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Arag Flow Meter Wiring Diagram for Agricultural Boom Sprayer Wolf Sensors
Quick Answer: Most Arag flow meters on agricultural boom sprayers use a three wire Hall effect pulse signal. The typical wiring is 12 V DC power, ground, and a square wave signal that the sprayer controller counts. If you replace an Arag or Wolf sensor with a Silver Instruments pulse flow meter, match the K factor in the controller and check the supply voltage before first run.
Here is the thing. Many sprayer operators search for an Arag flow meter wiring diagram when the rate controller shows zero flow or the reading jumps. Wolf Sensors often appear on the same harness because some sprayer builders mix components across brands. You need a clear map of power, ground, and pulse output before you touch the loom. This guide gives you that map without fluff.
Typical Arag Flow Meter Wiring on a Boom Sprayer
Arag flow meters used on agricultural boom sprayers usually have three wires. The brown wire connects to 12 V DC switched from the sprayer console. The blue wire is ground. The black wire carries the pulse signal to the rate controller input. Some models use a fourth wire for shield or diagnostic output but the three wire version covers most field installations.
In practice the wire colors can vary if the harness was built by a small sprayer OEM. Always verify voltage at the connector before you crimp a new terminal. A reading of 11.8 V to 13.5 V at the sensor is normal. A voltage below 10 V causes weak pulses and the controller may read zero flow at 80 L/min.
Signal Output and Controller Input
The Arag flow meter sends a square wave pulse to the sprayer controller. The frequency rises with flow rate. A typical K factor for a 20 mm bore Arag style flow meter is about 460 pulses per litre. Smaller DN15 body sensors may output 1000 pulses per litre or more. Check the label on the turbine body. The K factor is often printed there.
Wolf Sensors and other agricultural flow meters often use the same open collector pulse output. That means the controller input provides a pull up voltage. Some controllers expect 5 V logic, others accept 8 V to 12 V pulses. If you connect a Silver Instruments turbine flow meter with a hall sensor output, confirm the controller input type in the setup menu. Most rate controllers from Arag, TeeJet, Raven, and Muller accept a similar pulse shape.
Common Wiring Problems in the Field
We have seen this on customer sites many times. A sprayer works for two seasons then the flow meter reading becomes unstable. The first check is the ground wire. A corroded ring terminal on the boom frame causes a voltage offset. The controller counts extra pulses or drops pulses. Run a clean ground wire back to the battery negative bus. Do not ground the flow meter through the boom pivot. The resistance changes when the boom folds.
Another common issue is water inside the connector. A sprayer parked outside in Queensland or northern Nigeria collects condensation. The pulse signal shorts to ground. You can pack the connector with dielectric grease after each season. We also recommend heat shrink with adhesive lining on the sensor tail. That costs less than one hour of field downtime.
Silver Instruments Replacement Flow Meters
Silver Instruments supplies a compact turbine flow meter with a pulse output that works with Arag and Wolf style rate controllers. The body is 316L stainless steel. The rotor is PVDF. The thread is 1 inch BSP male or 3/4 inch BSP male. Flow range is 5 to 100 L/min for boom sprayer duty. Accuracy is 1.0 percent of reading fr
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For liquid fertilizer or acid spray mix, an electromagnetic flow meter is a better fit. The Silver Instruments electromagnetic flow meter for DN15 or DN20 pipe has no moving parts. It outputs 4-20 mA, pulse, and RS485 Modbus. Power supply is 24 V DC or 220 V AC. The liner material is PTFE or PFA. Electrodes are Hastelloy C. Minimum conductivity is 5 µS/cm. This meter handles 2 bar to 16 bar working pressure and 0.5 percent accuracy. Many chemical sprayer builders in Southeast Asia and Latin America use this type for difficult liquids.
Last year a customer in Vietnam replaced a Wolf sensor on a 24 metre boom sprayer. The old meter was dead. The harness supplied 12 V DC. He fitted a Silver Instruments turbine meter with a 1 inch BSP thread. The controller K factor was set to 460 pulses per litre. The sprayer passed calibration on the first run. We have repeated this for a vegetable farm in Queensland and a coffee plantation in Brazil.
How to Specify a Flow Meter for a Boom Sprayer
Send us the flow range in L/min, the working pressure in bar, the liquid type, the pipe or thread size, and the controller pulse input voltage. You can call us at +86-135-1213-1526 or message us on WhatsApp at 86-135-12131526. We have supplied replacement flow meters for sprayer OEMs in Vietnam, Indonesia, Mexico, Kenya, and Saudi Arabia. Tell us the controller brand and the current K factor. We will check compatibility before you order.
Frequently Asked Questions
What wiring colors are used on an Arag flow meter?
Most Arag flow meters use brown for 12 V DC, blue for ground, and black for pulse signal. Always check the tag or measure voltage first. Some Wolf Sensors harnesses use the same colors but a different pin order.
Can I connect a Silver Instruments flow meter to a Wolf sensor harness?
Yes in most cases. Both use square wave pulse output. You need to match the K factor in the controller and verify the supply voltage. If the harness provides 5 V DC and our meter needs 8 to 24 V DC, add a small voltage converter or use a different power source.
Why does my boom sprayer show zero flow?
Check the supply voltage at the flow meter connector first. Then check for a broken ground. Then spin the rotor by hand with the controller on and watch for pulses. If you see no pulse, the sensor may be dead. A replacement turbine flow meter from Silver Instruments costs less than a field service call from a sprayer dealer.
What is the typical K factor for an agricultural sprayer flow meter?
The K factor depends on the body size and rotor design. A DN15 or 3/4 inch turbine flow meter often has a K factor near 1000 pulses per litre. A DN20 or 1 inch model may be near 460 pulses per litre. Always use the value on the calibration sheet for the exact meter you install.
Does a flow meter for boom sprayer need a display?
No. The rate controller displays flow and total volume. The flow meter itself can be blind. This keeps the cost down and reduces failure points. If you want a local display for calibration, Silver Instruments offers a version with a small pulse output only or with a local LCD.
Need a replacement flow meter or a technical check before wiring? Call +86-135-1213-1526 or WhatsApp 86-135-12131526. You can also reach us on WeChat at +86 13512131526. Visit flow-meter.com.au for the full flow meter catalogue. We respond to field questions from agricultural sprayer OEMs and end users across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.