Netafim IRT 4 in Water Meter, Flanged, Reed Switch 10 Gallons per Pulse (36IRT4F)

Netafim IRT 4 Inch Water Meter for High-Flow Farm Mains

Large blocks fed from a well, reservoir or district canal move several hundred gallons a minute through one pipe. Measuring that flow is how a grower proves water use, catches leaks and sets fertigation by volume. The Netafim 'IRT' in 4 in, item 70261-009500 and model 36IRT4F, is made for that duty on moderate to dirty water. Water is metered by a paddle wheel mounted at the top of the passage, so the space below stays open for debris. Low head loss comes from that free passage, which matters on a main that is already pressure-limited. Accuracy is ±2% from 50 GPM to a 688 GPM maximum, with 500 GPM as the nominal flow. From 30 GPM upward it still reads within ±5%. The flanged body is polyester-coated cast iron, rated to 230 psi with liquids up to 140°F. Continuous flushing of the bearings in service keeps grit from settling where it would cause wear. A reed switch in the sealed, stainless steel encapsulated register sends one pulse per 10 gallons.

Plumbing and Wiring Netafim Irrigation Meters on a 4 in Line

Netafim irrigation meters such as this one need a clean, full pipe and a calm flow profile. Leave ten diameters of straight pipe upstream and five downstream, or 40 in and 20 in on this size. Together with the 10 in meter body, plan for roughly 70 in of straight run. Any mounting position works, with flow running upward on any non-horizontal section. Flush the line before installation, and fit correctly sized continuous acting air vents so air never reaches the paddle wheel. Run the reed switch cable to a controller or logger pulse input, where each pulse adds ten gallons to the running total. At a pipe velocity of 5 ft/s, flow on this size is about 195 GPM. Service is simple because the measuring unit is calibrated and field replaceable, and the body stays in the line. A tamper proof seal protects the register against removal. The body weighs about 50 lb, and the warranty covers metering components for three years and the body for five.

Key Features

• Paddle wheel at the top: Leaves a free passage so sand and debris pass without clogging.
• Low head loss: Open water path keeps pressure available on a busy main.
• ±2% accuracy: Holds from 50 GPM to the 688 GPM maximum.
• Reed switch register: One dry-contact pulse per 10 gallons into a controller or logger.
• Flushed bearings: Stay clear of deposits in dirty water service.
• Field replaceable measuring unit: Calibrated insert swaps out with the body left in place.
• Tamper proof seal: Guards the register against unauthorized removal.

Technical Specifications