Basic process control system

Temperature Controller

temperature control. is a system that involves the transfer of heat from one substance to another substance. Thermal systems can be analyzed in terms of resistance and capacitance, although the heat capacitance and thermal resistance can not be accurately represented as a lumped parameter because usually both of these quantities are distributed throughout the material. for accurate analysis, a distributed parameter model should dignakan. here, however, to simplify the analysis, we will anngap that thermal systems can be represented by the model parameters tegumpal, that material featured by the resistance to heat flow with heat capacitance is negligible and that the material is characterized by the heat capacitance resistance can neglected to heat flow. there are three different ways in which heat can flow from one material to another material.

Process Level Control

1. A level transmitter (LT), a level controller (LC), and a control valve (LV) are used to control the liquid level in a process tank.
2. The purpose is to maintain the liquid level at some prescribed height (H) above the bottom of the tank.It is assumed that the rate of flow into the tank is random.
3. the level transmitter is a device that measures the fluid level in the tank and converts it into a useful measurement signal, which is sent to a level controller.
4. The level controller evaluates the measurement, compares it wiyh a desired set point (SP), and produces a series of corrective action that are sent to the control valve.
5. The valve controls the flow of fluid in the outlet pipe to maintain a level in the tank.

process temperature control