Introduction:
Type J thermocouple bare wire is a commonly used thermocouple type
used for temperature measurement and control. 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 industrial control
fields, including heating equipment, furnace temperature monitoring
and heat treatment processes. It is also widely used in
environmental monitoring, such as weather stations, greenhouses and
warehousing environments. In scientific research and laboratories,
J-type thermocouple bare wires are often used to measure sample
temperature and conduct thermodynamic experiments.
One of the advantages of Type J thermocouple bare wire is its
corrosion resistance, enabling temperature measurement in some
humid and corrosive environments. In addition, J-type thermocouple
bare wire has fast temperature response capability and can quickly
respond to temperature changes.
Characteristic:
- Thermocouple material: J-type thermocouple bare wire is composed of
ferritic stainless steel (Fe-Cr-Al alloy) and copper-nickel alloy
(Constantan). Fe-Cr-Al alloy is the positive electrode of J-type
thermocouple, and Constantan is the negative electrode.
- Temperature range: Type J thermocouple bare wire is suitable for
medium temperature ranges, typically measuring temperatures from
-40°C to 750°C (-40°F to 1382°F).
- Linear characteristics: J-type thermocouple bare wire has good
linear characteristics within its operating temperature range and
can provide relatively accurate temperature measurements.
- Low drift: J-type thermocouple bare wire has low drift
characteristics and can maintain relatively stable temperature
measurements.
Advantage:
- Widely used: J-type thermocouple bare wire is one of the commonly
used thermocouple types and is widely used in industrial control
and laboratory environments.
- Corrosion resistance: J-type thermocouple bare wire has good
corrosion resistance and is suitable for temperature measurement in
some humid and corrosive environments.
- Fast response: J-type thermocouple bare wire has fast temperature
response capability and can quickly reflect temperature changes.
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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Specific application areas:
- Industrial control: J-type thermocouple bare wire is widely used in
industrial control fields, including heating equipment, furnace
temperature monitoring, heat treatment processes, etc.
- Laboratory research: J-type thermocouple bare wire is widely used
in scientific research and laboratories for measuring sample
temperature, thermodynamic experiments, etc.
- HVAC system: J-type thermocouple bare wire can be used for
temperature monitoring in HVAC systems, such as temperature
control, environmental monitoring, etc.
Q&A:
What is the temperature range of J-type thermocouple bare wire?
Answer: The temperature range of J-type thermocouple bare wire is
usually between -40°C and 750°C.
What are the advantages of J-type thermocouple bare wire?
Answer: J-type thermocouple bare wire has the advantages of wide
application, corrosion resistance and fast response.
What applications are J-type thermocouple bare wire suitable for?
Answer: J-type thermocouple bare wire is suitable for applications
such as industrial control, laboratory research, and HVAC systems.
