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LC Flow Meter for Diesel Transfers: Weights and Measures Certified Fleet Fuel Totalizers
Quick Answer: Silver Instruments LC flow meters are positive displacement meters for diesel transfer and fleet fuel totalizing. Each meter has a local mechanical totalizer and can send pulse output to a fuel management system. Weights and Measures certified versions are available for buyers who need approved totals for tax records or custody transfer.
Fleet refuelling is a daily cost. Mining, agriculture, road construction and marine services often refuel from a central tank. Without a meter, the fuel volume per machine is only an estimate. That estimate causes disputes after a few months. We have seen this on customer sites many times.
An LC flow meter for diesel transfers solves the problem. It measures each refuelling event and shows the total liters delivered. The meter is small enough for a service truck or fixed pump. Because it is positive displacement, it does not need straight pipe runs like a turbine meter. This is a practical point for crowded fuel skids.
How the LC Meter Works for Diesel
The LC meter uses a pair of oval gears inside a measuring chamber. Diesel fills the space between the gears. Each rotation sweeps a fixed volume. The shaft drives a mechanical counter. You read the total directly from the face. A reed switch or Hall sensor sends a pulse to a remote batch controller if needed. The output is usually 10 pulses per liter or 100 pulses per liter. Check the model before wiring.
Accuracy depends on viscosity and flow rate. For diesel at 20 °C, expect plus or minus 0.5 percent of reading. Repeatability is tighter, around 0.03 percent. That repeatability is what most fleet managers care about. In practice, the LC meter reports the same volume for the same fill day after day. Diesel at 3 to 5 cP keeps the gear clearances well lubricated.
Weights and Measures Certification
Not every diesel transfer needs certified totals. Internal maintenance refuelling usually does not. But if you sell fuel, charge by project, or claim fuel tax rebates, the meter must be approved by the local weights and measures authority.
Weights and measures certified fleet fuel totalizers often carry a type approval number on the register face. That number tells inspectors the meter design has passed repeatability and accuracy tests for the sanctioned fuel duty.
Silver Instruments supplies LC meters with standard factory calibration. We also arrange pattern approval support for specific regions. For Australia, customers often ask for NMI Pattern Approval evidence. For Southeast Asia, the local metrology office may accept OIML R117 test data. Tell us the country and the duty. We will check the certification version before quoting.
Fleet Fuel Totalizer Integration
The mechanical register is the primary totalizer. It keeps the last total even when power is off. For larger fleets, the pulse output feeds a diesel management system. The system logs the date, truck ID and operator. You can then produce reports by site, vehicle or cost centre.
A transport contractor in Vietnam used two LC40 meters on separate diesel lines. The pulse output went to an existing fuel management panel. The installation took one morning. The main issue was wiring the pull-up resistor for the reed switch. That detail is easy to miss in the field.
How to Size an LC Flow Meter for Diesel Transfer
Start with the pump flow rate. If your pump moves 40 liters per minute, do not install a 20 liters per minute meter. The pressure drop rises fast above the rated flow. The gears also wear early.
For a service truck with a 12 V pump, choose the LC25. It covers 1 to 25 liters per minute. Connections are usually DN15 or DN20. For a fixed tank with a 60 liters per minute pump, c
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Tell us your diesel pump flow rate in liters per minute, the pipe size, and the maximum pressure. We will confirm the correct model. Most fleet diesel systems run at 6 to 10 bar. Our LC meters are rated to 20 bar as standard. That margin covers pump pulsation and accidental deadhead conditions.
Common Installation Mistakes
Most engineers skip this part. The meter is simple but three things reduce accuracy in the field. Air in the line gives false totals. Install a Y strainer and remove air before the meter. Pulsating flow from a small gear pump causes the register to jump. Use a flexible hose on both sides. Do not pipe the meter directly to a rigid manifold. Last, do not run the meter dry for long periods. Diesel lubricates the gears.
A contractor in Queensland ran an LC40 dry for two hours during commissioning. The gears scored. The meter still worked but low flow accuracy dropped. We supplied replacement gears in one week. This is a field service example, not a design weakness.
Recommended Models for Diesel Fleets
The LC25 and LC40 are the most common choices for small and medium fleets. Both come with an aluminum or cast iron body. Aluminum is fine for clean diesel in tropical conditions. Cast iron suits dusty yards and mechanical abuse. For marine diesel, confirm the aluminum body is compatible. Salt spray and condensation can pit aluminum. We often suggest stainless steel internals or a cast iron body with epoxy paint.
Standard output from Silver Instruments LC40 includes a 6 digit mechanical totalizer and a reed switch pulse output. The pulse resolution is 10 pulses per liter. The meter accepts 24 V DC or 5 V DC signal circuits. If you need a 4-20 mA HART output, we add a separate transmitter. This is less common on diesel skids but useful for PLC monitoring. For sites with ATEX Zone 1 requirements, ask before ordering. The standard pickup is not certified for Zone 1. The standard temperature range is minus 10 to 80 °C for diesel service.
Frequently Asked Questions
Can the LC flow meter be used for diesel fuel transfer legally?
Yes for internal use. For legal custody transfer or public sale, ask your local weights and measures authority. We provide pattern approval support and calibration documents for many countries.
What flow rate do I need for a fleet refuelling pump?
Match the meter to the pump. A 40 liters per minute pump works with the LC40. A 60 liters per minute pump works with the LC50. Send us the pump flow and pipe size before ordering.
Does the meter retain the total when power is off?
Yes. The mechanical register stores the total. The pulse output only sends live flow information to a remote panel.
What is the accuracy of the LC meter for diesel?
Standard accuracy is plus or minus 0.5 percent of reading at typical diesel flow rates. Repeatability is about 0.03 percent. We calibrate each meter and can supply a serial number certificate.
Can I get a Weights and Measures certified meter for Australia?
Ask us with the site postcode and application. In many cases we supply supporting test reports and the local inspector approves the installation. For high risk custody transfer, an approved dispenser package may be required.
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in liters per minute. Our sales engineers will select the right LC flow meter or diesel totalizer. We ship to Southeast Asia, Oceania, Latin America, Africa and the Middle East. Contact Silver Automation Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, WeChat: +86 15365082610. You can also visit flow-meter.com.au for product data.
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