Vibration level switch with rigid extension for hygienic applications

  • Point level detection of liquids in the food, beverage and pharmaceutical industry
  • Probe length: up to 6000 mm / 236"
  • Density: ≥0.5 g/cm3 / 0.018 lb/in3
  • -50…+250°C / -58…+482°F; -1…64 psig / -14.5…928 psig
  • Icon/Logo Security Integrity Level 2 (SIL 2)

OPTISWITCH 5250 C – Version with aluminium housing and thread connection

Vibration level switch OPTISWITCH 5250 C – Version with aluminium housing and thread connection

The OPTISWITCH 5250 is a vibration level switch with a polished probe extension and tuning fork for liquid hygienic applications. It is a universal and reliable device for level detection in vessels. It detects low or high level and is mostly used for overfill, dry-run or pump protection. Installations in pipelines are also possible.

Product highlights

  • Polished tuning fork with a large choice of hygienic process fittings
  • Optional gas-tight lead-through for toxic gases
  • Outputs: relay, transistor, 2-wire, NAMUR or contactless electronic switch
  • Optional adapter for temperatures up to +250°C / +482°F
  • In compliance with FDA and EC1935/2004

Typical applications

  • Hygienic and sanitary applications in the food, beverage and pharmaceutical industries
  • High/low level detection, overfill, dry-run protection in tanks

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)
Process sealsEthylene propylene diene monomer (EPDM), Fluorocarbon-based synthetic rubber (FKM/FPM), Kalrez® 6375, PFA

Process connections

Thread connectionsMale:
G¾, G1
¾ NPT, 1 NPT
Hygienic connectionsDairy screw (DIN 11851): DN40
Tri-Clamp®: 1", 1 1/2"
Varivent®: N
SMS (1145): 38 mm
Cone: DN25
Fitting with compression nut: F40 (PN25)


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


Certificates/Approvals ExATEX, CSA, EAC Ex, FM
Certificates/Approvals SafetySIL2
Certificates/Approvals Hygienic3A, EC 1935/2004, FDA
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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