The HRTR 55 "S" is a high-performance optical sensor designed for precise object detection in hygienic and industrial environments. Featuring visible red light, it offers adjustable background suppression and reliable detection performance even on glossy or colored surfaces.
Visible red light with adjustable background suppression.
316L stainless steel housing in Hygiene-Design.
Enclosed optics to prevent bacterial carry-over.
Tested for chemical resistance: ECOLAB and CleanProof+ approved.
Paperless device identification and scratch-resistant front cover.
8-turn potentiometer for precise scanning range adjustment.
Excellent black/white detection and reliable switching on reflective or structured surfaces.
Homogeneous light spot (~4mm at 100mm) for detecting small parts.
Active Ambient Light Suppression (A2LS).
Push-pull switching outputs, high switching frequency (1000Hz), and fast response time (0.5ms).
IP67/IP69K protection, suited for wash-down applications.
Optical Data
Scanning Range Limit: 5–200 mm
Adjustment Range: 15–200 mm
Light Source: LED, 660nm, modulated visible red light
Light Spot Diameter: Ø ~4mm at 100mm
Scanning Range Examples:
White (90% reflectivity): up to 200 mm
Gray (18%): up to 150 mm
Black (6%): up to 120 mm
Timing
Switching Frequency: 1000Hz
Response Time: 0.5ms
Start-up Delay: ≤300ms
Electrical Data
Voltage: 10–30V DC
Residual Ripple: ≤15%
Current (no load): ≤15mA
Switching Outputs: 1 or 2 push-pull outputs (depending on model)
Output Current: Max. 100mA
Signal Voltage (High/Low): ≥ (UB – 2V) / ≤ 2V
Adjustment: 8-turn potentiometer
Indicators
Green LED: Power On
Yellow LED: Object detected
Housing Material: AISI 316L stainless steel
Design: Wash-down compatible
Optics Cover: PMMA, scratch-resistant
Cable Types:
M8 connector (4-pin)
0.2m cable with M12 connector (4-pin)
5m cable (4 x 0.20 mm²)
Weight:
M8 connector: 40g
M12 connector with cable: 60g
5m cable: 110g
Temperature Range: -30°C to +70°C (operating & storage)
Protection Circuits: Polarity reversal and short-circuit protection
Protection Class: IP67 / IP69K
Standards: IEC 60947-5-2, UL 508, EN 62471
Certification: UL, ECOLAB, CleanProof+
VDE Safety Class: III
⚠️ Not a safety sensor. Use only by competent persons according to its intended use.
Avoid perpendicular incidence on shiny surfaces; slight inclination is recommended.
Move objects laterally, not from connector/operating sides.
Multiple sensors of the same type should not face each other directly.
Functions as energetic scanner beyond scanning range for light-colored objects.
| Model | Part No. | Output | Connector | Notes |
|---|---|---|---|---|
| HRTR 55/66-S-S8 | 50107493 | 2x push-pull | M8 (4-pin) | Standard |
| HRTR 55/6-S-S8.3 | 50107494 | 1x push-pull | M8 (3-pin) | — |
| HRTR 55/66-S,200-S12 | 50107495 | 2x push-pull | 200mm cable + M12 (4-pin) | — |
| HRTR 55/66-S,5000 | 50114069 | 2x push-pull | 5m cable | — |
All models include both green and yellow LED indicators.
For UL use: Class 2 circuits only.
Cable assemblies must be UL Listed, rated 30V, 0.24A min.
Enclosure type: Type 1 for NFPA 79 applications.
Use only manufacturer-approved field wiring adapters.
Below is a list of common issues, possible causes, and recommended actions for troubleshooting the HRTR 55 "S" sensor:
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Sensor does not power on | No power supply or loose connection | Check power connections and ensure 10–30VDC is applied. Verify polarity. |
| Green LED not lit | Power not reaching sensor | Verify supply voltage and cable integrity. Check for short circuits. |
| Sensor does not detect object | Object is outside scanning range | Re-adjust object position within the adjustable range (15–200mm). |
| Yellow LED does not activate when object is present | Scanning range not set correctly or reflective surface issue | Adjust the 8-turn potentiometer. Ensure object is not too reflective; angle the sensor slightly. |
| Inconsistent detection | Ambient light interference or misalignment | Check for strong background light; reposition sensor. Verify alignment using optical axis. |
| False detections on shiny objects | Direct reflection into sensor | Tilt the sensor slightly to avoid right-angle reflections from metallic or glossy surfaces. |
| Multiple sensors interfering | Mutual interference between sensors | Avoid mounting sensors directly opposite each other. Use physical separation or optical shielding. |
| Yellow LED always on | Background suppression not set correctly | Readjust background suppression using potentiometer. Verify no high-reflectivity object in background. |
| Sensor response delayed | Excessive delay before start-up or switching | Verify sensor isn't in warm-up (≤300ms). Ensure object speed is within response time (0.5ms). |
| Sensor damaged or unresponsive | Electrical fault or mechanical damage | Inspect housing and cable. Replace unit if IP67/IP69K rating is compromised or physical damage is evident. |