Description
Otis elevator light curtain door sensor EG3811202TX EG3811202RX DAA24591H5 Brief Introduction
1. Full Supply Chain For Otis, Kone, Schindler, Mitsubishi, Thyssenkrupp Elevator Lift and Escalator All Brand Spare Parts
2. 100% Original New with a one-year free Guarantee.
3. Fast Delivery
4. Huge Customer From European
| Product Name: | Otis elevator light curtain door sensor |
| Model Number: | EG3811202TX EG3811202RX DAA24591H5 |
| Brand: | Otis |
| Feature: | 100% Original New |
| Guarantee: | One-Year Free Guarantee |
| Delivery Time: | 3-5working days once get the payment |
Elevator Light Curtain EG3811202TX – The 38-Beam Invisible Safety Wall That Never Blinks
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Courtesy of Nanjing Zhuye Elevator Parts Co., Ltd.
Passengers step into an elevator without thinking about the invisible barrier that keeps the doors from closing on their luggage, children or pets. That barrier is the EG3811202TX light curtain — a 38-beam, 1,200 mm high infrared safety system that scans the doorway 200 times per second and signals the controller to re-open or slow-down the instant any object — solid or transparent — is detected. Nanjing Zhuye Elevator Parts keeps factory-sealed EG3811202TX sets in anti-static stock for next-day despatch. Below we explain what the curtain does, how to mount and align it in under ten minutes, and the replacement cycle that prevents expensive “door strike” call-backs.
1. What EG3811202TX Really Is
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38 infrared diodes across 1,200 mm active height, 32 mm beam spacing
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38 receiver phototransistors with automatic gain control (AGC) for dust compensation
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Supply: 24 VDC ±10 %, 45 mA standby, 80 mA during scan
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Response time <15 ms (beam blocked to relay open)
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Output: 2 × normally-open safety relays, 2 A 250 VAC, gold-plated contacts
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IP54 front plate, -25 °C to +70 °C operating range, 95 % RH non-condensing
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Plug-in connectors (6-way Molex) for fast swap without re-wiring
If even one beam is interrupted, the NO contacts open and the controller immediately stops or re-opens the doors.
2. Where It Is Used
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Otis, Mitsubishi, Thyssen, KONE passenger elevators 800–1,100 mm clear opening
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Machine-room-less (MRL) or machine-room (MR) installations
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New build or modernisation — one part number fits all door mechanics
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Suitable for glass, stainless or painted steel door panels up to 120 kg per leaf
3. Installation – 10-Minute Alignment
Safety: place lift on inspection, lock main breaker, tag out.
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Remove old curtain — undo two M4 screws per end; unplug 6-way Molex connector.
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Clean header surface — remove dust, oil residue and metal swarf; check rail straightness <1 mm.
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Mount new set — slide EG3811202TX into existing 20 × 5 mm T-slot; torque screws 1.2 N·m.
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Connect plug — brown +24 V, blue 0 V, white/red NO contacts to door controller; earth shield at car top only.
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Power on — green LED flashes fast for 2 s while AGC calibrates, then steady green = all 38 beams OK.
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Beam test — pass a 5 mm dowel across the opening; relay must open within 15 ms and close immediately when removed.
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Final check — run door on inspection; curtain must allow close to within 50 mm then re-open on dowel intrusion.
No oscilloscope or laptop is required — EG3811202TX self-calibrates on power-up.
4. Daily Operation – What the Curtain Actually Does
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Scans 38 beams every 5 ms; AGC compensates for 30 % dust degradation
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LED intensity drops to 70 % at end-of-life (≈ 50,000 h), then yellow LED warns
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Built-in test pulse every 24 h — if three consecutive pulses fail, relay opens and “Curtain Fault” is logged
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IP54 gasket resists car-wash water jets; UV-stabilised polycarbonate prevents yellowing
5. Replacement Cycle & Preventive Maintenance
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High-traffic office (>1,500 door cycles day⁻¹) – wipe lenses every 3 months, replace curtain every 5 years
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Residential tower (400–800 cycles day⁻¹) – clean every 6 months, replace every 8 years
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Low-rise freight (≤200 cycles day⁻¹) – inspect annually, replace every 10 years
Replace immediately if:
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Yellow LED remains on after cleaning
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Response time >30 ms (tested with 5 mm rod)
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Relay contacts >100 mΩ at 1 A
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Lens cracked or beam count <35 (built-in diagnostic)
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Water ingress (fog inside lens)
6. Extending Life – 3 Pro Tips
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Keep lens face vertical; horizontal mounting collects dust 3× faster
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Clean with 70 % isopropyl, not ammonia glass spray — prevents crazing
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Check header alignment every 6 months; 2 mm offset reduces beam power by 40 %
7. Why Buy EG3811202TX from Nanjing Zhuye Elevator Parts?
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Factory-new, not refurbished; passes 4-hour burn-in at 60 °C and 1,000-cycle beam test
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Pre-calibrated; matches original beam map, no re-alignment required
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Anti-static foam box + silica gel — safe for air freight
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Dual stock: 550 pairs Nanjing, 180 pairs Dubai — next-day delivery to 65 countries
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Bundle kit: curtain + 3 m flying lead + cleaning wipe — 5 % discount
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24 months warranty against lens cracking or relay failure
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7×24 WhatsApp/WeChat video support; average response 10 minutes
Conclusion
The EG3811202TX light curtain is the invisible safety wall that passengers trust but never see. A single blocked beam can cause door strikes, callbacks and one-star reviews. Stock a spare set from Nanjing Zhuye on every service truck, swap it on schedule, and replace “door strike” panic with a five-minute planned fix — one safe, silent entrance at a time.
