KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 11)

DEVICE DESCRIPTION
2
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OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
2.2 Device description
2.2.1 Design of industrial thermometers for advanced requirements
All thermometers for advanced requirements consist of a thermowell with process connection, a
neck tube and a connection head. The connection head and the thermowell are largely thermally
decoupled by way of the neck tube. The neck tubes for thermometers with advanced
requirements are available with two different thread types:
• As per DIN: M24 x 1.5 mm
• As per ASME/ANSI: ½" NPT
The connection head is screwed onto the neck tube using the thread. The M24 x 1.5 thread
makes it possible to align the connection head so that the cable gland always faces in the desired
direction (during assembly, the connection head is aligned first before screwing in the thread
using hex nut). In contrast, the alignment of the connection head with ½" NPT threads is only
possible to a limited extent, depending on the type of neck tube.
You can insert either a measuring insert with RTD (OPTITEMP TR 100) or with thermocouple
(OPTITEMP TC 100) into the thermometer assembly. Both measuring inserts are available in
three different versions (for more information see refer to
Measuring insert designs and
measuring insert length on page 14), the manufacturer also offers a variety of thermowell tips
(for more information see refer to
Thermowells and thermowell tips on page 18).
INFORMATION!
In this documentation, the name "Industrial thermometer for advanced requirements" refers to
thermometer assemblies with multipart, welded thermowells as well as those with one-piece
bar stock thermowells.
Figure 2-1: Design of an industrial thermometer for advanced requirements
1 Connection head cover
2 Measuring insert
3 Cable gland M20 x 1.5 (only available if the process connection has the dimensions M24 x 1.5, otherwise there is a blind
plug here instead)
4 Neck tube
5 Connection head
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