Industrietechnik SF3E Liquid Flow Switch | Brass | Low Flow Detection | R1/2” Tee Mount | IP65

Compact Flow Monitoring for Precision Low-Flow Applications

The SF3E by Industrietechnik is a compact electromechanical liquid flow switch designed for precise low-flow detection in small-diameter piping systems. Tailored for HVAC, refrigeration, and heat pump applications, the SF3E excels where traditional flow sensors may be too large or insensitive to detect minimal flow rates.

With a setpoint range of just 0.174 to 0.846 m³/h, the SF3E is ideal for verifying flow in return lines, auxiliary loops, and low-volume circuits. Constructed from brass and mounted via an R1/2” Tee fitting, it combines accuracy, space-efficiency, and ease of installation.

Protected with an IP65-rated housing and transparent PC cover, the SF3E ensures reliable operation in humid or dusty environments. It is CE compliant and built for consistent performance in tight or sensitive installation zones.

Key Features

• Electromechanical paddle-type switch for liquid flow detection
• Low Setpoint Range: 0.174 to 0.846 m³/h
• Contact Rating: 15 (8) A at 24–250 VAC
• Brass Construction: Suitable for standard water-based media
• Pipe Fitting: R1/2” threaded Tee fitting
• Compact Size: 140 × 62 × 65 mm
• Pressure Rating: Up to 1100 kPa
• Environmental Tolerance:
  • Ambient Temp: -40°C to +85°C
  • Humidity: 10–90% RH (non-condensing)
• IP65 Protection: Transparent PC cover, ABS base
• CE Compliant | Class I Appliance

Applications

• Low-volume HVAC loops (fan coil returns, condensate loops)
• Refrigeration return lines or auxiliary coolant verification
• Compact heat pump systems with minimal flow circulation
• Precision pump monitoring in commercial automation setups
• Water flow assurance in test benches or equipment cooling systems
• Industrial skids where small-diameter pipe flow must be validated
• Safety cutout or alarm activation for low-flow thresholds

Downloads:

• Datasheet