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HM 220 Airflow Study Unit
Education / GUNT Hamburg / Fluid Mechanics and Hydrology / Steady Incompressible Flow /


The system offers comprehensive investigations on air flow. A fan draws air through a section of pipe. The air flow rate can be measured with various measuring inserts such as a nozzle/orifice, Pitot tube or iris diaphragm. The measuring inserts are connected to a multiple tube manometer using hoses; the pressure differences can then be read on the manometer. Measuring glands are also fitted to the pipe section at evenly spaced intervals; these can be used for determining pipe friction, pressure losses or velocity profiles. The tube manometer can be tilted to increase precision and can be fixed in various positions. Open jet experiments can be performed at the fan outlet.

Learning Objectives / Experiments
· Measurement of air flow rate with a nozzle/orifice
· Measurement of air flow rate with a Pitot tube
· Measurement of air flow rate with an iris diaphragm
· Measurement of pressure loss in the straight section of pipe
· Measurements of pressure loss in pipe bends
· Determination of pipe friction
· Velocity profile in a pipe through which air is flowing
· Velocity profile in an open jet
· Preparation of system characteristic curves

[1] Study unit for comprehensive investigations on air flow
[2] Radial fan with speed adjustment by frequency converter

[3] Adjustable Pitot tube for open jet experiments on the fan outlet
[4] Pipe section and diverse measuring inserts along with a 16-tube manometer for pressure measurements
[5] Pipe section with evenly spaced measuring glands
[6] Various fittings included

Technical Data
Radial fan 550W
Max. volumetric flow rate 1320m³/h
Max. differential pressure 730Pa
Tube manometer, 16 tubes
Measuring range 600mmWG
Area distribution 10:5:2:1
Iris diaphragm, d adjustable from 20..70mm
Orifice/nozzle d=50mm
Aperture d=30mm
Dimensions and Weight
l x w x h: 3270 x 790 x 1338 mm
Weight : approx. 151 kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery
1 study unit, 
1 instruction manual
Order Details
070.22000 HM 220 Airflow Study Unit