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Hunter Flow Meter and Wireless Integration for Smart Irrigation Controls
Quick Answer: Hunter flow meters paired with wireless modules give irrigation engineers real time flow data without running cable. In industrial scale projects or when pipe size goes beyond DN80, Silver Instruments magnetic and ultrasonic meters become the logical next step because they handle larger line sizes, recycled water, and fertilizer slurries with no moving parts.
Why Hunter Owners and Designers Add Flow Monitoring
Hunter controllers like the ACC2 and Hydrawise platform already support a pulse output flow sensor. The HC flow meter, a plastic bodied impeller type, works on pipe sizes from DN20 up to DN50. Installers in Australia and Southeast Asia use it on residential estates, sports fields, and small golf courses. The common goal is simple. They want to track water usage by zone and catch a broken lateral line before the turf dies.
But here is the thing. Once a project grows to pump stations with DN100 or DN150 steel pipe, or an EPC firm is reusing treated effluent, the plastic Hunter meter no longer fits mechanically or chemically. We see this on customer sites many times. A landscape contractor in Malaysia called us last year because his DN125 main line needed a flow meter with 4-20 mA output to feed into a Torro Sentinel controller. He had tried a small Hunter type before. Impeller broke after four months because of suspended solids. That is exactly where industrial meters come in.
What Wireless Integration Looks Like on a Site
Hunter’s Hydrawise uses WiFi or an HCC controller with LTE for cloud access. The flow meter sends a pulse per gallon to a sensor input on the controller. No separate transmitter, no analog loop. That works fine on a wired sensor at a valve box within 30 meters of the controller. For a large agricultural pivot or a municipal park spread over 15 hectares, a wireless shot is necessary. Usually the contractor adds a third party radio link like a Campbell Scientific RF module or even LoRaWAN bridge powered by a small solar panel and battery. The flow signal is then received at the pump house and converted back to a pulse or 4-20 mA.
In those setups, Silver Instruments often supplies the flow primary. An electromagnetic flow meter without moving parts connects to a wireless RTU over a 4-20 mA HART loop. Because the meter itself has no impeller, it does not care about grit or algae. That was the case for a park irrigation system in Johannesburg where we provided a DN80 magmeter with integral display and pulse output, transmitting data over a 2.4 GHz link to a central Hunter controller 800 meters away. The maintenance team only cleans electrodes once every two years.
When Pipe Sizes and Fluids Push Past Plastic Meters
For clean water in a small greenhouse, a Hunter HC flow meter is enough. Once the application involves liquid fertilizer injection, high salinity bore water, or DN100 and above, the design engineer typically specifies an industrial flow meter with a 316L stainless steel or PTFE liner. Our experience in Thailand reinforces this. A fertigation system for a dragon fruit farm used a Hunter meter on the fresh water line but needed a magnetic flow meter on the blended fertilizer line because the pH dropped to 4.5. The plastic housing on the impeller meter would have developed micro cracks over time. In practice, a rubber lined magmeter with titanium electrodes survived three seasons without a single alarm.
We also see ultrasonic clamp on meters used as a retrofit on large steel pipes where cutting into the line would shut down irrigation for days. A date palm farm in Oman added a clamp on ultrasonic meter on a DN200 line and fed the 4-20 mA signal into a wireless node. The data ended up on an ACC2 controller through a pulse converter. The reading was as stable as an inline magnetic meter because the pipe was always full and fluid temperature did not vary more than 5 degrees Celsius.
Matching Output Signals to Hunter Controllers and Third Party Wireless Nodes
Most Hunter controllers accept a dry contact or open collector pulse from a flow sensor. The pulse scaling for the HC flow meter is typically 1 pulse per gallon, but you can recalibrate. An industrial magnetic or vortex flow meter from Silver Instruments can output a configurable pulse per unit volume. Engineers can set a pulse per litre, per 10 litres, or per cubic metre to match the controller scaling. When a wireless transmitter sits between meter and controller, the pulse width must exceed the minimum detection time of the Hunter input. We usually recommend a pulse width of 50 milliseconds minimum and frequency not above 100 Hz. Doing this avoids missed pulses on a solar powered remote station.
On larger sites where SCADA is present, the flow meter often outputs Modbus RTU via RS485. A wireless serial server can then push flow rate and totalizer data directly to the S
Real Failures That Engineers Skip (Until They Happen)
Most engineers skip this part during specification. If the irrigation line does not stay full, a magnetic flow meter will read zero because its electrode needs a continuous liquid column. A horizontal installation with a slight upward slope is ideal. For partially full pipes, an ultrasonic Doppler type works better, but it needs sufficient suspended solids to reflect the signal. We learned this lesson on a farm in Australia where an inline magmeter was installed with a downhill discharge pipe that siphons air back every time the pump stops. The meter lost signal every morning until they added a check valve and relocated the sensor downstream of a constant head tank.
Another common oversight is grounding. Plastic pipes like PVC or HDPE do not provide an electrical ground for electromagnetic flow meters. Installers must add grounding rings or use a meter with a built in reference electrode. A customer in the Philippines skipped this and got erratic readings during a lightning storm because the grounding wire was not bonded to a proper earth rod. After installing a stainless steel grounding ring on each flange, the fluctuation disappeared.
How to Choose Between a Propeller Meter and an Industrial Meter for Irrigation
Propeller meters like Hunter and other irrigation specific brands work for clean water below DN80 where the line is accessible for periodic cleaning. When the water source is a river, open reservoir, or recycled waste with TSS above 30 mg/L, the cost of cleaning and replacing impellers quickly exceeds the price gap of an industrial magmeter with no moving parts. A food grade oil producer in Malaysia used a vortex flow meter with no bearings for their irrigation booster pump because propylene glycol mixes were too viscous for a small paddle wheel. The vortex meter worked without drift for two years before the first calibration check.
So the decision often comes down to three factors: pipe size, water quality, and need for wireless transmission. For DN20 to DN50 clean water and a Hydrawise controller within wire reach, a Hunter flow sensor is hard to beat on price. For anything larger, dirtier, or requiring a 4-20 mA loop for a long range wireless system, Silver Instruments meters are the choice we see across over 40 countries.
Contact Silver Instruments for a Cross Reference or Quote
If you are designing an irrigation system with Hunter controllers but the pipe size exceeds DN80, or if the water is aggressive, send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range. We will recommend a magnetic, ultrasonic, or vortex flow meter with the correct output for your wireless integration.
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Frequently Asked Questions
Do Hunter flow meters work with any wireless system? They output a dry contact pulse. You can connect that pulse output to most radio telemetry units as long as the pulse width and frequency match. Test the signal with 50 ms minimum pulse width and keep frequency under 100 Hz for a reliable link.
Can I use a Silver Instruments magnetic flow meter with a Hunter Hydrawise controller? Yes. You set the meter to output a configurable pulse per unit volume and wire it to the sensor input on the Hydrawise compatible controller. Many sites do exactly this when pipe size is DN80 or larger.
What is the price difference between a Hunter HC flow sensor and an industrial magmeter? A Hunter HC sensor for DN25 retails under 100 USD. An industrial magnetic flow meter for DN100 typically starts around 750 USD. The cost trade off is driven by maintenance and downtime, not the initial purchase price alone. A magmeter with a PTFE liner handles abrasive flow with zero impeller replacements for years.
Does a magnetic flow meter work on partially filled irrigation pipes? No. The electrode pair must be submerged. If the line is not always full, consider an ultrasonic Doppler flow meter, but bear in mind it needs suspended solids to reflect sound properly.
How do I order a wireless ready flow meter from Silver Instruments? Send us your pipe size, water quality data, controller input specification, and required output signal. We assemble the correct meter model, liner material, and output board so you receive a complete unit ready to wire to your radio modem or controller.