DN50 Electromagnetic or Mechanical Meter: What Changes in Hygienic Batching

DN50 Electromagnetic or Mechanical Meter: The Real Differences in Batching

DN50 (2 in) Promag H 300: no rotor, no shaft seal, no constriction in the measuring tube.

Both instrument types will pass product and produce a number. The difference appears in the second year, when the mechanical meter has worn, the product has changed, and the batch record has to be reconstructed. Below is how the two approaches compare on a typical 2 inch hygienic batching line.

What this means on the line

The energy argument is easy to underestimate. A restriction of a few tenths of a bar, running three shifts, is paid for continuously by the pump. On a 2 inch line the full-bore design of order code 5H3B50-AAIBAEAFBAFDCS0BA2 removes that cost, and equally removes the dead zone where the rotor housing used to sit, so cleaning chemistry reaches the whole pipe.

Where the change is felt first

• Batch repeatability improves because the zero point no longer shifts after CIP
• Product changeovers get shorter: no rotor to flush and no bearing to inspect
• Maintenance planning simplifies: seals and grounding rings are the only wear items in the loop
• Diagnostics appear in the control system instead of an operator noticing a slow batch

When a mechanical meter still makes sense

On clean, low-value, non-hygienic water lines with a stable viscosity and no cleaning cycle, a mechanical device can be the cheaper answer, and we will say so. The crossover point is hygienic duty: food, beverage and life science lines where cleaning validation, product loss and changeover time are part of the cost of ownership. There the electromagnetic sensor is usually the lower-cost option once the first year is over.

Technical summary

The DN50 unit is in stock, minimum order one piece, T/T or L/C, 12-month warranty. Send us the existing meter datasheet and the batch specification, and we will lay the comparison against your actual duty rather than a generic table.

Contact our instrumentation team for a side by side selection review.