Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1975-07-22
1976-11-30
Ruehl, Charles A.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
138 46, G01F 2500
Patent
active
039941531
ABSTRACT:
The calibrator device is used for calibrating the flow indicator (rotometer) of an air pollution sampling instrument known as a high volume air sampler which determines the concentration of the total suspended particulate in the ambient atmosphere. The calibrator is of cylindrical shape having an annular passage and centrally disposed knob at one end and a pair of aperture plates at the other end, one of which is fixed in position and the other one of which is rotatable by means of the knob. Each calibrator defines a flow characteristic represented by a graph of flow versus orifice pressure, and by setting the flow resistance at different sequential values by rotation of the knob a plot is established of true air flow in cubic feet per minute (cfm) versus observed flow meter reading.
REFERENCES:
patent: 1023739 (1912-04-01), Joyce
patent: 2701467 (1955-02-01), Strong et al.
patent: 2909920 (1959-10-01), Emmons
patent: 3295359 (1967-01-01), Peck
Gussman Gertrude
Gussman Robert A.
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