Load Cells for Tanks: How to Weigh Tanks, Hoppers and Mixers
Updated November 6, 2026
The short answer: to weigh a tank, hopper or mixing tank, you put a load cell weigh module under each leg (compression) or hang the vessel from one or more tension cells, then sum them through a junction box into an indicator. Pick compression mounts for vessels that stand on legs and tension cells for small suspended hoppers. Size the cells from the empty tank weight plus the heaviest full load, with headroom for agitators, wind and uneven loading. The biggest accuracy killers are rigid piping and vibration, not the load cells themselves.
Why weigh a tank instead of measuring level
Level sensors measure height. Weight measures what is actually in the tank, so it isn't fooled by foam, vortexes from a mixer, irregular tank shapes, temperature changes or product that changes density between batches. That's why batching, mixing and inventory systems in food, chemical, feed and plastics plants usually weigh the vessel. It also works for powders and granules that bridge or cone in a silo, where level readings can be misleading.
Compression or tension: which setup fits your vessel
- Compression weigh modules sit under each leg or support bracket. They suit most floor-standing tanks, hoppers, mixers and silos, from a few thousand pounds to very large vessels. Mounts with built-in stabilizers or check rods stop the vessel from shifting or lifting off.
- Tension cells hang the vessel from above, usually with S-type load cells or an isolated tension module. They suit smaller hoppers and bins hung from a mezzanine or beam, and conversions where the vessel is already suspended.
Three supports are the most stable arrangement because each leg always carries its share of the load. Four legs are common and work well when the floor is level and the mounts are set correctly. Every support needs a load cell; a "dummy" leg on a solid block makes the readings unreliable.
How to size load cells for a tank
- Add the empty weight of the vessel (including the agitator, motor, platforms and anything bolted to it) to the heaviest full load.
- Divide by the number of supports to get the load per cell.
- Add headroom. Uneven loading, agitator forces, wind on outdoor silos and shock from dumping all add load. Don't size cells at their limit.
Rice Lake's Load Cell and Weigh Module Handbook walks through the sizing math and mounting rules in detail. If you're unsure, send us the vessel drawing and weights and we'll help with the numbers. Never load a module beyond its rated capacity.
Mixing tanks, agitators and vibration
Mixing tanks get a lot of searches for good reason: the agitator shakes the vessel and pushes sideways on the supports. To keep readings steady:
- Use stabilized mounts or check rods that handle side loads, so the load cell only sees vertical force.
- Choose an indicator with adjustable filtering, and take batch weights with the mixer stopped where the process allows.
- Size up the cells to cover the dynamic load from the agitator.
Piping, thermal expansion and other accuracy killers
Anything rigid connected to the tank carries part of its weight, so the scale reads short. Use flexible connections (hoses, bellows or flexible couplings) on inlet and outlet lines, run pipes horizontally for a distance before the first support, and keep walkways and ladders off the vessel. Tanks that heat up or cool down expand and contract, so mounts with sliding pins or self-aligning designs let the vessel move without side-loading the cells.
Tank weighing kits and prices
Prices are from SellEton product pages at the time of writing (November 2026) and change with capacity, so check the product page for the current figure.
| Model | What it is | Price |
|---|---|---|
| SellEton SL-730-TM kit | Single-ended shear beam modules, stainless indicator and summing junction box; 5,000 to 80,000 lb | $2,845 to $6,401 |
| SellEton SL-313-TM kit | Four double-ended beam modules with stabilizer mounts, indicator and junction box; 5,000 to 500,000 lb | $4,024 to $30,834 |
| SellEton SL-352-TM kit | Low-profile modules for tanks, hoppers and decks; 5,000 to 500,000 lb | $4,364 to $23,719 |
| Rice Lake EZ Mount 1 | Mild steel compression mounts with RL72020 double-ended shear beams; sliding pin design; 5,000 to 250,000 lb per module | $432 to $13,656 |
| Sensortronics 65059 mini tank module | Compact module for small tanks and hoppers | $564 to $3,828 |
| Rice Lake ITCM isolated tension module | Tension mounting for suspended hoppers and bins | $679 to $10,356 |
Browse every option in our tank weighing kits, Rice Lake weigh modules and load cell kits and weighing modules collections.
Installation and safety
This guide is general information, not an engineering design. Lifting a vessel onto weigh modules affects its structure, anchoring and seismic or wind restraint, so have the supports checked by a qualified engineer and the scale installed and calibrated by a qualified scale technician. If you sell product by weight from the tank, check the legal-for-trade rules with your state weights and measures office first. Our junction box guide and load cell wiring and trimming guide cover the wiring side.
Tank weighing FAQs
How many load cells does a tank need?
One per support. A tank on three legs needs three weigh modules, one on four legs needs four. Small suspended hoppers can hang from one tension cell or from several.
Can I add load cells to an existing tank?
Yes. Conversion kits are designed for that. The vessel is lifted, the modules go under each leg and the system is calibrated. Plan for flexible pipe connections at the same time.
How accurate is tank weighing?
It depends on the cells, the mounts and above all the installation. A well-installed system with flexible piping and a steady vessel is far more accurate than one with rigid pipes and vibration. Calibration with test weights or a known material transfer confirms the result.
What load cells are best for mixing tanks?
Compression weigh modules with stabilizers or check rods, sized with extra headroom for the agitator's dynamic forces. Stainless steel is the usual choice in food, chemical and washdown areas.
Get help with a tank scale
Send us the vessel type, number of legs, empty weight, maximum load and environment, and we'll suggest a kit. Call SellEton Scales at (844) 735-5386 or send us a message. Our weighing system integration guide covers connecting the indicator to a PLC or software.