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Banjo Flow Meter Liters to Gallons: Sourcing, Scale Conversion, and Programming Matrix
Quick Answer: A banjo flow meter measures low to medium flow on spray rigs, chemical injection skids, or small transfer lines. To convert liters to gallons, use 1 L/min = 0.264172 GPM. Silver Automation Instruments supplies industrial flow meters with dual unit display, pulse output, 4 to 20 mA output, and programming settings for liters to gallons scale conversion.
This page gives you a practical sourcing, conversion, and programming matrix. We keep the language simple because engineers and procurement teams search for answers before they send a request for quote.
Where a Banjo Style Flow Meter Fits
A banjo flow meter often refers to a compact turbine or nutating disk meter with plastic banjo fittings. You see these on herbicide spray rigs, fertilizer injection carts, and small washdown lines. The common sizes are DN10, DN15, DN20, and DN25. Field crews like the light body. Maintenance teams replace the plastic parts often. In practice, a metal or industrial plastic flow meter with threaded connections lasts longer and gives a stable 4 to 20 mA signal.
We have seen this on customer sites many times. A customer in Vietnam asked us last year for a DN15 replacement for a banjo meter on a fertilizer dosing trailer. The fluid was a weak acid mixture. The plastic body had cracked. We supplied a PTFE lined electromagnetic flow meter with display in L/min and GPM. The totalizer was set in liters. The analog output was 4 to 20 mA for remote monitoring.
Liters to Gallons Scale Conversion
Use these factors in your PLC, paper log, or flow meter display.
1 L/min = 0.264172 GPM
1 GPM = 3.78541 L/min
1 liter = 0.264172 gallons
1 gallon = 3.78541 liters
For total flow, multiply the liter total by 0.264172 to get gallons. For rate, use the same factor. The scale conversion inside a Silver Instruments flow transmitter uses the same math. You select the display unit from the keypad. The unit change does not alter the K factor of the meter.
A quick field check is this. A flow rate of 10 L/min equals 2.64 GPM. A flow rate of 40 L/min equals 10.57 GPM. A flow rate of 100 L/min equals 26.42 GPM. Most engineers skip the exact decimal until the final calibration sheet.
Sourcing Data That Reduces Quote Delays
Send us these details when you request a quote for a banjo flow meter replacement or a new compact flow meter.
Fluid name and viscosity in cP. Pipe size in DN10 to DN25 or DN50. Flow range in L/min or GPM. Operating pressure in bar. Operating temperature in °C. Output signal such as pulse, 4 to 20 mA with HART, RS485 Modbus, or pulse. Power supply 24 V DC or battery. Connection thread type such as BSPP, NPT, or banjo style clamp.
We ship to Singapore, Indonesia, Thailand, Vietnam, Australia, Saudi Arabia, Mexico, Brazil, and Nigeria. Standard industrial flow meters ship from our facility in 7 to 10 working days. Custom calibration may add 3 to 5 working days.
Programming Matrix for Display and Analog Output
This matrix shows how the 4 to 20 mA output maps to flow rate after liters to gallons conversion. Use it for a fast PLC input check.
| Full scale in L/min | Full scale in GPM | 4 mA signal | 20 mA signal | Pulse scaling example |
|---|---|---|---|---|
| 20 | 5.28 | 0 L/min | 20 L/min | 1 pulse = 0.1 L |
| 50 | 13.21 | 0 L/min | 50 L/min | 1 pulse = 0.25 L |
| 100 | 26.42 | 0 L/min | 100 L/min | 1 pulse = 1 L |
| 200 | 52.83 | 0 L/min | 200 L/min | 1 pulse = 1 L |
If the PLC expects GPM, convert the analog value at 20 mA. Example: 20 mA equals 50 L/min. Multiply 50 by 0.264172. The result is 13.21 GPM. Scale the PLC input accordingly.
Flow Meter Types for Banjo Style Connections
Plastic banjo meters work for water and some weak chemicals. For oils, diesel, urea, or food syrup, choose an oval gear flow meter. For conductive water and wastewater with conductivity above 20 µS/cm, choose an electromagnetic flow meter. For very low flow or high accuracy in chemical dosing, choose a Coriolis mass flow meter. Silver Instruments Coriolis meters report mass flow in kg/h, density, and media temperature from an internal PT100 sensor. For compressed air or nitrogen, choose a thermal mass flow meter. For hazardous areas with solvents or fuel, request ATEX Zone 1 or IECEx certification at the quote stage.
Here is the thing. A plastic banjo meter is cheap, but the replacement cycle adds labor cost. A paint manufacturer in Southeast Asia replaced plastic banjo meters on solvent lines with oval gear flow meters. The previous plastic body swelled. The new flow meters measured in liters on the local display and sent gallons per minute to the control room. The PLC used a pulse input. This setup removed manual log errors.
FAQ
1. Does Silver Automation Instruments sell Banjo brand flow meters?
We do not sell the Banjo brand. We supply industrial flow meters with similar connection sizes and better chemical resistance, accuracy, and output options.
2. How do I change a flow meter from liters to gallons?
Use the keypad menu if the model has a local display. Select display unit, choose gallons or gallons per minute, and confirm. If the model has RS485 or HART, change the register via the host system. Contact our engineers with the model code for the exact menu path.
3. What flow range do I specify for a banjo flow meter replacement?
Give us the minimum and maximum flow in L/min or GPM. Common full scale values for small lines are 10 L/min, 20 L/min, 50 L/min, and 100 L/min. Include the pipe size and the required accuracy class.
4. Can the flow meter totalize in liters and display rate in gallons?
Some Silver Instruments transmitters support separate units for rate and total. State this requirement when you send the inquiry. The programming matrix above helps you align the 4 to 20 mA output with the PLC scale.
5. What is the price range for an industrial compact flow meter?
Price depends on the wetted material, size, output, and accuracy. A DN15 oval gear meter costs less than a DN15 Coriolis meter. Send us the fluid, pressure in bar, temperature in °C, pipe size in DN, and flow range. We return a formal quotation with data sheet and lead time.
Contact Silver Automation Instruments for banjo flow meter sourcing and liters to gallons scale conversion support.
Tel: +86-135-1213-1526
WhatsApp: 86-135-12131526
WeChat: +86 13512131526
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will recommend a flow meter with the right scale conversion and programming matrix for your site.