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Electronic Fuel Flow Meter Installation: Real-Time Consumption Tracking for Diesel and Gas
Quick Answer: Silver Automation Instruments supplies electronic fuel flow meters for diesel and gas. Use an oval gear flow meter for diesel lines and a thermal mass flow meter or Coriolis mass flow meter for gas lines. Send your fuel type, pipe size DN, pressure in bar, temperature in deg C, and flow range for a specific quote.
Start With the Fuel Type
Diesel and gas are not the same. Diesel is a liquid with viscosity from 3 to 6 cP at 20 deg C. Gas is compressible. The flow meter technology changes with the fuel type. We see customers confuse this on quotes every month.
For diesel, Silver Automation Instruments recommends an oval gear flow meter. It works from DN4 to DN50. It handles flow rates from 0.05 L/min to 300 L/min. Accuracy is plus or minus 0.5 percent of reading. Diesel viscosity is low enough for tight clearances. In practice, this meter is easy to maintain if you install a strainer upstream.
For gas, we recommend a thermal mass flow meter or a Coriolis mass flow meter. Thermal mass meters work well for burner supply lines, gas engines, and boiler fuel systems. Coriolis meters are the better choice when you need accuracy better than 0.2 percent or high pressure gas metering.
Diesel Line Installation Details
Install the oval gear meter directly in the fuel supply line. Do not install it on the return line only. The meter must see the total fuel consumed by the engine or boiler. If the system has a return line, install the supply meter before the engine and use a second meter on the return line. The difference is real consumption.
Use a Y type strainer or basket strainer before the meter. Diesel can contain small particles. One stuck particle can scratch the oval gears. We have seen this on a customer site in Manila where a missing strainer caused an error of 12 percent after three months.
For a standby generator in Lagos, we used DN25 oval gear meters on the supply and return lines. Flow range was 0.5 to 50 L/min. Operating pressure was 3.5 bar. The meter had a pulse output and a 4-20 mA HART output. The panel displayed real time fuel consumption in liters per hour and total liters.
Mount the meter with the rotor shafts horizontal. This keeps air from collecting in the measuring chamber. If your diesel line has air bubbles, install an air eliminator before the meter. Air causes the reading to jump.
Gas Line Installation Details
Gas meters require straight pipe runs. For a thermal mass flow meter, allow 15 pipe diameters upstream and 10 pipe diameters downstream. For a Coriolis meter, the straight run requirement is shorter but the meter must be full of gas at stable pressure.
If you measure LPG or natural gas, confirm the gas composition and pressure. A food processing plant in Guatemala measured LPG at 1.8 bar on a DN50 line. Flow range was 0 to 180 kg/h. The thermal mass flow meter had a 4-20 mA output and an RS485 Modbus output. The plant tracked consumption per batch in SCADA.
In a hazardous area, select an ATEX Zone 1 or Zone 2 approved model. Some gas meters from Silver Automation Instruments have Ex db or Ex tb protection. Tell us the zone classification before ordering.
Do not install a thermal mass meter near a pressure regulator without enough straight pipe. The regulator creates swirl. Swirl affects the reading.
Electrical Wiring and Real 
Most electronic fuel flow meters from Silver Automation Instruments accept 24 V DC. Outputs include pulse, 4-20 mA HART, or RS485 Modbus. Use shielded twisted pair cable. Keep the signal cable away from motor cables and variable frequency drives.
For real time consumption, connect the 4-20 mA signal to the PLC analog input. Scale it to liters per hour or kilograms per hour. The update time is typically one second. For engine fuel monitoring, a pulse output gives total flow with high resolution. Connect it to a digital input or a totalizer display.
One customer in Vietnam uses a paperless recorder to log diesel flow on 12 generators. The recorder stores data for 12 months. The operator checks daily consumption trends every morning. That setup cost less than a full SCADA system and gave enough detail for fuel theft detection.
Installation Mistakes That We See Often
Most engineers skip the strainer on diesel lines. This is the top failure cause. The second mistake is installing a gas flow meter without enough straight run. The third mistake is ignoring temperature and pressure correction for gas. Gas volume changes with pressure and temperature. A mass flow meter solves that problem because it reads mass directly.
Another common error is using a liquid flow meter on gas or a gas meter on diesel. These fuels have different density and viscosity. The meter may output a signal but the reading will be wrong.
How to Specify Your Electronic Fuel Flow Meter
We need a few operating details. Send us the fuel type, pipe size DN, pressure in bar, temperature in deg C, minimum and maximum flow rate, and the required signal output. Also tell us if the installation is in a hazardous area and if you need a local display.
For example, a customer in Lima asked for a diesel flow meter for a mining generator. They sent DN25, 2 to 4 bar, 15 to 30 deg C, 0.5 to 40 L/min, and pulse plus 4-20 mA. We quoted an oval gear meter with a stainless steel body and a totalizer display. The order shipped in 7 days.
Contact Silver Automation Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610. Send your fuel type, pressure in bar, temperature in deg C, pipe size DN, and flow range. We will recommend the right meter and send a quote within 24 hours.
FAQ
Can one electronic fuel flow meter handle both diesel and gas?
No. Diesel is a liquid. Gas is compressible. Use an oval gear meter for diesel. Use a thermal mass flow meter or a Coriolis mass flow meter for gas.
Do I need straight pipe for a diesel oval gear flow meter?
Oval gear meters do not need long straight runs. A short length before and after the meter is enough. Gas meters need more straight pipe.
What output is best for real time consumption tracking?
4-20 mA HART works well for analog loops. Pulse output is good for totalizing. RS485 Modbus is best when you have multiple meters on one network.
What accuracy can I expect?
Oval gear diesel meters are plus or minus 0.5 percent of reading. Thermal mass gas meters are plus or minus 1.5 percent of reading. Coriolis gas meters are plus or minus 0.1 to 0.2 percent of reading.
Can the meter be installed outside?
Yes. Choose an IP65 or IP67 housing. If the area has flammable gas, order an ATEX approved model and tell us the zone classification.
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