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Protecting Instruments from Overpressure

By Ehren Kiker |

Overpressure in a process can damage the seals in a pressure instrument’s sensor or skew the zero point. Here’s how to avoid the problem Pressure is one of the most commonly measured variables in the chemical process industries (CPI). Accuracy and, more importantly, stability are critical to maintaining a safe, reliable process and maximizing uptime. Modern pressure instruments are highly accurate and provide excellent long-term stability, with a variety of diagnostics to provide greater insight into the process, but they are still highly susceptible to overpressure events. By better understanding the application and the sources of overpressure, as well as knowing options available from manufacturers, process engineers can better avoid the possibility of costly process problems caused by overpressure.   Pressure measurement Pressure is typically measured by an instrument with a sensor and a transmitter. The sensor interfaces to the process to determine the pressure and sends this value to the transmitter. The transmitter converts the signal from the sensor to a type suitable for transmission to a control and monitoring system, such as 4–20 mA or a digital fieldbus-communications protocol. Modern electronic pressure…
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