Rain Bird FS100B 1" Brass Tee Flow Sensor

The Rain Bird FS100B is a 1" brass tee flow sensor engineered for reliable irrigation flow monitoring. Built for compatibility with Rain Bird pulse transmitters and central controllers, the FS100B provides consistent pulse output and durable construction for long service life.

• 1" inlet/outlet: NPT or BSP threads for threaded installations or slip-fit when specified.
• Brass tee body for corrosion resistance in outdoor irrigation systems.
• Paddle-wheel rotor with ceramic shaft for accurate measurement and heat dissipation.
• Flow range: 3–35 GPM (recommended operating range up to 25 GPM for optimal accuracy).
• Pulse output compatible with PT3002 / PT322 transmitters and most irrigation controllers.
• Compact dimensions: approx. 5.45" x 4.94" x 2.21" — suitable for inline tee installations.

Install the FS100B in a tee within the mainline to detect leaks, broken heads, or abnormal flow conditions and send alerts to your controller. For long cable runs (over 500' / 152 m) or areas with electrical interference, use shielded cable. The sensor is designed for outdoor or buried use when properly installed; follow Rain Bird transmitter wiring and k-factor charts for calibration. Review the included tech spec and installation guide before beginning.