Description
Where they’re used
- Automatic gates and boom barriers (open on approach / safety hold‐open)
- Roller doors and shutters (open/close, free exit)
- Carpark entries/exits & ticket machines (presence / count)
- Drive‑throughs & queuing lanes (call‑up)
- Traffic signals, weigh stations & access control points
- Warehouse and loading docks (forklifts & trucks)
How a loop works (in plain English)
An insulated cable loop embedded in the pavement forms an inductor. A small AC signal from the loop detector energises the loop; metal in a vehicle changes the loop’s inductance and the detector registers a presence.
You can configure it to provide a presence output (while a vehicle is over the loop) or a pulse output (on entry/exit), with adjustable sensitivity and frequency to avoid cross‑talk with nearby loops.
Why choose a saw‑cut loop
- Proven reliability – robust in harsh weather & heavy traffic
- High accuracy – distinguishes vehicles from pedestrians
- Invisible install – tidy, flush‑sealed finish
- Flexible geometry – tailored loop size and shape to suit the site
- Cost‑effective – long life, low maintenance
Typical specifications
- Slot width/depth: 4–6 mm wide × 30–50 mm deep (surface dependent)
- Corners: 45° chamfered to protect cable insulation
- Backer: Closed‑cell backer rod above cable to control sealant depth
- Sealant: Traffic‑grade polyurethane or bituminous loop sealant, UV‑stable
- Cable: XLPE or PE insulated, 1.5–2.5 mm² stranded copper
- Twisted lead‑in: 5–8 twists/m from loop to detector to reject noise
- Turns: Usually 3–6 turns (depends on loop size & detector range)
- Detector: 12–240 V AC/DC depending on controller; relay or solid‑state outputs; selectable frequency to minimise cross‑talk
What you’ll get from us
- Site assessment and layout recommendation
- Professional saw‑cut, cable and sealing
- Detector supply, wiring & commissioning
- Test & tuning report
- 12‑month workmanship warranty (extended options available)
FAQs
Will it detect bicycles or pedestrians? No—induction loops detect large metal masses. Small motorcycles can be covered with appropriate geometry and tuning.
How long does installation take? Most single loops are completed in a few hours including curing; complex sites may take longer.
Can you install in wet weather? We avoid wet installs to protect the seal and cable; we’ll reschedule for best results.
What if the pavement is cracked? We relocate or adjust geometry to sound pavement or recommend preformed loops during resurfacing.
