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)


General information

Measurement principleVibrating
Level measurement typePoint level detection
Measured mediaLiquids
Contact to measured mediumYes
Interface measurementNo
Probe length80…6000 mm/
3…236 in
Process pressure-1…64 barg/
-14.5…925 psig
Process temperature-50…250°C/
Wetted partsAustenitic stainless steel (1.4404/316L), Austenitic alloy (2.4610/alloy C4), Ethylene ChloroTriFluoroEthylene (ECTFE), Enamel, Perfluoroalkoxy alkane (PFA)
GasketsEthylene propylene diene monomer (EPDM), Fluoroelastomer rubber (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


Discrete outputs2-wire (8/16 mA), Contactless, NAMUR, Relay, Transistor


Certificates/Approvals ExATEX, CSA, EAC Ex, FM
Certificates/Approvals SafetySIL 2
Certificates/Approvals MarineGL, LR
Certificates/Approvals OthersWHG
Ingress protectionIP66/67, NEMA4/4X/6

Related products

SU 502

Single channel controller for vibration level switches with 8/16 mA output

  • Signal conditioner for simple control of point-level detection via integrated relay
  • Optional 2nd relay: configurable as fail-safe relay or as second level detection relay
  • Designed for installation on a DIN rail
  • Approved for use in hazardous areas

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