Thermocouple Alloy Wire
1. Thermocouple Alloy Wire Brief Introduction
Thermocouples are widely used within industry as a method of
measuring temperature and the Thermocouple Wire is the means to
transfer the measurement from the source to the recording
instruments.
The principle of joining two different metals to create a voltage
is the basis for all thermocouples and we manufacture the major
Types and Grades to meet the wide range of applications from small
measuring instruments to heavy chemical and power generation
plants.
2. Thermocouple Alloy Wire Parameter.
3. How To Choose Thermocouple Alloy Wire
Thermocouple wire, thermocouple bare wire type k
1) Type K (Chromel / Alumel)
Type K is the ‘general purpose’ thermocouple. It is low cost and,
owing to its popularity, it is available in a wide variety of
probes. Thermocouples are available in the -200 °C to +1200 °C
range. Sensitivity is approx 41 µV/°C. Use type K unless you have a
good reason not to.
2) Type E (Chromel / Constantan)
Type E has a high output (68 µV/°C) which makes it well suited to
low temperature (cryogenic) use. Another property is that it is
non–magnetic.
3) Type J (Iron / Constantan)
Limited range (-40 to +750 °C) makes type J less popular than type
K. The main application is with old equipment that can not accept
‘modern’ thermocouples. J types should not be used above 760 °C as
an abrupt magnetic transformation will cause permanent
decalibration.
4) Type N (Nicrosil / Nisil)
High stability and resistance to high temperature oxidation makes
type N suitable for high temperature measurements without the cost
of platinum (B,R,S) types. Designed to be an ‘improved’ type K, it
is becoming more popular.
Thermocouple wire, platinum wire
1) Thermocouple types B, R and S are all 'noble' metal thermocouples and exhibit similar
characteristics. They are the most stable of all thermocouples, but
due to their low sensitivity (approx 10 µV/°C) they are usually
only used for high temperature measurement (>300 °C).
2) Type B (Platinum / Rhodium)
Suited for high temperature measurements up to 1800 °C. Unusually
type B thermocouples (due to the shape of theirtemperature /
voltage curve) give the same output at 0 °C and 42 °C. This makes
them useless below 50 °C.
3) Type R (Platinum / Rhodium)
Suited for high temperature measurements up to 1600 °C. Low
sensitivity (10 µV/°C) and high cost makes them unsuitable for
general purpose use.
4) Type S (Platinum / Rhodium)
Suited for high temperature measurements up to 1600 °C. Low
sensitivity (10 µV/°C) and high cost makes them unsuitable for
general purpose use. Due to its high stability type S is used as
the standard of calibration for the melting point of gold
(1064.43°C).
When selecting thermocouple types, ensure that your measuring
equipment does not limit the range of temperatures that can be
measured. Listed below is the range of temperatures that the 8
channel Pico TC-08 can measure.
4. Packing Information
5. Transportation
