KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 19)

DEVICE DESCRIPTION
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OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
2.3 Process connections and areas of application
2.3.1 Weld-in thermometer
Weld-in thermometers for advanced requirements are always the first choice when you want to
measure temperatures in quickly flowing product under high pressure. Compared to threaded
thermometers for advanced requirements, weld-in thermometers are more resilient as they are
not weakened by the notch effect of a thread on the joint.
A typical area of application for weld-in thermometers with advanced requirements is the
measurement of temperature in process vapour lines and cooling water lines, especially in
power plants.
2.3.2 Threaded thermometer
Threaded thermometers with separate neck tubes are particularly well suited to measuring
tasks in process technology or machine building and plant engineering. In this case, screwing
into the pipelines and tanks is the most common process adaption.
The neck tube increases the distance between the process connection and the connection head
so that the latter does not overheat. It also makes it possible to install connection heads outside
of the insulation of pipelines and tanks.
The threaded thermometers for advanced requirements are offered with three different
thermowell shapes forms which are similar to or comply with DIN and ASME standards. These
include a straight thermowell, a conical thermowell and a reduced thermowell. G or NPT thread
variants are available.
Reduced tip, one-piece 12 to 9 0.47 to 0.35 ASME
16 to 13 0.63 to 0.51
19 to 13 0.75 to 0.51
19 to 16 0.75 to 0.63
22 to 13 0.87 to 0.51
23 to 13 0.91 to 0.51
Thermowell/thermowell tip Ø Similarity to
standard
[mm] ["]
INFORMATION!
Both the reduced and the conical tip feature a shorter response time than a straight thermowell.
However, compared to the reduced tip, the conical tip withstands higher pressures.
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