Rosemount Liquid Level Switch The Rosemount Liquid Level Switch is designed using the principle of a tuning fork. A piezo-electric crystal oscillates the forks at their natural frequency. The frequency of the vibrating fork sensor changes depending on the medium in which it is immersed. The denser the liquid, the lower the frequency. When used as a low-level alarm, the liquid in the tank or pipe drains down past the fork, causing a change of natural frequency that is detected by the electronics and switches the output state. When 2110 is used as a high-level alarm, the liquid rises in the tank or pipe, making contact with the fork which then causes the output state to switch. Features and Benefits Direct load switching with plug connection (2 wire) 21 to 264 Vac 50/60Hz, 21 to 264 Vdc
Process connection size / type is 1-in. BSPT (R) thread
Operating temperature ranges between -40°C and 150°C
Rugged stainless steel body and fork, the ideal choice for OEM applications
Compact, lightweight design, perfect for small vessel or pipe installations
Safe and easy electrical hook up
Magnetic test point for simple functional test
4-way plug connection polarity insensitivity and short circuit protection
Fast Drip fork design gives quicker response time, especially with viscous liquids
The ’heartbeat’ LED gives an instant visual indication that the unit is operational
Hygienic connections available, the fork shape is optimized for hand polishing to meet hygienic requirements
No moving parts or crevices for virtually no maintenance
Magnetic test point makes functional test easy
Threaded process connection

Connection type of 3/4in BSPT (R) thread Applications Overfill protection
High and low level alarms
Leak detection
Run dry or pump protection
Pump control or limit detection
Hygienic applications Certifications IP66/67 rated
The industry standard DIN 43650 plug/socket is used for a fast connection