SiloWeigh Sensors

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Most silos on legs and skirted silos use the L-Strain sensor but SiloWeigh can use pressure sensors to measure liquid level, load cells for high accuracy and weldable gauges for special applications.
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L-Strain, advanced weight sensor

Gives accurate measurement on silo leg or skirt with little change as the structure heats and cools.  A stress sensing section measures the compression due to weight and a compensating section corrects the errors due to thermal expansion in the structure.

Weight sensor can be applied to steel, aluminum and stainless structures . . . Read more
  • Typical accuracy ±1 to 2% of full scale when all four legs are gauged.
  • Mount with bolts through holes drilled in the leg on its neutral axis, where the structure is not weakened by these holes.
  • On round legs, flat surfaced tabs are welded in place.
  • On curved surfaces such as skirts, special washers are used.
  • All-weather. Sensors, wiring and junction boxes meet NEMA-4, IP66.
  • Connect by cables and junction boxes to the DJB (digital junction box).
  • Single digital cable from all silos to an indoor location up to 1 km (3000 ft) away.
  • Radio connection when cable cannot be run.
  • Download Stress calculator Excel file to ensure that the stress is adequate.

The L-Strain weight sensor measures the stress in any metal structure and translates this into vessel weight

Liquid level sensor

Allows SiloWeigh to be used on tanks.  The combination of a pressure sensor and SiloWeigh indicator can show either the level in the tank or the volume in gallons, liters etc. if the tank is symmetrical in the vertical direction.  Accuracy is excellent.

Attach to a T-adapter in the main or spare outlet . . . Read more
  • Submersible version when T-adapter cannot be used.
  • High accuracy, typically 1/2 to 1%.
  • The expansion of the liquid with temperature does not affect the reading.
  • Additional equipment necessary for petrochemicals and other combustible liquids.
  • Up to four sensors to one DJB for SiloWeigh.Net.
  • Up to two sensors with SiloWeigh II Pro at no extra cost.
  • Low-cost addition to SiloWeigh II or SiloWeigh.Net, easy to justify.

A pressure sensor measures level in tanks, converted to volume in liters or gallons

Load cells for highest accuracy

To give the ultimate in accuracy, load cells, the ultimate weight sensors, are fitted under the silo or vessel.  Shown here is a shear beam load cell assembly supporting the leg of an agricultural type silo.

When accuracy is more important than minimizing cost . . . Read more
  • Typical accuracy ±0.02 to 0.1% of reading when all legs are mounted on load cells.
  • Load cell mounts are available up to several hundred tons per leg.
  • The vessel has to be lifted in most cases, in order to fit these load cell mounts.
  • Alternatively, the silo can be stabilized while the leg is cut to fit a new bottom plate and the load cell mount.
  • Connect up to 8 load cells to the DJB’s four inputs.

Load cell is the ultimate weight sensor, giving accuracy of better than 0.1%

Weldable gauges

For special applications, the original SiloWeigh weight sensor can be applied when bolt-on sensors cannot be used because of lack of room or other physical limitations.

These sensors require surface preparation for their application . . . Read more
  • Accuracy slightly better than the L-Strain sensors, depending on the application.
  • Requires special care, good eyesight and a steady hand during welding.
  • Two levels of waterproofing – silicone gauge covering plus outer plastic shell.
  • Special spot-welding gun with needle tip can be rented by the week.
  • Gauges must be applied to front and back of each leg.
  • Uses standard DJB and digital cable to indicator.

weight sensor is welded onto the structure to measure the stress, then converted to weight in the indicator

View videos and download brochures