Pharmaceutical Tank Level Measurement, Cleaning and Batch Traceability

Level measurement in pharmaceutical raw-material and intermediate tanks is part of a controlled manufacturing system. Measurement performance, hygienic construction, cleaning coverage, material compatibility and electronic records all matter. A non-contact radar may reduce product contact, but its process connection and seal remain within the hygienic design and change-control boundary.

Define the regulated measurement duty

State whether level supports dispensing, batch quantity, pump protection, high alarm, inventory or a critical process parameter. Define accuracy, range, response, data retention and the independent reference used for verification. Do not claim weighing or custody accuracy from a standard level instrument.

Identify the applicable quality and validation requirements for the site and product. The project team should determine whether the instrument, calculation or alarm requires qualification or periodic calibration.

Review product-contact construction

List every exposed antenna, seal, gasket, flange face and process adapter. Confirm material grade, surface finish, chemical compatibility and documentation. A non-contact antenna can still receive condensate, foam or cleaning solution.

Avoid crevices, dead legs and recessed connections that retain product. Confirm drainability and installation orientation using the approved hygienic design standard rather than only the instrument's general product name.

Prove cleaning coverage

Document CIP or SIP media, concentration, temperature, pressure, duration and spray pattern. Confirm that the connection is reached by the validated cleaning process and that thermal cycling remains within seal and electronics limits.

Cleaning a visible antenna face does not prove that hidden gasket interfaces are clean. Include the instrument connection in risk assessment, inspection and validation evidence. Any purge or rinse modification belongs under change control.

Control batch and data identity

Link the device tag, tank, product, batch and timestamp in the control or manufacturing record. Preserve raw level and quality status alongside any calculated volume. A plausible value without device identity or valid status is weak traceability.

Manage parameter access, audit trail, time synchronization and backup according to site procedures. Record serial-number and firmware changes so historical data remain interpretable.

Verify alarms and failure states

Test output scaling, PLC value, HMI, historian and batch calculation through the complete chain. Check high and low alarms, pump permissives, lost echo, held value, communication loss and power recovery.

Where an independent overfill function is required, maintain separation and its own proof-test evidence. Do not infer successful safety testing from a normal batch record.

Commission and manage change

Use representative product or an approved simulation to verify low, normal and high points. Record vessel state, temperature, cleaning status, parameters and echo curves. Clearly document any untested condition and its approval.

Reassess after formulation, cleaning chemistry, seal, antenna, firmware, nozzle or control-logic changes. Store as-found and as-left evidence with the asset and validation records. Verify that restored configuration files are access-controlled, readable and linked to the correct serial number. A backup that cannot be traced to its approved device and revision is not reliable recovery evidence. Record the reviewer approval.

Engineering checklist

Define the regulated duty and reference.
Verify all product-contact materials.
Include the connection in cleaning validation.
Link device, batch, time and quality status.
Test alarms and failure handling end to end.
Apply controlled change and record retention.

Frequently asked questions

Is non-contact radar outside the hygienic boundary?

No. The antenna and process connection can still contact product, vapour and cleaning media.

Can level replace batch weighing?

Only if the validated process explicitly accepts the level-based calculation and its uncertainty; otherwise they are different measurements.

What changes require review?

Product, cleaning, wetted parts, mounting, electronics, firmware and control logic can all affect the validated state.

Need a project-specific review? Send process data, drawings, cleaning conditions and acceptance criteria through our contact page.