KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 18)

2
DEVICE DESCRIPTION
18
OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
The neck tubes for industrial thermometers for advanced requirements are made of stainless
steel.
The standard neck tube length of a DIN neck tube is 165 mm / 6.5", that of a NUN connection
with ½" NPT thread is 152 mm / 6". Other neck tube lengths are available on request.
2.2.6 Thermowells and thermowell tips
The thermowell is designed to prevent external loads (e. g. static pressure, flowing and
aggressive media) from damaging the measuring insert. As a rule, thermowells are made of the
same material as the system in which the measuring is done. In terms of the material and
design, we can distinguish between two types of thermowells:
• Multipart, welded thermowells
• One-piece bar stock thermowells
This handbook covers thermometers for advanced requirements such as high pressure and high
flow velocities. For this reason, one-piece thermowells manufactured using bar stock are used
in addition to multipart welded thermowells.
Thermowells and thermowell tips in different versions are manufactured for the industrial
thermometers for advanced requirements. For more information refer to
Thermowells:
Diameter, wall thickness, tips on page 60.
All thermowells require a measuring insert with a diameter of 6 mm / 0.24".
INFORMATION!
The neck tube material may differ from the thermowell material.
INFORMATION!
The manufacturer checks all of the thermowells for leaks. An optional certified pressure test is
available for a fee.
Thermowell/thermowell tip Ø Similarity to
standard
[mm] ["]
Straight, multipart, welded 9 / 10 / 11 /12 0.35 / 0.39 / 0.43 /
0.47
DIN 43772, Form 5
and 8
Straight, one-piece 17 / 23 0.67 / 0.91 DIN 43772, Form 6, 7
and 9
16 / 19 0.63 / 0.75 ASME
Conical, one-piece 24 to 12.5
0.94 to 0.49
DIN 43772, Form 4
and 4F
16 to 13 0.63 to 0.51 ASME
19 to 16 0.75 to 0.63
22 to 16 0.87 to 0.63
25 to 19 0.98 to 0.75
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