 % RH, non aggressive gases.
Memory: 9999 measurements
Weight incl. capture 300x300 mm and ring: 1,82 kg
Battery charge time:
80 %: 1 hour, 100 %: 2 hours
Operating time on full charge:
12 hours at 0 l/s, 2 hours at 125 l/s, 260 CFM
Actual or standard flow
Mass flow, net of hot wires
Measuring unit, restriction ring, 300x300 mm exhaust hood, charger (230V), USB cable, calibration protocol, manual, aluminium case