The 2-Channel Loop Detector (NND-3802 / NVD-3802), also known as a metal-mass detection detector, is an electromagnetic device that switches its relays according to the density of the metal passing over it. It is mostly used in car-park systems – for the automatic opening/closing of sliding gates and barriers or during automatic ticketing – to detect whether a vehicle is present at a suitable point on the road surface. When a few turns of cable laid in the ground are connected to the loop-detector board, an electromagnetic field is created over the road surface; changes in this field are used to detect metal density, and the relays make contact to activate the system.
Features
- 2 loop inputs
- 2 relay outputs
- Lower cost thanks to fewer antenna turns
- Easy to use
Technical Specifications
| Loop Input | 2 |
| Relay Output | 2 |
| Display | Numeric display |
| Buttons | 2 |
| Power | 12–24 AC/DC |
| Working Current | at 24VDC: min 15 mA, max 60 mA |
| Relay Contact Rating | 10A 250V |
| Operating Temperature | -40°C / +85°C |
| Mounting | Surface mounting |
| Dimensions | 70 x 90 x 25 mm |
Areas of Use
- Car-park automation
- Arm barrier
- Side-sliding gate
- Bollard barrier
- Road blocker
- Shutter
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