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Rosemount 2120 Vibrating Fork Liquid Level Switch

Emerson Rosemount 2120 Vibrating Fork Liquid Level Switch

Universal package to suit virtually all liquid applications

The Emerson Rosemount 2120 is based on vibrating short fork technology, making it suitable for virtually all liquid applications. Features include a complete range of process connections, wide choice of housing and wetted parts materials, five different switching functions, extended fork lengths, hazardous area, basic self-checking functionality, and overfill approvals. The 2120 can withstand temperatures up to 302 F (150 C) and pressures to 1450 psig (100 barg). This combination of features makes it configurable to almost all requirements.

The Rosemount 2120 has been TUV tested and approved for overfill protection according to the German DiBt/ WHG regulations. It is certified under safety devices for tanks and piping related to water pollution control.

  • Function virtually unaffected by flow, bubbles, turbulence, foam, vibration, solids content, coating products, liquid properties, and product variations
  • No need for calibration and requires only a minimum amount of installation
  • Easy terminal access and hook-up with electrical protections
  • No moving parts or crevices means virtually no maintenance
  • Basic electronic self-checking and condition monitoring
  • Visible Heartbeat LED shows device status
  • Adjustable Switching Delay for turbulent or splashing applications
  • Local Magnetic Test Point makes functional test easy
  • Small in size and weight
  • Short fork for minimized protrusion into pipework
  • Extended lengths up to 157.5-in. (4 m)
  • "Fast Drip" Fork Design gives quicker response time
  • General area, Explosion-proof ⁄ Flameproof, and Intrinsically Safe options
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Specifiction Packing
  • Features

    • Plastic or metal housings
    • 316 SST, Alloy C, or ECTFE/PFA co-polymer coated 316 SST wetted parts
    • Process temperatures from C40 to 302 F (C40 to 150 C)
    • Process pressures to 100 bar g/1450 PSI
    • Threaded, hygienic, or flanged process connections (now with JIS flanges)
    • Externally visible Heartbeat LED (except on metal housings)
    • Magnetic test point on side of housing
    • Easy terminal access and hook-up
    • Adjustable switching delay
    • Fast Drip fork design for responsive switching



    • Small in size and weight
    • Minimal amount of installation time
    • No mechanical moving parts or crevices
    • Maintenance free
    • Resistant to plant vibration
    • Short fork technology for minimized protrusion
    • Replaceable electronics cassettes with versatile switch outputs
    • Intrinsically safe
    • Explosion-proof (metal housing)
    Key Specification
    Certification Explosion-proof, Intrinsically Safe, and Ordinary Location
    Approved for overfill protection according to DiBt/ WHG regulations.
    Certificate number: Z-65.11-522
    Housing Glass-filled nylon (plastic), stainless steel, or Aluminum
    Wetted Material Stainless steel (1.4404), ECTFE/PFA copolymer (coated 316L SST), or Corrosion Resistant Nickel Alloy C
    IP Rating IP66 ⁄ 67
    Process Connection Threaded, flanged, or hygienic
    Electrical Connection Terminal block
    Output Direct load switching (ac or dc)
    DPDT Relay output
    PNP for Programmable Logic Controllers
    NAMUR, or
    8/16 mA
    Operating Conditions
    Process Temperature -40 to 302 F (-40 to 150 C)
    Process Pressure Up to 1450 psi at 122 F (100 barg at 50 C)
    Note: Extended lengths are available.
1pcs per carton