Model CTF Mini Tuning Fork Level Switch

Compact, Cost Effective, DIN Connection

The Model CTF Mini Tuning Fork Level Switch is an ideal choice for level control of powders. The CTF incorporates a piezoelectric crystal that vibrates the fork at its natural frequency, when contact material is present it dampens the vibrations and the switch changes state. This series offers a PNP or NPN output.

Product Applications

  • Chemical processing
  • Pulp and paper processing
  • Mining
  • Food and beverage

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

Model Description Usually Ships* Price Code Order
Ships: Same Day
Price: $304.00
Mini tuning fork level switch with NPN output. Same Day* $304.00 B Order
Ships: Same Day
Price: $304.00
Mini tuning fork level switch with PNP output. Same Day* $304.00 B Order


Dry powder compatible with wetted materials.
Min. bulk solid density: 4.4 lb/ft3 (70 g/l).
Wetted Materials:
Tuning Fork: 316 L SS; Process connection: 304 SS.
Temperature Limits:
Ambient: -40 to 140°F (-40 to 60°C); Process: -40 to 212°F (-40 to 100°C).
Pressure Limit:
600 psi (40 bar).
Power Requirement:
12 to 55 VDC.
Power Consumption:
10 mA @ 12 to 24 VDC; 0.5 W (max.).
Aluminum, painted.
Enclosure Rating:
Switch Type:
3-wire PNP/NPN output.
Electrical Rating:
350 mA (max) @ 12 to 55 VDC.
Conduit Connection:
Valve plug DIN 43650.
Process Connections:
1" male NPT.
Indication Lights:
External red LED.
Sensing Delay:
Max. covered probe: 1 to 3 s.; Uncovered probe: 1 to 3 s.
2.2 lb (1.0 kg).
Agency Approvals:


  • DIN connection and compact size allows for application in places a larger tuning fork level switch may not be suitable, providing great versatility
  • No mechanical moving parts with no routine maintenance required
  • Unaffected by the dielectric constant of the sensed material, making it superior to a capacitance level switch for applications where the dielectric constant is too low, where there is more than one material being used in one vessel, and when material moisture content can change
  • Ideal for applications where the bulk density is too low for a rotating paddle level switch


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