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A corrosion-resistant radar level meter must remain suitable as a complete assembly. The antenna or probe may resist the liquid while a seal, exposed connection edge or external cable entry does not. Start the enquiry with an exposure map rather than a preferred material name.
Map Exposure Before Choosing Contact or Non-Contact Measurement
| Region | Identify | Design check |
|---|---|---|
| Liquid | Composition, concentration, contaminants and operating temperature. | Every immersed probe part needs an appropriate construction. |
| Vapour | Gas composition, condensation and splash above normal level. | Non-contact measurement still has process-facing parts. |
| Joint | Gasket, seal, lining edge and pressure-temperature duty. | A compatible antenna cannot compensate for an unsuitable joint. |
| Exterior | Fumes, washing and exposure of housing, glands and supports. | Ingress protection alone does not establish chemical resistance. |
Two Corrosion-Resistant Radar Level Meter Routes
The MV-RD901 is a non-contact liquid radar with a PTFE rod-shaped antenna. The published configuration is for atmospheric tanks, with a listed 0.3-10 m interval. Its antenna does not extend to the liquid surface as a guided wave probe would.
The MV-RD702 instead uses an insulated rod or cable in contact with the liquid. Specify the offered PFA or PTFE covering, end termination and exposed connection parts. Review rubbing, deposits and withdrawal access as well as chemistry.
Choose between those routes from the available measurement path and maintenance constraints. A coated probe may fit a duty where a free-space beam is obstructed, but coating damage or repeated fouling can make that option unsuitable. A non-contact route avoids the immersed length, not every process exposure.
Require an Assembly-Level Answer in the Quotation
Attach the material specification and operating envelope, then request a component list covering the process barrier and seals. Ask the supplier to identify the conditions that have not been confirmed. A response that only repeats acid-resistant leaves the most important selection work unresolved.
Use the actual connection drawing to check lining continuity, sealing surfaces and antenna position. Do not create a long restrictive recess merely to hide exposed parts; it may introduce an echo problem and retain condensate. Pressure suitability must be confirmed independently of chemical suitability.
Separate Containment Checks From Signal Tests
Follow the site's approved installation and containment procedure, then establish the distance reference and receiver scale. Record signal behaviour during the exposure that matters, such as warm filling or cooldown. A correct level reading does not demonstrate the long-term condition of a seal.
Plan an early safe inspection for deposits, coating damage and leakage indicators. Retain the as-found condition before cleaning. Do not open a vessel connection merely because the display says the tank is empty.
Selection Questions
Q1. Is the atmospheric MV-RD901 suitable for a pressurised reactor?
Not on the basis of this configuration. Submit the actual pressure-temperature duty and obtain a specifically suitable assembly rather than adapting the thread and assuming the rating follows.
Q2. Which document closes the material review?
A configuration-specific response tied to the supplied process information and the project's material approval procedure. A generic chart can screen choices but cannot identify every part in the delivered instrument.
Summary
Approve the measurement route and complete exposed assembly together. Request a corrosion-service review with the exposure map, chemistry and connection drawing.
