Rain Bird FS350B Brass Insert Flow Sensor

Rain Bird FS350B Brass Insert Flow Sensor

Brand: Rain Bird | SKU: FS350B

Product Overview

Measure flow through a suitably prepared irrigation pipe with the Rain Bird FS350B brass insert sensor. It mounts through a compatible saddle or weld-on fitting using its 2-inch NPT adapter, placing the impeller inside the water stream. Unlike a tee-mounted sensor, the installation and calibration depend on the host pipe’s actual inside diameter and material.

Key Features

• Brass insert-style sensor for suitable 3-inch and larger pipe applications.
• Supplied with a 2-inch NPT mounting adapter.
• Removable impeller sensor assembly.
• Designed for outdoor or underground installations.

Common Uses

• Adding a measuring point to a suitable larger irrigation mainline with a saddle or weld-on fitting.
• Providing flow data to a compatible control system with pipe-specific calibration.

Technical Specifications

• Model: FS350B; factory part: M80105.
• Style: insertion flow sensor with brass sleeve and PPS sensor housing.
• Mounting connection: supplied nominal 2-inch NPT adapter for a suitable pipe saddle or weld-on fitting.
• Host-pipe selection: 3-inch and larger applications; confirm pipe material, inside diameter and the control system’s supported range.
• Sensing method: impeller; frequency output proportional to flow.
• Maximum line pressure: 400 psi; maximum liquid temperature: 220°F. Apply the manufacturer’s pressure/temperature limits.
• Manufacturer operating velocity range: 0.5–30 feet per second.
• K-factor, offset and suggested GPM range: selected for the actual pipe type and inside diameter.
• Signal leads: two 18 AWG conductors, 48 inches long.
• Straight pipe: at least 10 pipe diameters upstream and 5 downstream.
• Sensor and mounting adapter; pipe saddle or weld-on fitting, controller, interface and installation materials are separate.

Dimensions

• Manufacturer-listed sensor length: 7.13 inches.
• Manufacturer-listed diameter: 3 inches.

Compatibility & Installation Notes

Match the actual pipe material and inside diameter, the saddle or weld-on fitting, and the supported control-system configuration. The 2-inch NPT specification describes the mounting adapter, not the diameter of the mainline.

Shut off and depressurize the line before installation or removal. Select a straight run with at least 10 pipe diameters upstream and 5 downstream, and leave access above the insert for service.

Install and orient the fitting and sensor using Rain Bird’s insert-sensor procedure. Set insertion depth with the specified gauge method; do not estimate it from the outside pipe diameter. Keep the impeller and bearings clean.

Use the pipe-specific K-factor and offset rather than the fixed tee-sensor values. ESP-LXD uses the appropriate sensor decoder, currently SD211TURF in place of SD210TURF; ESP-LXMEF uses its Flow Smart Module. Other platforms need their specified interface.

The sensor reports flow. Any automatic alarm, learned-flow or shutoff action depends on the supported controller functions, configuration and valves.

Frequently Asked Questions

Is FS350B an inline 3-1/2-inch tee?

No. It is an insert sensor for suitable larger-pipe applications. Its supplied 2-inch NPT adapter mounts through a compatible pipe saddle or weld-on fitting.

Does one K-factor work for every pipe?

No. Select the K-factor and offset for the actual pipe material and inside diameter.

Is the pipe saddle included?

The sensor is supplied with its mounting adapter. Select the correctly sized saddle or weld-on fitting separately.

Can I remove it with the pipe under pressure?

No. Shut off and depressurize the line before installation or removal, following the manufacturer’s procedure.

Why Buy from Big Frog Supply?

Choose FS350B when a suitable larger mainline needs an insertion measuring point rather than a complete PVC tee assembly. Its brass sleeve and 2-inch NPT mounting adapter define the fitting arrangement, while the host pipe’s inside diameter determines calibration and the useful GPM range. Confirm the saddle, insertion access and controller setup together so the sensor is selected for the actual pipe, not just a nominal size label.