NABCO SMD-105-01 Automatic Door Motion Sensor Unit

Description

Product Introduction

The NABCO SMD-105-01 is an industrial-grade microwave motion detection sensor designed for commercial and industrial automatic sliding, swinging, and folding doors. Operating on K-band microwave radar frequency, this unit mounts overhead to monitor approach zones. It sends a precise dry-contact trip signal to the main door controller board the moment a person or material-handling cart enters the target field.

Unlike passive infrared (PIR) detectors that struggle when ambient temperatures match human body heat, the SMD-105-01 relies strictly on physical Doppler motion. Rain, dust, and shifting thermal currents won’t trigger false trips. It delivers consistent activation speeds on high-traffic entryways where reliable door cycling protects climate control and security boundaries.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

The “Trench” Reality

It is 2:15 AM on a sub-zero winter night. A hospital emergency room sliding door locks wide open because an ancient sensor shorted out internally. Cold air rushes into the triage zone, forcing staff to haul out space heaters while maintenance scrambles. You don’t need a whole new door package. You need an exact drop-in sensor swap that takes ten minutes with a screwdriver, matches the existing wire harness, and resets the controller trip loop immediately.

Target Applications

• Hospital Cleanrooms & ER Entrances – Overhead motion detection – Fast response time ensures touchless hands-free passage for gurneys without false trips from cross-traffic.
• Cold Storage Facility Vestibules – Outer thermal boundary doors – Ignores fog, condensation, and rapid ambient thermal swings that blind optical PIR sensors.
• Retail & Commercial High-Traffic Entryways – Heavy-duty automatic sliders – Broad pattern coverage handles fast-walking pedestrians approaching at oblique angles.
• Manufacturing Logistics Hubs – Forklift and AGV entry points – Rejects small overhead airborne debris while consistently picking up solid rolling machinery.

Field Replacement Case

A pharmaceutical distribution site faced $1,200 an hour in climate control penalties when their main loading corridor slider stopped closing automatically. The original SMD-105-01 sensor circuit board had taken a power spike from a nearby lighting strike. Swapping in a pre-tested SMD-105-01 unit restored the original factory relay timing with zero rewiring required on the master NABCO header controller. Downtime was capped under forty minutes.

Transparency SOP: Quality Assurance & Testing

We do not simply ship pulled boxes. Every NABCO unit goes through rigorous workbench testing before entering inventory:

1. Inbound Visual & Physical Inspection: Pin/terminal check, housing integrity audit, and verification against original Nabtesco anti-counterfeit manufacturing stamps.
2. Bench Power-On Test: Sustained 24V AC/DC burn-in on our test rig to check current draw and voltage tolerance stability under load.
3. Radar Field Mapping: Moving target simulation across high and low sensitivity settings to verify detection angle accuracy and potentiometer sweep range.
4. Relay Contact Diagnostics: Resistance check across the NO/NC dry contacts under cycle load to ensure zero contact pitting or sticky relay behavior.
5. Final Cleanroom Pack: Anti-static ESD bag sealing with silica gel packets to shield sensitive microwave antennas during transport.

SMD-105-01

SMD-105-01

The Veteran’s Tech Trap Guide

⚠️ Trap 1: The Dip Switch / Potentiometer Trap

Before pulling the dead card, take a high-res photo of the potentiometer dial positions and dip switch pins. If you drop the replacement in with factory default sensitivity, the door might ghost-trip continuously off a nearby metal wall or swinging panel.

❗ Trap 2: Ignoring Cable Strain and Terminal Block Wear

The screw terminals on these vintage headers strip easily if overtightened. Hand-tighten with a #0 precision screwdriver. Do not use power drivers. A single stripped thread means replacing the entire wiring connector plug.

⚠️ Trap 3: Fluorescent Light Interference

Do not point the radar head directly at high-frequency fluorescent fixtures or large industrial HVAC fans. K-band radar can pick up the electronic flicker from old ballasts or spinning fan blades, causing the door to cycle open randomly at night.

Frequently Asked Questions

Q: Is the NABCO SMD-105-01 still actively manufactured by Nabtesco?

No. The SMD-105-01 is a legacy model. Most original supply chains now list it as discontinued. We supply new-surplus units and fully tested refurbished stock to keep legacy door installations running without forcing a $3,000 complete operator overhaul.

Q: Can I substitute an infrared sensor for this microwave radar unit?

You can, but you probably shouldn’t if the door opens to the outdoors. Infrared detects thermal radiation changes, meaning direct sunlight, heat blasts, or snow can trigger false openings. Microwave radar relies on physical movement, making it far more reliable in exposed environments.

Q: How do I change the field detection pattern width?

Pattern width and depth are controlled via the internal mechanical angle adjuster on the radar horn inside the casing, combined with the gain potentiometer on the PCB. Tilt up for longer depth; turn the gain counterclockwise to narrow the trigger area.

Q: Is this unit hot-swappable while the main door operator is powered?

No. Always turn off power at the main door controller header panel before touching signal wiring. Shorting the 24V supply line to the relay trigger line will destroy the input optocouplers on the main operator control card.

Q: What warranty covers your refurbished NABCO components?

Every unit carries a full 12-month replacement warranty. If the relay sticks or the radar horn degrades within a year of installation, we replace it directly from our tested surplus stock.