I. Core Parameters

Item	Details
Applicable Temperature Range	Suitable for high-temperature working conditions of carbon baking furnaces (inferred from product characteristics, core-adapted to the high-temperature environment of annular baking processes)
Protection Sleeve Material	Special high-temperature alloy (integrally drilled and formed)
Structure Type	Composite armored structure (optimal structure for base metal thermocouples under high temperature)
Explosion-Proof Rating	Ex db IICT1~T6 Gb (complies with GB/T 3836.1-2021 and GB/T 3836.2-2021 standards)
Safety Certification Level	SIL 2 functional safety level (complies with IEC 61508:2010 standard)
Service Life	Flame type: 3~9 months; Hopper anode type: 6~12 months
Adaptable Standards	Electromagnetic Compatibility (EMC) and Low Voltage (LVD) comply with 2014/30/EU and 2014/35/EU directives; EN 61000 series standards
Model Specification (Explosion-Proof Type)	WRa24b/44b-B (a = thermocouple type: K/E/J/T/N; b = protection tube diameter: 0/1)

II. Product Features

The protection sleeve is made of special high-temperature alloy through integral drilling, featuring optimal heat resistance, carbon/sulfur corrosion resistance, strong sealing performance and high-temperature strength;

Adopts a composite armored structure, which gives full play to the comprehensive performance of the core and sleeve, and is the optimal performance structure for base metal thermocouples under high temperature;

Explosion-proof design, suitable for hazardous working conditions, complying with national and international explosion-proof standards;

Meets functional safety requirements (SIL 2 level) and can be applied to safety-related systems;

High product consistency, suitable for large-scale production and bulk procurement needs.

III. Related Component Specifications

Component Name	Specification Details
Protection Sleeve	Special high-temperature alloy material, integral drilling process, optional diameter of 0 or 1 (corresponding to the "b" parameter in the model)
Thermocouple Core	Supports multiple types (K/E/J/T/N, corresponding to the "a" parameter in the model) with a composite armored structure
Installation Type	Suitable for explosion-proof installation (model WRa24b/44b-B), complying with GB/T 26786-2011 standard
Cable Entry Device	Requires users to configure clamping measures (to prevent cables from being subjected to tension or torsion, special requirement of the explosion-proof certificate)
Auxiliary Certifications	Equipped with CE, SIL 2, ISO 14001, ISO 45001 and other certification marks

IV. Application Scenarios

Core Scenario: Prebaked anode carbon baking furnace for aluminum electrolysis (annular baking technology, double-row structured furnace chamber, mobile firing system);

Adaptable Industries: Aluminum electrolysis industry, carbon product manufacturing industry;

Specific Working Conditions: Roasting of formed carbon raw products, temperature monitoring under high-temperature inert/complex atmospheres;

Cooperative Customer Adaptation: Industrial enterprises such as BYD, Aviation Industry Corporation of China, Aero Engine Corporation of China, China Minmetals, and NAURA Technology, as well as scientific research institutions (e.g., Tsinghua University, National University of Defense Technology).

V. Product Advantages

Material Advantage: Special high-temperature alloy sleeve, corrosion-resistant, high-temperature resistant, anti-brittle, suitable for harsh roasting environments;

Structural Advantage: Composite armored design, stable performance under high temperature, far exceeding the comprehensive performance of ordinary thermocouples;

Cost-Effectiveness Advantage: Leading cost-performance ratio in the industry, long service life (3~12 months), reducing replacement frequency and costs;

Safety Advantage: Explosion-proof + SIL 2 functional safety certification, strong compliance, suitable for hazardous working conditions;

Complete Certifications: Passed CE, ISO 14001, ISO 45001, NEPSI explosion-proof certification, etc., applicable both domestically and internationally;

Technological Precipitation: Developed based on two patented products (composite armored thermocouple and composite metal sleeve) with mature technology.

VI. Frequently Asked Questions

Q: What are the special usage requirements for the product's explosion-proof function?

A: ① Maintenance of the explosion-proof joint surface must be carried out by contacting the manufacturer; ② The cable entry device does not have built-in sufficient clamping measures, and users need to configure them independently to prevent cables from being subjected to tension or torsion.

Q: How to select different types of thermocouples (K/E/J/T/N)?

A: Select according to the actual working condition temperature range, atmospheric characteristics and supporting instrument type. You can consult the manufacturer for customized adaptation solutions.

Q: What factors affect the product's service life?

A: It is mainly affected by the working condition temperature (flame zone/hopper zone) and atmospheric corrosiveness (carbon/sulfur content). The service life of the flame type is 3~9 months, and that of the hopper anode type is 6~12 months.

Q: Does the product support international standard replacement?

A: Complies with international standards such as IEC 60584 and EN 61000, and can directly replace imported models of the same type without additional debugging.

Q: How to verify the validity of product certifications?

A: ① The explosion-proof certificate (NEPSI) can be queried through www.nepsi.org.cn; ② The CE certificate can be queried through www.udemitd.com.tr; ③ The ISO system certification can be queried through www.ucccert.com or www.cnca.gov.cn.