KROHNE OPTITEMP TRA-TCA Plus EN - Manual (Page 17)

DEVICE DESCRIPTION
2
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OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
2.2.5 Neck tubes
The neck tube connects the process connection (i.e. screw socket or flange) to the connection
head. Its function is to largely thermally decouple the connection head so that it and any existing
temperature transmitter do not heat up too much. Depending on both the standard and the
version of the thermowell, there are different threads:
Available in both head-mounted and rail-
mounted version Only available in rail-mounted version
TT 10 C/R (analogue, standard, 4...20 mA) TT 31 R (3-wire circuit, 0/4...20 mA, outputs:
0/1...5 VDC, 0/2...10 VDC)
TT 11 C/R (analogue, 3- or 4-wire circuit, output:
0...10 VDC)
TT 32 R (4-wire circuit, 0/4...20 mA, outputs:
0/1...5 VDC, 0/2...10 VDC)
TT 20 C/R (analogue, 4...20 mA)
TT 30 C/R (digital, 4...20 mA, standard)
TT 40 C/R (digital, 4...20 mA, precise)
TT 50 C/R (digital, 4...20 mA, HART ® )
TT 51 C/R (digital, 4...20 mA, HART ® , SIL2)
TT 60 C/R (digital, Profibus-PA)
INFORMATION!
Consult the relevant transmitter handbook for more detailed information on the temperature
transmitters.
INFORMATION!
The thread for the connection head is the top thread in the following drawing. The dimension "a"
denotes the length of the neck tube.
Figure 2-6: Thread types on neck tubes
1 DIN neck tube, process connection with metric thread (left) and NPT thread (right)
2 DIN neck tube, process connection with union nut
3 ASME neck tube with Nipple-Nipple (NN) connection
4 ASME neck tube with Nipple-Union-Nipple (NUN) connection
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