Keyence FU-31 Fiber Optic Sensor - Image 2

Keyence FU-31 Fiber Optic Sensor - Image 3

Keyence FU-31 Fiber Optic Sensor - Image 4

Keyence FU-31 Fiber Optic Sensor

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Category: Keyence

Keyence FU-31 Side – Emitting Reflective Fiber Optic Sensor Unit

Product Overview

The Keyence FU-31 is a space – saving side – emitting reflective fiber optic sensor unit, engineered to work seamlessly with Keyence fiber optic amplifiers (like FS – V31P, FS – N41P) for non – contact, high – precision detection in the industrial automation sector. It is particularly well – suited for applications where space is limited, such as detecting tiny electronic components (like gold wires with a diameter of 0.005 mm), inspecting small mechanical parts, and carrying out quality control checks on compact assembly linesKEYENCE INTERNATIONAL (BELGIUM) NV/SA. This sensor unit has a dual – core fiber design and a side – emitting beam direction, which enables installation in tight spaces that are inaccessible to conventional straight – emitting sensors. The 2 – meter free – cut fiber cable allows for flexible customization to fit specific installation needs, and its durable construction ensures stable performance in harsh industrial environments with extreme temperatures. It offers an ideal solution for enhancing detection accuracy and flexibility in scenarios where traditional sensors struggle to be installed or perform reliablyKEYENCE INTERNATIONAL (BELGIUM) NV/SA.

Main Functions

High – Precision Micro – Object Detection

It can detect ultra – small objects, with the minimum detectable object being a 0.005 mm diameter gold wire when the detection distance and sensitivity are set to their optimal states. This makes it highly suitable for precision tasks like semiconductor lead frame inspection and fine wire bonding detection in the electronics manufacturing industryKEYENCE INTERNATIONAL (BELGIUM) NV/SA.
Space – Saving Side – Emitting Detection

The side – emitting beam direction allows the sensor to be mounted in narrow gaps, around machine components, or on the sides of small fixtures. It is perfect for applications where the detection position is constrained by the mechanical layout of the equipment, such as in the internal detection of small – size electronic devices.
Flexible Installation and Customization

The 2 – meter fiber cable is free – cut, enabling users to adjust the cable length according to the actual installation distance, thus reducing cable clutter and optimizing the sensor layout. The dual – core fiber (ø1.0 mm × 2) ensures efficient light transmission, and the minimum bend radius of R10 mm provides more installation flexibility compared to other fiber sensors with larger bend radius requirementsKEYENCE INTERNATIONAL (BELGIUM) NV/SA.
Harsh Environment Adaptability and Amplifier Compatibility

It can operate stably within a wide temperature range of – 40°C to + 70°C, making it applicable in high – temperature production processes, cold storage facilities, and outdoor industrial settings. It is fully compatible with Keyence fiber optic amplifiers, which can convert light intensity changes into digital signals for seamless integration with PLCs, HMIs, and other control systems, ensuring reliable signal transmission and processingKEYENCE INTERNATIONAL (BELGIUM) NV/SA.
Mutual Interference Suppression

When used in combination with compatible Keyence amplifiers, it can effectively suppress mutual interference when multiple sensors are installed in close proximity. This maintains signal integrity in high – density detection setups, such as on multi – station assembly lines.

Technical Features

Feature	Details
Sensor Type	Side – emitting reflective fiber optic sensor unit
Beam Emitting Direction	Side
Fiber Configuration	Dual – core (transmission + reception), ø1.0 mm diameter × 2
Fiber Length	2 m (free – cut)
Minimum Bend Radius	R10 mm
Minimum Detectable Object	0.005 mm diameter gold wire (under optimal detection conditions)
Operating Temperature	– 40°C to + 70°C (no condensation)
Storage Temperature	– 40°C to + 85°C
Housing Material	Stainless steel (sleeve part), durable polymer (cable jacket)
Light Compatibility	Optimized for red LED light sources (640 nm wavelength, compatible with Keyence amplifiers)
Mechanical Durability	Resistant to vibration, shock, and minor chemical exposure, ensuring long – term stable operation

Product Dimensions and Weight

Item	Details
Fiber Cable Diameter	ø1.0 mm × 2 (dual – core parallel configuration)
Fiber Cable Length	2 m (free – cut)
Sleeve Length	Standard compact size for side – mounting
Weight	Approximately 5 g (including fiber cable and sensor head)
Mounting Method	Suitable for sleeve – type mounting, compatible with standard brackets and fixtures for side – position installation
Cable Connector	Pre – terminated for direct and secure connection to Keyence fiber optic amplifiers

WHO WE ARE

About us

Located in Kunshan, China, Atifts Technology Co., Ltd. is a well-known enterprise specializing in electronic components distribution. We specialize in the sales of global brands of industrial automation components, with a wealth of experience in foreign product agents, and many of the world's leading manufacturers such as Keens, Schneider, SMC, ABB, Siemens, and other world-renowned manufacturers to establish a long-term and stable relations of cooperation.

Atifts Technology Co., Ltd. @ 2024

Over the years, we have always adhered to the "pioneering, pragmatic, standardized, innovative" management philosophy, and constantly promote the close integration of products and market demand. We firmly believe that only by constantly exploring new market areas, doing a good job in every detail, standardizing business processes, and continuously innovating products and services can we ensure that our products are more adaptable to market changes and meet the diversified needs of our customers. Since the founding of the company, we have always adhered to the core concept of "survival by quality", and are committed to providing customers with high-quality electronic components. At the same time, we take specialized R & D manufacturing as the goal, market-oriented development strategy to ensure that our products are always in the forefront of the industry.

With excellent product quality, professional technical service and good market reputation, Kunshan Autofits Technology Co.,Ltd. has won the trust and support of our customers. We look forward to working with more partners hand in hand, to achieve long-term win-win relationship, and jointly promote the prosperity of the electronic components industry.

Where is your company located?

We are located next to Shanghai, the largest city in China, and Kunshan, the first economic county in China. With convenient transportation and developed logistics, it provides a good geographical advantage for our electronic components sales business.

What types of electronic components does your company mainly sell?

We are committed to providing many types and brands of electronic components, including but not limited to Sensors, Switches & Relays, Connectors, Circuit Protectio, Power Supplier & Cable, etc. We have established relationships with many well-known electronic component manufacturers. We have established long-term and stable relationships with many well-known electronic component manufacturers to ensure that the products we sell are of reliable quality and reasonable price.

What are the prices of your products?

Our product prices vary according to market conditions and product models. We are committed to providing high quality electronic components at fair and reasonable prices, and offer our customers a variety of incentives and flexible purchasing methods.

How to purchase your electronic components?

You can contact our customer service staff directly by phone, whatsapp, email, our official website. We support a variety of payment methods, and provide you with fast and safe logistics and distribution services.

How do you guarantee the quality of your products?

We attach great importance to product quality, all the electronic components we sell come from regular channels and undergo strict quality testing. We promise to provide customers with high-quality electronic components, and provide perfect after-sales service to ensure that customers have no worries in the process of use.

If I am not satisfied with the electronic components I purchased, can I return them?

We provide perfect after-sales service, if you are not satisfied with the purchased electronic components, you can return or exchange them within the specified time. Please refer to our official website or consult our customer service staff for the specific return policy and process.

Can your company provide technical support and solutions?

We have a professional technical team that can provide technical support and solutions for our customers. Whether you encounter any problems in choosing or using the products, we will be happy to answer your questions and provide professional technical support.

How to contact your customer service?

You can contact our customer service personnel through the online customer service system on our official website, telephone, e-mail or social media platforms. Our customer service staff will provide you with professional services and answer any questions you may have.

Does your company often organize promotional activities?

In order to give back to our customers, we will organize various promotions from time to time, including discounts, full reductions, giveaways and so on. Please keep an eye on our official website or social media platforms to stay up-to-date with the latest promotions.