Product Description
24AWG Alumel chromel type K thermocouple alloy wire 0.5mm
Thermocouple wire allows temperatures to be measured electronically. A typical thermocouple construction consists of a pair of dissimilar metals that are electrically joined together at the sensing point and connected to a voltage measuring instrument at the other end. When one junction is hotter than the other, a thermal "electromotive" force (in millivolts) is produced that is roughly proportional to the difference in temperature between the hot and cold junctions.
Thermocouple grade wire is wire that is used to make the sensing point (or probe part) of the thermocouple. Extension grade wire is only used to extend a thermocouple signal from a probe back to the instrument reading the signal. The extension grade wire typically will have a lower ambient temperature limit in which the wire may be used. Namely, it may pass a signal representing a higher temperature as received from the probe, but the wire physically may not be exposed to higher temperatures. Thermocouple wire may be used as extension wire, but extension grade wire may not be used in the sensing point (or probe part) of the thermocouple. Part numbers for extension wire typically begin with an "EX" prefix.
NiCr-NiSi (Type K) thermocouple wire finds the widest use in all basemetal thermocouple, at temperature above 500 °C.
Type K thermocouple wire has strong resistance to oxidation than other base metal thermocouples. It has high EMF against Platinum 67, excellent temperature accuracy, sensitivity and stability, with a low cost. It is recommended for oxidizing or inert atmospheres, but cannot be used directly in the following cases:
(1) Alternatively oxidizing and reducing atmosphere.
(2) Atmosphere with sulphur gases.
(3) Long time in vacuum.
(4) Low oxidizing atmosphere such as hydrogen and carbon monoxide atmosphere.
Detailed Parameter
|
Chemical Composition for thermocouple wire
|
Conductor Name |
Polarity |
Code |
Nominal Chemical Composition /% |
Ni |
Cr |
Si |
Ni-Cr |
Positive |
KP |
90 |
10 |
-- |
Ni- Si |
Negative |
KN |
97 |
-- |
3 |
|
Working Temperature
of thermocouple wire
|
| Diameter/mm |
Long time Working temperature /ºC |
Short period Working temperature /ºC |
0.3 |
700 |
800 |
0.5 |
800 |
900 |
0.8,1.0 |
900 |
1000 |
1.2,1.6 |
1000 |
1100 |
2.0,2.5 |
1100 |
1200 |
3.2 |
1200 |
1300 |
Application of thermocouple wire:
1. Heating - Gas burners for ovens
2. Cooling - Freezers
3. Engine protection - Temperatures and surface temperatures
4. High temperature control - Iron casting
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