Abstract:
The project is to design, implement and monitor a level control system in our case we will control the water level.To
this end we begin with the design of a first metal structure which will be located at the glass tank 1 m eter in height
at the top, and the reservoir of 40cm in height at the bottom. The centrifugal pump will be on the reservoir, and the
ultrasonic sensor, RF transmitter and 12Vdc source on the glass tank .
In the second structure will place a control panel which will ha ve a MicroLogix 1200 PLC Allen-Bradley, Analog
Expander IF2OF2, Variable Power Flex 4 Allen -Bradley,protect motor,RF module (receiver), control transformer,
source 12 and 5 Vdc, pushbuttons, pilot light, 3 position selector, switches, terminal blocks .
The control level of our educational system we will be controlled using a PID programmed into the PLC so as to
enter the ultrasonic sensor signal (4 to 20mA equivalent of 0 to 80 cm) from the tank glass, this signal will
compared with the setpoint and set by the user. In this way generate an output signal (0 to 10Vdc), to be connected
to drive the analog input since this way they controlled the flow by varying the frequenc y.
Revista Tecnológica ESPOL – RTE, Vol. 22, N.1, (Diciembre, 2009)
All this process we will monitor through a SCADA system, in our case we use intouch, which will control the liquid
level, varying its setpoint
