Vibration level switch for process applications

  • Point level detection of liquids
  • Large choice of process fittings, housings and electronics
  • Density: ≥0.5 g/cm3 / 0.018 lb/in3
  • -50…+250°C / -58…+482°F; -1…64 barg / -14.5…928 psig
  • Icon/Logo Security Integrity Level 2 (SIL 2)

OPTISWITCH 5100 C – Version with plastic housing

Vibration level switch OPTISWITCH 5100 C – Version with plastic housing

The OPTISWITCH 5100 is a vibration level switch for liquids in process applications. It is a universal and reliable device for limit level detection in vessels. It detects low or high level and is used for overfill, dry-run or pump protection. Installations in pipelines are also possible.

Product highlights

  • Large choice of process fittings and housing materials
  • Optional adapter for high temperatures up to +250°C / +482°F
  • Outputs: relay, transistor, 2-wire, NAMUR or contactless electronic switch
  • Optional gas-tight lead-through for toxic gases
  • Suited for hazardous and non-hazardous areas
  • SIL2-compliant

Typical applications

  • Pump dry-run protection
  • Limit and overfill detection
  • Liquid detection in pipes
  • SIL2 loops / Safety-related Safety Instrumented Systems (SIS)


Product details

Alternative product categoriesTuning fork, Vibration fork, Vibronic

Technical data

Measurement principlesVibrating
Level measurement typePoint level detection
Measured mediaLiquids
Contact to measured mediumYes
Interface measurementNo
Probe length80…6000 mm/
3…236 in
Process pressure (relative)-1…64 barg/
-14.5…925 psig
Process temperature-50…250°C/
Wetted partsAustenitic stainless steel (1.4404/316L), Austenitic alloy (2.4610/alloy C-4), Ethylene ChloroTriFluoroEthylene (ECTFE), Enamel, Perfluoroalkoxy alkane (PFA)
Process sealsEPDM, FKM/FPM, Kalrez® 6375, PFA

Process connections

Flange connectionsEN (1092-1): DN25…150
ASME (B 16.5): 1…6"
Thread connectionsMale:
G¾, G1
¾ NPT, 1 NPT, 1 ½ NPT, 2 NPT


Binary outputs2-wire, Contactless, NAMUR, Relay, Transistor


Certificates/Approvals ExATEX, CSA, EAC, FM
Certificates/Approvals SafetySIL2
Certificates/Approvals MarineGL, LR
Certificates/Approvals OthersWHG
Ingress protectionIP66/67, NEMA4/4X/6

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SU 501

Level signal conditioner for vibrating level switches

  • Signal amplifier for vibrating level switches
  • Transmission of 8/16 mA current shift signals for level signalling
  • For use in hazardous areas and Safety Instrumented Systems (SIS)
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