Chemicals

In a chemical plant the weighing usually happens around containers rather than products on a belt: a drum or an intermediate bulk container on a floor scale, a bulk bag on a frame or a platform, a batch of liquids or powders added to a vessel, or a pallet checked against a declared weight. What matters first is the weight range of those containers, how the reading is used – a filling or batching target, a receipt check, or a dispatch record – and how much precision the process needs at the low end of the range.

The material drives the choice of equipment more than the weight does. Liquids, powders and granules behave differently on a platform, and spills and residues are normal in a plant. A washdown area, hosed floors and vapours in the air all point to a sealed indicator and sealed load cells, a stainless or coated platform, and a cable route that does not lie in the wash water. Where containers are moved by forklift or by hand, the platform and its edges have to take that handling.

The area itself brings requirements that the customer’s own engineering and safety side decides, not the weighing supplier: whether the location needs special protection for electrical equipment, whether earthing and bonding of the scale and the container have to be provided to plant standard, which materials of construction are accepted for the product handled, and which local rules apply. These are best stated by the plant as requirements we then work to.

Finally, batching and traceability. If a scale feeds a recipe or a batch, the interface to the plant control system, the way the operator is guided to the target, and the record of the batch matter as much as the platform. Where a weighing system becomes part of a larger plant, the connection and the data are worth deciding early.