Instrumentation, Control & pH Process Control Trainer | H-ICS-8189-4pH Get latest price

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By simulating a different process loop, this unit provides instruction in the measuring and transducing of such physical variables as pressure, flow, level and pH.

Students and trainees learn instrumentation and control techniques of standard commercial manufacturers, such as Yokogawa, and Rosemount. Various types of closed-loop control: on/off, proportional, proportional plus integral, and proportional plus integral plus derivative, as well as a variety of final control devices, including electric, pneumatic and electronic are covered.

The system consists of two sections: one with a clear process level tank, reservoir tank, pump and other instrumentation mounted on or inside the mobile bench to provide measurement and control of flow, level and pressure utilizing microprocessor based controls. The pH process loop section contains two reagent pumps, one circulating pump, two reagent tanks, each with a gravity and pump circuit, one mixing tank with three controlled level output flow circuits, one controlled drain circuit, and one storage tank with liquid transfer pump.

The acidic and/or caustic reagents are pumped or gravity fed from their respective tanks into the mixing tank. The pH sensor transmits a 4-20 mA signal to the controller. The controller, in turn, then sends a 4-20 mA control loop signal to vary the speed of the appropriate metering pump required to bring the solution in the missing tank to the setpoint level. It is designed to provide instruction on the measurement and control of pH.

In level loop, water is pumped through the delay loop to the level tank. The water level in the level tank is controlled by changes in the control valve. The 4-20 mA input loop consists of a level transmitter, recorder, and controller. The output signal is a 4-20 mA control signal, driving the valve toward either the open or closed position.

The pressure loop consists of a pressure transmitter measuring the pneumatic pressure of the I/P valve positioner. In flow loop, water is pumped at a rate determined by the position of the control valve and of a hand-operated stop valve. Flow is sensed by an orifice differential pressure transmitter. The 4-20 mA output loop contains the controller, recorder, and a current-to-pneumatic converter positioner to control the position of the valve.

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