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Diesel Oil Flow Meter 100 L/h Burner Optimization: Manuals, Settings, and Field Data
Quick Answer
A diesel flow meter sized for 100 liters per hour must deliver a stable signal to the burner controller even when oil viscosity swings from 3 cP to over 300 cP. Silver Automation Instruments recommends oval gear flow meters with DN10 or DN15 connections, built‑in PT100 temperature compensation, and ATEX Zone 1 certification. These meters help burner technicians lock the correct air‑to‑fuel ratio, cut soot formation, and typically save 2 % to 5 % fuel on industrial boilers and thermal oil heaters.
Why Burner Optimization Manuals Demand a Dedicated 100 L/h Diesel Meter
Most industrial burner manuals from Riello, Weishaupt, or Riello BurnerTech skip a critical detail. They assume the fuel supply provides a constant, known flow. In practice, a cold morning in Surabaya or a humid afternoon in Lagos changes diesel viscosity enough to shift the actual flow by 10 % to 18 %. The burner then runs rich or lean without any alarm. That small error, hour after hour, adds up to soot buildup, heat exchanger fouling, and a direct hit on fuel economy. A dedicated 100 L/h diesel oil flow meter closes this loop and gives the PLC real numbers instead of assumptions.
Many burner optimization manuals also call for a fuel flow input on pin 3 or pin 7 of the controller, usually a 4‑20 mA HART or a scalable pulse train. A general‑purpose turbine meter struggles below 2 cSt and drifts when the Reynolds number drops. Diesel at 15 °C in a DN15 pipe often sits right at the lower limit of a turbine meter. The result is a signal that jumps and confuses the PID loop. This is exactly what we saw at a paint factory in Vietnam last year. The customer used a small turbine meter for a 100 L/h diesel line to a thermal oil burner. Every morning the burner faulted on low flame three to four times before the oil warmed up. We replaced it with an oval gear meter with a PT100 sensor and the call‑outs stopped the same day.
Oval Gear Meters: The First Choice for 100 L/h Diesel Burner Lines
Positive displacement oval gear meters ignore most of the viscosity drama that trips other technologies. Two oval rotors mesh inside a measurement chamber and sweep fixed volumes. The output is a train of pulses where each pulse equals a known volume, typically 0.367 mL or 1.0 mL per pulse on a DN10 meter. That raw pulse count does not depend on flow profile, Reynolds number, or moderate viscosity changes. In a burner retrofit, you wire that pulse output straight to the fuel counter input on a Lamtec or Siemens LMV controller and set the K‑factor once.
Silver Automation Instruments stocks oval gear meters purpose‑built for light oil and diesel. Our OGF‑A series in DN10 covers a flow range of 5 to 250 L/h with a standard accuracy of ±0.5 % of reading. The body is 316L stainless steel with FKM seals, rated to 40 bar, so it handles the supply pressure of most ring‑main systems. The meter accepts an integrated PT100 sensor for temperature compensation. Set the density reference at 15 °C, enable density correction in the transmitter, and the 4‑20 mA output reflects actual mass flow of diesel, not just volume. Burner efficiency calculations then become consistent across different oil batches and ambient temperatures.
Field Tuning: Viscosity, Temperature, and Pulse Scaling
Here is the thing most burner engineers skip. Diesel delivered in Singapore may have a kinematic viscosity of 4.5 cSt at 40 °C, while a shipment into Saudi Arabia in January can arrive at 6.2 cSt. That difference alone shifts the volume reading of a viscosity‑sensitive meter by over 3 %. An oval gear meter does not care much about that shift, but the temperature effect on density still matters if you express fuel consumption in kg/h. The manual for many industrial burners recommends correcting fuel flow to 15 °C or to standard mass units.
Our OGF meters pass the raw pulse frequency and the calculated 4‑20 mA signal simultaneously. You can connect the pulse output to the
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In one case, a boiler service company in Mexico retrofitted twelve 100 L/h diesel burners across a textile plant. They used our DN15 oval gear meters with M12 connectors and a single 24 V DC supply. Commissioning time per burner dropped from six hours with the old turbine meters to under one hour. The maintenance manager told us they now receive a consistent 4‑20 mA trend without spikes after 18 months of runtime.
Size, Connection, and ATEX Considerations
For 100 L/h diesel, DN10 is generally enough. If the line is shared with a higher‑capacity backup pump, DN15 gives margin without sacrificing turndown. Both sizes come with BSPP or NPT threaded connections. Flanged versions in DN15 PN16 are also available for plants that follow ASME B16.5 or EN 1092 standards. The pressure drop across an oval gear meter at 100 L/h is typically below 200 mbar, so the existing fuel pump or gravity head rarely needs an upgrade.
Many burner skids place the flow meter directly next to the burner head. That location is often classified as Zone 1 or Zone 2 under ATEX or IECEx. Silver Automation Instruments supplies the OGF‑A series with ATEX certification Ex ia IIC T4 Ga/Gb and IECEx. The electronics loop is intrinsically safe and connects to a certified barrier in the control panel. No purged enclosures, no extra conduit runs. We also offer a mechanical register version for sites that only need local indication, this option needs no external power and is ATEX approved as a simple mechanical device.
FAQ
Which meter type holds accuracy best for 100 L/h diesel burners?
Oval gear positive displacement meters keep ±0.5 % accuracy even when viscosity moves from 3 cP to 500 cP. Coriolis mass meters work too but cost significantly more for small bore lines. Turbine meters often fall below their minimum Reynolds number and lose accuracy at low flow or cold start.
What pipe size should I install for a 100 L/h diesel line?
DN10 handles 100 L/h with ease on most diesel grades. DN15 gives you room if the same line sometimes supplies a pilot burner or a larger boiler. Always check the pressure drop against the pump curve, but in practice a DN10 oval gear meter operates below 200 mbar loss at this flow.
Do I really need a temperature sensor inside the diesel flow meter?
Yes if the diesel temperature varies more than 10 °C across a day or between seasons. An integrated PT100 corrects density and keeps the output in kg/h stable. That correction aligns with burner manuals that require fuel mass flow for efficiency reports.
Can the meter talk directly to my burner management system?
Yes. Oval gear meters from Silver Instruments output a scalable pulse or 4‑20 mA HART. They connect directly to controllers from Siemens, Lamtec, Weishaupt, and Riello. The K‑factor entry is a one‑time setup step.
Is ATEX or IECEx certification mandatory for diesel flow meters near a burner?
Usually yes. Most burner installations in refineries, chemical plants, and marine boiler rooms classify the fuel skid as Zone 1 or Zone 2. We provide intrinsically safe oval gear meters with ATEX and IECEx that match those zone requirements.
How to get a quote that matches your site conditions
Tell us your normal diesel temperature range, operating pressure, required output signal, and pipe thread type. Send the fluid viscosity if you know it, along with whether you need ATEX or general purpose certification. Our engineers will propose a DN10 or DN15 oval gear meter with the right pair of seals, sensor, and electrical approval. The quote typically lands in your inbox within one business day.
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