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Banjo 2 Flow Meter: Sourcing Two-Inch Polypropylene Agricultural Liquid Sensors
Quick Answer: Sourcing a Banjo 2 flow meter or a two-inch polypropylene agricultural liquid sensor comes down to chemical compatibility, flow range, and output signal. Silver Automation Instruments supplies DN50 polypropylene flow meters with pulse or 4-20 mA HART output as direct replacements for common Banjo 2 style meters. To get a firm quote, send your liquid type, flow range, pipe size DN, temperature in °C, and pressure in bar.
This sourcing note covers the Banjo 2 flow meter and two-inch polypropylene agricultural liquid sensors for chemical injection and fertilizer transfer. We field questions about this meter from farms, fertilizer blenders, and irrigation contractors. The two-inch polypropylene body is common because it resists many agricultural chemicals. But sourcing a replacement without checking internal parts can cause early failure.
What the Banjo 2 Flow Meter Is Used For
The Banjo 2 flow meter appears in chemigation, fertigation, and liquid fertilizer transfer. It is not a precision Coriolis meter. It is a simple inline sensor that gives a pulse signal to a rate controller or a batch panel. Typical fluids include urea ammonium nitrate, phosphoric acid, potassium chloride blends, and water with trace chemicals. Flow range for a two-inch design often runs from 20 to 200 liters per minute depending on viscosity and line pressure. Some farms run the meter on 50 mm PVC or poly pipe. That is the same as DN50.
In practice, agricultural controllers accept a simple pulse input. A 4-20 mA HART signal is useful when you need totalization and remote monitoring from a PLC. For low conductivity fluids below 20 µS/cm, an electromagnetic meter is not the right choice. A polypropylene pulse sensor works because it does not need liquid conductivity. This is one reason the Banjo 2 style remains popular in agriculture.
Two-Inch Polypropylene Sensor Specifications That Matter
Do not buy on pipe size alone. A two-inch agricultural liquid sensor has four specifications you need to confirm. First, the body and rotor material must match the fluid. Polypropylene handles many acids but not strong solvents. Second, the rotor bearing material decides service life. Ceramic bearings work well with fertilizers. Tungsten carbide costs more but lasts longer in abrasive mixes. Third, the output signal must match the injection pump or controller. Common outputs are reed switch pulse, Hall effect pulse, and 4-20 mA HART. Fourth, check the temperature and pressure derating. Polypropylene rated for 10 bar at 20 °C may drop to 4 bar at 60 °C. We have seen customers run a meter at 70 °C and crack the body within weeks.
Common Field Failures We See in Southeast Asia and Oceania
Here is the thing. A lot of agricultural flow meters look the same on the outside. The failures are inside. A fertilizer blender in Vietnam asked us to replace a Banjo 2 style meter that stopped sending pulses after two seasons. The rotor shaft had worn because the original design used a stainless steel pin that was not compatible with acidic fluid. Another farm in Queensland had a polypropylene body fail because the pump bypass created water hammer. Polypropylene is strong but rigid. It does not tolerate pressure spikes well. If your system has a piston or diaphragm pump, install a surge chamber or a flexible connect
How to Specify a Replacement Without Guesswork
Send the data you already have from the pump or controller manual. We need the pipe size, which is DN50 for the two-inch Banjo 2 flow meter. We need the minimum and maximum flow rate in liters per minute or gallons per minute. We need the liquid name or at least the main chemical. We need the operating temperature in °C and pressure in bar. We need the output signal type. If you do not know the signal, tell us the controller brand and model. We can match the signal.
Silver Automation Instruments Options for DN50 Agricultural Liquids
Silver Automation Instruments supplies two-inch polypropylene flow meters as a direct replacement for many Banjo 2 flow meter installations. The body is glass filled polypropylene for better pressure handling. The rotor is PVDF or polypropylene depending on chemical compatibility. Bearings are ceramic or tungsten carbide. Seals are EPDM, FKM, or PTFE encapsulated. The standard flow range is 20 to 250 liters per minute for water-like liquids with viscosity under 20 cP. Accuracy is plus or minus 1 percent of reading over the upper half of the range. Lower flows drop to plus or minus 2 percent of full scale. Outputs include reed switch pulse, NPN pulse, and 4-20 mA HART. The meter can be paired with a PT100 temperature sensor if you want flow and temperature data on the same loop. Process connections are two-inch NPT female or two-inch tri-clamp. For aggressive chemicals we also offer a Hastelloy shaft option.
We keep standard DN50 polypropylene agricultural liquid sensors in stock for fast shipping to Southeast Asia, Oceania, the Middle East, Latin America, and Africa. Most orders ship within five working days after payment.
Frequently Asked Questions
Is the Banjo 2 flow meter the same as a two-inch polypropylene agricultural liquid sensor?
Not exactly. Banjo 2 is a specific product line. A two-inch polypropylene agricultural liquid sensor is the broader category. Silver Instruments offers a compatible replacement under our own brand.
Can Silver Automation Instruments supply a direct replacement for the Banjo 2 flow meter?
Yes. We match the process connection, flow range, and output signal. Send us the controller model if you are not sure about the signal type.
What flow range and output signals are available?
For DN50 polypropylene meters the standard flow range is 20 to 250 liters per minute. Outputs include reed switch pulse, NPN pulse, and 4-20 mA HART.
Does polypropylene handle fertilizers and acids?
Polypropylene handles many fertilizers, phosphoric acid, and mild acids. It does not handle strong solvents like methylene chloride. Check the chemical compatibility before ordering.
What information is needed for a quotation?
Send us your pressure in bar, temperature in °C, pipe size DN, flow range in liters per minute, and output signal. That is enough for a firm quote.
Request a quote for a two-inch polypropylene agricultural liquid sensor. Send us your liquid type, flow range, pipe size DN, operating temperature in °C, pressure in bar, and output signal. Contact Silver Automation Instruments by Tel +86-135-1213-1526, WhatsApp 86-135-12131526, or WeChat +86 13512131526. You can also visit flow-meter.com.au for product data sheets.