Product Overview
The DSFA Laser Fiber Optic Sensor with Built-in Amplifier is designed for applications where conventional photoelectric sensors are difficult to install or where precise detection of small objects is required.
The fiber probe allows the sensing point to be installed directly at the required detection location, while the built-in amplifier eliminates the need for a separate external fiber amplifier.
The laser-based sensing system produces a small, concentrated light spot, making the sensor suitable for detecting small components, parts, edges, presence/absence and positioning conditions.
Available Models
| Model | Probe Size | Supply | Light Source | Sensing Distance | Output |
| DSFA-M3-24L-P80 | M3 | 24 VDC | Laser 655 nm | 80 mm | PNP |
| DSFA-M4-24L-P100 | M4 | 24 VDC | Laser 655 nm | 100 mm | PNP |
NPN versions can be configured using the corresponding NPN model suffix where offered.
Special Features
Built-in Amplifier
The amplifier is integrated into the sensor assembly, eliminating the requirement for a separate fiber amplifier unit and simplifying installation.
655 nm Red Laser
The DSFA Series uses a 655 nm laser light source, providing a concentrated sensing beam suitable for precision detection.
Small Light Spot
The reference specification indicates an approximately Ø1 mm spot, helping the sensor detect small objects and specific portions of a workpiece.
Threaded Fiber Probe
The probe is available in compact threaded configurations including M3, M4, M5 and M6, allowing integration into machine fixtures and restricted spaces.
24 VDC Industrial Operation
The requested DSFA models are designed for 24 VDC industrial control systems, allowing easy integration with PLC and automation equipment.
Light-ON / Dark-ON Selection
The output mode can be selected between Light-ON and Dark-ON, providing flexibility for different detection applications.
Key Features
- Laser fiber optic sensor with built-in amplifier
- 655 nm red laser source
- Diffuse-reflective sensing
- M3 / M4 / M5 / M6 probe options
- Straight as well as angled type probe
- Compact threaded sensing head
- 80 mm / 100 mm / 150 mm sensing-distance options
- Approximately Ø1 mm laser spot
- 5 ms response time
- Light-ON / Dark-ON selectable
- PNP / NPN output options
- 24 VDC industrial operation
- Reverse-polarity protection
- Output short-circuit protection
- Surge absorption protection
- IP66 protection
- 2 m standard lead wire
- Suitable for small-object detection
Model Structure
Example: DSFA-M4-24L-P100
| Code | Description |
| DSFA | Denki Seigyo Laser Fiber Optic Sensor with Built-in Amplifier |
| M4 | M4 Fiber Probe |
| 24 | 24 VDC |
| L/S | Angled/Standard |
| P | PNP Output |
| 100 | 100 mm Sensing Distance |
Technical Specifications
Optical Specifications
| Parameter | Specification |
| Sensor Type | Laser Fiber Optic Sensor with Built-in Amplifier |
| Probe Type | Diffuse Angled, Straight Head |
| Probe Size | M3 / M4 / M5 / M6 |
| Light Source | Laser |
| Wavelength | 655 nm |
| Detection Object | Opaque objects ≥ Ø1.5 mm |
| Detection Distance | 80 / 100 / 150 mm, depending on model |
| Spot Size | Approx. Ø1 mm |
| Sensing Method | Diffuse Reflective |
| Hysteresis | Less than 10% of detection distance |
| Repeat Accuracy | Less than 3% of detection distance |
| Response Time | 5 ms |
| Output Selection | Light-ON / Dark-ON |
Electrical Specifications
| Parameter | Specification |
| Power Supply | 24 VDC |
| Supply Range | 12–24 VDC ±10% |
| Output Options | PNP / NPN |
| PNP Output | PNP (+V), Max. Output <100 mA |
| NPN Output | NPN (0V), Max. Output <100 mA |
| Current Consumption | ≤60 mA |
| Residual Voltage | ≤2 V |
| Output Function | Light-ON / Dark-ON |
| Reverse Polarity Protection | Yes |
| Output Short-Circuit Protection | Yes |
| Surge Absorption Protection | Yes |
Environmental Specifications
| Parameter | Specification |
| Operating Ambient Brightness | Incandescent lamp: max. 20,000 lux |
| Sunlight | Max. 30,000 lux |
| Operating Temperature | -25°C to +70°C |
| Operating Humidity | 35–95% RH, non-condensing |
| Protection Rating | IP66 |
| Vibration Resistance | 10–55 Hz, double amplitude 1.5 mm, 2 hours each X/Y/Z axis |
| Shock Resistance | 500 m/s², 2 tests each X/Y/Z axis |
Construction & Connection
| Parameter | Specification |
| Housing Material | PBT-ABS |
| Probe Type | Straight Head/Angled Head |
| Probe Thread Options | M3 / M4 / M5 / M6 |
| Connection Method | Standard Lead Wire |
| Cable Length | 2 m |
| Protection | IP66 |
Standards
| Standard / Certification | Specification |
| Protection | IP66 |
| EMC | EU CE-EMC |
| Environmental Compliance | RoHS 2.0 |
Available Models
| Model | Probe | Supply | Output | Sensing Distance |
| DSFA-M3-24L-P80 | M3 | 24 VDC | PNP | 80 mm |
| DSFA-M4-24L-P100 | M4 | 24 VDC | PNP | 100 mm |
Optional Configuration
| Probe | Possible Sensing Distance |
| M3 | 80 mm / application dependent |
| M4 | 100 mm / application dependent |
| M5 | Optional |
| M6 | Optional |
PNP and NPN Output
The DSFA Series can be offered in both PNP and NPN output configurations, allowing compatibility with different PLC input architectures.
PNP Version
The PNP sensor provides a positive switching output and is suitable for control systems using sourcing-type sensor inputs.
Example:
DSFA-M4-24L-P100
NPN Version
The NPN sensor provides a 0 V switching output and is suitable for control systems using sinking-type sensor inputs.
Example model structure:
DSFA-M4-24L-N100
Applications
The DSFA Series is suitable for precision object detection in:
- Small-part detection
- Component presence detection
- Part counting
- Position detection
- Edge detection
- Assembly automation
- Packaging machinery
- Pick-and-place systems
- Conveyor systems
- CNC machines
- Automatic inspection equipment
- Robotics
- Electronic component manufacturing
- Automotive component assembly
- Pharmaceutical machinery
- Semiconductor-related automation
Why Choose Denki Seigyo DSFA Series?
Built-in Amplifier
No separate external amplifier is required, simplifying the overall sensor installation.
Laser Precision
The 655 nm laser source and approximately 1 mm spot provide focused detection for small targets.
Compact Probe
M3/M4/M5/M6 threaded probes allow installation in confined machine spaces.
Flexible Output
PNP and NPN configurations provide compatibility with different PLC input systems.
Easy Configuration
Light-ON and Dark-ON selection allows the sensor to be adapted to different detection conditions.
Industrial Protection
IP66 construction and a -25°C to +70°C operating range make the sensor suitable for industrial automation environments.
Frequently Asked Questions
What is DSFA?
DSFA is the Denki Seigyo Laser Fiber Optic Sensor Series with a built-in amplifier.
What type of light source does the DSFA use?
The DSFA Series uses a 655 nm laser light source.
What is the sensing method?
The reference configuration uses diffuse-reflective sensing.
What is the sensing distance of DSFA-M3-24L-P80?
The DSFA-M3-24L-P80 has an 80 mm sensing distance.
What is the sensing distance of DSFA-M4-24L-P100?
The DSFA-M4-24L-P100 has a 100 mm sensing distance.
What does M3 or M4 mean?
M3 and M4 identify the thread/probe size of the fiber sensing head.
Does DSFA support PNP and NPN?
Yes. The DSFA platform is designed for PNP and NPN output configurations.
What is the power supply?
The requested models are designed for 24 VDC industrial operation. The reference specification gives an allowable supply range of 12–24 VDC ±10%.
What is the response time?
The reference specification specifies a 5 ms response time.
What is the minimum detectable object?
The reference specification states detection of opaque objects ≥ Ø1.5 mm.
What is the protection rating?
The reference specification specifies IP66.
What is the cable length?
The standard connection is a 2 m lead wire.
Product Summary
The Denki Seigyo DSFA Series Laser Fiber Optic Sensor with Built-in Amplifier provides compact and precise object detection using a 655 nm laser source and diffuse-reflective fiber probe.
With M3/M4/M5/M6 probe options, PNP/NPN outputs, 24 VDC operation, 80/100/150 mm sensing-distance options, approximately 1 mm spot size and IP66 protection, the DSFA Series is designed for reliable integration into industrial automation and precision detection systems.
