Endress+Hauser FTL33 Series Vibration Level Switch Level Switch, Threaded Mount, Housing Polybutylene Terephthalate

This vibration level switch detects the presence or absence of bulk solids or liquids by sensing mechanical oscillation changes and is intended for industrial process monitoring. It is supplied with a long interconnection cable and is mounted via a threaded fitting, making it suitable for in-line installation where continuous level signalling is required. The enclosure is manufactured from a durable polymer to provide environmental protection for the sensing electronics.

• Operating range from -40°C to 70°C enables wide temperature use
• Withstands system pressures up to 10 bar to 25 bar for pressurised vessels
• Draws only 15 mA permitting low-power instrumentation integration
• Supplied with a 1000m cable for remote installation flexibility
• Threaded mount ensures straightforward installation in existing ports
• Polybutylene terephthalate housing resists many industrial environments

• Suitable for point-level detection in silos and hoppers
• Used for overflow protection in pressurised tanks
• Ideal for remote monitoring where long cable runs are required
• Can be used for pump protection in bulk-handling processes

It operates with a very low current demand of 15 mA, allowing integration with PLC inputs and low-power monitoring circuits without substantial modification.

The unit uses a threaded mounting interface, enabling replacement into standard process ports or adaptors on existing vessels.

The construction is rated to tolerate pressures up to 25 bar, permitting use on sealed or pressurised tanks where point detection is required.

The device is specified for continuous operation between -40°C and 70°C, covering sub-zero storage and elevated process temperatures.

The enclosure is formed from polybutylene terephthalate, offering chemical and mechanical resilience suitable for many process environments.