The HT3C/4P is a compact, high-performance diffuse reflection photoelectric sensor from Leuze Electronic. Designed with background suppression technology, it accurately detects objects within a fixed range regardless of surface color or reflectivity, making it ideal for automation and factory applications.
Operating Principle: Diffuse reflection with background suppression ensures reliable detection of objects without being affected by backgrounds.
Advanced Optics: Equipped with red LED light and a focused square-shaped beam for precise object detection.
Dual PNP Switching Outputs: One for light switching, one for dark switching, enabling flexible system integration.
Fast Response Time: Reacts in just 0.5 ms with a switching frequency of 1,000 Hz.
Wide Sensing Range: Detects objects from 5 mm to 450 mm, with adjustments via a multi-turn potentiometer.
Robust Environmental Ratings: Rated IP67 and IP69K, suitable for harsh industrial environments.
Compact Dimensions: Slim body size of just 11.4 × 34.2 × 18.3 mm makes it ideal for tight installations.
Certified Safety and Compatibility: Complies with IEC 60947-5-2 and UL standards, including ECOLAB chemical resistance.
| Parameter | Value |
|---|---|
| Operating Principle | Diffuse reflection with background suppression |
| Light Source | Red LED (633 nm), Pulsed |
| Light Spot Shape | Square |
| Focus Distance | 200 mm (fixed) |
| Adjustment Range | 15 – 450 mm |
| Operating Range (White 90%) | 5 mm – 450 mm |
| Operating Range (Gray 18%) | 10 mm – 340 mm |
| Operating Range (Black 6%) | 15 mm – 220 mm |
| Black/White Error | < 10% up to 220 mm |
| Parameter | Value |
|---|---|
| Supply Voltage (UB) | 10 – 30 V DC (incl. ripple) |
| Residual Ripple | 0 – 15% of UB |
| Open-Circuit Current | 0 – 15 mA |
| Output Type | 2x PNP Transistor |
| Switching Current (max.) | 100 mA |
| Output Voltage | High ≥ UB – 2V; Low ≤ 2V |
| Switching Functions | Light switching (OUT1), Dark switching (OUT2) |
| Readiness Delay | 300 ms |
| Response Time | 0.5 ms |
| Response Jitter | 166 µs |
| Switching Frequency | 1,000 Hz |
| Parameter | Value |
|---|---|
| Type of Connection | Cable |
| Cable Length | 2,000 mm |
| Cable Material | PUR |
| Wire Cross-Section | 0.2 mm² |
| No. of Conductors | 4-wire |
| Color Code | Brown (V+), Blue (GND), White (OUT2), Black (OUT1) |
| Parameter | Value |
|---|---|
| Dimensions (W x H x L) | 11.4 mm × 34.2 mm × 18.3 mm |
| Housing Material | PC-ABS Plastic |
| Lens Cover Material | PMMA |
| Net Weight | 50 g |
| Mounting Options | Through-hole or bracket mounting |
| Display Indicators | 2 LEDs (Green = Ready, Yellow = Object detected) |
| Adjustment Method | Multi-turn potentiometer |
| Color | Red |
| Parameter | Value |
|---|---|
| Operating Temperature | -40°C to +60°C |
| Storage Temperature | -40°C to +70°C |
| Protection Class | IP67, IP69K |
| Protection Class (Electrical) | Class III |
| Compliance Standards | IEC 60947-5-2, cULus |
| Material Compatibility | ECOLAB-certified |
Green LED: Device is powered and ready.
Yellow LED: Object detected within range.
Adjustment: 8-turn potentiometer for fine tuning the detection range.
BT 3 Mounting Bracket (Part No. 50060511)
L-shaped rigid angle bracket
Through-hole mounting system
Metal construction
BTU 200M-D12 Mounting System (Part No. 50117255)
For 12 mm rods, sheet-metal mounting
360° turning, adjustable and clampable
Screw-type fixture, M3 compatible
| Section | Description |
|---|---|
| HT3C | Diffuse reflection sensor with background suppression |
| 4 | PNP output, light switching (OUT1) |
| P | PNP output, dark switching (OUT2) |
| Cable | 4-wire, 2000 mm PUR cable (standard) |
Not suitable for personnel protection; it is not a safety sensor.
Must be installed by qualified personnel.
For UL applications: Only permitted with Class 2 circuits, and cable assemblies must be UL Listed with minimum ratings of 30V/0.5A.
Total output current must not exceed 50 mA for ambient temperatures > 40°C.
Light source lifetime is approx. 100,000 hours at 25°C.
| Issue | Likely Cause | Solution |
|---|---|---|
| No detection | Object outside of sensing range | Adjust range using potentiometer |
| False detection | Background too reflective | Use with proper background suppression |
| LEDs not lighting | Power supply issue | Verify 10–30V DC at cable input |
| Output not switching | Load exceeds current limit | Ensure max 100 mA switching current |
| Intermittent detection | Misalignment or vibration | Realign sensor and use mounting bracket |
The Leuze HT3C/4P Diffuse Sensor is a compact, intelligent sensing solution for applications that require accurate object detection while ignoring reflective or interfering backgrounds. With its high-speed response, environmental resistance, and dual output configuration, it is a reliable choice for automation systems across industries.