Water Electromagnetic Flow Meter

Function

Water-to-cement ratio is the single most influential parameter governing hardened concrete strength and durability. The electromagnetic flow meter controls water delivery to within ±0.5–1.0 litre per batch across a range of 50–1 000 litres, enabling the mix design w/c to be consistently achieved batch after batch without manual intervention. Faulty meters introduce systematic w/c errors that are invisible to the plant operator until cube test or durability results deteriorate — with potential contractual consequences for the delivered concrete.

Construction & quality

Meter body is flanged carbon steel or 316 stainless steel lined with hard rubber or polyurethane for chemical resistance. Electrodes are Hastelloy C, 316 stainless steel, or titanium selected by process water chemistry (hard bore water, recycled water, or softened water). The electromagnetic coil assembly is epoxy-potted and rated to IP67. The integral converter displays instantaneous flow rate and batch total in litres on a backlit LCD and provides a configurable pulse output (pulses per litre) plus 4–20 mA analogue. Process connections are flanged to PN10/16 or ANSI 150 lb. Each meter is factory-calibrated with a certificate traceable to national flow standards.

When to replace

• Batch water volume consistently higher or lower than set-point without valve or pump change
• Zero-flow reading drifting when the water valve is confirmed closed
• Transmitter displaying empty-pipe fault code or coil continuity alarm
• Visible internal lining cracking or electrode fouling due to hard-water scale on inspection
• No pulse output to batch controller despite confirmed water flow through the line