When the pressure of a material within some vessel falls outside of a specified range of pressures, equipment is prone to inefficient operation, improper operation and failure. Excessively high or low pressure is known to cause catastrophic equipment failure, and in some cases, injury to personnel. Pressure is also used to determine level, especially in large storage tanks. Process temperature is among the most common and important parameters controlled by instrumentation. Many processes require heat for proper operation and must be precisely controlled in many cases.
Many options are available for temperature measurement and control.
Each method presents good and bad points. The predominant method of this parameter is done using a membrane-type sensor, which is either floating or immersed in the process fluid. The proper application and maintenance of these sensors allows significant cost reductions in their use. A familiar example is the application of chlorine to water and wastewater for disinfection. While it is possible to accurately control the application of chlorine using this parameter, Newer and specialized chlorine sensors perform the task more efficiently.