Vibration Type Level Switch - VLS Series. 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.
• 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.
• The VLS can be used for 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.
VLS 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 |
|Coffee Beans |
Because of its maximum versatility, the VLS is ideal for applications where contents change are common. Thus, instrument does not require re-calibration for a new or different material.
Powder coated die-cast aluminum
Protection IP 66 and IP 67
1 cable entry (option: second cable gland)
|Power Supply|| |
Wide range power supply: 20 ... 250V AC/DC
|Power Consumption|| |
1 potential-free change-over contact (SPDT),
max. switching datas AC: 250V-AC,
8A, 2000VA, cos = 1max. switching datas
DC: 8,0A at 24V-DC / 1,5A at 48V-AC
min. switching datas DC: 24V / 100mA
|Time Delay|| |
1 second from stop of vibration
2 to 5 seconds for start of vibration
|Probe Material|| |
Stainless steel 1.4301 / AISI 304
|Process Connection|| |
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 Blade|| |
Max. tensile load of cable VLS400 : 200 kg
|LED Indication |
(On VLS200, 300 & 400)
Relay On: Red LED continuous blinking
Power On: Red LED
|Min. Density of Material|| |
|Max. Pressure Inside Bin|| |
|Ambient Temperature|| |
Electronic: -20°C ... + 60°C
|Process Temperature|| |
Probe: -20°C ... + 80°C
Probe High Temp: -20°C ... + 150°C
Note:Specifications are subject to change without notice.
For all inquiries, you may contact us through Telephone, Email or Live Chat Support.
Monday to Friday: 8.00am to 5.30pm
Technical Support (After Office Hours)
Tel: (65) 9876 6258
|By Phone / Fax||By Email||By Live Chat|
|Tel: (65) 6553 0366
Fax: (65) 6553 0828