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Applying CPI Temperature Sensors

By Khoi Nguyen, Emerson Process Management |

When selecting a temperature sensor, don’t fall back on outdated rules of thumb that may no longer be valid, or ‘plug and play’ solutions that may not be applicable Temperature is a critical measurement in the chemical process industries (CPI). If a measurement is not accurate or reliable, or the sensor is incorrectly chosen, it can cost a company thousands of dollars in wasted steam, extra feedstock or rejected product. Sometimes even a few degrees of error in a temperature measurement can be very expensive. Therefore, it pays to ensure that temperature measurements are reliable and accurate. Selecting the correct sensor isn’t just a “plug and play” procedure, where an engineer orders his or her favorite thermocouple (T/C) and a 4-in. flanged thermowell for every 6-in. pipe. The process includes picking the correct thermocouple or resistance-temperature-detector (RTD) sensor, sizing the thermowell, deciding how and where to mount the sensor, choosing the type of transmitter to be used, specifying the method of transmitting the sensor signal back to the control room, and evaluating the kinds of diagnostic capabilities to be used. What are you measuring? It all starts with a piping and instrumentation (P&ID) diagram…
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