Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1992-05-22
1993-10-19
Noland, Tom
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
34087004, 34087016, 36457104, 36457105, G01D 302
Patent
active
052535118
ABSTRACT:
A process variable transmitter which has a manual adjustment for span and zero or the like. The adjustment has a finer adjustment range where the output changes responsive to changes in the position of the adjustment. The adjustment has a coarse range where the transmitter output changes automatically as a function of time to provide coarser adjustment. An operator can move the back and forth between the adjustment ranges until a desired output value is observed. When adjustment is complete, the operator can manually select the desired transmitter output value and then a selection circuit stores the setting in non-volatile memory. After a setting is stored, the transmitter output is not sensitive to movement of the manual adjustment, but is instead controlled by the stored setting.
REFERENCES:
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patent: 3513371 (1970-05-01), Hoppe
patent: 3544970 (1970-12-01), Weinbaum
patent: 4221004 (1980-09-01), Combs et al.
patent: 4353019 (1982-10-01), Sweeney, Jr.
patent: 4549173 (1985-10-01), Nakamura
patent: 4549180 (1985-10-01), Masuda
patent: 4651147 (1987-03-01), Wennersten et al.
patent: 4748852 (1988-06-01), Frick
patent: 4782285 (1988-11-01), Bristol et al.
patent: 4783659 (1988-11-01), Frick
patent: 4922856 (1990-05-01), Sweeney, Jr.
TEK Operators Manual for Tektronix 2430A Digital Oscilloscope pp. 5-12, 5-13, FIG. 9-6, and FIG. 9-7 published by Dec. 1990.
Carlson Karen B.
Frick Roger L.
Jaramillo Rafael
Paschke Randy K.
Throne Christopher M.
Noland Tom
Rosemount Inc.
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