Application

Level Measurement and Inventory Control in Pharmaceutical Plants

Answer in brief

In pharmaceutical production the measurement has to stand up in a batch record.

That changes the requirements: the instrument has to be cleanable, qualified and traceable, not merely accurate.

Prefer weight over level where the number goes into the record.
Mount instruments so they can be cleaned.
Qualify the measurement, not just the instrument.

Reviewed October 21, 2026 · Updated October 21, 2026

The problem

Powder surfaces are uneven, so a level reading is an estimate of inventory, while weighing gives a figure that can be defended in a record.

Desired outcome

A measurement that is accurate enough for the decision it supports, cleanable in place and documented for qualification.

Process approach

Load cells under vessels give the figure that batch records need, with the installation designed to avoid force shunts through pipework.

Where level is required, hygienic mounting and flush-fitting sensors keep the vessel cleanable.

Status indication at the vessel helps operators see the state without reading a screen in another room.

Weighing for values that enter the batch record.
Hygienic, cleanable mounting for level sensors.
Local status indication for operators.

Selection factors

Whether the value supports a batch record or only an operation.
Cleaning method and the mounting it allows.
Accuracy required and how it is qualified.
Force shunts from pipework on weighed vessels.
Explosion protection where applicable.

Common failure modes

Level reading used where a weight was required
Rigid pipework shunting force around the load cells
Sensor mounting that cannot be cleaned
Measurement qualified as an instrument but not as a method

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