IEC Standard Color Coding Green And White K Type Thermocouple Cable
With FEP Insulation 0.5mm Single Conductor
Selecting the right thermocouple cable is critical for accurate
temperature sensing in industrial, automotive, and scientific
applications. Below is a step-by-step framework based on technical criteria and real-world considerations:
Thermocouple cables must use compensating wires with the same Seebeck coefficient as the thermocouple alloy to
avoid voltage offsets.
Choose insulation based on continuous operating temperature and chemical exposure:
- High-Temp (>500°C):
- Mineral Insulated (MI): MgO powder + stainless steel sheath (200-1300°C, ATEX/IECEx
certified for explosion zones).
- FEP/PTFE: 200-260°C, resistant to acids (e.g., chemical reactors).
- Mid-Temp (100-500°C):
- Silicone Rubber: 180°C, flexible for moving machinery (e.g., conveyor belts).
- Teflon Fiberglass: 250°C, abrasion-resistant (metal casting).
- Low-Temp (<100°C):
- PVC: 70°C, cost-effective for indoor use (e.g., food processing).
- Moisture/Corrosion:
- Use stainless steel (IP67/IP68) for wet environments (e.g., steam pipes).
- Add ethylene propylene rubber (EPR) jacket for saltwater resistance (marine boilers).
- EMI/RFI Interference:
- Shielded cables (braided copper or aluminum foil) reduce noise in high-voltage
areas (e.g., near motors). Shielding effectiveness: braid (85-90%)
> foil (95-98%).
- Twisted pairs (30 twists/m) further minimize inductive coupling (ASTM E1137
standard).
- Mechanical Stress:
- interlocking metal tape for crush resistance (construction
equipment).
- Flexible silicone (5 million bend cycles) for robotics or rotating machinery.
- Gauge (AWG):
- Smaller gauge (24-26AWG) for short runs (<10m, e.g., lab
instruments).
- Larger gauge (18-20AWG) for long distances (>50m) to reduce
voltage drop (e.g., power plants).
- Jacket Color Coding:
- Follow ANSI/ISA standards (e.g., K-type = red(+) / white(-), J-type
= black(+) / white(-)) for quick identification.
- Termination:
- Molded connectors (e.g., M12 for automation) vs. stripped ends (for
custom assemblies). Pre-terminated cables reduce installation
errors by 60% (Field Report, 2024)
K-type (nickel chromium nickel aluminum) cable (KX)
Core features: ± 2.2 ° C error (1000 ° C), oxidation resistance,
high cost-effectiveness
Typical scenario:
▶ Industrial furnace/boiler (800-1200 ° C): cement plant rotary
kiln (resistant to dust and high temperature)
▶ Automotive engine testing: cylinder body temperature monitoring
(wide temperature range of -40 ° C to 1000 ° C)
▶ Error case: A power plant mistakenly used BX cable (B-type
compensating wire), resulting in a false increase of 15 ° C in
furnace temperature and a decrease in combustion efficiency
Color coding:
Applications:
Thermocouple cable has a wide range of applications, including:
- Industrial manufacturing:
- Metallurgy: In steelmaking, ironmaking, and other metallurgical processes,
thermocouple cables are used to monitor the high temperatures in
furnaces, such as blast furnaces, electric furnaces, and
converters. This helps to control the smelting process and ensure
the quality of the metal products.
- Chemical industry: Chemical reactions often occur under specific temperature
conditions. Thermocouple cables are used to measure the temperature
in reactors, distillation columns, and other equipment to ensure
the normal progress of chemical reactions and the safety of the
production process.
- Ceramics and glass manufacturing: The production of ceramics and glass requires high-temperature
firing and melting processes. Thermocouple cables are used to
monitor the temperature in kilns and furnaces to control the firing
temperature and ensure the quality of the products.
- Power generation: In power plants, thermocouple cables are used to measure the
temperature of boilers, steam turbines, and other equipment to
monitor the operating status of the equipment and ensure the safe
and efficient operation of the power generation system.
- Automotive industry: Thermocouple cables are used in the automotive industry to
measure the temperature of engine exhaust gases, catalytic
converters, and other components. This helps to monitor the
performance of the engine and the emission control system, and is
also used in the testing and development of new automotive engines.
- Aerospace industry: In the aerospace field, thermocouple cables are used to measure
the temperature of aircraft engines, rocket engines, and other
high-temperature components. This is crucial for ensuring the
safety and reliability of aerospace vehicles during flight.
- Food industry: In the food processing industry, thermocouple cables are used to
measure the temperature of ovens, sterilization equipment, and
other processing equipment to ensure the safety and quality of food
processing.
- Laboratory and scientific research: Thermocouple cables are widely used in laboratories and
scientific research institutions for temperature measurement in
various experiments and research projects. For example, in material
research, chemical experiments, and biological research,
thermocouple cables are used to measure the temperature of samples
and reaction systems.
- HVAC systems: In heating, ventilation, and air conditioning systems,
thermocouple cables are used to measure the temperature of air,
water, and other media to control the operation of the system and
ensure the comfort of the indoor environment.
The cables are also available in different configurations,
including grounded, ungrounded, and exposed junctions, to suit
specific application requirements. Grounded junctions provide
faster response times but are more susceptible to electrical noise,
while ungrounded junctions offer better electrical isolation but
slower response times. Exposed junctions are used when the fastest
response time is needed, but they are more vulnerable to damage.
Overall, K type thermocouple cables are a critical component in
temperature measurement systems, providing durability, accuracy,
and versatility across a wide range of applications.
FAQ:
Q: What is the brand name of this Thermocouple Cable?
A: The brand name of this Thermocouple Cable is Tankii.
Q: What are the different model numbers available for this
Thermocouple Cable?
A: The different model numbers available for this Thermocouple
Cable are KX/KC, JX, EX, TX, NX, SC
Q: Where is this Thermocouple Cable manufactured?
A: This Thermocouple Cable is manufactured in China.
Q: What are the temperature ranges supported by this Thermocouple
Cable?
A: The temperature ranges supported by this Thermocouple Cable vary
depending on the model number. Please refer to the product
specifications for more information.
Q: Is this Thermocouple Cable suitable for use in harsh industrial
environments?
A: Yes, this Thermocouple Cable is designed to be durable and
reliable in harsh industrial environments.
