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Rain Bird FG100 flow sensor front view showing 1-inch NPT threaded union, plastic body and paddle-wheel housing, wired connection.

Rain Bird FG100 Flow Sensor - 1 in. NPT, Wired Leak Detection

Brand: Rain Bird
Save 27%
$193.10
$140.00
SKU FG100
In Stock (12)

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Protect landscapes and property with the Rain Bird FG100 Flow Sensor — a wired, in-line flow sensor engineered for residential and light-commercial irrigation systems. The FG100 detects abnormal flow quickly so leaks, broken lines, or stuck irrigation heads are identified and addressed before they cause costly damage.

  • Reliable flow monitoring: Paddle-wheel impeller with ceramic shaft provides consistent readings and long service life.
  • Wide operating range: Minimum flow 3 GPM; recommended up to 25 GPM; absolute maximum 35 GPM for short durations.
  • Simple wiring: Compatible with standard 18g irrigation wire; 500' / 152.4 m range on unshielded 18g wire (use shielded cable for longer runs or high-interference sites).
  • Multiple connection options: Available with 1" NPT, slip or BSP unions for fast installation and easy maintenance.
  • Weather-ready: Plastic body and winterizable design allow in-ground installation year-round with proper line blowout.
  • Compact dimensions: 9.25" L × 3.31" H × 2.56" W; 1" / 25.4 mm inlet/outlet.
  • Smart integration: Pairs with Rain Bird ESP-ME3 controllers; add an LNK2 Wi‑Fi module to enable app-based monitoring and advanced flow settings.

Designed for fast installs and dependable monitoring, the FG100 helps irrigation professionals and homeowners reduce water waste and protect landscapes. Use the FG100 with an ESP-ME3 controller and LNK2 for learned-flow protection, station-level alerts, and remote system visibility.

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Frequently Asked Questions

What flow range does the FG100 support?
Minimum flow is 3 GPM. Recommended maximum is 25 GPM; absolute maximum is 35 GPM for short periods.
How is the FG100 installed and what connections are available?
Installs inline (no straight pipe required) after the master valve; available with 1" NPT, slip or BSP unions for fast installation.
Will the FG100 work with ESP-ME3 and the Rain Bird app?
Yes. FG100 pairs with ESP-ME3 controllers. Add LNK2 Wi‑Fi to enable remote monitoring and advanced flow settings in the app.
Can the FG100 remain in the ground during winter?
Yes. The FG100 is winterizable and designed for in-ground use when lines are blown out; no special PE cable is required for typical installs.

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