Air flow hood

Air flow hood

SwemaFlow 126

P/N: 769580 [View large]
• Supply and exhaust air flow
• 1,5...125 l/s, 3...263 cfm
• High accuracy and stability
• Pressure drop compensation
• Memory
• Temperature
• Barometer
• Density compensation
• Real or Standard flow
• 150 grams lighter
• Larger hoods for supply air
• EN 16211, EN 12599 compliant

SwemaFlow 126
SwemaFlow 126 is ideal for testing, adjusting and balancing (TAB) of both exhaust and supply air flows. The proven Swema principle, a net of hot wires, gives accurate measuring values over the whole measurement range. The hot wires together with the back pressure method and the larger hood makes it suitable for supply air, including air flows from angled outlets. The measured values can be stored and transferred to PC.

SwemaFlow 126 Twin
SwemaFlow 126 Twin (part no. 769980) has an in-built Bluetooth-modem. Balancing of ventilation according the proportional method is made possible by communicating with a SwemaMan 8 with modem placed on the reference valve.

SwemaTwin, Product Sheet, Manual, SwemaFlow 126 Twin supplement manual

Measuring range
Air flow: 1.5...125 l/s, 5.4...450 m³/h, 3.2...263 cfm
Temperature: 0...50 °C, 32...122 °F
Barometer: 600...1200 hPa, 18...35 inHg

Measurement uncertainty
Air flow: ±3.0% read value (at 20...25 °C)
min ±0.5 l/s, ±1.8 m3/h, ±1 cfm
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

(Uncertainty according to GUM (JCGM 100ː2008) using a coverage factor of 2, which for a normal distribution corresponds to a probability of 95%. It is important to correct the measurement values with the corrections stated in the calibration certificate to obtain the above uncertainties.
Non condensing, non moist air, <80%RH, non aggressive gases.)

Memory: 9999 measurements
Measurement opening: 300 x 300 mm (inner)
Height: 575 mm (incl. hood 300x300 mm)
Height: 145 mm (measuring unit only)
Weight: 1.8 kg ( incl. hood 300x300x470 mm and ring)
Battery life: 12 hours at 0 l/s, 2 hours at 125 l/s, 260 cfm
Battery charging time: 80% in 1 hour, 100% in 2 hours, SwemaFlow can be used during charging.

Measuring principle and recommendations
Mass flow, net of hot wires. 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 back pressure method has proven to have good accuracy and complies with EN 16211 method ST 33 and ET 23. Apart from the back pressure method it is possible to get a direct reading of the air flow according to EN 16211 method ST 31 and ET 21. The direct reading can also be scaled. Scaling with a flow factor is useful when balancing the flow. Complement the 650x650 hood with a cross to disrupt the swirl created by swirl diffusers. The included 300x300x470 foldable hood is intended for exhaust but can be used for supply air after checking that the result is the same as with a larger hood.

Density compensation
Temperature and barometric pressure is measured. Select Real or Standard flow with PC-setting.

Functional design
Two handles, the measured values are easily stored by means of a button on the measuring unit.

l/s, m³/h, °C and hPa or cfm, °F and inHg, depending on PC-settings.
Segment with backlight, hold

Delivery contents
Measuring unit, restriction ring, 300x300x470 mm exhaust hood, charger (230 V), USB cable, calibration protocol, manual, case

Swema AB, SE556052555101