CST- TFL Tuning fork level switch

Level measurement

CST- TFL Tuning fork level switch is a point-level sensor used to detect the presence or absence of liquids or bulk solids in tanks, silos, or pipelines. It works by vibrating a fork-shaped probe at a fixed frequency; when the fork comes into contact with material, the vibration is dampened, and the switch outputs a signal.

Advantage

  • Universal Application – Works for both liquids and solids (powders, granules).
  • No Calibration Required – Plug-and-play; not dependent on dielectric constant, density, or conductivity.
  • High Reliability – Provides accurate switching even in extreme temperature and pressure conditions.
  • Maintenance-Free – No moving parts → long service life and low maintenance.
  • Versatile Mounting – Can be installed in tanks, silos, hoppers, or pipelines.
  • Fail-Safe Options – Can be configured for maximum safety in overflow or dry-run protection.
  • Insensitive to Build-Up – Still functions reliably even if coated with material (dust, foam, or sticky substances).
  • Compact Design – Easy to install in limited spaces.

Features

 

Specification Description
Process connection G1/4, G1/2″, G3/4″, G1″, Flange, Clamp,… Option
Diaphragm material 316L stainless steel
Housing material 304 stainless steel
Connection type M12*1 connector
Supply voltage 18…30VDC
Wiring protection Reverse polarity protection, overload protection, short-circuit protection
Ingress protection IP67
Switch repeatability ±0.25% F.S (typical)
Analog accuracy ±0.5% F.S (typical)
Temperature drift ±0.02% F.S (typical)
Annual drift ≤0.2% F.S / year
Current consumption ≤45 mA
Response time ≤3 ms
Vibration resistance 10G / 0~500 Hz
Shock resistance 50G / 1 ms
Vibration frequency 300 ± 50 Hz
Overvoltage protection Class II
Operating frequency ~1200 Hz (in air, with or without diaphragm cover)
Switching time 0.2 s (configurable, with or without diaphragm cover)
Ambient temperature -20°C … +80°C
Medium temperature -40°C … +120°C, -40°C … +150°C, Option
Output type PNP/PNP
Measured particle size ≤10 mm
Medium Liquid, powder, or granular solid
Medium density Solid ≥0.1 g/cm³, Liquid ≥0.7 g/cm³
Part number CST-TFL

Industry application

  • Food & Beverage: Sugar, flour, rice silos; liquid tanks; breweries.
  • Chemical & Pharma: Corrosive liquids, solvents, powders.
  • Cement & Mining: Clinker, limestone, coal dust.
  • Oil & Gas: Storage tanks, separators, pipelines.
  • Power Plants: Fly ash silos, fuel oil tanks.

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