OMRON E3T-ST23M Photoelectric Sensor

انهيار رمز النموذج (E3T-ST23M with 2M Cable)

Split components sold as a complete set: Emitter E3T-ST23-L, Receiver E3T-ST23-D

1. Core Basic Specifications
2. Optical Performance

Sensing method: Through-beam opposed type (paired emitter + receiver)

Rated sensing distance: 300 مم

Light source: 650 nm visible red LED

Minimum detectable object: φ2 mm opaque solid object

Beam angle: Transmitting 2°~20°, Receiving 2°~70°

وقت الاستجابة: 1 آنسة

Indicators: Orange operation indicator, green stability margin indicator

2. كهربائي تحديد

جهد الإمداد: 12~24 V DC ±10%, peak-to-peak ripple ≤10%

Current consumption: Emitter ≤10 mA, Receiver ≤20 mA

نوع الإخراج: PNP open collector

وضع التشغيل: ضوء على (output turns ON when light is received)

Load rating: الأعلى. 50 أماه, load voltage ≤26.4 V DC

Residual voltage: ≤2 V for 10~50 mA load; ≤1 V for load below 10 أماه

وظائف الحماية: عكس حماية القطبية, output short-circuit protection, mutual interference suppression

3. ميكانيكية & المواصفات البيئية

تصاعد: Fixed with M3 screws (mounting screws not included, ليتم شراؤها بشكل منفصل)

Ingress protection class: IP67

Housing material: PBT engineering plastic

Cable outlet: 2 m 4-core straight cable

Weight per set: تقريبا. 20 ز

درجة حرارة التشغيل: -25 ℃ ~ +55 درجه مئوية (لا التكثيف)

الشهادات: م, بنفايات, أول

ثالثا. Wiring Definition (4-core cable, receiver side)

1. بني: DC12~24 V positive (+)
2. أزرق: 0 V negative (أرض)
3. أسود: PNP signal output (connect load positive to black wire, load negative to 0 V)
4. أبيض: غير مستخدمة (empty pin)

The emitter only has 2 الأسلاك: بني (+), أزرق (أرض), without signal output wire.

1. Output Logic Description
2. ضوء على (هذا النموذج)

No obstruction, light path unblocked → Output ON (high level on black wire)

Object blocks light path → Output OFF

2. Cross-series reference: E3T-ST24M is PNP Dark-ON with identical 300 مسافة الاستشعار ملم
3. سيناريوهات التطبيق النموذجية
4. Presence detection & counting of materials on small production lines
5. Transmittance detection for terminals, tiny parts and thin materials (minimum φ2 mm detectable)
6. Installation in narrow equipment spaces (ultra-thin compact body)
7. التعبئة والتغليف, 3C automation, lithium battery equipment, small conveyor lines
8. Position limit detection, blanking presence detection
9. Alternative Selection Reference within the Same Series

سابعا. تثبيت & احتياطات العملية

1. Emitter and receiver lenses must be coaxial aligned; misalignment will drastically reduce sensing margin
2. Sensing margin curve: Only 2× margin at 300 مم; higher margin at short distances
3. When multiple units are mounted side by side, stagger installation to avoid mutual interference
4. Prohibit long-term oil stain and dust accumulation on lenses; clean lenses regularly
5. Do not over-tighten M3 mounting screws to prevent housing cracking
6. Load current shall not exceed 50 أماه; direct driving of high-power solenoid valves is forbidden

OMRON E3T-ST23M Detection Accuracy / Minimum Detectable Object Specifications

1. Minimum Detectable Object (Core Accuracy Index)

Official specification: φ2 mm opaque solid object

Under standard light path at rated 300 مسافة الاستشعار ملم, opaque objects with diameter ≥2 mm can trigger the sensor stably.

Theoretical occlusion ratio: 2 mm blocks the beam, corresponding accuracy of approx. 0.67% relative to effective beam diameter

2. Beam Spot Size (Affects Fine Detection Accuracy)

Transmitting divergence angle: 2°~20°, spot diameter approx. 6~8 mm at 300 مسافة الاستشعار ملم

Light intensity peaks at the spot center with reduced edge sensitivity; tiny workpieces smaller than 2 mm will be missed

3. Repeat Positioning Accuracy (Switch Repeat Error)

وقت الاستجابة 1 ms with zero mechanical clearance inside the photoelectric sensor; electrical repeatability:

Trigger repeat error ＜0.01 mm (stable static detection)

Under high-speed dynamic conveying conditions, accuracy is determined by conveying speed; no inherent lag error from the sensor itself

4. Edge Fine Detection Explanation
5. Only suitable for presence detection, counting and position limit control, not for high-precision dimensional measurement;
6. This model lacks sufficient accuracy for detecting tiny 0.5~1 mm parts; select E3T-SL series narrow-beam through-beam or fiber optic sensors instead;
7. Thin transparent films and semi-transparent materials: ال 2 mm standard does not apply, unstable detection will occur for light-transmitting workpieces.
8. Accuracy Limitations in Application

Misalignment error: Offset over 1 mm between emitter and receiver enlarges effective detectable diameter and degrades accuracy;

Dust and lens dirt equivalently expand the spot size, increasing minimum detectable dimension and worsening accuracy;

300 mm maximum sensing distance is the extreme operating condition; shorter distances (50~150 mm) deliver smaller spot size and better practical accuracy, enabling stable detection of workpieces close to 1.5 مم.

Nominal minimum detection accuracy: 2 mm opaque object (معيار 300 mm distance)

Accuracy can be improved to approx. 1.5 mm with short-distance mounting;

Not applicable for micron-level dimensional measurement; only for workpiece presence detection.

Full Sensing Distance Specifications of OMRON E3T-ST23M

1. Rated Standard Sensing Distance (Official Nominal Value)

300 مم (0.3 م)

It belongs to short-range through-beam type in E3T-ST2 series; digit “2” in model code represents 300 mm specification.

2. Valid Operating Range

Minimum installable distance: 5 مم (emitter and receiver cannot be tightly attached to avoid light path saturation)

Standard rated distance: 300 مم (optimal design installation distance with green stability indicator steadily lit)

Maximum detectable limit: Light margin decays rapidly beyond 300 مم; installation over 400 mm is highly susceptible to interference from dust, misalignment and vibration, long-term use is not recommended

Curve Description:

Only approx. 2× stability margin at 300 مم, just meeting the lower limit of stable detection;

Sufficient margin within 0~200 mm short range, delivering stronger anti-interference and anti-offset performance.

3. Sensing Distance Classification for Same-Series Through-Beam Models (Quick Selection Reference)

4. Distance Application Notes
5. 300 mm is the rated maximum limit; prioritize installation at 50~200 mm on-site for drastically improved detection stability;
6. Shorten installation distance for scenarios with multiple side-by-side sensors, heavy dust environment or severe equipment vibration;
7. Installation beyond 300 mm causes missed detection of tiny φ2 mm workpieces and increases the minimum detectable dimension.

Temperature Specifications of OMRON E3T-ST23M (Official Datasheet)

1. درجة حرارة التشغيل (Powered Running)

-25 ℃ ~ +55 درجه مئوية

Constraints: Environment free of icing and condensation; frost or condensation will cause lens light path failure and internal circuit short-circuit damage.

2. تخزين / Transportation Temperature (إيقاف التشغيل)

-40 ℃ ~ +70 درجه مئوية

Storage under icing or condensation environments is also prohibited.

Supporting Humidity Reference

Operating humidity: 35%~85% RH (لا التكثيف)

Storage humidity: 35%~95% رطوبة نسبية (لا التكثيف)

On-Site Usage Notes

1. For high-temperature operating conditions (>50 درجه مئوية), shorten sensing distance and reduce load current to avoid thermal drift of the sensor;
2. Under low-temperature conditions (<-20 درجه مئوية), avoid rapid cold-hot alternation of equipment to prevent lens frosting;
3. Long-term use of this model is not recommended near heating furnaces and ovens with high ambient temperatures; dedicated high-temperature resistant photoelectric sensors shall be adopted instead.

Translation Standard Note

All terminology follows Omron global official datasheet industrial English standards, unified international photoelectric sensor industry vocabulary, consistent with European & American automation equipment documentation writing norms.