It is a single/ multipoint float switch based on for Archimedes principle (float) and magnetism
1.What are VFSL and VFSS models?
VFSL is a vibrating fork switch for liquids, including free-flowing liquids, slurries, and viscous liquids. VFSS is designed for solid applications, including powders and granules.
2.How does a Vibrating Fork Level Switch work?
The fork vibrates at its natural frequency through a piezoelectric crystal. When covered by the process medium, the vibration frequency changes. The electronics detect this change and switch the output relay accordingly.
3.What are the typical applications?
VFSL: High and low level detection of liquids, overflow detection, dry run protection in storage tanks, process vessels, chemical tanks, water and wastewater treatment systems, food and beverage and pharmaceutical processes.
VFSS: Level detection of powders, granules, grains, cement and bulk solids in silos, hoppers, and bins.
4.What is integral and two- part system?
In an integral system, the electronics is housed directly within the vibrating fork enclosure, forming a compact, single-unit design.
In a two-part system, the sensing fork and electronics is installed separately, with the electronics mounted remotely from the process connection for easier access and operation in high-temperature or high-vibration applications.
5.What is the typical operating temperature and pressure range?
Both VFSL & VFSS switches are available for 80 ° C as standard and 150 ° C as high temperature model.
Both switches are suitable for max. pressure of 10 kg/cm2, however high pressure upto 40 kg/cm2 is available on request.
6.Does the switch require calibration?
No. Most vibrating fork switches are factory calibrated and require sensitivity adjustment in case of viscous liquids.
7.Is the performance affected by changes in density?
Vibrating fork switches can detect a wide range of media densities and are generally unaffected by minor density changes.
8.Can it work in turbulent conditions?
Yes. Vibrating fork switches are highly resistant to turbulence, agitation, bubbles, and foam.
9.What process connections are available?
10.What insertion lengths are available?
Both VFSS & VFSL are available from 130mm to 300 mm insertion length.
11.What are the available output options?
12.What is Fail-Safe operation?
Fail-safe mode ensures the switch changes state during power failure or fault conditions, providing enhanced process safety.
13.Can the switching delay be adjusted?
Yes. Both VFSL & VFSS offer adjustable switch-on and switch-off delays using DIP switches to prevent false switching.
14.Can it be used for both high-level and low-level alarms?
Yes. It can be installed for high-level (overflow prevention) or low-level (dry-run protection) detection.
15.Can it be used in hazardous areas?
Yes. For hazardous areas switches are provided with explosion-proof enclosure or ATEX ex-proof Gr. IIC enclosures.
16.Does it require maintenance?
Very little maintenance is required since there are no moving mechanical parts.
Vibration technology has a self-cleaning effect.
17. What are the advantages over float switches?
18.Can buildup on the fork affect performance?
Light coating is generally tolerated, but heavy buildup may require periodic cleaning depending on the application.
19.What happens when the fork is covered or uncovered?
The electronics detect the change in vibration frequency and actuate the relay/output according to the configured logic (FSL or FSH).
20.Can it detect foam?
Heavy foam is usually ignored, while liquids beneath the foam are reliably detected.
21.Why choose a Vibrating Fork Level Switch?
22.What are the installation criteria for the switch?
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