VEGA VEGAVIB 61 Compact Vibrating Fork Level Switch

Overview

The VEGA VEGAVIB 61 Compact Vibrating Fork Level Switch is an intrinsically robust, maintenance-optimized point level detection device engineered for reliable on/off monitoring of granular and coarse bulk solids in industrial process vessels, silos, hoppers, and chutes. Operating on the principle of piezoelectric-driven resonance frequency shift, the VEGAVIB 61 detects the presence or absence of material by measuring the damping effect exerted on its precisely tuned vibrating fork when immersed. This physical principle ensures immunity to buildup, bridging, dust, vibration, temperature fluctuations, and ambient pressure changes—making it especially suitable for demanding applications in powder handling, pneumatic conveying, and gravity-fed storage systems. Its compact mechanical design allows direct mounting without auxiliary supports, while the monolithic stainless steel fork structure—free of crevices, threads, or sharp edges—eliminates material entrapment and facilitates CIP/SIP-compatible cleaning cycles. The device is certified for use in hazardous areas and complies with functional safety requirements up to SIL 2 per IEC 61508.

Key Features

• Piezoelectric excitation system delivering stable, low-power oscillation at a fixed natural frequency (typically ~1 kHz), enabling high signal-to-noise ratio and long-term drift stability
• Hygienic fork geometry with polished 316L stainless steel surfaces, radius-free contours, and no internal cavities—designed to prevent material adhesion and support sanitary process environments
• Compact housing (≤ 120 mm insertion length) with multiple mounting options: flange, threaded, or clamp connections; suitable for retrofitting into space-constrained installations
• Integrated electronics with configurable switch output (PNP/NPN, relay, or analog current loop) and status LED for local diagnostics
• Wide operating temperature range: –40 °C to +80 °C (standard); extended versions available up to +150 °C for high-temperature applications
• Robust ingress protection: IP66, IP67, and IP69K rated for washdown, outdoor, and high-humidity environments
• No calibration required after installation; zero-point verification possible without material present—reducing commissioning time and operational downtime

Sample Compatibility & Compliance

The VEGAVIB 61 is validated for use with free-flowing and moderately cohesive granular media having a minimum bulk density of 20 g/L—including plastic pellets, grain, cement, fly ash, limestone, sand, sugar, and coffee beans. It is not intended for fine powders (< 50 µm) exhibiting fluidization behavior or strongly adhesive substances such as wet clay or sticky biomass. All wetted parts conform to FDA 21 CFR §177.2600 for food-contact applications when specified with FDA-compliant elastomers (e.g., EPDM or FKM). The device carries ATEX Category 2G/2D (gas/dust) and IECEx certifications for Zone 1/21 operation. Functional safety certification includes SIL 2 according to IEC 61508 and IEC 61511, supporting integration into Safety Instrumented Systems (SIS). It meets electromagnetic compatibility standards EN 61326-1 and environmental directives RoHS and REACH.

Software & Data Management

While the VEGAVIB 61 operates as a standalone two-wire or three-wire switching device without embedded firmware updates, it is fully compatible with VEGA’s Smart Sensor Platform ecosystem. Configuration and diagnostics can be performed remotely via Bluetooth using the VEGA Tools mobile app or locally through the integrated push-button interface. Process data—including switch state history, fault logs, and diagnostic counters—is accessible via HART 7 protocol (optional) for integration into DCS, PLC, or MES platforms. Audit trails and parameter change logs comply with 21 CFR Part 11 requirements when used with VEGA’s certified engineering software suite and approved host systems. Firmware revisions are traceable and version-controlled under VEGA’s ISO 9001-certified development lifecycle.

Applications

The VEGAVIB 61 delivers consistent performance across diverse sectors requiring dependable solid-level supervision: bin high-level alarm in cement grinding circuits; low-level detection in polymer pellet feed hoppers for extrusion lines; overflow prevention in grain elevators; empty-silo signaling in animal feed production; and intermediate-level control in fly ash storage silos within power generation facilities. It is widely deployed in pharmaceutical tablet manufacturing (powder intermediate bins), food processing (flour, rice, dried fruit), and recycling operations (shredded plastics, wood chips). Its reliability in dusty, abrasive, and thermally variable conditions makes it a preferred solution where radar or capacitive alternatives suffer from false triggering or coating-related drift.

FAQ

Can the VEGAVIB 61 detect very fine powders such as talcum or silica fume?

No—due to insufficient damping effect and potential fluidization, it is not recommended for powders below 50 µm or with bulk densities under 20 g/L.
Is field calibration required after installation?

No. The device is factory-tuned and does not require recalibration. A dry-run verification confirms proper operation without material present.
What certifications apply to food-grade installations?

FDA-compliant wetted materials (EPDM/FKM seals) and EHEDG/3-A certification options are available upon request for hygienic process lines.
How does the VEGAVIB 61 handle material buildup on the fork?

Its smooth, edge-free fork geometry minimizes adherence, and the high-frequency vibration actively sheds light coatings during operation—eliminating need for mechanical wipers or air purges.
Is remote configuration supported?

Yes—via Bluetooth using VEGA Tools app or HART communication when equipped with optional digital interface module.