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Vibration level switch LD

ENG LD Instructions Manual.pdf.pdf ENG LD technical characteristics.pdf.pdf RUS LD технические характеристики.pdf.pdf

Series LD Vibrating Level Switches

The LD Series consists of reliable and compact vibrating level switches designed for level detection in liquids (model LD61) and bulk solids (model LD60). They feature no moving parts, ensuring low maintenance, and are made from corrosion-resistant materials such as stainless steel EN 1.4404 (AISI 316L) for the process connection and fork, with optional HALAR® coating.

Operating Principle

The LD Series level switches operate based on the change in the natural resonant frequency of the vibrating fork when it comes into contact with liquid or bulk material. The internal electronics detect this frequency shift and switch the output signal to indicate the level status.

Characteristics

  • Models: LD60 (for solids), LD61 (for liquids), LD6XN (NAMUR Ex output), LD6XR (relay output), LD6XML (extended detection length).

  • Materials: Process connection and fork — EN 1.4404 (AISI 316L); housing — polyamide/polycarbonate; HALAR® coating available on request.

  • Temperature: Process fluid from -30°C to +115°C; ambient from -20°C to +70°C (standard), -5°C to +40°C (NAMUR version).

  • Pressure: Nominal PN25 (others on request); maximum pressure depends on temperature.

  • Connections: Threaded G1 ISO 228-1 or 1” NPT; flanged EN 1092-1 DN40 PN25; sanitary ISO 2852, SMS 1145, DIN 11851, TRI-CLAMP®.

  • Technical parameters: Switching delay ~1 s; hysteresis ±2 mm (for H₂O); liquid density >0.6 kg/l; viscosity up to 10,000 cSt; detection length up to 2 m; power supply 24–250 VAC/VDC or 8–14 VDC (NAMUR); protection IP65/IP67; LED status indication.

Applications

  • Pump control.

  • Open and pressurized tanks, mixers.

  • Level detection in open channels and empty/full pipes.

  • Distillation columns and evaporators.

  • Chemical dosing tanks.

Advantages of Vibrating Level Switches

  • No moving parts, resulting in minimal maintenance.

  • Insensitive to changes in temperature and pressure.

  • Suitable for highly viscous liquids (up to 10,000 cSt) and low-density media (>0.6 kg/l).

  • Wide range of process connections, including sanitary versions.

  • Fast response time and reliable detection with options for relay output, NAMUR Ex, or extended insertion length.