Level Measurement

Vibration Type Level Sensor

VLS Series (Solid Level Measurement)

VLS series vibration type level sensor solid measurement

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Vibration Type Level Switch – VLS Series is designed for solid level measurement. The blade of the probe vibrate on its resonance frequency. When filling material covers the blade of the probe, the vibration stops. This is sensed by the electronic circuitry and the output relay switches. When the blade gets uncovered, the vibration will restart and the relay will switch back.

The VLS series is a piezoelectric driven vibration type level switch that detects the level in bins, silos and hoppers, filled with grained or powdered materials (bulk solids). The instrument can be used for overfill protection, for high or low level alarm.

Vibration Type

The blade of the probe vibrate on its resonance frequency. When filling material covers the blade of the probe, the vibration stops. This is sensed by the electronic circuitry and the output relay switches. When the blade gets uncovered, the vibration will restart and the relay will switch back. As only the tip of the vibrating blade is sensitive and not the base, build-up on the container wall has no influence on the function of the instrument. The shape of the blade and its vibration have a self-cleaning effect.

VLS Series vibration type level sensor solid level measurement application

  • Only the tip of the vibrating blade is sensitive and not the base, build-up on the container wall has no influence on the function of the instrument.

  • The shape of the blade and its vibration have a self-cleaning effect.
  • No – Moving parts, maintenance required and calibration required

  • Unaffected by – Environmental changes (e.g. temperature, pressure, humidity), material changes, dust clouds and agitation
  • Maximum – Versatility
  • Design – Single Prong – The single prong design with its sharp edged vibrating blade prevents material build-up typically associated with the dual prong “tuning fork“ design.

VLS series vibration type level sensor sensing element

  • The VLS Vibration Type Level Switch can be used for solid level measurement of light material with densities as low as to 10 g/liter. Strong stainless steel construction makes the VLS tough for the use with heavy materials such as cement.
  • Fail-safe – The electronic circuit of the VLS indicates power failure. If power supply fails the relay drops into alarm condition.

The VLS series is a piezoelectric driven vibration type level switch that detects the level in bins, silos and hoppers, filled with grained or powdered materials (bulk solids). The instrument can be used for overfill protection, for high or low level alarm.

It is designed for the detection of all kind of dry bulk solids, powered grain or granular state The following list shows some of the materials the VLS has been successfully used for:

Powdered Milk / Tea (leaf) / Wood Shavings / Frozen Chips / Salt / Chalk / Beans / Flour / Styrofoam / Sugars / Spices / Cellulose / Sweets / Soda / Glass Ground / Coffee Beans / Pellets / Granular Plastics  / Coffee Ground / Animal Food / Powdered Clay / Peanuts / Carbon Black / Polysterene / Tobacco / Chemicals / Gravel / Grain / Foundry Sand / Sawdust

Because of its maximum versatility, it is ideal for applications where contents change are common. Thus, instrument does not require re-calibration for a new or different material.

EnclosurePowder coated die-cast aluminum
Protection IP 66 and IP 67
1 cable entry (option: second cable gland)
Power SupplyWide range power supply: 20 … 250V AC/DC
Power Consumption3VA
Relay1 potential-free change-over contact (SPDT) – (option: DPDT),
max. switching datas AC: 250V-AC,
8A, 2000VA, cos = 1max. switching datas
DC: 8,0A at 24V-DC / 1,5A at 48V-AC
Time Delay1 second from stop of vibration
2 to 5 seconds for start of vibration
Probe MaterialStainless steel 1.4301 / AISI 304
Process ConnectionVLS100:1” NPTM
VLS200/300/400: 11/2” NPTM
Optional : Screw on flange accordingly to DIN, ANSI or JIS
Max. Load: Max. Vertical and Horizontal Load Upon the End of the BladeVLS100: 80N
VLS200/300/400: 100N
Max. tensile load of cable VLS400 : 200 kg
Power Consumption3VA
LED Indication
(On VLS200, 300 & 400)
Relay On: Red LED continuous blinking
Power On: Red LED
Min. Density of MaterialVLS100: 50g/liter
VLS200/300/400: 20g/litervibration
Max. Pressure Inside Bin10 bar
Ambient TemperatureElectronic: -20°C … + 60°C
Process TemperatureProbe: -20°C … + 80°C
Probe High Temp: -20°C … + 150°C

 Note:Specifications are subject to change without notice.