Load cells for tank, silo and hopper weighing

Vessel weighing is where installation error dominates. A cell with a better accuracy class will still read badly if the load path is wrong or the vessel breathes thermally.

Hopper, silo and tank installations are the most common industrial weighing application and the one where most measurement problems originate. The load path is rarely what the drawing shows: vessels deflect, expand and contract, and agitators apply side loads that were never in the calculation.

What actually goes wrong

These are the failure modes we see repeatedly in tank, silo and hopper weighing installations. In most of them, better hardware would not have helped.

Vessel breathing and thermal expansion

A steel silo expands measurably between 5 °C and 40 °C, and the expansion is not symmetric. This shows up as zero drift that no amount of cell accuracy will fix.

Agitator side load

Mixing motors impose lateral forces well outside the rated load path. A shear beam tolerates this; a single point does not.

Uneven load distribution

Vessel legs rarely sit on a level foundation. Without corner trim adjustment, one cell carries more than its share and the reading is wrong before any tolerance is even considered.

Material build-up on the cell

In dusty applications the cell surface fouls and the load path changes. A cleaning access and the right mounting height matter more than the IP rating.

Models used in this application

These are the models our engineers usually start from for tank, silo and hopper weighing. The specification on each product page is the full one — no abbreviated versions.

SB-200

Single-ended shear beam

25 kg / 50 kg / 100 kg / 200 kg / 500 kg / 1 t / 2 t

Accuracy
C3
Protection
IP67
Combined error
≤ 0.02 %F.S
Creep
≤ 0.015 %F.S
Full specification →

WM-500

Weighing module

50 kg / 100 kg / 250 kg / 500 kg / 1 t / 2 t / 5 t

Accuracy
C4
Protection
IP68
Combined error
≤ 0.015 %F.S
Creep
≤ 0.01 %F.S
Full specification →

DB-10

Double-ended shear beam

5 t / 10 t / 15 t / 20 t / 30 t / 40 t

Accuracy
C3
Protection
IP67
Combined error
≤ 0.03 %F.S
Creep
≤ 0.03 %F.S
Full specification →

Selection notes

  • Shear beam or compression for vessel legs, never single point — the load path is not a platform
  • Weighing modules remove the baseplate design work entirely and arrive pre-aligned
  • Corner trim adjustment in the junction box is not optional on a multi-leg vessel
  • Size for the filled weight plus agitation thrust, not the empty weight

Tank, silo and hopper weighing questions

How many load cells does a hopper need?

Three or four is the usual minimum for stability. Divide the filled weight by the number of cells, then size each cell above that share with headroom for impact loading and thermal movement.

Do I need a weighing module or can I use plain load cells?

A weighing module arrives as a complete assembly with baseplate, rocker and load cell already aligned. If your fabricator would otherwise have to design and machine the baseplate, the module is almost always cheaper in total and faster to install.

How do I handle the vessel expanding with temperature?

You cannot stop it, you can only measure it. Keep the cell as far from the hot surface as the design allows, use shielded cable with a temperature-compensated model, and record the zero at a known reference temperature. On critical applications, a second reference load cell in a stable corner is the standard correction.

Is a junction box required on a tank installation?

On any multi-cell installation, yes. The junction box provides corner trim adjustment so the load distributes evenly, and it protects the connectors. For washdown zones use a sealed IP67 or IP69K box with cables entering from below so water cannot pool at the gland.

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