ModMAG M2000 — Electromagnetic Flow Meter

Specifications

Communication Options

Common Applications

• Municipal and industrial water and wastewater treatment
• Chemical processing and other conductive process liquids
• Food, beverage and pharmaceutical processes (sanitary sensor)
• Oil and gas — produced water and conductive process fluids
• Batching and dispensing with preset-batch control and scalable pulse outputs
• Custody transfer and regulated billing (OIML R49 / MID MI-001, Class 1 and 2)
• Remote monitoring and metering through AquaCUE connectivity

Design & Selection Considerations

• Keep the flow tube full — a partially full bore reads high and erratic. The standard empty-pipe-detection electrode flags a drained line and stops measuring to protect accuracy, but it will not correct a chronically low one — mount the meter in a low point or a rising run so the bore stays flooded. Air in the tube means bad numbers; pipe it so the meter never sees a half-full bore.
• Give it straight run — or specify the zero-straight-run version — turbulence off elbows, pumps, and valves skews the velocity profile and the reading. Allow roughly 3 pipe diameters upstream and 2 downstream for full accuracy; where the layout is tight, specify the M2000 OIML/MID zero-straight-run (0×DN) build that holds its rated accuracy with no straight run. Bolt a standard meter straight onto an elbow and you forfeit the rated accuracy — design the run in, or order the meter that does not need it.
• Match the liner to the fluid and its temperature — the liner is the wetted barrier, so it sets the chemical and temperature limits: PTFE / PFA / ETFE for chemicals, high temperature (to about 150°C), and potable water; hard rubber for water and abrasive / slurry service (to about 80°C). The liner — not the steel tube — sees the fluid, so spec it to the chemistry and the temperature.
• Match the electrode alloy to the fluid — Hastelloy C-22 is standard and covers most services; 316 stainless, tantalum, platinum / rhodium, or gold-/platinum-plated electrodes handle aggressive or special-purity media. The wrong electrode alloy corrodes or fouls and the signal drifts off.
• Ground the meter to the fluid — a mag meter measures millivolts and must share an electrical reference with the liquid — use grounding rings (304 / 316 stainless or Alloy C) or order the built-in grounding electrode, especially in lined or plastic pipe that insulates the fluid (rings are required on hard-rubber liners 4 in. and larger, and on all PTFE-lined sizes). Skip the grounding and you get noise, drift, and unstable readings.
• Size to velocity, not to the pipe — the meters read from 0.03 up to 10–12 m/s, but accuracy is best well above the low-velocity floor (the M5000, for one, holds ±0.5% only above 0.5 m/s). On an oversized line, drop a meter size with reducers so the velocity lands in the accurate band instead of crawling at the bottom of the span. Size the meter to the flow, then fit it to the pipe — not the other way around.
• Plan for abrasion and electrode coating in dirty service — in slurry, sludge, and scaling service a hard-rubber liner resists abrasion better than PTFE, while greasy, fatty, or scaling fluids can slowly coat the electrodes and pull the reading off over months. Spec the liner for the solids and plan periodic electrode checks. A clean install in dirty service can still drift later — design for inspection.
• Confirm the fluid conducts — and reach for the right technology if it doesn’t — an electromagnetic meter reads only a conductive liquid: the M-Series needs conductivity above 5 µS/cm (above 20 µS/cm for demineralized water), so hydrocarbons, oils, gases, and pure / DI water fall outside its range. That is a technology fit, not a dead end — for those fluids reach for ultrasonic on clean, high-purity, or DI water, vortex on steam and gas, or a turbine or positive-displacement (oval-gear) meter on oils and hydrocarbons. Check conductivity early so you size to the right meter technology from the start.