Why Your Online COD Reading Is 30% Higher Than the Lab — Chloride Interference
Online analyzer: 450–550 mg/L. Lab: 320–380 mg/L.Not sensor drift. Not bad reagents.The real culprit: 3,000–5,000 mg/L chloride from textile dyeing, and an online COD method with insufficient mercury sulfate masking.…
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Why Your Electromagnetic Flowmeter Reads Wrong — The Grounding Problem
A real case: DN300 magmeter on a wastewater inlet. 3 months in, readings jumped ±15% randomly. Sunny days fine, rainy days chaotic. They replaced the transmitter, recalibrated — no fix.…
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Why Your Online Turbidity Reading Doesn’t Match the Lab
A water plant case: online turbidity held steady at 0.08–0.12 NTU for a week. Daily lab samples? 0.25–0.35 NTU. Three layers of uncertainty stack up to create that gap. 🔬…
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