Canister Load Cell / Ring Load Cell

What is a canister load cell?
A canister load cell is used for very high capacities and is shaped like a cylindrical load cell. Because of the vertical force introduction, canister load cells and cylindrical load cells can measure weights of up to 300t per load cell. Canister load cells work with strain gage measurement principle: by introducing a vertical force, the canister load cell gets compressed and a current change can be measured, which is linear to the change in weight. The cylindrical load cells work with the same measurement principle.

What is heavy duty load cell?
METTLER TOLEDO offers a wide range of heavy duty load cell or canister load cell solutions from 5kg up to 300t capacity. These heavy duty load cells are available in aluminum, plated steel and stainless steel electro-polished. They are available in various legal-for-trade accuracy levels according to OIML R60 and NTEP HB44 starting from OIML 3000e (OIML C3), NTEP 5000d, OIML 6000e (OIML C6), NTEP 10000d to finally OIML 10000e (OIML C10). Heavy duty load cells and canister load cells are available for hazardous area application and are approved according to ATEX, FM (Factory Mutual), cFM (Canada), IECEx and NEPSI. They meet protection classes IP67, IP68 or even IP69K.  Load cells support the weightless calibration CalFree or even CalFree Plus allowing for tank calibration on a fingertip.

How can I weigh a tank with a ring load cell?
The RLC ring load cell with capacity range from 250kg to 10t, allows the weighing of mid sized tanks, vessel and hopper scales. The stainless steel design, hermetic sealing and IP68 protection of these ring load cells provides the best reliability in tank weighing applications.

Why is stainless steel important for load cells?
The stainless steel housing is welded in place to create a hermetic seal to prevent moisture from entering the interior of the load cell. This prevents deterioration of performance and subsequent failures. The optional METTLER TOLEDO 0970 RingMount weigh module adds suspension, checking and anti-tipping to your RLC ring load cell and includes top and bottom mounting plates to simplify installation. Available in 316 stainless steel.

Why is a hermetic seal important for load cells?
The hermetic seal is important to prevent moisture from entering the interior of the canister load cell and cylindrical load cell and deteriorating the weighing performance or causing failure. Global metrology and hazardous area approvals allow use in most applications, regardless of the location.

What is a pin-type load cell?
A rocker pin (or rocker column / pin-type) load cell is a compression cell used in multiples under large platform scales such as truck and railroad track scales, and in tank, hopper and silo weighing. The longitudinal axis of the pin (the primary loading axis) is mounted vertically and its ends have spherical radii which contact hardened receivers; these hold the load cell and introduce the load at the central point of contact. This arrangement allows the load cells to rock (tilt) to allow the scale structure expand/contract and to absorb horizontal shocks. The radii on the pin are selected so that the load receiver is lifted progressively with increasing tilt of the load cell, thus producing a restoring force which acts to “restore” the load cells to their optimum upright position and the load receiver to its centered position.