The probe SWA 31 with Swema 3000 measures 0,1...30m/s and is temperature compensated from -10 to +45°C.
On the 66 cm long telescopic shaft there is a scale for easy placement in ventilation ducts. The measurement is displayed directly or with a number of points as average, max and min.
The duct dimension as: diameter, height and width or area, can easily be inserted into Swema 3000 to make the instrument calculate and display the flow in l/s , m3/h or CFM. The most common standard dimensions are selected directly.
To get a good flow value in the duct the instrument makes an average of point measurements over the selected area. According to research, due to friction at the wall, there is a reduction factor k2, that reduces the calculated value.
For grilles, you enter the height x width using auto-sampling and a smooth sweeping technique across the grilles, Swema 3000 calculates the rate of air flow in l/s, m3/h or CFM. Set the time constant down to 0.025 sec to get 4 measurements /sec. Average, standard deviation, max and min is automatically calculated.
Fume cupboard measurements
SWA 31 measurements complies with EN 14175:3-4.
0,1...10m/s (30m/s extra calibration)
at 23°C ± 3°C:
±0,03m/s at 0,1...0,4 m/s
±0,04m/s at 0,4...1,33 m/s
±3% read value at 1,33...30 m/s
Full operating range +10...+45°C:
±0,05m/s at 0,1...1,10 m/s
±4,5% read value at 1,10...30m/s
Full operating temperature range -20...+80°C:
±0,3°C at 23°C, ±1,0°C at -20...+80°C
95% coverage probability in non condensing, non moist air, <80%RH, non aggressive gases
Selectable resolution: 1, 0.1, 0.01m/s, 0.001 or 0.01cm/s
Air Flow Range: Function of air density (Barometric pressure), duct size, k2-factor and air velocity
Selectable duct sice: 10...2550 x10....2550 mm
in increments of 1mm or
diameter 10...288.0cm in increments of 0.1cm or
max area: 6.5m2 in increments of 0,0001m2
Selectable resolution 1, 0,1 or 0.01°C
Ø 8...10 mm probe: SWA 31: 66cm, SWA 31E: 116cm
The accuracy for each probe is the accuracy for the probe
together with the Swema 3000. That is, included in the
accuracy for each probe is the accuracy for Swema 3000,
interchangeability, calibration, temperature dependence,
hysteresis and repeatability.