PROCESS VARIATE TRANSMITTER

Japanese Patent JPS597209

A

A process variable transmitter 2 senses a process variable, such as pressure 3, and produces an output current in the range 4 to 20 mA. The sensor 4 produces this range for an inbuilt pressure range 0 to URL (upper range limit), and is followed by adjustment means which are settable to produce the output current range for an input pressure range from LRV (lower range value) to URV (upper range value), which is obviously within the range 0 to URL. To avoid interaction between the settings of LRV and URV, the signal is converted into digital form at 6, processed by a microcomputer 8, 14-19, and converted back to analog form at 10. The microcomputer stores the processing equation $where\; LRV\; is\; set\; by\; generating\; an\; LRV\; set\; signal\; at\; 20\; simultaneously\; with\; applying\; the\; LRV\; pressure,\; and\; then\; URV\; is\; set\; by\; generating\; a\; URV\; control\; signal\; at\; 22\; simultaneously\; with\; applying\; the\; URV\; pressure.$

JP4881042	Communications system
JPS53138362	FOLLOW-UP COMPARISON TYPE SIGNAL PROCESSOR

SUTEFUAN JIEI BEIYAA
AASAA EMU ORUSON

JP10911383A

January 14, 1984

June 17, 1983

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HONEYWELL INC

G01D3/024; G01D3/02; G01D18/00; G01L9/00; G01L27/00; G01R15/08; G08C13/00; G08C19/02; (IPC1-7): G01D3/02; G08C25/00

JPS5282354A	1977-07-09
JPS5744416B2	1982-09-21

Masaki Yamakawa (3 outside)

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