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Arag Flow Meter Agricultural Boom Sprayer Wolf Sensor Specifications and Silver Instruments Alternatives
Quick Answer: Silver Instruments supplies durable flow meters for agricultural sprayers that can directly replace Arag Wolf sensors. Our vortex and electromagnetic meters deliver 4-20 mA or pulse output and handle aggressive liquid fertilizers. To get a price quote, send us your chemical type, flow rate (L/min), pipe diameter (DN), and working pressure. We deliver fast to Australia, Thailand, Vietnam, Nigeria, and Mexico.
Understanding the Arag Wolf Sensor
The Arag Wolf sensor is a paddlewheel flow meter designed for agricultural boom sprayers. It measures water, herbicides, and liquid fertilizers. Most units output a frequency signal or NPN pulse. Flow ranges start at 0.3 L/min and go up to 30 L/min. The body is often polypropylene or PVDF. Maximum pressure is around 10 bar at 20 deg C. Accuracy is typically plus minus 2 percent of full scale. Inline connections use DN8 or DN15 threads with a Hall effect pickup.
Growers install the sensor between the pump and the boom sections. It helps the rate controller maintain consistent application per hectare. Arag sensors are common on trailed and self-propelled sprayers in Australia, Brazil, and South Africa. But spare part delays and high costs create downtime during the short spraying window.
Typical Specifications of the Arag Wolf Flow Sensor
Here are the numbers we see on customer sites. Flow range minimum 0.3 L/min, maximum 30 L/min. Output signal NPN open collector, or 4-20 mA loop powered at 12-24 VDC. Connection size 3/8 inch or 1/2 inch BSP. Wetted materials PP or PVDF with ceramic bearings. Maximum pressure 10 bar at 20 deg C. Ingress protection IP65 or IP67. Accuracy plus minus 2 percent full scale. Repeatability plus minus 0.5 percent.
Why Users Look for an Arag Flow Meter Alternative
Here is the thing. Original spare parts are expensive and lead time from Italy to Southeast Asia or Africa often exceeds six weeks. Many farmers cannot wait that long during spraying season. Aggressive chemicals such as acid-based fertilizers and wettable powders cause bearing wear and rotor seizure. Last year a pineapple plantation in the Philippines asked us for a metal-free vortex meter because their Wolf sensor rotor jammed after three months.
Most sprayer rate controllers accept a simple pulse or 4-20 mA input. That means you are not locked to a single sensor brand. You can choose a harder-working alternative and keep your sprayer running.
Silver Instruments Replacement Flow Meters for Boom Sprayers
Silver Automation Instruments offers two flow meter types that match or outperform the Wolf sensor. The first is the SVF-800 inline vortex flow meter. It has no moving parts. It resists wear from suspended solids and outputs a frequency pulse proportional to flow. You set the K-factor to match your sprayer controller.
The SVF-800 body uses 316L stainless steel with PTFE lining. It handles corrosive herbicides and organic solvents. It measures from 0.4 to 40 L/min in sizes DN10 up to DN20. Maximum pressure 16 bar. Temperature up to 120 deg C. Accuracy plus minus 1 percent of reading. That is a tighter specification than the paddlewheel sensor.
The second choice is our SEM-200 electromagnetic flow meter. It measures conductive liquids with no obstructions in the flow path. It is perfect for liquid fertilizers that contain salts. The SEM-200 provides 4-20 mA, pulse, and RS485 Modbus outputs. Liner is PTFE and electrodes are Hastelloy or 316L. Sizes range from DN6 to DN25. Pressure rating PN16. An integrated display shows instant flow and total. Enclosure rated IP67.
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How to Match the Signal to Your Sprayer Controller
Most sprayer controllers from Arag, TeeJet, Raven, or Mueller accept a frequency signal between 10 and 2000 Hz. Our vortex meter sends a square wave pulse directly. You adjust the K-factor value inside the controller menu. For controllers that need a 4-20 mA current loop, we supply a loop-powered converter. The electromagnetic meter already outputs 4-20 mA as standard. Wiring is straightforward: two wires for power, two wires for signal.
Because many end users worry about calibration, we pre-configure the meter to your flow range at no extra cost. Just share the minimum and maximum flow rate and the pipe size.
Important Considerations for Chemical Compatibility
Not all flow meters survive aggressive agrochemicals. Before you order, confirm the wetted material. For glyphosate and broadleaf herbicide mixtures, 316L stainless steel with PTFE works well. For high-acid foliar fertilizers, choose the electromagnetic meter with PTFE liner and Hastelloy electrodes. Avoid aluminum housings and Buna-N seals. In practice, we recommend you send the safety data sheet of your main chemical. Our engineers check compatibility and suggest the best sensor for your tank mix.
Pricing, Lead Time, and Support
We manufacture these flow meters in Nanjing, China. Typical lead time is three to five working days for standard models. Express shipping via DHL or FedEx takes five to seven days to Australia, and seven to ten days to Kenya or Ghana. The price starts near US$190 for a basic vortex meter in DN10. The electromagnetic meter starts at US$320 for a PTFE-lined version. Those figures are ex-works. We provide a formal quotation once you share your application parameters.
Send us your pressure (bar), temperature (deg C), pipe size (DN), and flow range (L/min). Reach Silver Automation Instruments at Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, or WeChat: +86 13512131526. Our team replies within 12 hours.
FAQ
1. Can the Silver flow meter directly replace an Arag Wolf sensor without changing the controller?
Yes. As long as your controller accepts a pulse or 4-20 mA input, you can wire our meter directly. We match the output signal and connector pinout if you provide the wiring diagram.
2. What flow range fits a 24-meter boom sprayer with 250 L/min total?
We recommend the SVF-800 vortex meter in DN20 with a range of 0.5 to 50 L/min per section. For total flow, use a meter on the main line. Our SEM-200 DN25 handles 250 L/min without restriction.
3. Are your meters suitable for liquid urea and ammonium nitrate (UAN)?
Yes. Use the electromagnetic flow meter with Hastelloy electrodes. UAN is conductive and corrosive. The PTFE liner resists attack. We have supplied meters to fertilizer blending plants in Nigeria for UAN measurement.
4. Do you offer calibration certificates or reports?
Every meter comes with a factory calibration certificate at no extra charge. The report lists test points and deviation. Third-party calibration can be arranged if the end customer requires it.
5. What are the shipping options for one or two units to Mexico?
We ship small orders via DHL or FedEx Express. Transit time is roughly seven days. Freight cost for two compact meters is near US$85 depending on weight. We handle the packing list and commercial invoice.
For further technical selection or to see our complete line of industrial flow meters, contact Silver Automation Instruments today.
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