2120 Vibrating Fork Level Switch
SKU: 2120
Mid-tier vibrating fork level switch — same fork-resonance principle as the 2110, with expanded electronics options. Choose direct-load relay, 8/16 mA load-driven output for two-state PLC inputs, NAMUR-namur compatibility, or remote-electronics housing. Magnetic test point lets technicians verify operation without process intervention. Used where the 2110's basic relay isn't sufficient — load-driven inputs, harsh ambient, hazardous-area installations.
Contact us for pricing on this product.
Mid-tier vibrating fork level switch — same fork-resonance principle as the 2110, with expanded electronics options. Choose direct-load relay, 8/16 mA load-driven output for two-state PLC inputs, NAMUR-namur compatibility, or remote-electronics housing. Magnetic test point lets technicians verify operation without process intervention. Used where the 2110's basic relay isn't sufficient — load-driven inputs, harsh ambient, hazardous-area installations.
The Rosemount 2120 Vibrating Fork Level Switch # 2120 is manufactured by Rosemount. Valley Instrument Service is an authorized Rosemount dealer offering full sales support, NIST-traceable calibration, and expert technical assistance.
Have questions about this product?
Our team can help with product selection, specs, pricing, and application support.
Contact Us or Call (661) 327-8681Configure Your Rosemount 2120 Vibrating Fork Liquid Level Switch
Vibrating-fork liquid level switch — fork resonance changes when wet vs dry. Unaffected by flow, turbulence, bubbles, foam, vibration, or solids content. Heartbeat LED indicates operating state. Suitable for overfill protection, water ingress detection, pump-protect, high/low alarm, hygienic, and fine chemical/pharma applications.
Required Specifications
7 of 7 selected- Material of Construction:
- CAlloy C (UNS N10002), Alloy C-276 (UNS N10276), solid+$746.72
- Process Connection Size:
- 5R1.5" (38mm) Tri-clamp+$182.08
- Electronic Type:
- KNAMUR+$84.91
- Surface Finish:
- 1Standard Surface Finish
- Hazardous Locations Certifications:
- NANo Hazardous Locations Certifications
- Housing:
- AGlass Filled Nylon (M20 Conduits / Cable Threads)
- Fork Length:
- A0000Standard Length (44mm / 1.7 in)
Rosemount is configurator-heavy and quote-only. Valley Instrument verifies option compatibility, lead time, and pricing before confirming your order.
Related Products
2110 Vibrating Fork Level Switch
Compact, low-cost vibrating fork level switch — point-level detection for liquids using fork vibration frequency change when wet vs dry. Single direct-load relay output (DPCO or PNP/NPN), no moving parts, no calibration, immune to flow turbulence and aerated/foaming liquids that defeat float and capacitance switches. Best for high/low alarms, pump dry-run protection, and overfill prevention on storage tanks. Common process connections (NPT, BSP, Tri-Clamp, flanged) and fork extensions to 4 m. The workhorse Rosemount level switch for general-process duty.
2130 HART Vibrating Fork Level Switch
HART-enabled vibrating fork level switch — same proven fork-resonance technology as the 2110/2120, with two-wire 4-20 mA + HART communication for remote configuration, diagnostics, and trending of fork frequency. Continuously reports fork health (build-up detection, corrosion warning) so a maintenance team can replace before the switch fails. Best for plants with HART-aware asset-management systems (AMS, FieldComm).
2140 SIL Vibrating Fork Level Detector
Functional-safety-certified vibrating fork level detector — same fork-resonance core as the 2130 with full IEC 61508 SIL 2 (single) / SIL 3 (redundant) certification for safety-instrumented systems. Best for overfill prevention, dry-pump protection, and other safety-critical applications where the underlying detection technology must carry an independent third-party safety certification. HART or two-channel digital output with diagnostic coverage.
2160 Wireless Vibrating Fork Level Switch
WirelessHART-powered vibrating fork level switch — same proven fork-resonance technology as the 2110/2120 family but with battery-powered WirelessHART radio in place of wired output. Eliminates cable and conduit runs for remote level monitoring on tanks far from the control room. 7+ year battery life under typical update rates. Pairs with an Emerson Wireless 1410S Gateway for the WirelessHART network backhaul. Common application: tank-farm overfill alarms where wired installation is cost-prohibitive.