Chinese
Spanish
Russian
Portuguese
French
German
Indonesian
Thai
Vietnamese
Arabic
Italian
Turkish
Polish
Japanese
A tuning fork that switches in water is not automatically qualified for every liquid in the plant. Tuning-fork level switch selection must use the properties of the operating liquid and the intended sensing condition. Minimum density, viscosity and residue can matter differently, so a liquid name alone is an incomplete enquiry.
Provide properties at the conditions that occur
| Property | Information the supplier needs |
|---|---|
| Density | The relevant minimum and its temperature or composition basis. |
| Viscosity | Operating and cooling conditions that affect flow into and away from the fork. |
| Residue | Whether deposits drain, remain sticky, crystallise or bridge the sensing area. |
| Exposure | Process and cleaning fluids, temperature, pressure and wetted-material requirements. |
State which values are measured and which remain estimates. A supplier should identify the limits for the exact offered fork and settings. Do not apply a density threshold or viscosity limit taken from another manufacturer's model to an unspecified instrument.
Tuning-fork level switch selection includes the return-to-clear condition
A switch must detect the required material condition and return appropriately when that condition ends. Plan representative covered and uncovered observations, including the residue left after normal draining. A clean water dip may demonstrate basic switching but not clearing after a sticky production batch.
Define whether the intended target is liquid, dense foam or another local condition. Obtain evidence for that duty rather than relying on a general statement that forks ignore foam. Specify the required response without making unsupported claims about a safety function.
Keep a documented RF alternative distinct
The METRAVON MV-SP601 is an RF admittance point-level switch with rod and cable configurations. It is not a METRAVON tuning-fork model. Its coating-rejection circuitry addresses certain unwanted deposit responses, but is not a self-cleaning function or proof that any material bridge will be ignored.
Where this alternative is relevant, compare the sensing location, vessel electrical reference, probe arrangement and receiving output. Replacing a fork with an RF probe changes the sensing mechanism and installation requirements; do not transfer the old fork's material limits or test procedure.
Use the switching-point and nozzle installation checks when turning the selected liquid duty into a vessel drawing. The required detection elevation must be checked against the actual assembly.
Q1. Can one switch be approved for all recipes after one successful test?
One successful test establishes the liquid, temperature, residue and settings represented by that test. Compare the other recipes and cleaning or cooldown states against the exact model's limits. A meaningful change in density, viscosity or retained deposits needs its own review; repeat the relevant covered and return-to-clear observations rather than transferring the first result to every recipe.
Q2. Does a sensitivity adjustment establish suitability for a lighter liquid?
Only settings permitted by the exact model's documentation should be used. A sensitivity change may alter the response but does not demonstrate reliable operation outside the specified liquid-density range. Obtain the applicable limits and the supplier's proposed verification method before relying on an adjustment for a lighter liquid.
Q3. What should the quotation identify?
Identify the sensing principle, exact model, process connection, exposed materials, output and the liquid conditions used for selection. Include required documents and acceptance checks in the agreed scope. If the requisition requires a tuning fork, an RF admittance probe is a different technical proposal and needs separate approval; a suitable connection or similar alarm function does not make the two devices interchangeable.
Summary
Order against the liquid and residue conditions, not a successful water demonstration. Provide the property record and sensing duty to review a documented MV-SP601 alternative where appropriate.
