To Ensure Accurate Temperature Sensor Measurement
From choosing the right temperature sensor for your particular process application to the periodic recalibration of that temperature sensor, these tips can help you ensure temperature measurement accuracy and get the most out of your process.
BY GARY BARNHARD ANDRICHARD C. PALUCH, CONAX TECHNOLOGIES LLC
Ten Tips to Ensure Accurate Temperature Measurement - Bulletin 6051 - 7421 C
areful selection andinstallation of temper-ature
sensors can en-sure accurate
sensor performance, which in turn improves product quality and
TIP 1:
Select the Correct Sensor Assembly for the Application Type T is preferred for lower temperatures, including subzero (-330°F [-200°C]), and is resis-tant to corrosion in moist atmo-spheres. In air or oxidizing atmo-spheres, however, oxidation of the copper thermoelement occurs at This may seem self-evident, but it is surprising how often process the wrong
thermocouple type.Factors such as time at tempera-ture, degree of accuracy, thermal cycling rate and environment may impact the selection of the best
thermocouple type to produce ac-curate, reliable, long-term perfor-mance.For most applications with op-erating temperatures of 1,400°F (760°C) or less, any of the base metal calibrations (J, E, T and K) will function, but all are not created equal.Type J offers the widest range of environments, including vacuum, oxidizing reducing and inert at-mospheresover the tempera-ture range of 32 to 1,400°F (0 to 760°C). Above 1,000°F (538°C), however, the iron leg is susceptible to rapid oxidation, and below 32°F, the iron experiences rusting and embrittlement.
Key Learning Outcomes: Equipment Covered: Industries Served
Understanding measurement accuracy and selecting the proper temperature
sensors can improve product quality Types E, J, K, T, R, S, B and C
thermocouples (temperature
sensors), leadwire, insulation. Power Generation, Oil and Gas, Semiconductor, Furnace and Autoclave, Pharmaceautical, General Industrial.
