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Fluxicont FU4SK / FU4LK

Fluxicont FU4SK / FU4LK

Flow transmitter / flow switch for general industrial and for hygienic and aseptic applications


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  • Flow velocities from 3cm/s to 300cm/s
  • Wide variety of process connections  and sensor lengths
  • Wear-free calorimetric sensor
  • Process temperature range –20°C to +110°C
  • FU4LK: Useable for CIP/SIP cleaning
  • FU4LK: Elastomer-free and free of dead space metallic sealing connection
  • High process pressure tightness up to 40bar
  • Fully welded robust steel enclosure
  • High protection class IP69K/IP67
  • Evaluation electronic RS485 Modbus®-RTU / IO-Link®

FU4SK suitable for general applications in

  • Machinery and plant engineering
  • Air-conditioning and refrigeration plant engineering
  • Hydraulic and pneumatic systems
  • Process industry
  • Environmental technology

FU4LK suitable for general applications in

  • Food and beverage industry
  • Pharmaceutical industry
  • Biotechnology
  • Sterile process engineering\

The device is an electronic flow resp. temperature switch for monitoring, control and continuous measurement of flow and temperatures in liquids.

A high variety of versions of process connections and electronic types allows the use for a wide range of applications, also for demanding measuring requirements.

The process connection of the FU4LK with metallic sealing has been specifically designed for the hygienic, dead-space and elastomer-free process adaption.

Due to its high accuracy and the digital adjustability by RS485 Modbus®-RTU or IO-Link® the device can be suited to a wide variety of applications.

The robust design and the high-quality workmanship turns the device into a very high quality product, which even the most adverse environmental conditions cannot affect, whether the lowest temperatures when used outdoors, extreme shock and vibration stress or aggressive media.

A captive laser marking of the type label ensures the identifiability throughout the entire lifetime of the device.

Obviously is the optional marking of a measurement point designation resp. TAG, a customer label or of a neutral type label, of course also per laser marking.

A LABS- resp. silicone-free version, a factory calibration with calibration certificate and a customer specific configuration resp. preset is also optionally available like a material test certificate EN10204 3.1 or a factory certifications for drink water resp. food suitability.

Customer specific special versions can be realized short-term on request, e.g. special designs for the process connection or other process materials.

Technichal data

Measuring range
Measuring principle Calorimetric flow measurement
Nominal measuring range 3…300 cm/s

Output type V – RS485 Modbus®-RTU
Interface RS485, bidirectional / Modbus®-RTU / 9600 Baud (4800…38400 Baud)
Time behavior Flow: T90 ≤ 6s / ton ≤ 10s
Temperature: T90 ≤ 4s / ton ≤ 2s

Output type L – IO-Link®
Interface IO-Link® V1.1 / Com2 (38400 Baud)
Analogue output 0…20mA: 0…20,5mA / ≤ 0,05mA / ≤ 22mA / dI ≤ 1µA
4…20mA: 3,8…20,5mA / ≥ 3,6mA / ≤ 22mA / dI ≤ 1µA
Switch output 2x PP (Push-Pull), switch to +L/-L
Output Uout ≤ 0,2V, ≥ Us – 2V / Iout 0…200mA (current limited ≤ 450mA, short circuit protected)
Time behavior Flow: T90 ≤ 6s / ton ≤ 10s
Temperature: T90 ≤ 4s / ton ≤ 2s

Auxiliary power Supply voltage Us polarity protected Type V – RS485 Modbus®-RTU: 6…35VDC
Type L – IO-Link®: 9…35VDC, without IO-Link® / 18…30VDC, with IO-Link®

Measuring accuracy Accuracy Flow: ≤ ±5% Measuring end value (5…100cm/s) / (-20°C…+85°C) / ≤ ±10% Measuring end value (100…175cm/s) / (-20°C…+85°C)
Temperature: ≤ ±1,5K (≥ 20cm/s)
Long term drift Flow: ≤ ±10% of measuring value / year (-20°C…+85°C)
Temperature deviation Flow: ≤ ±0,4cm/s / K (-20°C…+85°C)

Process conditions
Process temperature -20°C...+110°C, +140°C/1h
Process pressure ≤ 40 bar

Environmental conditions
Environmental temperature -20°C...+100°C
Protection level IP69K/IP67 (EN/IEC 60529)
MTTF 463 years