WIKA TR12-M - Handbuch (Seite 14)

GB
4. Design and function
11419904.02 09/2013 GB/D
WIKA operating instructions models TR12, TC12 (Ex d) 14
Variant 3:
The thermometer is fitted to certified equipment (transmitter) with an ignition protection type
of “flameproof”. The thermometer is marked with II 2 G Ex d IIC Tx Gb and is designed for
use in zone 1 with a thermowell. For any potential usage at the partition to zone 0 with a
thermowell, the approvals and conditions of the relevant transmitter must be considered.
4.3 Neck tube versions
4.4 Housing- and connection heads
The dimensions of the housing- and connection heads are given in the respective data
sheet.
Legend:
 Neck tube
 Thread to the thermowell
 Measuring insert
 Thread to the connection head
A(U
2
) Insertion length
(tapered thread)
A(L
1
) Insertion length
(parallel thread)
NL Nominal length
N(M
H
) Neck length
tapered
thread
parallel
thread
14013854.02
parallel
thread
tapered
thread
fabricated neck tube
(neck tube welded)
“nipple-union-nipple”
neck tube
tapered
thread
parallel thread with
counter nut