The midget impinger is almost identical in principle and design to the Greenburg-Smith impinger, except for its smaller size. Only a 12" head of water is required. The orifice at the bottom of the impinger is 1 mm, passing 0.09-0.11 CFM of air at 12" H2O vacuum. Pieces are interchangeable, maintaining nozzle centering and clearance to the bottom inside surface. These impingers were designed for the sampling of small air volumes with a low jet velocity.
Ref: US Public Health Service Publication No. 999-AP-11. ASTM D2912.
A high velocity impinger used for determining the dust concentration in air or other non-condensable gases. Dispersion tube has vertical spherical joints for connection in a series. Connecting adapters are available.
24/40, Graduated
Connection
