Description

1. Part-number breakdown DAA24270F1 = Otis strain-gauge load sensor, 5 VDC ±5 %, 2 mV/V output, 0–2 000 kg, ±0.1 % accuracy, –10 °C…+70 °C, IP54
   Cable: shielded 4-core, 3 m PUR, 2 kV rated, colour-coded per EN 81-13
   Overload: 150 % for 60 s without zero shift, MTBF 100 kh @ 25 °C
2. Safety first—lock-out & verify Sensor sits under the car cross-head but shares 110 VDC brake circuits. Lock the main disconnect, engage the car-top inspection switch and wait 60 s for the rail to fall below 5 V. Keep the new NYE sensor in its anti-static bag until mounting—ESD can damage the strain-gauge bridge.
3. Mechanical mounting—keep it centred Body: Ø 28 mm, 60 mm length, mass 0.18 kg.
   Mount between cross-head and rope-rod using M12 thread, torque 50 N·m.
   Maintain vertical alignment ±1 °; every 1 ° tilt introduces 0.2 % error. NYE supplies a free spherical washer (NY-WASHER-F1) and 0.1 mm shim set (NY-SHIM-F1) for quick alignment.
4. Connection map (print and stick inside car-top) +5 V: red, 0.5 mm², shielded, <3 m
   0 V: black, shielded, <3 m
   Signal+ : green, 120 Ω termination at controller
   Signal– : white, 120 Ω termination
   Shield: grounded at controller end only
5. Power-up & zero calibration Apply 5 VDC; green “RUN” LED steady, output 2.000 mV ±0.002 mV @ 0 kg.
   Place empty car at mid-floor; controller must read 0 kg ±2 kg.
   If zero drift >5 kg, re-align sensor or replace immediately.
6. Full-scale calibration Place certified weights (25 %, 50 %, 100 % of rated load).
   Controller must read within ±2 kg of actual weight; linearity R² >0.999.
   If error >5 kg or R² <0.995, sensor is fatigued—replace immediately.
7. AI drift prediction (Otis GECB) On-board algorithm analyses zero drift rate and load histogram.
   Alarm threshold: 5 kg drift in 30 days, 95 % confidence.
   False-positive rate: <1 % on validated Otis sensors.
   If prediction >10 kg drift, schedule replacement.
8. Temperature & lifetime model Strain-gauge: 100 kh @ 25 °C, halves every 10 °C rise.
   Cable PUR: 40 000 h @ 70 °C, doubles every 10 °C drop.
   Translate to building traffic: Light traffic (residence, 300 trips/day) – sensor ≈ 25 years; inspect every 5 years. Medium traffic (office, 600 trips/day) – sensor ≈ 12 years; inspect every 3 years. Heavy traffic (mall/metro, 1 200 trips/day) – sensor ≈ 6 years; inspect every 2 years.
9. Preventive inspection checklist Monthly: visual RUN LED, zero reading @ empty car. Quarterly: measure output mV; drift >5 kg schedules re-calibration. Annually: megger sensor to PE >100 MΩ; <10 MΩ indicates moisture ingress. Bi-annually: torque test M12 nut; vibration loosens it, causing drift.
10. Rapid swap (downtime < 10 min) a) Place car at mid-floor, lock-out, tag out.
    b) Photograph wire numbers with phone.
    c) Remove M12 nut, slide old sensor out.
    d) Insert new NYE DAA24270F1, torque 50 N·m, set vertical ±1 °.
    e) Restore cables, power up, run zero & full-scale calibration.
    f) Log serial number and drift value; return old unit for recycling.
11. Recycling & sustainability Nanjing Zhuye offers prepaid UPS labels inside every carton.
    Returned sensors are stripped: stainless body remelted, copper coil recycled, strain-gauge processed for platinum. One recycled F1 saves 0.4 kg CO₂—enough to power the same controller for a week.