Product Description
Tuning Fork Level Switch with Digital Display
Product Overview
This vibrating fork level switch with digital display is a compact, solid-state point level detection device manufactured in China by Nik Senso Tech. Featuring an integrated display, this fork-type sensor provides real‑time frequency readout and local status indication. The unit employs piezoelectric-driven technology with no moving parts, ensuring long‑term stability and minimal maintenance.
Manufacturer
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Brand: Nik Senso Tech
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Country of Origin: China
How It Works
A piezoelectric crystal excites the tuning fork to oscillate at its natural resonant frequency. When the fork assembly becomes submerged in process media, the frequency shifts. This change is continuously monitored by the internal electronics and triggers a relay output when the preset threshold is reached, indicating a high‑ or low‑level condition. The measurement is unaffected by flow, turbulence, or foam.
Key Components
| Component | Description |
|---|---|
| Digital Display | Local screen showing the current operating frequency and switch status. |
| Vibrating Fork | Direct‑contact sensing element; manufactured from S304 stainless steel. |
| Piezoelectric Transducer | Dual‑function detector that generates vibration and detects frequency variations. |
| Electronic Circuit | Integrated DSP‑based processor with oscillator, signal conditioning, and relay output module. Includes adjustable sensitivity and self‑diagnostic functions. |
| Housing | Sealed S304 stainless steel enclosure rated for dust and moisture protection. |
| Process Connection | Standard G1″ threaded fitting for direct tank mounting. |
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 20 – 250 VAC / VDC |
| Fork Operating Temperature | –40 °C to +180 °C |
| Instrument Ambient Temperature | –30 °C to +70 °C |
| Maximum Operating Pressure | < 2 MPa |
| Minimum Medium Density | ≥ 0.6 g/cm³ |
| Process Connection | G1″ (NPT optional) |
| Housing Material | S304 Stainless Steel |
| Fork Material | S304 Stainless Steel |
| Fork Length | 100 mm (extendable / customizable) |
| Output Type | Relay contact (SPDT) |
| Number of Relays | 2, individually configurable as NO or NC |
| Enclosure Protection | IP66 |
| Explosion Protection | Ex ia IIC T6 (ATEX / IECEx compliant) |
| Cable Entry | M20 × 1.5 |
| Dimensions (L × W × Thread H) | 249 mm × 88 mm × 25 mm (G1″ thread height) |
Features & Benefits
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No calibration required – factory‑set and ready for use; no periodic re‑adjustment needed.
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High reliability – no moving parts eliminates mechanical wear and reduces downtime.
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Low power consumption – suitable for battery‑backed or remote installations.
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Versatile media compatibility – works with most liquids, pastes, and free‑flowing powders/granules.
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Easy installation – simple threaded mounting and straightforward electrical connection.
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Cost‑effective solution – competitive pricing compared to capacitive, ultrasonic, or radar alternatives.
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Intelligent diagnostics – built‑in fault detection and sensitivity adjustment for challenging applications.
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Hazardous area ready – intrinsically safe version available for Zone 0/1/2 environments.
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Galvanic isolation – optional isolated output for noise immunity and enhanced electrical safety.
Applications
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Overfill and dry‑run protection in storage tanks
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Pump protection and low‑level alarm
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Interface detection (e.g., oil/water)
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Level control in chemical, petrochemical, and refining processes
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Food, feed, and plastic granule handling systems
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Water and wastewater treatment plants
Ordering & Installation Notes
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Fork length can be customized upon request.
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Ensure medium density is ≥ 0.6 g/cm³ for reliable switching.
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Do not exceed maximum pressure and temperature ratings.
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Intrinsically safe version must be used with appropriate barriers in explosive atmospheres.
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Relay contacts are rated for standard industrial loads – verify load specifications before connection.