is a fast and accurate air flow hood instrument. It measures exhaust air flow in ventilation systems from 1 to 65 l/s (4-234 m³/h, 2...138 CFM).
Swema measuring principle with a net of hot wires is unique. The net allows low flow and also a wide opening. The net of hot wires covers the whole opening which gives an accurate mean value and minimises the throttle effect. The temperature and barometric pressure is measured to compensate the flow for air density.
Low weight and telescopic handle
The low weight and the telescopic handle with angular adjustment ensures good balance and tightness. With the extended handle a ladder is in most cases not needed.
Large digital display
The large digital display with backlight shows instantly the flow with one decimal. When needed the digits in the display can be turned upside down for easier readings. The units l/s, m³/h, °C or CFM, °F are easily selected. SwemaFlow 236 can freeze the measured value.
SwemaFlow 236 is charged with the included charger or with a standard USB charger (max 1,6amp). To measure supply air flow a foldable supply air capture is used.
SwemaFlow 236 manual.pdf
Air flow: 1...65 l/s, 4...234 m³/h,
Temperature: 0...+50 °C, 32...122 °F
Barometer: 600...1200 hPa, 18...35 inHg
Air flow at 20...25°C
±3,5% read value
min ±1 l/s or 3,6 m³/h or 2,1 CFM
Temperature: ±1 °C or ±2 °F
Barometer: ±3,5 hPa, ±0,1 inHg
At 95% coverage probability in non condensing, non moist air, <80%RH, non aggressive gases.
Measurements corrections based in the calibration protocol are not needed to obtain the above stated uncertainty.
Shaft adjustable length: 45...80 cm
Measurement opening (facing the valve) 19x20cm
Height 33 cm
Weight 1,5 kg
Battery: Chargeable Li-Ion for 2...9 hours continuous measurement
Charging time 2 hours
Net of hot wires
SwemaFlow 235, charging adapter (230V Europlug - EN 50075), calibration protocol, manual, aluminium frame case
330x330mm Foldable exhaust and supply hood
30x300mm exhaust hood