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Looking for a robust, corrosion-proof sensor for liquid flow monitoring? The ST 421 K-F is the perfect fit. With a G1/2 screw-in connection, PTFE construction, and IP68 protection, it ensures reliable performance even in demanding environments.

Key Features:

• Corrosion-resistant PTFE housing

• Immersion depth: 48 mm

• 2 m fixed FEP cable (4x0.25 mm²)

• Ιnstallation: T-piece connector or welding sleeve

• Requires amplifier with analog or switching output

Performance Data:

• Medium: Water, Oil

• Detection Range:
  Water: 1 … 70 cm/s
  Oil: 2 … 100 cm/s

• Ambient & Medium Temperature: -10 … +70 °C

• Start-up Time: typ. 60 s (range: 40–100 s)

• Reaction Time: typ. 30 s (range: 10–50 s)

• Compressive Strength: 5 bar

• Protection Class: IP68 (EN 60529)

• Sensor Material (wetted parts): PTFE

• Housing Material: PTFE, PVDF

• Accessories: 2x G1/2 AFM 34 gaskets (included)

Compatible Amplifiers:

• SKM 420 GR, SKM 420 GSP, SKM 420 GA

• SKM 522 GR, SKM 522 WR

• SKZ 400 GR, SKZ 400 WR-115, SKZ 400 WR

📌 Note: Versions with longer cable available on request.