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Liquid Fertilizer Flow Meter: Agricultural Chemical Boom Sprayer Controls
Quick Answer: For injecting liquid fertilizer through a boom sprayer, Silver Instruments supplies compact electromagnetic flow meters in sizes DN15 and DN20. These meters send a 4-20 mA signal to your sprayer controller to keep application rates steady. They handle aggressive chemicals like UAN, calcium nitrate, or micronutrient mixes without clogging.
What You Gain with a Dedicated Fertilizer Meter
A standard sprayer flow meter often falls short with corrosive, salt-heavy liquids. Electrodes foul, bearings swell, and readings drift. That leads to over-application in some field zones and under-application in others. An electromagnetic flow meter removes those risks. No moving parts inside the pipe. A PTFE liner and Hastelloy C electrodes resist most fertilizer chemistries we see in the market. You get a stable 4-20 mA signal that your Raven, TeeJet, Topcon, or AgLeader display can read directly. Silver Instruments meters also show total volume on a local display, so the operator can cross-check the controller.
Installation That Makes Sense on a Sprayer
Mount the meter after the pump and before the boom sections. Most sprayer frames can accommodate a DN15 or DN20 spool piece. The meter body needs a short straight run, but five diameters upstream and three downstream are usually enough. We ship the meter with a factory-fitted grounding ring because fertiliser solutions have moderate conductivity. In practice, the grounding ring eliminates signal noise when the pump starts. A customer in Queensland, Australia, retrofitted two AGCO RoGator sprayers last season. He used our DN15 silver-line electromagnetic meter and connected it to a Raven SCS 460. Within a day he dialled in his UAN rate to within 1.5% deviation. He said the previous turbine meter would swing by 8% on hot afternoons.
Materials and Signal Details
The wetted parts are PTFE liner and Hastelloy C-276 electrodes. The housing is IP67 rated cast aluminium. Electrical connection is an M20 gland. The transmitter outputs 4-20 mA plus pulse and RS485 Modbus if you need data logging. Power supply is 24 V DC, which you can tap from the sprayer bus. For a new build, we can supply a meter with a local battery-powered totaliser as a backup. The flow range in DN15 is 0.2 to 300 L/min, which covers most boom widths up to 36 metres. The accuracy
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Integrating with Existing Controllers
Most sprayer controllers accept a frequency output or a 0 to 20 mA analogue input. Our meter offers both. Set the K-factor to 213 pulses per litre for DN15. Wire the signal cable to the console port labelled FLOW or FLOW METER. Silver Instruments provides a wiring diagram specific to Raven, Müller, Arag, and Hardi controllers. If your controller expects a voltage pulse, add a simple pull-up resistor. We have done this on customer sites many times, and a quick call to our support line resolves it in minutes.
FAQ
Which flow meter type is right for liquid fertiliser?
An electromagnetic flow meter with PTFE liner and Hastelloy electrodes works best. It handles corrosive liquids, gives a clean 4-20 mA signal, and needs almost no maintenance.
Can I use the same meter for water and fertiliser?
Yes. The meter measures water and fertiliser equally well. Just flush the lines after use to avoid salt deposits inside the liner.
What size meter do I need for a 24 metre boom?
A DN15 meter covers flow rates from 30 to 180 L/min, which fits most 24-metre spraying operations. If your total flow exceeds 300 L/min, we recommend DN20.
Do I need straight pipe upstream?
A short straight section of 5 pipe diameters upstream and 3 downstream is enough. Do not mount the meter directly behind a 90 degree elbow or a valve.
How do I get a price for a liquid fertiliser flow meter?
Send us your target flow range, fertiliser type, pipe size, and controller brand. Email [email protected] or call +86-135-1213-1526.
Get a Quote with Your Sprayer Specs
Give us the details that matter for your operation. Tell us the maximum flow rate in L/min, the fertiliser you use, your pipe diameter, and the sprayer controller model. Our team at Silver Automation Instruments will reply with a quoted part number, lead time, and shipping cost to your location. Reach us by Tel: +86-135-1213-1526, Whatsapp: 86-135-12131526, or WeChat: +86 13512131526. You can also review the product range at flow-meter.com.au. We ship to Australia, Southeast Asia, Africa, the Middle East, and Latin America weekly.
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