High Temperature Thermocouples

-- Steady & Reliable Manufacturer --

Brief Description

High Temperature Thermocouples are specialized sensors designed to accurately measure process temperatures exceeding 600∘C, utilizing the Seebeck effect to generate a voltage signal directly proportional to the temperature difference.

In-depth Overview

These devices are primarily constructed using noble metal elements (like Type R, S, or B) or refractory metals (like Type C or K) and protected by high-purity ceramic or metallic sheaths (e.g., Inconel or Tantalum). The choice of thermocouple type and sheath material determines the maximum operational temperature, which can safely exceed 1700∘C. They are preferred over RTDs in extremely hot environments due to their robustness at high heat and their fast response time, making them indispensable for high-energy processes.

Specification

Parameter	Details
Thermocouple Types	Type K, J, T, N (Base Metal); R, S, B (Noble Metal)
Max Temperature	Up to 1700∘C (Type B)
Sheath Material	Ceramic (Alumina), Inconel 600, Stainless Steel 310
Accuracy Class	Class 1 or 2 (IEC 584)
Configuration	Grounded or Ungrounded Junction
Process Connection	Fixed Flange, Adjustable Flange, Threaded
Lead Wire/Extension Cable	Special compensating cable required
Protection Head	Heavy Duty Terminal Head (explosion-proof optional)

Applications

Smelting and Metal Processing: Monitoring molten metal temperatures and furnace linings.
Cement and Glass Kilns: Measuring extremely high internal temperatures in rotary kilns.
Power Generation (Boilers): Monitoring steam and flue gas temperatures in utility boilers.
Heat Treating Furnaces: Precise control of annealing and quenching processes under extreme heat.

Key Advantages

Extreme Temperature Range: Capable of operating reliably far beyond the limits of RTDs or conventional sensors.
Fast Response Time: Direct measurement at the hot junction provides rapid temperature updates.
Relatively Low Cost: Base metal types (K, J) offer an economical choice for high-temperature measurement.
Robust Construction: Ceramic protection tubes provide exceptional thermal and mechanical resistance.

Payment and Shipping

We accept major international payment methods including T/T (Wire Transfer) and L/C. Due to the high-purity materials (e.g., Platinum/Rhodium) and custom sheath lengths often required, noble metal thermocouples have a longer lead time, typically 4-6 weeks. We use specialized packaging with secure internal supports to prevent breakage of the ceramic protection tubes during global freight.

Frequently Asked Questions

Q: What is Cold Junction Compensation (CJC)?
A: Thermocouples measure the temperature difference between the measuring junction (hot end) and the reference junction (cold end, usually at the terminal head). CJC is a necessary function (usually performed by a transmitter or controller) that measures the reference junction temperature and corrects the output to provide an accurate reading of the hot end temperature relative to 0∘C.

Q: Why is the correct sheath material important?
A: The sheath protects the elements from contamination and chemical attack at high temperatures. Incorrect material selection can lead to embrittlement, element drift, or rapid failure. For example, Inconel is great for oxidation resistance, while ceramic is necessary for extremely high heat.

Q: Can I use standard copper wire to extend the cable?
A: No. You must use the specific compensating or extension cable matched to the thermocouple type (e.g., KX for Type K). Using standard copper wire will introduce errors due to the Seebeck effect at the connection points.

Message Feedback

High Temperature Thermocouples Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.