|
COMPENSATING
CABLES
| Economy
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. |
Applications
Iron and Steel Plants, Non Ferrous metal melting,
Heat Treatment, Cement, Ceramics, Chemical
Plants, Petrochemicals & Fertilizer Plants,
Power Stations, Glass & Food Industries,
Laboratories etc. |
| Conductors
The
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.
|
| Colour
Codes
These
cables are colour coded as per BS 1843 specifications
as a standard practice.
|
| Standard
Wire Gauges
Unless
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
SWG
Flexible Conductors: 3/20, 3/22, 7/22, 7/30,
14/30 or 24/30 SWG.
|
Calibration
Calibration
Code
1) Iron Constantan
(Fe - Constantan)
“J”
2) Copper Constantan
(Cu - Constantan)
“T”
3) Chromel - Alumel
(CR - AL) (Ni. Cr.
- Ni.) “K”
4) Platinum - Platinum
Rhodium 10 %
“R”
5) Platinum - Platinum
Rhodium 13 % “S” |
Insulation
Economy’s Single
Overall
Code
Core
“A”
PVC PVC
“B”
PVC PVS
+ ASBESTOS
“C” TEFLON
TEFLON
“D” FIBREGLASS
FIBREGLASS
“E”
ASBESTOS ASBESTOS
“F” METALLIC
COVERINGS |
| Ordering
Information
1)
Specify calibration
2) Choose the insulation according to
environments.
3) Whether metallic over braided required.
4) Indicate the wire gauge.
5) Specify the quantity and minimum acceptable
Length.
|
| Standard
Packing
100
Meters Spools.
|
For
Computerised Temperature Sensing
And Control
Economy
offers complete line of ‘3 - wire’
thermocouple extension wires
| In
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. Economy’s “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. |
|
PVC
to PVC
Code ‘A’
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. |
PVC
to PVC Plus Overall Asbestos
Code ‘B’
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. |
Teflon
to Teflon
Code ‘C’
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. |
Fibreglass
to Fibreglass
Code ‘D’
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 |
Asbestos
to Asbestos
Code ‘E’
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 |
Metal
Covering
Code ‘F’
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. |
|
CALIBRATION
|
CODE
|
INSULATION
COLOUR CODE
|
|
BS
1843
|
|
+
ve
|
-ve
|
Overall
|
|
Fe-Constantan
|
JX
|
Yellow
|
Blue
|
Black
|
|
Copper
Constantan
|
TX
|
White
|
Blue
|
Blue
|
|
Chromel
Alumel
(CR-AL) or (Ni-Cr-Ni)
|
KX
|
White
|
Blue
|
Red
|
|
Pt
Pt Th 10 %
or
Pt Pt Bh - 13 %
|
RX
|
White
|
Blue
|
Green
|
|
Mineral
Insulated Thermocouple Extension
Wires & Cables
| Mineral
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
to requirements. |
Multipair
Extension Cables
Multipair
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
conduit.
For quotations, please write indicating quantity. |
|
