Introduction:
J-type thermocouple bare wire is one of the commonly used
thermocouple temperature measurement devices in the metal smelting
process. It is composed of iron-copper alloy wire and copper-nickel
alloy wire, and measures temperature changes through the
thermoelectric effect.
The structure of the J-type thermocouple bare wire is relatively
simple and consists of two alloy wires. One end of the two wires is
connected together to form a measurement point, and the other end
is connected to a temperature transmitter or data acquisition
system. The measuring point is exposed to the environment to be
measured, and temperature changes will cause a slight potential
difference between the alloy wires. By measuring this potential
difference, the temperature of the environment can be accurately
calculated.
Iron-copper-nickel thermocouple (J-type thermocouple) is also
called iron-constantan thermocouple. The nominal chemical
composition of its positive electrode (JP) is pure iron.
The negative electrode (JN) is a copper-nickel alloy, often vaguely
called constantan. Its nominal chemical composition is 55% copper
and 45% nickel, as well as a small but very important amount of
cobalt, iron, manganese and other elements. Although it is called
Constantan, but is different from nickel-chromium-constantan and
copper-constantan, so it cannot be replaced by EN or TN.
Iron-Constantan thermocouples cover the measurement temperature
range from -210 to 1200°C, but are typically used in the
temperature range 0-750°C.
J-type thermocouple bare wire is widely used in metal smelting and
is suitable for temperature monitoring and control in
high-temperature environments. It is usually able to measure the
temperature range from 0 degrees Celsius to 750 degrees Celsius,
with high accuracy and stability.
Application:
Metal smelting is the process of heating ore or waste to high
temperatures to melt it and extract the desired metal. In this
complex process, temperature monitoring and control are crucial to
ensure the efficiency and quality of the smelting process, and
J-type thermocouple bare wire is one of the widely used temperature
measurement tools.
1. Melting process monitoring:
J-type thermocouple bare wire is used to monitor the melting
temperature during metal smelting. By inserting J-type thermocouple
bare wire into the smelting furnace or smelting equipment, the
temperature of the metal molten pool can be measured in real time.
Accurate temperature measurement helps control heating and cooling
rates during the smelting process, ensuring metal smelting reaches
the required temperature range and time.
2. Temperature control and regulation:
The temperature measurement results of J-type thermocouple bare
wire can be used to control the heating and cooling system during
the melting process. By monitoring temperature changes in real time
and comparing with the set temperature target, the heating power or
cooling rate can be automatically adjusted to keep the melting
temperature within the required range. This helps improve the
stability and consistency of the smelting process.
3. Alloy composition control:
Temperature measurements from J-type thermocouple bare wires can
also be used to control the composition of metal alloys. During the
metal smelting process, the composition of the alloy is critical to
the performance and quality of the final product. By measuring the
temperature changes during the smelting process, the composition of
the metal alloy can be inferred based on the thermoelectric
potential output of the thermocouple, and the necessary alloy
ingredients and adjustments can be made.
Advantage:
J-type thermocouple bare wire has many advantages when used in
metal smelting. First of all, it has good adaptability to oxidizing
atmospheres and high-temperature environments, and can work stably
and reliably in the metal smelting process. Secondly, J-type
thermocouple bare wire has high measurement accuracy and can
accurately monitor temperature changes during the metal smelting
process. In addition, J-type thermocouple bare wire has a fast
response speed and is suitable for metal smelting control that
requires real-time performance.
In short, J-type thermocouple bare wire plays an important role in
the metal smelting process and is used to monitor and control the
temperature during the smelting process. Accurate temperature
measurements can help control heating and cooling systems during
the smelting process, ensuring that metal smelting reaches the
required temperature range and time. In addition, temperature
measurements can be used to control alloy composition to ensure the
performance and quality of the final product. The application of
J-type thermocouple bare wire in metal smelting helps to improve
the efficiency, stability and consistency of the smelting process.
Relevant specific parameters:
- Temperature range: -40°C to 750°C (-40°F to 1382°F)
- Thermoemf output: Varies based on temperature changes, usually in
the microvolt (μV) level.
- Linear characteristics: has good linear characteristics.
- Sensitivity: Varies based on specific model and manufacturer.
Code | Wire Component of the thermocouple |
+Positive leg | - Negative Leg |
N | Ni-Cr-Si(NP) | Ni-Si-magnesium (NN) |
K | Ni-Cr(KP) | Ni-Al(Si) (KN) |
E | Ni-Cr(EP) | Cu-Ni (EN) |
J | Iron (JP) | Cu-Ni (JN) |
T | Copper (TP) | Cu-Ni (TN) |
B | Platinum Rhodium-30% | Platinum Rhodium -6% |
R | Platinum Rhodium-13% | Platinum |
S | Platinum Rhodium -10% | Platinum |
| ASTM | ANSI | IEC | DIN | BS | NF | JIS | GOST |
| (American Society for Testing and Materials) E 230 | (American National Standard Institute) MC 96.1 | (European Standard by the International Electrotechnical Commission
584)-1/2/3 | (Deutsche Industrie Normen) EN 60584 -1/2 | (British Standards) 4937.1041, EN 60584 - 1/2 | (Norme Française) EN 60584 -1/2 - NFC 42323 - NFC 42324 | (Japanese Industrial Standards) C 1602 - C 1610 | (Unification of the Russian Specifications) 3044 |
Using Occastion of Different Thermocouple |
Thermocouple Type | Working Atmosphere | Working Temperature |
Type K | KP | Oxidizing | -200 to +1200℃ |
KN | Inert |
Type N | NP | Oxidizing | -200 to +1200℃ |
NN | Oxidizing |
Type E | EP | Oxidizing | -200 to +900℃ |
EN | Oxidizing |
Type J | JP | Oxidizing(use in high temp) | -40 to +750℃ |
JN | Reducing, Inert, Vacuum |
Type T | TP | Oxidizing,Vacuum | -200 to +350℃ |
TN | Reducing, Vacuum |
| Diameter/mm | Long time Working | Short period Working |
| temperature/°C | temperature/°C |
| 0.3,0.5 | 300 | 400 |
| 0.8,1.0,1.2 | 400 | 500 |
| 1.6,2.0 | 500 | 600 |
| 2.5,3.2 | 600 | 750 |
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