We’re running 2.5 mm Fe / 3.0 mm non‑Fe test pieces on a 600 mm conveyor and seeing about 1.8% false rejects when product temp dips below 2°C — anyone successfully push sensitivity while holding rejects under 0.5% via signal suppression or aperture changes? I’m weighing X‑ray for 12–14 mm frozen entrée components, but I’d rather optimize the current setup first (verification every 2 hours, purge at 300 ms) if there’s a proven path.
Auto-learn at ‘below 2°C’ and lock phase; add aperture reducer — dual-frequency available?
We added an EMR discharge checklist: pull maternal RSV status from the state IIS and if it’s not verified or was <14 days pre‑delivery, we give nirsevimab at discharge using your <5 kg/≥5 kg split — belt and suspenders. Before October we’re flipping on an auto-page to schedule outpatient dosing if discharge is >7 days before season start, aligning with CDC timing: https://www.cdc.gov/rsv/whats-new/rsv-immunizations.html. Are you ingesting IIS data automatically or leaning on parent attestation?
Building on @liam_john87’s phase lock, the one change that cut our cold‑temp false rejects from about 1.7% to 0.3% was shrouding the head and holding the coil at about 22°C with a small heater, which stabilized phase/product effect without loosening 2.5 Fe / 3.0 non‑Fe; could you fit a simple heated cover around the aperture?
Try splitting into two product profiles and auto‑switch by infeed temp — drop in an RTD, learn one at ≤2°C and one at normal, and have the PLC toggle so the cold profile uses a slightly wider phase window/low‑freq weighting; that took our cold‑temp ‘product effect’ rejects from about 1.7% to 0.4% while holding 2.5 Fe / 3.0 non‑Fe, like swapping lenses when the light changes. Minor trade‑off: you might give up about 0.2 mm on non‑Fe unless your head supports channel weighting — what model are you running?
Swapping in UHMW aperture fillers to shrink the effective head height to about 15–20 mm above your tallest entrée let us push sensitivity while holding rejects about 0.4% at 0–2°C; re-learn with the filler installed and keep the metal‑free zone clean, and you may give up a hair on stainless unless your head supports channel weighting (nice primer: https://www.mt.com/us/en/home/library/white-papers/product-inspection/optimizing-metal-detection.html). Can you fit fillers on that frame?