Industrietechnik SF4E Liquid Flow Switch | Brass | Low Flow Detection | R3/4” Tee Mount | IP65

Precision Low-Flow Detection for Compact HVAC and Process Piping

The SF4E by Industrietechnik is a low-flow electromechanical liquid flow switch tailored for small-to-medium pipe applications where accuracy and reliability are critical. Designed for heating and cooling systems, refrigeration units, and industrial loops, the SF4E features a brass body and an R3/4” Tee fitting to fit snugly into tight installations.

With a setpoint range of 0.138 to 0.768 m³/h, the SF4E is ideal for detecting minimal flow in systems requiring precise verification—such as return lines, fan coil loops, and chemical dosing setups. The IP65-rated enclosure, CE compliance, and high contact rating ensure dependable operation even in harsh environments.

Key Features

• Electromechanical paddle-based flow switch
• Brass Construction: Ideal for non-aggressive liquid media
• Low Setpoint Range: 0.138 to 0.768 m³/h
• Max Pressure Rating: 1100 kPa
• Threaded R3/4" Tee Fitting for easy pipe integration
• Contact Rating: 15 (8) A @ 24–250 VAC
• Environmental Durability:
  • Temperature: -40°C to +85°C
  • Humidity: 10–90% RH (non-condensing)
• Compact Dimensions: 140 × 62 × 65 mm
• IP65 Protection: With transparent PC cover and ABS base
• Class I Appliance | CE Certified

Applications

• HVAC systems: Monitoring low-flow in return lines or fan coil units
• Refrigeration: Verifying flow in small-volume evaporators or chillers
• Compact water circuits: In heat exchangers and auxiliary cooling systems
• Pump dry-run protection in small-scale systems
• Chemical dosing systems: Detecting carrier fluid flow
• Building automation: Validating low-level flow in tight spaces
• Energy-efficient systems: Ensuring minimal flow thresholds are met

Downloads:

• Datasheet