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Resin reactor level measurement may be needed during charging, heating, reflux and discharge, not just at the end of a batch. Each stage can present a different surface and deposit condition. Specify the stages in which the measurement must remain valid before selecting the radar and approving its location.
Write the operating cases before choosing the thermal assembly
List feedstocks, solvents, intermediates and wash media with their relevant temperature and pressure conditions. Include vacuum operation and cleaning if present. Review the complete exposed assembly against those cases; a lens material alone does not establish compatibility.
| Stage | Selection issue | Evidence required |
|---|---|---|
| Charging | Changing composition and an incoming stream can alter the echo. | Accepted measurement through the required charge sequence and fill range. |
| Heat-up | Temperature gradients affect the nozzle, seal and housing differently. | Permitted process cases and the installed thermal-clearance drawing. |
| Reflux | Condensate can wet the antenna and create a local target. | Echo observations with the actual return and agitation arrangements. |
| Wash cycle | Cleaning chemistry and residual resin can differ from production exposure. | Material approval and a repeatable post-cleaning reference check. |
PTFE and PEEK options for resin reactor level measurement
The METRAVON MV-RD12G has a 32 mm PTFE lens and a published upper process reference of 200 deg C. The MV-RD13G uses a 76 mm PEEK lens with an upper reference of 260 deg C. These are different assemblies to review, not interchangeable temperature settings.
Do not assume that PEEK is more compatible with every solvent than PTFE. Obtain the proposed seal and connection materials as well as the lens specification. Independently quoted pressure and temperature maxima are not approval to operate at both maxima simultaneously.
Keep the real surface out of the false-echo map
Plot the shaft, blade sweep, baffles and feed pipes along the measurement path. Capture the echo with the mixer stopped and operating. Suppress only identified interference under the manufacturer's procedure; an arbitrary suppression zone near high level can hide the surface that the alarm needs to detect.
Look for deposits at the nozzle during cooling as well as during hot production. Resin that drains while hot may remain as a cured coating later. A cleaned lens followed by a short water test does not establish the interval before that coating returns.
Separate batch records from protective action
Record the measurement's quality along with its value and acquisition time. An invalid or held reading should not quietly enter a recipe total as current data. Verify the selected analogue or digital interface through the receiving controller, including scaling and any extra conversion to volume.
A continuous radar used for process control is not automatically an independent overfill safeguard. The required protection, hazardous-area documentation and failure response must be established for the project. Qualification work should include the transitions on which the process relies, without bypassing interlocks to create a test condition.
Reactor selection questions
Q1. Does a 260 deg C model permit an occasional higher excursion?
Not on the strength of that rating. Provide the full excursion with duration and pressure for a separate construction review. Do not omit it from the enquiry merely because normal batches run cooler.
Q2. Is a narrow beam enough to avoid every agitator reflection?
No. The quoted beam describes the main radiation pattern, not a hard boundary. Location, moving components and the changing surface determine the accepted echo. Demonstrate the intended measurement during the actual mixing states.
Q3. Should condensation be treated as a calibration error?
First compare the raw distance and echo with the process state. A local film or deposited material can change the selected reflection; altering the offset may conceal that fault at one level and worsen it elsewhere.
Q4. What makes a quotation complete enough to compare?
It identifies the offered antenna, seal, connection, electronics and any required approval documents, together with installation limits and qualification responsibilities. Include thermal clearances and access work so a lower transmitter price does not conceal a more difficult installation.
Summary
Approve a reactor instrument against the batch sequence, not only its final product. Submit the operating-case list and reactor section drawing to establish which METRAVON configuration can be assessed and which conditions still require demonstration.
