Our customer has a semi-automated mixing tank and uses a level sensor to detect the tank level. The tank is filled with a primary solution to a reconfigurable percentage of the full tank, controlled by a setpoint. A secondary solution is then added by hand. Texmate installed a Tiger 320 Series DI-60AT programmable meter controller (PMC). The controller is calibrated to display the percentage in hundredths of a percent (000.00%). When the pump fills the primary solution to the selected percentage, the setpoint relay stops the pump and the controller scrolls the
message [color=red][b]"PUMP IS NOW OFF".[/color][/b] The operator then adds the secondary solution to the tank, and when the level sensor senses the tank is 90.00% full, the meter display scrolls the message [color=red][b]" TANK IS ABOUT TO OVERFLOW--------TIME TO PANIC".[/color][/b] The following macro was written and compiled to control the operation of the primary solution pump and the display messages by the setpoint.
APPLICATION VARIATIONS [ul] [*]For irregular shaped tanks, the level sensor signal can be linearized using one of the controller's four built-in programmable linearization tables. [/ul]
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