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WFI tank level measurement requires more than a radar that can detect a clean water surface. Water-for-injection service places the instrument connection within a controlled process, where construction, cleaning and qualification evidence matter. A non-contact measurement principle does not remove the antenna, seal and process connection from that review.
Inspect the process-facing assembly, not just the lens material
Ask for a sectional drawing identifying every exposed surface and seal. Review recesses, joints and drainage with the site's hygienic-design and quality personnel. The material name alone cannot establish surface finish, cleanability or suitability for the intended cleaning and sterilisation cycle.
The METRAVON MV-RD12 is described as an industrial liquid radar with a PTFE lens and threaded or flanged connections. Its published page does not establish a hygienic connection, pharmaceutical qualification package or approval for WFI service. It should therefore not be specified for this duty merely because PTFE and non-contact measurement appear in the description.
WFI tank level measurement needs an evidence-based hold point
| Evidence | Question before purchase approval |
|---|---|
| Construction | Does the exact assembly drawing identify exposed materials, seals and installation orientation? |
| Cleaning | Is the proposed construction compatible with the specified chemical and thermal cycle? |
| Drainage | Can the installed connection be assessed for retained liquid and inaccessible spaces? |
| Records | Are the project-required material, calibration and qualification documents available for this version? |
The responsible project team must define the applicable acceptance and documentation requirements. This list is a procurement review aid, not a declaration of regulatory compliance. If required evidence is missing, keep the instrument selection open or seek a documented hygienic design; do not convert a general industrial offer into an approved sanitary assembly by changing its description.
Separate operating performance from process qualification
A device may read the liquid accurately while its connection remains unsuitable for the cleaning process. Conversely, a documented hygienic assembly still needs a measurement review for the tank's nozzle, level interval and operating states. Plan these as two related acceptance activities rather than treating either as a substitute for the other.
Include conditions during cleaning and restart, not only normal storage. Temperature limits for individual parts must not be combined into an assumed assembly rating. If the proposed configuration or seal changes after review, have the affected documentation and installation assessment reconsidered before release.
Questions from pharmaceutical projects
Q1. Does non-contact mean no wetted-material review is needed?
No. Vapour, condensate, splashing and cleaning media can reach process-facing components even when the antenna is above the stored liquid. Assess the real exposure and construction.
Q2. Can a general product certificate complete site qualification?
It may support a defined part of the evidence, but does not demonstrate the installed process's performance. The quality team must determine what installation and operational verification is required.
Summary
No WFI-approved MV-RD12 configuration is established here. Submit the hygienic construction and documentation requirements first; proceed to a product proposal only if the exact assembly can be supported by the required evidence.
