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Chemical storage tank level measurement starts with the contents and operating cycle, not a universal corrosion-resistant sensor. A tank that alternates between product, rinse liquid and cleaning solution exposes its process seal to several duties. The quotation must describe the complete assembly that can withstand those duties while measuring the required surface.
Prepare one service sheet for each tank duty
Identify the chemical constituents, concentration range, normal and abnormal temperature, pressure or vacuum, and cleaning conditions. Include vapour and condensate exposure above the liquid. The tank tag should lead to this service sheet, so an instrument approved for one vessel is not moved to another solely because the flange fits.
| Part | Exposure | Order detail |
|---|---|---|
| Lens | Vapour, splash, condensate and deposits | Material and cleaning method compatible with the full service. |
| Seal | Chemicals at the actual pressure and temperature | Exact seal selection, not only a generic elastomer family. |
| Connection | Process load, corrosion and tank movement | Thread or flange standard, material, rating and dimensions. |
| Housing | Outdoor weather, chemical mist and nearby heat | Enclosure and cable-entry arrangement for the installation area. |
Match chemical storage tank level measurement to the assembly
The METRAVON MV-RD12 is a non-contact liquid radar with a 32 mm PTFE lens and a listed 0.1-30 m measuring interval. Its small antenna may fit a suitable tank nozzle, but the PTFE lens alone does not establish compatibility of the seal, flange or housing.
For a heated duty beyond the approved standard construction, review the MV-RD12G. Its published process-temperature upper limit is 200 deg C, subject to the selected assembly. A higher thermal rating does not make it chemically suitable for every hot acid, alkali or solvent.
Prove the measurement before using the tank table
Check the nozzle bore, length and antenna position against a section drawing. Locate fill pipes, coils and mixers along the full path to the lowest liquid level. Define whether foam is part of the occupied height or whether the process needs the liquid surface beneath it; the required target determines what a successful trial must demonstrate.
At agreed safe reference levels, compare raw distance, local level and the receiving PLC value. Only then validate the volume conversion against the tank's geometry and datum. Do not adjust the sensor to conceal a wrong tank table. Record the conditions of each test, including chemical grade and temperature, so later changes can be assessed.
Questions that affect approval
Q1. Does non-contact measurement keep every component away from chemicals?
No. The antenna face and connection remain exposed to the tank atmosphere, and mist can reach external components. Review liquid, vapour and cleaning exposure separately when approving materials.
Q2. Can the continuous reading serve as independent overfill protection?
That is a separate design decision requiring the site's risk assessment and relevant evidence. An ordinary process indication does not establish independence or a safety integrity rating. Confirm the protective arrangement and test method before accepting a transfer-control design.
Q3. What documentation is needed for a classified area?
Provide the site's classification and required protection concept, then obtain documents for the exact offered instrument and installed accessories. Do not accept an enclosure description or a family-level claim as evidence for the complete assembly.
Summary
A chemical-tank quotation should identify the service sheet, dimensioned connection, material selection and receiving input. Approve the measurement and mechanical construction together, with unresolved compatibility or protection questions explicitly settled before purchase.
