Model VHL





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Model VHL    Vibrating Fork Point Level Sensor for Liquids


Proven Technology, High Value!


The Model VHL is a vibrating fork level detection sensor with a relay output, ideal for high, low and intermediate level detection and control of a wide range of liquid and slurry material.  This device uses piezoelectric and solidstate electronics technologies, offering a universal AC/DC power supply, a SPDT relay output and a variety of probe lengths.  The Model VHL is a liquid level sensor that is economical and very reliable.


  • Polished vibrating fork is standard
  • PFA coated or hygienic extreme-polished fork available
  • Unaffected by dielectric constant, conductivity, viscosity, pressure and temperature
  • Relay output in compact enclosure
  • High process temperature of 266°F (130°C)
  • Short, standard, long and extended probe lengths
  • IP67 (NEMA 6) rated enclosure



For More Information

Click here to download product line PDF’s.

  1. Model VHL Sales Flyer
  2. Model VHL Technical Information Installation, Operation and Maintenance Instructions

Principal of Operation

Model VHL vibrating fork level switches are suitable for level detection of a wide range of liquids. The operation principle is based on an electronic circuit exciting piezoelectric crystals, thereby making the fork probe vibrate. As the fluid or medium reaches and covers the fork its vibration changes, or stops completely. The fork will start vibrating again as the fluid sets it free. The electronics sense the change of vibration and causes the relay contacts to change state.

Application and Use

Mounted on pipes or tanks the filling and emptying of vessels can be controlled using the Model VHL as they can generate fail-safe alarms (on power failure) providing overfill or dry run protection where switching of high current loads is required (refer to technical specifications for relay).

Technical Data Summary

Power Supply

20-255VAC, 50/60Hz;



AC: 1.2-17VA

DC: <3W

Enclosure Protection

IP67 (NEMA Type 6)

Process Density

≥ 0.7 S.G. (0.7 g/cm³)

Maximum Pressure

588 psi (40 bar)

Maximum Viscosity

10,000 cSt (mm2/s)

Medium Temperature

-40°F to +266°F

(-40°C to +130°C)

Ambient Temperature

-22°F to +158°F

(-30°C to +70°C)

Local Indication

Bi-Color LED

Alarm – Red. Normal – Green


SPDT Relay, 8A @ 250VAC

Probe Material:

316Ti Stainless Steel

(DIN 1.4571)

Housing Material:

PBT Fiber-Reinforced, Flame Retardant, Painted


CE Mark

Standard Sensor Model Includes

  • Short Probe (2.7"/69mm long)
  • Standard Probe (4.9"/125mm long)
  • Long Probe (7.9"/200mm long)
  • Extended Probe (12"-118"/300mm-3,000mm)
  • Ordinary Locations



Call To Order Now!


Ordering Information – Sensor

Sensor Final Assembly Part Number Structure

4 5 - 1 X 1 1 - 1 1 X

Probe Length

1 - 2.7" (69mm)

2 - 4.9" (125mm)

3 - 7.9" (200mm)

4 - Extended (12" – 118")

Process Connection

1 - 1" NPT

BlueLevel Technologies, Inc.   |   |   Phone: 330-523-5215   |   Fax: 330-523-5212

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