Loop is a place to place or measure and compensate for any disturbances that can affect the value of the process variable that we are controlling.
“Instrument loops” or “Process control loops” are series of instruments, equipment and transmission media which when properly linked together with a process can keep the process variable at the desired value.
Five Element Loop Control
A control loop has five basic elements, as follows:
- Transmitter - Is a device that measures the values of the process and sends a signal to the controller. In the previous level process, the transmitter will measure the fluid level in the vessel.
- Controller - Is a device that detects any real differences in the value of the process and the desired value. In our example, it is the difference between the level of liquid in the vessel and the desired level, the controller will detect an "error" and need to adjust the last control element.
- Final Control Element - This element has various forms, namely valve, damper or fired heater. The function of the final control element is to manipulate the amount of material or energy that enters the process, so that the process can be maintained at a stable value
- Process - Process is a condition in industrial plants that must be maintained in order to produce a uniform product. Flow level, temperature, and pressure are the four most important industrial processes. Others include pH, composition, and radiation. In some cases, if all processes in the plant can be maintained properly it can produce products that are of high quality, consistent and more effective in using materials and energy can be realized.
- Transmission medium - All information must be sent to the controller then from the last controller element or valve to have a regulatory effect. This is a function of the transmission medium which is usually a pneumatic and / or electronic signal.
Many of us often ignore the mirror that hangs or sticks on the wall. However, actually we, especially women, need to be careful with mirrors, especially mirrors installed in guest rooms or public toilets because two-way mirrors are very difficult to distinguish from ordinary mirrors. The two-way mirror I mean here where someone behind the mirror can see you and you can't see it.
Here's how to recognize a two-way mirror:
Place the tip of your nail on the mirror surface, if there is a gap between your nail and the image of your nail, it is the real mirror. However, if your nails are directly in contact with the image then it is a two-way mirror. For more details, you can observe carefully the image below:
how to recognize a two-way mirror
Do this test a few moments before you go out in front of the mirror. Crime using two-way mirrors is increasing, so it's best if you share this information with your relatives, wife, daughter, and friends.
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