Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1980-08-05
1982-07-20
Woodiel, Donald O.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
731174, 73178R, 73756, G01L 2700
Patent
active
043399436
ABSTRACT:
A pressure transducer cross-check system (10) in which a pair of low precision pressure transducers (12, 14) which detect parameters related to each other in content are alternately periodically calibrated during the operation of the system by cross-checking by a solenoid actuated valve (18) which alternately connects one of the pair of low precision pressure transducers (12, 14) to its associated pressure input (20, 22) while connecting a common high precision pressure transducer (16) to the other of the related pressure parameter inputs (20, 22) for selectively alternately providing one of the pair of parameter input signals as a high precision pressure responsive input signal to the system controller on alternate cycles of the low precision pressure transducer pair in accordance with the cycling of the valve (18). The high precision pressure transducer (16) output signal and the alternately selected low precision pressure transducer (12, 14) output signal are compared under identical sampling conditions, such as by conversion of the low precision pressure transducer voltage output into a frequency output via a voltage-to-frequency converter (32) where the high precision pressure transducer (16) output is a signal in which the frequency is proportional to pressure.
REFERENCES:
patent: 3310666 (1967-03-01), Millar et al.
patent: 3585841 (1971-06-01), Brandau
patent: 3835701 (1974-09-01), Murphy
patent: 3837220 (1974-09-01), McDonald
patent: 3852741 (1974-12-01), McDonald
patent: 3886790 (1975-06-01), Plett
patent: 3927307 (1975-12-01), Reschak
patent: 4003249 (1977-01-01), Laskody
patent: 4130872 (1978-12-01), Harioff
Smiths Industries Limited
Woodiel Donald O.
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