KROHNE OPTITEMP TRA-TCA EN - Manual (Page 23)

INSTALLATION
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OPTITEMP TRA/TCA
www.krohne.com 08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
Insertion length of the thermowell or measuring insert
The "insertion length" of the thermowell or measuring insert refers to the distance from the seal
of the process connection (for G threads), two-thirds of the thread height (for NPT threads) or the
bottom of the flange (for flange thermometers) to the tip of the thermowell or immersion tube.
This length determines how far the sensor projects into the measured medium. To avoid
measurement errors, ensure that the insertion length ("b" in the drawing below) meets the
following requirements:
• Insertion length = 10...15 x thermowell diameter, but at least 100 mm / 3.94" (shorter
insertion lengths are possible but they impair measuring accuracy).
• Tubes with Ø < 300 mm / 11.8": thermowell tip should project past the middle of the pipe if
possible.
INFORMATION!
For more information on the maximum insertion length, please refer to the subsection "Typical
load types".
.book Page 23 Tuesday, August 17, 2010 12:18 PM