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Dura Flow Meter: Sourcing Heavy Duty Agricultural Chemical Spray Boom Sensors
Quick Answer: For agricultural spray booms, a heavy duty flow meter must handle aggressive chemicals, fine particles, pressure spikes, and constant field vibration. Silver Automation Instruments supplies oval gear and electromagnetic flow meters as direct replacements for many Dura style spray boom sensors. Send us your chemical type, flow range, pipe size, and operating pressure for a specific quote.
What a Dura Flow Meter Does on a Spray Boom
A Dura flow meter on a spray boom measures the liquid volume moving from the pump to the spray nozzles. This input lets the spray controller adjust ground speed or valve position to keep the application rate correct. Most spray rigs run a flow range from 2 to 60 L/min through DN15 or DN20 pipe. Working pressure is often 10 to 20 bar. Some systems use pulse output. Others need 4-20 mA. The meter body faces constant vibration from the boom frame and exposure to glyphosate, liquid urea, and trace solvents.
Common Failure Points We See in the Field
We have seen this on customer sites many times. A rice grower in Vietnam replaced three plastic turbine sensors in one season because fine urea particles wore down the rotor pins. A vegetable farm in Queensland had a pulse signal drop at low flow because the sensor was mounted too close to a pressure regulator. Another issue is chemical swelling of nylon bodies. Nylon absorbs water and some solvents. That changes internal clearances and causes drift. Most engineers skip this part, but wetted material selection matters more than brand name.
Heavy Duty Meter Options for Spray Booms
Silver Instruments offers two practical choices for spray boom duty. The SI-OG oval gear meter works best with clean to medium particle loads. Body options include PPS and 316 stainless steel. Gears can be PPS or 316 stainless steel. Seals are PTFE. Accuracy is 0.5 percent of reading from 2 to 60 L/min. Output options include NPN pulse, PNP pulse, and 4-20 mA. Maximum pressure is 20 bar. Fluid temperature range is 0 to 80 °C. Protection rating is IP67. For more abrasive mixes or field injection lines, we suggest the SI-EM electromagnetic flow meter. The SI-EM has no moving parts. It ha
Installation Notes for Spray Boom Sensors
Mount the meter on the pressure side of the pump. Keep at least 20 cm of straight pipe before the inlet. Install a 60 mesh Y strainer before an oval gear meter. For electromagnetic meters, avoid mounting near strong electric motors. Wire the pulse output with shielded cable to the spray controller. In practice, most signal failures on booms come from loose conduit or water entering the cable gland. Use IP67 glands and point them downward. This reduces moisture ingress on the connector pins.
How to Get a Quote from Silver Instruments
Tell us the chemical mix you run, the flow range in L/min or GPM, your pipe size in DN or inches, and the working pressure in bar. Also send a photo of your old Dura flow meter label if possible. That helps us match thread size and output wiring. You can reach Silver Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, or WeChat: +86 15365082610. We respond within 24 hours on working days.
FAQ
Can Silver Instruments replace a Dura flow meter on my sprayer?
Yes. We supply compatible oval gear and electromagnetic meters. Send photos of your old sensor face plate and thread size for a matching quote.
What flow range is typical for agricultural spray booms?
Most small and medium spray rigs operate between 2 and 60 L/min. Wide booms with high volume nozzles may need up to 100 L/min.
What wetted materials resist glyphosate and liquid fertilizers?
PPS and 316 stainless steel with PTFE seals handle most acid and fertilizer mixes. Avoid nylon bodies for long term solvent exposure.
Do these meters work with standard spray controllers?
Yes. Most controllers accept pulse output. Our SI-OG series provides NPN or PNP pulse and 4-20 mA if needed.
What is the lead time for a small order?
We keep common DN15 and DN20 meters in stock. One to two units ship within 5 working days to Australia, Southeast Asia, or Latin America.
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