Immagini

DESCRIPTION

Exhibit 667 is a flowmeter (Rotamesser) for measuring from 0,1 to 30 liters per hour, apparently invented by Karl Kueppers in 1908 and patented by Deutsche Rotawerke of Aachen.

A flowmeter consists of smooth glass vertical tube containing a float that is pushed up by the flow and pulled down by gravity. The float must have a density greater than that of the liquid to avoid floating even when there is no flow and a diameter less than that of the tube to avoid jamming.

Our flowmeter has a glass tube 50 cm long and with an external diameter of 0,8 cm supported by a brass base with three leveling screws and a plumb line for certifying verticality. To protect the tube there are three iron rods inserted into the structure. The tube is connected to a rubber tube on the top and to a brass valve on the bottom. The float has the form of a small screw pointing downward and a larger diameter on the top. At the top of the tube there are two springs to dampen the float movement under strong flows. The tube has a non-linear graduation from 0 to 30 liters per hour ("liter butt pro stunde").

BIBLIOGRAPHY

• [1] URL [ http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=V_AFLowRotometers.htm&ID=813 ]

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