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.
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