Professional Custom Industrial Thermocouple for High Temperature Measurement

Product Description

Product Introduction
Thermocouple is the core sensing element for industrial temperature measurement. Composed of two different metal conductors forming a closed loop, it can directly measure the temperature of liquids, gases, steam and solid surfaces within the range of 0~1800ºC, convert temperature signals into thermoelectric potential signals, and transmit them to display instruments or control systems for temperature monitoring and control. With high precision, wide range, high temperature resistance and corrosion resistance, it adapts to temperature detection scenarios of various industrial heating equipment, furnaces, pipelines and reaction devices, widely used in metallurgy, chemical industry, electric power, heat treatment and other industries.

Core Product Advantages
1. Wide Range Adaptation & Strong High Temperature Resistance: Supports wide temperature range measurement from 0~1800ºC, with various(S/B/K/N/E/J/T) optional, adapting to various working conditions from low to ultra-high temperature.
2. Accurate and Stable Measurement: Adopts imported alloy wire with stable thermoelectric characteristics, no temperature drift during long-term use, and measurement accuracy up to ±0.5ºC or ±0.4%t.
3. Diverse Structures & Flexible Installation: Provides multiple structures such as armored, assembled, and probe types, supporting various installation methods like thread, flange, and ferrule to meet different equipment installation requirements.
4. Strong Environmental Adaptability: Customizable with different protection sleeve materials (304/316L stainless steel, corundum, silicon carbide), with waterproof, anti-corrosion and anti-oxidation capabilities, suitable for harsh environments such as acid-base and high-temperature oxidation.
5. Fast Response Speed: Armored thermocouples can achieve millisecond-level response, quickly capturing temperature changes to meet dynamic temperature monitoring needs.
6. Safe and Reliable with Long Service Life: Insulating layer made of high-temperature resistant material with high insulation resistance and anti-electromagnetic interference; special alloy materials can work stably for a long time with low maintenance cost.
 

 

 

Core Composition
A Type K thermocouple consists of two conductors (thermoelectrodes) with different compositions:

 

• Positive electrode (KP): Nickel-chromium alloy (containing 80% nickel and 20% chromium), which has good oxidation resistance and electrical conductivity.
• Negative electrode (KN): Nickel-silicon alloy (containing 95% nickel and 5% silicon, and actually a small amount of manganese, cobalt, etc.), which plays a role in compensating and stabilizing thermoelectric properties.

 

 

 

Working Principle
It is based on the Seebeck effect (thermoelectric effect): When there is a temperature difference between the hot junction and the cold junction, the difference in free electron density between the two metal conductors causes directional movement of electrons, generating a thermoelectric potential (millivolt-level voltage) in the circuit.

 

• The magnitude of the thermoelectric potential has a certain functional relationship with the temperature difference between the two ends (non-linear, but can be linearized by instruments within the industrial measurement range).
• During measurement, the thermoelectric potential is detected by the instrument, and combined with cold junction temperature compensation (usually automatically completed by the instrument), the actual temperature of the hot junction can be calculated.

 

 

 

Technical features

 

 

 

•  Key Technical Parameters
• Accuracy class:
  • Class 1: Within the range of -40ºC~1000ºC, the allowable error is ±1.5ºC or ±0.4% t (where t is the measured temperature, whichever has the larger absolute value);
  • Class 2: Within the range of -40ºC~1200ºC, the allowable error is ±2.5ºC or ±0.75% t.
• Insulation resistance: At an ambient temperature of 15~35ºC and relative humidity ≤80%, the insulation resistance is ≥5MΩ (test voltage: 100V DC).
• Response time: Depends on the material and structure of the protective sleeve. For an exposed measuring tip, it is approximately 0.1~1 second; with a metal sleeve, about 1~5 seconds; and with a ceramic sleeve, around 5~30 seconds.
• Nominal pressure: The static external pressure that the protective sleeve can withstand (related to material and temperature). Metal sleeves typically range from 1~30MPa, while ceramic sleeves have a lower range (approximately 0.1~1MPa).

 

 

 Usage Precautions

 

• Environmental adaptation: Avoid direct use in reducing or sulfur-containing atmospheres; select corrosion-resistant protective sleeves (such as 316 stainless steel or corundum).
• Cold junction compensation: Since changes in cold junction temperature can affect measurement accuracy, use the instrument's built-in cold junction compensation circuit (e.g., Pt100 thermistor compensation) to eliminate errors.
• Insertion depth: The depth at which the measuring end is inserted into the measured medium should be at least 8-10 times the outer diameter of the protective sleeve to ensure sufficient contact with the measured object.
• Wiring specifications: The positive and negative electrodes must be connected correctly (usually the positive electrode is marked red, and the negative electrode is marked green or black) to avoid short circuits or poor contact.

Application Scenarios
1.Metallurgy Industry: Temperature monitoring in blast furnaces, converters, heating furnaces and heat treatment furnaces, temperature measurement of molten steel and molten iron.
2.Chemical Industry: Temperature detection of media in reactors, distillation towers and pipelines, temperature monitoring of high-temperature and high-pressure working conditions.
3.Electric Power Energy: Temperature monitoring of boiler furnaces, steam pipelines and steam turbines, temperature protection of power generation equipment.
4.Heat Treatment Industry: Temperature control of quenching furnaces, annealing furnaces and tempering furnaces, temperature monitoring during metal processing.
5.Ceramic/Glass Industry: High-temperature temperature measurement of kilns and sintering furnaces, temperature detection of molten glass.
6.Food/Pharmaceutical Industry: Temperature monitoring of sterilization equipment, ovens and reaction tanks, temperature measurement in hygienic working conditions.
7.Scientific Research Laboratories: Temperature calibration and monitoring of high-temperature experimental furnaces and test equipment.

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Company Profile

 

Address: Huji Industrial Park, Deshang Expressway, Mudan District, Heze City, Shandong Province, China
Business type: Manufacturer/factory, trading company
Business scope: manufacturing and processing machinery
Management system certification: ISO9001:2015 ISO45001:2018 ISO14001:2015
Main products: Ground flare, Biogas flares, flare stack,
Thermal Oxidation Furnace, Flue gas purification equipment

Heze Zexuan Equipment Manufacturing Co., Ltd. is an enterprise engaged in the manufacture of special equipment for environmental protection; sales of special equipment for environmental protection; application of industrial automation technology; sales of power electronic components; research and development of mechanical equipment; sales of intelligent instruments and meters; manufacturing of intelligent instruments and meters; research and development and promotion of comprehensive utilization of waste gas and VOCs treatment technology.
The company's main products and service directions: manufacturing of ground torches, elevated torches, waste gas venting torches, biogas torches, three waste incinerators, and wastewater treatment equipment, industrial automation and DCS system applications, wastewater treatment projects, VOCs treatment equipment and engineering construction, petrochemical accessories and instrument sales, petrochemical equipment installation, maintenance and repair, etc.; support product customization services and OEM services in the same industry, from design to manufacturing, installation, commissioning, and after-sales one-stop service.

 

Certifications

 

 

 

 

 

 

 

 

Frequently asked questions

Q: What is the temperature range?

A: -200~1200ºC continuous, up to 1300ºC short-term.

Q: What is the accuracy class?

A: Class 1: ±1.5ºC/±0.4%t; Class 2: ±2.5ºC/±0.75%t.

Q: Can it be used in reducing atmospheres?

A: No, use with protective sleeve (316SS/corundum).

Q: Why cold junction compensation?

A: To eliminate cold junction temperature errors.

Q: What insertion depth is required?

A: ≥8-10 times the sleeve outer diameter.

Q: How to wire correctly?

A: Red = positive, green/black = negative.

Q: What is the response time?

A: Bare tip: 0.1-1s; metal sleeve: 1-5s; ceramic sleeve: 5-30s.

Q: How to choose a protective sleeve?

A: 316SS for low-medium temps; corundum for high temps.

Q: Effect of long-term high temperature?

A: Increased drift and reduced accuracy due to grain coarsening.

Q: Calibration frequency?

A: Every 6-12 months for industrial use.


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