Exam 11: Instruments
The symbol for a shell and tube heat exchanger that is being used as a pre-heater has the arrow:
A
Draw a level control loop.
A level control loop is a feedback control system used to maintain a constant level of a liquid or material in a tank or vessel. It typically consists of a level sensor to measure the current level, a controller to compare the measured level to a setpoint, and a control valve to adjust the flow in or out of the tank.
The level sensor sends a signal to the controller, which then compares the measured level to the desired setpoint. If the measured level is lower than the setpoint, the controller sends a signal to open the control valve, allowing more material to enter the tank. If the measured level is higher than the setpoint, the controller sends a signal to close the control valve, reducing the flow into the tank.
This continuous feedback loop ensures that the level of the tank remains constant, even as conditions change. It is an essential part of many industrial processes, such as chemical manufacturing, water treatment, and food production. A well-designed level control loop helps to maintain product quality, optimize production efficiency, and prevent spills or overflows.
A nutating disc meter is composed of all the following components except:
The primary elements used to detect indirect level measurements include all of the following except:
When an operator selects the desired process variable on a controller, it is referred to as:
The primary elements used to detect pressure measurements include all of the following except:
The primary elements used to detect direct level measurements include all of the following except:
A corrugated metal tube that contracts and expands in response to pressure changes:
A computer graphics display is an electronic process flow diagram used to simplify console operations.
Weir and flume flow and level measuring devices are used to calculate flows that are not enclosed in pipes:
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