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ELF Series Flow Sensor 


The Enhanced Low Flow (ELF) sensor from Creative Sensor Technology measures rate of flow in small diameter closed pipe irrigation systems. 

This innovative new design, issued US patent no. 10060774 B1 in 2018, allows this sensor to measure flow rates over a range from .20 to 20 GPM using the proven impeller technology of the other CST flow sensors. 


ELF sensors are available in two sizes, a ¾ inch PVC sensor with socket type connections and a 1 inch sensor with male pipe thread connections


The standard sensor output is a digital pulse proportional to flow. The electrical characteristics of the output signal duplicate other two wire digital outputs making this “frequency” output signal compatible with most manufacturer’s “smart” irrigation controller products. The pulse signal will travel up to 2,000 feet without amplification.

This new design eliminates the need for straight pipe sections up and downstream of the sensor allowing for installation in tighter spaces. In fact, solenoid valves may be connected directly to the downstream end of threaded ELF versions resulting in a flow sensor/master valve combination less than 12 inches long. 

Designed for the harsh environment of irrigation service, Creative Sensor Technology now warranties all of its sensor electronics with a lifetime replacement guarantee. 

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ELF SP3 Series PVC Flow Sensor


ELF Series flow sensors are also available with a scaled pulse output.  Designated as SP3 models, the three wire versions have scaled pulse output signals, 1 pulse = 1 gallon for the 1 inch model and 1 pulse = 0.10 gallon for the ¾ inch version making them ideal for use with all Hunter Hydrawise controller models.

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Advantages of ELF flow sensors over water meters: 

• Measures a much wider range of flows           

• Operates without pressure loss 

• Higher pressure rating - 240 psi 

• Easy to install, no special fittings required 

• Simple to clean or service


• Flow measurement range

   - ¾ “ T75 version 0.20 to 10 gpm

   - 1” T10 version 0.20 to 20 gpm

• 240 psi working pressure rating

• LED indicator on sensor

• Friction loss at full flow averages 0.20 psi


ELF models, like all CST sensors, are backed by our lifetime electronics warranty.

Data Sheet
Installation Guide
Installation Guide SP3 Series
Installation Detail –
ELF Series Flow Sensor & Master Valve Assembly Installation
ELF Series Flow Sensor & Master Valve Assembly Installation
ELF Series Flow Sensor Installation
ELF Series Flow Sensor Installation
ELF Announcement
ELF SP3 Announcement
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