EAS 199B Lecture 9:     4, 5 February 2013

9. Analysis of mass balance for batch processes; Circuits for solenoid actuation; Installation of solenoid valves on the fish tank.

Class meeting on 4, 5 February 2013

Learning Objectives

1. Be able to identify whether a process is batch, steady flow or unsteady flow.
2. Be able to write the mass balance equations for batch processes.
3. Be able to use a systematic procedure to solve batch mass balance problems.
4. Be able to identify the components in a cascade control circuit
5. Be able to describe the purpose of the flyback diode on a relay coil or solenoid valve.
6. Be able to attach the solenoid valves and supply tanks to the fish tank platform

Notes and Supplemental Files

1. Notes on analyzing mass balance for batch processes (PDF)
2. Slides on cascaded switching circuits PowerPoint or 3-up slides in PDF
3. Hand notes on relays (PDF)
4. Notes on clearance holes for solenoid screws
5. "How to" page on wiring the solenoid valves.

The following video shows three circuits for switching an LED. One circuit uses a digital output pin to directly supply power to the LED. A second circuit uses a transistor to switch the current to the LED. The third circuit uses a transistor to switch a relay.