Guided radar (TDR) level transmitter for liquids with hygienic requirements

  • Continuous measurement of level and interface in small and narrow vessels
  • Conform to FDA, EC1935/2004, EHEDG
  • Measuring range: 0.6…4 m / 2…13 ft
  • -50…+150°C / -58…+302°F; -1…40 barg / -14.5…580 psig
  • Icon/Logo Security Integrity Level 2 (SIL 2)

OPTIFLEX 3200 C–Compact version with polished Ø8 / 0.32 mm single rod probe

OPTIFLEX 3200 Guided radar (TDR) level transmitter – Version with single rod

The OPTIFLEX 3200 is a 2-wire guided radar level transmitter based on the Time Domain Reflectometry (TDR) technology. It is designed for the measurement of level and interface in the food, beverage and pharmaceutical industry. The TDR is insensitive to steam, foam or condensation and suitable for a large variety of liquids with hygienic requirements. The wetted parts have a gap-free hygienic design that ensures simple and reliable cleanability (CIP/SIP). Dedicated industry-specific probes and process connections as well as various converter and electronic versions are available to suit every installation and facilitate device access.

Product highlights

  • Hygienic probes and process connections for the food and beverage as well as pharmaceutical industry
  • Suitable for SIP (Sterilisation In Place) and CIP (Cleaning In Place)
  • Insensitive to steam, foam and condensation
  • Measurement of interfaces starting at 50 mm / 1.97"
  • Various converter and electronic versions to facilitate access to the device:
    • Available as compact version (C) or with remote converter (F) up to 100 m / 328 ft
    • Horizontal or vertical housing to suit every installation
  • Converter is rotatable and removable under process conditions
  • Cast stainless steel or aluminium housing
  • ±2 mm /±0.08" accuracy
  • Real-time clock for event logging
  • 3-year warranty

Typical applications


  • Level and interface measurement of liquids in hygienic applications with finished and raw products
  • Applications with storage tanks, vessels, mixers and containers

Food and beverage industry

  • Fruit extract, compote
  • Raw milk, cheese
  • Beer, wine
  • Yeast
  • Fruit juice, tomato sauce, soup
  • Vegetable oil, palm oil
  • Alcohols, purified water

Pharmaceutical industry

  • Solvents, alcohols, aqueous solutions
  • Slightly corrosive acids, alkalis
  • Chlorobenzene, chloroform
  • Vaccines, plasma


Technical data

Measurement principlesGuided radar
Level measurement typeContinuous measurement
Measured mediaLiquid/liquid interface, Liquids
Contact to measured mediumYes
Interface measurementYes
Probe diameter
  • Single rod Ø8 mm / 0.32"
  • Probe length0.6...4 m /
    1.97...13.12 ft
    Measuring range (liquids)0.6…4 m /
    1.97…13.12 ft
    Process pressure (relative)-1…40 barg /
    -14,5…580 psig
    Process temperature-50…+150°C /
    Wetted partsAustenitic stainless steel (1.4404/316L)
    Process sealsCeramic, Ethylene propylene diene monomer (EPDM), Fluorocarbon-based synthetic rubber (FKM/FPM), Kalrez® 6221, PEEK, Polytetrafluoroethylene (PTFE)
    Accuracy (liquids)±2 mm /


    Certificates/Approvals ExATEX, cQPSus, IECEx, INMETRO, NEPSI
    Certificates/Approvals SafetySIL2
    Certificates/Approvals HygienicEC 1935/2004, EHEDG, FDA
    Ingress protectionIP66/68, NEMA4X/6P


    Digital outputsHART®
    Discrete outputsRelay
    Analogue outputs4…20 mA

    Process connections

    Hygienic connectionsDairy screw (DIN 11851): DN25, DN40, DN50
    SMS (1145): 38 mm, 51 mm
    Clamp (DIN 32676): DN25, DN40, DN50
    Clamp (ISO 2852): 25, 38, 51
    Tri-Clamp®: 1", 112", 2"