RTD cables manufactured by Tefkot Cable Company are used as connecting lead wire between RTD sensor and temperature indicator device. RTD Cables are made in 2 core, 3 core, 4 core and 6 core configurations, 3 cores being the most commonly used configuration.
CONSTRUCTION :- RTD Cables are made in three common constructions for making them suitable
for
different situations. These are PTFE/PTFE = This is the most common construction. In this the
cores are insulated with PTFE and then cores are twisted and jacketed with PTFE. PTFE/Fg = In
this construction cores are of PTFE and jacket is of Fiber glass braid. This is used when RTD
cable has to be installed in high temperature environment.
PTFE/SPC/PTFE :- In this construction a SPC wire braid shield is provided between
twisted cores
and jacket. This type of Cable is used where higher accuracy is required. The current and
voltage signals in RTD Cables are of very small magnitude and can get affected by external
electromagnetic noises produced by external devises such as motors, electronic equipments etc
near the cable. The SPC Shield is grounded from one end and this protects the signals in the
cable from these external noises.
In all these configurations, an additional SS wire braid Armoring can be provided to increase the mechanical toughness of the cable.
|
S. No.
|
SIZE
(AWG)
|
Conductor
Dia (mm) |
Conductor Resistance (OHM/Km) max at 20°C
|
NOMINAL DIA OF FINISHED CABLE (mm)
|
|||||||||||
|
PTFE / PTFE
|
PTFE / Fg
|
PTFE / SPC / PTFE
|
|||||||||||||
|
2
CORE
|
3
CORE
|
4
CORE
|
6
CORE
|
2
CORE
|
3
CORE
|
4
CORE
|
6
CORE
|
2
CORE
|
3
CORE
|
4
CORE
|
6
CORE
|
||||
|
1
|
28/7/36 SPC ET
|
0.39
|
210.5
|
1.69
|
1.95
|
2.15
|
2.5
|
1.6
|
1.85
|
2.10
|
2.4
|
2.09
|
2.35
|
2.55
|
2.9
|
|
2
|
26/7/34 SPC ET
|
0.48
|
133.7
|
1.85
|
2.10
|
2.35
|
2.80
|
1.75
|
2.00
|
2.30
|
2.70
|
2.25
|
2.50
|
2.75
|
3.20
|
|
3
|
24/7/32 SPC ET
|
0.60
|
83.2
|
2.06
|
2.35
|
2.65
|
3.13
|
1.96
|
2.25
|
2.60
|
3.03
|
2.46
|
2.75
|
3.05
|
3.53
|
|
4
|
22/19/34 SPC ET
|
0.80
|
49.8
|
2.42
|
2.77
|
3.15
|
3.71
|
2.32
|
2.67
|
3.10
|
3.61
|
2.82
|
3.17
|
3.55
|
4.11
|
