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Radar level trials in a batch tank should cover the stages that make measurement difficult, not just the convenient period before production. A clear-water check cannot establish performance during a foaming reaction or a steaming cleaning step. Agree which stages need a valid level and which require the process to remain restricted if that value is lost.
Schedule Radar Level Trials Against the Batch Recipe
List the stages in their operating order and identify the intended target in each one. The liquid surface, top of foam and a deposit inside the nozzle are not interchangeable targets. If the process needs liquid level beneath foam, a reading at the foam top is a measurement failure for that duty even if it is stable.
| State | Check | Use of the result |
|---|---|---|
| Initial charge | Known liquid reference before mixing or heating. | Establishes a baseline without claiming the later stages will behave identically. |
| Reaction | Liquid reference where safely available, process timing and echo record. | Tests whether the required target remains measurable during the difficult stage. |
| Discharge | Falling surface and recovery from earlier disturbance. | Shows whether the value returns correctly without an arbitrary reset. |
| Cleaning | Defined measurement requirement and equipment state. | Separates a cleaning restriction from a production measurement failure. |
The MV-RD12G is a high-temperature liquid radar candidate. Its thermal construction is relevant to a hot connection, but it does not supply a universal foam-penetration allowance. Present the chemistry and cycle to the supplier rather than describing the whole duty as steam service.
Record Failures as Well as Successful Readings
Define the maximum interruption and recovery behaviour the process can tolerate, using the plant's operational assessment. Record lost-target periods and the receiving controller's response. A test report that omits these intervals because no number was available cannot demonstrate continuous service.
If a safe independent liquid reference is unavailable during the most difficult stage, record that limitation explicitly. Agreement with another unqualified instrument is not independent proof. A restricted trial or a different measurement arrangement may be necessary before automatic control is accepted.
Batch-Trial Questions
Q1. Can a stable reading after cooling approve the hot stage?
No. It demonstrates recovery under the later conditions. Keep hot-stage observations separate, including any signal loss and operator action. Release only the operating states supported by the test evidence.
Q2. Should settings be changed during every batch?
Routine manual adjustment can conceal a duty that has not been qualified. First determine why different stages require intervention. Any authorised configuration strategy needs a controlled procedure and repeat testing; it should not depend on an operator guessing which echo is correct.
Summary
A useful trial proves the required measurement through the defined recipe and documents where it cannot. Submit the stage table, safe reference method and acceptable interruption criteria with a hot batch-tank radar enquiry before treating one successful static reading as approval for production.
