This assignment is a relatively simple LabView VI based control and instrumentation system that might be used to control a water tank in an industrial process.

Learning Outcomes:

LO$1-$ Use LabView to design a simple control and instrumentation system simulation.

Coursework Specification and Marking Scheme

System description

A water supply control system is shown in Fig$\mathrm{.}1.$ The tank of height $100$ cm is fitted with three liquid level sensors $L1,L2$ and L $3$ at $10cm,30cm$ and $90$ cm respectively. Each sensor output is $"1"$ when the sensor is merged in the water, otherwise the output is $"0".$ A control valve is equipped to inlet water, while a pump is equipped to outlet the water. An alarm is used to report emergent state. As the tank is open air, the water in the tank evaporates.

Operational rules

If the water level up to $L3,$ the control valve will stop.

If the water level falls below L$1,$ the pump will stop, and the alarm should sound.

If the valve is open and there is no rise in the level of water $($i$.$e$.$ there is no incoming water$)$ then the alarm should sound as well and the valve should close after displaying the appropriate error message.

Normally water level is between L$2$ and L$3.$ When the level drops from L$3$ to L$2,$ the valve does not open, and it opens when the level merges L$2$ or lower than L$2.$

An operator should be able to press a button to request that the pump turns on or off, if the system is in a state where that action is allowed.

$2$

CS CamScanner

Tasks

Design a front panel to indicate water level position and moving direction, sensors state, valve state, alarm state, and power state. Also display any necessary control button, etc.

Design block diagrams to implement control system functions to achieve the operational rules listed above. The block diagram should be divided into two parts: one part presenting the physical system; the other presenting the system control circuit. Due to that the physical system and the control section are in different places, the two parts must not be mixed.

Water evaporate rate, the valve flow rate and pump flow rate are not given and need the designer to set proper values. It is suggested the pump rate is higher than the pump rate, and the evaporate rate is much lower. The water level should be simulated moving up or down smoothly with proper speed.

Start the simulation by setting water level at $0$ cm $.$

Use the decorative items provided by LabVIEW to make your front panel looks professional.

Write a report using the templet provided in the Canvas.