The electronically stimulated fork vibrates at its mechanically resonance frequency of 125 Hz when the fork is free of the service material. The resonance is caused by the piezoelectric crystals. One of the piezo crystals produces a small voltage which is transmitted to the switching amplifier. If the fork is covered by the bulk material, a damping effect is produced and the piezo crystal does not produce the voltage and the amplifier will switch and a corresponding signal output is actuated. The vibration of the fork has self-cleaning properties. The light deposit on the container wall does not affect the operation of LEVSEN Vibrating Fork Level Switch

Specifications

• Housing: Die Cast Aluminum, weather proof, powder coated, Integral with the probe
• Cable entry: 2 nos.
• Ambient temperature: 0 ° C to +60° C
• Power consumption: 2 VA
• Mains Voltage: 230/110 V AC (+/-15%), 50 Hz OR18-55 V DC or 65-265 VAC
• Output: 2 sets of potential free c/o contacts rated at 5 amps, 230 V AC for non-inductive loads
• Switching delay: Continuously adjustable From 1 to 20 sec. probe Free or probe covered (Optional)
• Safety operation: Field selected switch over for min. or max. (FSL/FSH) switching points
• Switch status display: Green LED shows Normal, Red LED shows alarm
• Fork (Sensing Probe):
• Mounting: Screwed ¿ 1 ½ BSP (standard) Or Flanged (optional)
• Sensing Fork: Stainless steel SS304/SS316
• Extension: Pipe
• Probe Insertion Length: 250 mm standard, Extension up to 3000 mm
• Operating Temperature: 150 deg (standard), up to 200°C (on request)

features

• Vibration of the fork has self cleaning properties
• The light deposit on the container wall does not affect the operation
• Fast and Easy Installation
• No Calibration
• No effect of electrical properties of the Service material
• High Reliability
• Suitable for the highly dusty environment
• Field selectable operation logic
• Can be configured either for High or Low Level point switching
• Provides economical solutions

Other Details

• SUNFLOW Vibrating Fork Level Switches series VFLS are the most suitable for level detection of Free Flowing Solids across wide density range from fine powders and polymers to granules and grains up to the particle size of Ø12 mm. These are mounted from Side- Horizontally or Top-Vertically in bins, vessels silos and hoppers of application material. It can be used for level sensing & control , blockage detection, high level /overfill and low level protection

Application

• Plastics, Powders, Flour, Cement, Coal Powder, Fly ash , Lime Powder, Bulk Solids Handling, Chemical, Pharmaceutical, Food, Paper, and many others in the form of solid powdery, granules