The figure1 shows a simple level-control system in which a closed relay opens the valve and an open relay closes the valve. Input flow is not controlled. The level sensor has a transfer function of Vh=0.8h+0.4. The system uses 12 V supply. The relay closes at 6.x V and opens again at 4.y V. Where X=4 and Y=7 Figure is in image a. Find the value of amplifier gain, K, required to open the valve when the level reaches 1.5 m. b. At what level does the valve close? c. Suppose Q1=5m3⁄min , Q2=2m3⁄min and Qout=9m3⁄min (when open). What is the period of the level oscillation?
Protection System
A system that protects electrical systems from faults by isolating the problematic part from the remainder of the system, preventing power from being cut from healthy elements, improving system dependability and efficiency is the protection system. Protection devices are the equipment that are utilized to implement the protection system.
Predictive Maintenance System
Predictive maintenance technologies are designed to assist in determining the state of in-service equipment so that maintenance can be scheduled. Predictive maintenance is the application of information; proactive maintenance approaches examine the condition of equipment and anticipate when it should maintain. The purpose of predictive maintenance is to forecast when equipment will fail (depending on a variety of parameters), then prevent the failure through routine and corrective maintenance.Condition monitoring is the continual monitoring of machines during process conditions to maintain optimal machine use, which is necessary for predictive maintenance. There are three types of condition monitoring: online, periodic, and remote. Finally, remote condition monitoring allows the equipment observed from a small place and data supplied for analysis.
Preventive Maintenance System
To maintain the equipment and materials on a regular basis in order to maintain those running conditions and reduce unnecessary shutdowns due to unexpected equipment failure is called Preventive Maintenance (PM).
The figure1 shows a simple level-control system in which a closed relay opens the valve and an open relay closes the valve. Input flow is not controlled. The level sensor has a transfer function of Vh=0.8h+0.4. The system uses 12 V supply. The relay closes at 6.x V and opens again at 4.y V. Where X=4 and Y=7
Figure is in image
a. Find the value of amplifier gain, K, required to open the valve when the level reaches 1.5 m.
b. At what level does the valve close?
c. Suppose Q1=5m3⁄min , Q2=2m3⁄min and Qout=9m3⁄min (when open). What is the period of the level oscillation?
d. Design a circuit to interface the sensor with a 6-bit dual-slope analog-to-digital converter (ADC) with a 10-V reference.
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