Heart of your automatic control system...
the BAILEY COMPUTING RELAY Performs these
COMPUTER FUNCTIONS • MULTIPLIES · DIVIDES • REVERSES · SUBTRACTS • AVERAGES · TOTALIZES pneumatic inputs
Gives these
CONTROL ACTIONS • • • •
PROPORTIONAL PROPORTIONAL plus RESET PROPORTIONAL plus RATE PROPORTIONAL plus RATE plus RESET • FLOATING (reset only)
INPUT
Here's quick, accurate, off-the-shelf help that can simplify auto · matic control-system design . . . provide almost any needed control and computing functions from multiple pneumatic input signals, flexibly and efficiently. The Bailey Type AR80 Computing Relay is designed to receive pneumatic signals from transmitters, controllers and/or relays, and to produce an output signal which is determined by the computing and/or control functions provided in its system. I t can be used singly to perform the functions indicated, or with additional units, for more complex functions. It can also be supplied with provision for remote adjustment of proportional band. This is accomplished either with linkage drive between receiver bellows and proportional band adjustment to give linear action, or with cam drive to permit nonlinear as well as linear computations. Nozzle-vane mechanism is sensitive but sturdy—response is fast but low in air consumption. Signal ranges are standard 3-15 and 3-27 psig. Write for full specifications.
OUTPUT SPRING
INPUT
SPRING
tfm
mm
and petroleum
division
BAILEY METER COMPANY 1 0 2 3 I V A N H O E R O A D · C L E V E L A N D 10, OHIO In C a n a d a —Bailey Meter C o m p a n y
Limited, Montreal
Circle No. 23 on Readers' Service Card 50 A
INDUSTRIAL AND ENGINEERING CHEMISTRY
INPUT SIGNAL
Multiple loading bellows gives wide flexibility By adjusting spring tensions a n d loading appropriate bellows, Bailey Computing Relay provides variety of functions, including: compensating flow from pressure or temperature; multiplying or dividing one signal by another; variable ratio adjustment for a different controller; adjustment of proportional band from remote manual or automatic source; introduction of nonlinear correction factor from a process stream analyzer; compensation of level measurement from specific gravity or temperature.
CP-163-1
Chemical
INPUT
