op is  is a type of explosion-proof design for optical radiation equipment,(Optical Radiation Intrinsic Safety), designed to ensure that optical radiation devices (such as lasers and optical fibers) do not ignite flammable gases or dust in explosive environments.

I. Core Meaning and Principles

1. Explosion-proof type definition: Under normal operating conditions or specified fault conditions, the optical radiation energy generated by the equipment is insufficient to ignite combustible substances in a specific explosive atmosphere.

2. Applicable Wavelength Range: Primarily targets visible light and infrared radiation from 380 nm to 10 µm.

3. Safety Mechanism: By limiting the power, irradiance, or energy density of the light source, it prevents ignition caused by absorption, focusing, or thermal effects.

II. Typical Application Scenarios

1. Fiber optic temperature measurement and communication systems in industrial settings (such as distributed fiber optic sensing)

2. Areas with explosive gases or dust, such as hazardous chemical storage and transportation, petrochemicals, and coal mines

3. High-risk environments requiring non-electrical signal transmission (e.g., JTW-XCD-SF800A optical fiber temperature detectors certified with Ex op is)

III. Relevant Standards

1. Domestic Standard: GB/T 3836.22-2023 "Explosive Atmospheres - Part 22: Protection Measures for Optical Radiation Equipment and Transmission Systems"

2. International Standard: IEC 60079-28:2015 (Equivalent Adoption)

IV. Differences from Other Explosion-Proof Light Radiation Types

V. Certification Process and Agencies

The certification process typically includes:

The product design complies with the requirements of GB/T 3836.22;

2. Submit the samples to a qualified testing institution;

3. Conduct explosion-proof performance tests (including optical power limitation, fault simulation, temperature measurement, etc.);

4. Upon approval, issue the explosion-proof inspection report and explosion-proof certificate, with markings such as ‌Ex op is / op pr / op sh‌ for explosion-proof certification

5. Professional Agency: Shenzhen Zhongnuo Testing Technology Co., Ltd（STS）. We can provide guidance on explosion-proof design and rectification processes, as well as process agency services. We have successful certification cases for products such as passive optical fiber lamps, distributed optical fiber temperature measurement systems, and laser gas cameras.