Rain Bird FS100B 1" Brass Tee Flow Sensor - FS100B
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.
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.
Features
- 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: 3β35 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" β suitable for inline tee installations.
What our Experts Think
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Premium brass construction for maximum durability β Built for long-term performance in demanding irrigation environments where strength and corrosion resistance matter.
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Accurate flow monitoring for system protection β Helps detect leaks, pipe breaks, and abnormal water usage to reduce waste and prevent landscape damage.
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Reliable impeller-based sensing technology β Provides stable and consistent readings across a wide range of operating flow conditions.
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Ideal for commercial irrigation systems β Well-suited for sports fields, golf courses, and large landscape installations requiring precise water management.
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Supports smart controller integration β Works with Rain Bird advanced control platforms for automated shutoff and flow-based diagnostics.
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Brass tee design for secure installation β Ensures a robust, leak-resistant fit in 1" irrigation pipelines.
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Long service life with low maintenance needs β Durable materials and proven sensor design reduce upkeep and improve system uptime.
Q&A
Q: What is the Rain Bird FS100B used for?
A: It is a 1" brass tee flow sensor designed to measure irrigation water flow for monitoring, leak detection, and system efficiency control.
Q: What pipe size is the FS100B compatible with?
A: It is designed for 1-inch irrigation pipelines using a brass tee configuration.
Q: What material is the FS100B made of?
A: Durable brass construction for high strength, corrosion resistance, and long service life.
Q: How does the FS100B measure flow?
A: It uses an internal turbine/impeller that generates pulse signals proportional to water flow rate.
Q: Is it compatible with Rain Bird controllers?
A: Yes, it works with Rain Bird controllers that support flow sensing, including commercial irrigation systems.
Q: Can it help detect leaks or pipe breaks?
A: Yes, it enables flow monitoring to identify abnormal water usage, leaks, or system failures.
Q: Is it suitable for outdoor irrigation use?
A: Yes, it is built for durable underground and outdoor irrigation installations.
Maintenance Tips
- Rain Bird FS100B (1" Brass Tee Flow Sensor)
- Inline 1" brass tee-style flow sensor for commercial irrigation mainlines
- Uses a six-blade impeller (paddle wheel) to generate pulse signals for flow measurementΒ
- Designed for accurate flow monitoring, leak detection, and zone diagnostics
- Provides data for Rain Bird controller features like:
- Flo-Watch (automatic leak shutdown)
- Learned Flow calibration
- FloManager irrigation optimization
- Built with a durable brass tee body for high-pressure, outdoor/underground use
- Typically used in commercial systems (golf courses, sports fields, parks, campuses)
- Compatible with Rain Bird ESP-LXD, ESP-LXMEF, ESP-LX series, and IQ central control systems
- Operating range generally suited for low-to-medium irrigation flow zones (commonly ~3β35 GPM depending on system design)
- Installed directly in-line on 1" mainline piping for continuous flow monitoring
- Purpose: enables real-time system protection, water tracking, and irrigation efficiency control
Damage 
Loss 
Theft 
