KROHNE OPTITEMP TRA-TCA EN - Manual (Page 29)

INSTALLATION
3
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OPTITEMP TRA/TCA
www.krohne.com 08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
3.6 Installation notes on the individual device classes
3.6.1 Insertion-type thermometer
Insertion-type thermometers can be installed in three different ways:
• Insertion
• Attachment with a compression fitting
• Welding
For fixing, the manufacturer offers two types of compression fitting connections with the threads
G½", G¾", G1", ½" NPT or ¾" NPT (measurement "a" in the following drawing is the "insertion
length"):
• Using a metal ring clamped to the thermowell or measuring insert to prevent any subsequent
movement, thus preventing any change in the immersion depth
• Using a plastic ring which can subsequently move on the thermowell or measuring insert,
allowing changes in the immersion depth
DANGER!
Note that compression fittings with plastic rings are less resistant to pressure and temperature
than compression fittings with metal rings! For information regarding the limit values of
compression fittings, refer to the "Technical Data" section.
INFORMATION!
A thermometer that is welded allows for higher process pressures and temperatures than
thermometers attached with compression fittings.
Compression fitting
1 Thread to screw into the connection head
2 Union nut
3 Compression ring
4 Thread for the union nut
5 Process thread
6 Tightened union nut
.book Page 29 Tuesday, August 17, 2010 12:18 PM