FM160 Electronic turbine flow and Temperature sensor

High-viscosity media usually refer to substances such as oils, asphalt, heavy oils, paints, inks, adhesives, syrups, cosmetic pastes, and food slurries.

1. No moving parts, resistant to adhesion and clogging

Function: The probe rod of a capacitive sensor is stationary and has no moving parts. Even if the medium is extremely viscous and may even form "material adhesion" on the probe rod, it will not get stuck like a float ball. As long as it is correctly selected and set up, it can still work stably.

Application scenarios: In asphalt storage tanks, paint mixing tanks, and glue reaction vessels, this is its most core advantage.

2. It can handle the problem of material adhesion (through special design and calibration)

Function: Material adhesion is the biggest "enemy" of capacitive sensors in high-viscosity applications, but it is not insurmountable.

Coaxial sleeve structure: For media that are prone to material adhesion, probes with insulating layers (such as PTFE/ polytetrafluoroethylene) and coaxial protective sleeves are preferred. This structure confines the electric field for measuring capacitance between the probe end and the sleeve, and the material adhering to the probe rod body (with stable dielectric constant) will be automatically "shielded", minimizing its impact. The measurement is mainly sensitive to the part of the probe end that is not covered.

Software compensation: Advanced capacitive transmitters feature a "material hanging compensation" function. It can identify and subtract the reference capacitance generated by the stable hanging material layer, thereby ensuring that the reading reflects the true liquid level.

Application scenario: In resin storage tanks in the chemical industry, this probe with an insulating sheath is a standard configuration.

3. Adaptability to changes in medium properties

Function: The dielectric constant of high-viscosity media is usually stable. Once calibrated on-site for empty and full tanks, the sensor can establish an accurate linear relationship between capacitance changes and liquid level height. Even if there are minor changes between batches of media, they can be adapted to by recalibration.

Application scenario: It is used to measure the liquid level of paints or inks with different formulas. Simple calibration is sufficient when changing batches.