One metal fragment in a PET bottle can shut down a brand. Watch how the Chaoqiang CQ-918 inline metal detector guards a real coconut water production line — bottle by bottle, at full line speed.
Real footage from a coconut water bottling facility: PET bottles pass through the CQ-918 inspection zone while the line keeps running at full speed.
In beverage production, contamination sources are everywhere: worn pump seals, screen mesh fragments, mixing blades and valve seats can shed metal particles at any moment. For a coconut water brand shipping to supermarkets and retailers worldwide, one contaminated bottle means a recall, a complaint and a damaged label.
Bottled drinks are fast-moving and wet — the two conditions that make metal detection most demanding. High moisture content creates strong product effect signals that can mask real contamination or trigger false rejects on ordinary detectors.
The CQ-918 is a second-generation digital metal detector engineered with phase tracking, product tracking and automatic balance correction — developed specifically to keep detection stable on high-salinity, high-moisture products like coconut water.
Mirror-polished stainless steel construction meets hygiene requirements, while an FPGA-based DDS system with advanced DSP processing delivers strong anti-interference performance on an electrically noisy bottling floor.
Standard tunnel height series — or customized to fit your bottle dimensions.
| Parameter | 80 | 120 | 150 | 180 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|---|
| Detection tunnel height (mm) | 80 | 120 | 150 | 180 | 200 | 250 | 300 |
| Sensitivity: Fe (φ mm) | ≥0.5 | ≥0.6 | ≥0.7 | ≥0.8 | ≥1.0 | ≥1.2 | ≥1.5 |
| Sensitivity: Non-Fe (φ mm) | ≥0.8 | ≥1.0 | ≥1.0 | ≥1.5 | ≥2.0 | ≥2.0 | ≥2.0 |
| Sensitivity: 304 SUS (φ mm) | ≥1.0 | ≥1.2 | ≥1.5 | ≥2.0 | ≥2.0 | ≥2.5 | ≥3.0 |
Maintains stable high-precision detection on wet, conductive products where conventional detectors drift.
Automatically adjusts and compensates for product-effect changes — fewer false rejects, more real detections.
Extends machine service life and keeps sensitivity consistent over years of operation.
High-performance FPGA DDS technology with advanced DSP processing for strong anti-interference on noisy production floors.
Stores 55 product parameter sets (customizable) — switch products in seconds, no re-tuning.
USB and Ethernet data interfaces, plus IP65 waterproof rating, available on request.
Hygienic stainless steel, precision components and a control system your operator will master in minutes.
The CQ-918 installs inline between filling and packaging — fully automated, no operator intervention.
Filled and capped PET bottles enter the detection tunnel on the existing conveyor — no change to line layout.
The electromagnetic field inspects every bottle for Fe, non-Fe and stainless steel fragments — wet or dry product.
Phase tracking and product tracking compensate for the water content effect, distinguishing real metal from product signal.
Contaminated bottles are automatically removed by pusher, flap or air-blast rejector; clean bottles continue to packaging.
Send us your product samples — our engineers will run them through the CQ-918, verify detection on your specific contamination risk, and configure the right tunnel size and rejector.
