KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 27)

INSTALLATION
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OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
3.4 Proper installation
3.4.1 Possible installations
Installations include the parameters "installation site", "installation angle" and "insertion
length". Depending on the space available and the diameter of the pipe, three installations are
recommended for pipes with flowing product:
• Small pipe diameter: Installation directly against the direction of flow in a bend in the
pipe (1).
• Small pipe diameter: Installation diagonally against the direction of flow, if a bend in the pipe
is available (2).
• Large pipe diameter: Vertical installation, if flow-induced periodic vortex shedding does not
cause the thermometer to vibrate in its resonance frequency (3).
Permitted insertion length of the thermowell or measuring insert Permitted insertion length of the thermowell or measuring insert Permitted insertion length of the thermowell or measuring insert Permitted 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 sheath. This
length determines how far the sensor projects into the measured medium.
CAUTION!
Take the following points into consideration prior to installing the thermometer:
• The dimensions of the thermowell (length, diameter, wall thickness, type of tip) comply with
the requirements of the measuring point. The mechanical load as a result of flowing media,
vibration and resonances is the focus here. In addition, incorrect dimensions can lead to
measurement errors.
• The thermowell is sufficiently resistant to chemically aggressive media (refer to the generally
accessible corrosion tables). Otherwise, corrosion may occur or the medium may penetrate
into the thermowell. When in doubt, select a thermowell made from the same material as
your system.
Figure 3-1: Recommended installations
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