offers wide range of thermocouple extension
wires popularly known as compensating cables
with variety of standard insulations to combat
chemical corrosion, moisture, heat & abrasion
etc. Over and above the metallic coverings
are provided to increase the resistance to
abrasion and mechanical wear and tear. Cables
are also offered to avoid electrical interference
in precision control system.
Iron and Steel Plants, Non Ferrous metal melting,
Heat Treatment, Cement, Ceramics, Chemical
Plants, Petrochemicals & Fertilizer Plants,
Power Stations, Glass & Food Industries,
conductors of thermocouple extension wires
are tested as per requisite BS 1843 Specifications
for their accuracy and are calibrated at
a test temperature of 100 C within + 3 C.
cables are colour coded as per BS 1843 specifications
as a standard practice.
specified, our standard wires are supplied
with flexible 3/22 SWG conductors. However,
the following conductors could also be supplied
for specific requirements.
Solid Conductors: 14, 16, 18, 20 & 22
Flexible Conductors: 3/20, 3/22, 7/22, 7/30,
14/30 or 24/30 SWG.
1) Iron Constantan
(Fe - Constantan)
2) Copper Constantan
(Cu - Constantan)
3) Chromel - Alumel
(CR - AL) (Ni. Cr.
- Ni.) K
4) Platinum - Platinum
Rhodium 10 %
5) Platinum - Platinum
Rhodium 13 % S
2) Choose the insulation according to
3) Whether metallic over braided required.
4) Indicate the wire gauge.
5) Specify the quantity and minimum acceptable
Computerised Temperature Sensing
offers complete line of 3 - wire
thermocouple extension wires
high speed computer control system, the milli
volts signal generated at the thermocouple
junction remotely located must be brought
to the instrument point without any interference
along the extension wire could generate erratic
signals. Economys 3 - wire system
consists of positive and negative conductors
duly insulated with PVC. A copper drain wire
is located along the twisted conductors. This
assembly is further wrapped with aluminised
mylar tape. The complete assembly is PVC coated.
The third wire in this system acts as a common
ground for the sensor and computer. Economy
also offers this type of extension wire having
teflon insulation or fibreglass insulation
where the conductor exposed to high temperature.
Colour Coated Polyvinyl is extruded on the
bare wires individually, both conductors kept
parallel and over jacketed with PVC. Temperature
range - 20 to 200 F. It is economical, withstands
moisture, alkalies, oils, acids, has very
good dielectric and mechanical strength.
to PVC Plus Overall Asbestos
Each conductor is PVC coated. Both are kept
together and are overall PVC covered. Finally
it is coated with asbestos. The cable has
similar advantages like code A
except that it can withstand electrical short
circuits when contacted with hot surfaces.
Conductors are teflon coated individually
and then both kept together are overall teflon
coated. This whole assembly withstands temperature
of 250 C. It also withstands moisture, most
acids & vapours.
Each conductor is covered with impregnated
fibreglass. Both the conductors kept together
are covered with fibreglass and finally impregnated
in varnish. The impregnation improves the
resistance to abrasion and moisture. Impregnation
is permanently destroyed above 200 C
Feltad asbestos is applied on each conductor.
The conductors are placed together and are
overall asbestos covered. This will withstand
continuous temperature upto 500 C
The metallic coverings on any of the standard
thermocouple extension wires will provide
extra resistance to abrasion, mechanical damage
and higher tensile strength. These comprise
of tinned copper wires or galvanised steel
wires generally. Stainless steel metallic
coverings can be provided for specific requirements.
(CR-AL) or (Ni-Cr-Ni)
Pt Th 10 %
Pt Pt Bh - 13 %
Insulated Thermocouple Extension
Wires & Cables
Insulated Thermocouple Extension wires or
Cables can be effectively used in places where
the conventional cables described in this
literature cannot be used due to enviornmental
conditions. Economy offers these mineral insulated
cable with copper metallic sheath. The conductors
with correct composition as used in other
types of thermocouple extension wires are
used here also. The insulation for these cables
in fused magnesium Oxide powder which withstands
high temperatures. Besides, these cables are
annealed to enable the user to bend them according
extension cables can be made to your specific
order with individual and overall insulations
to suit your installation requirements. Such
cables correctly reduce the cost of installation
as compared to pulling separate pairs through
For quotations, please write indicating quantity.