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Contoil Flow Meter Sourcing: Aquametro Marine Diesel Engine Petroleum Logs
Quick Answer: A Contoil meter on a marine diesel engine can be replaced with a compatible oval gear flow meter. Match DN size, flow range, temperature, pulse or 4-20 mA output. Silver Automation Instruments supplies DN10 to DN25 fuel oil meters for petroleum logs. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range.
Why Contoil and Aquametro Meters Are Common in Marine Diesel Service
Contoil and Aquametro fuel oil meters appear often on marine diesel engines because they handle viscous fuel in a compact housing. Typical auxiliary engine flow sits between 2 L/h and 600 L/h. A Contoil VZO style meter uses an oval gear measuring chamber and gives a local mechanical total. Many vessels use two meters, one on the supply line and one on the return line. The petroleum log subtracts return flow from supply flow to get net fuel consumption. This method is common in Vietnam, Indonesia, Malaysia, and the Philippines.
Key Differences Between Contoil Original Meters and Industrial Replacements
Original Contoil meters often have long delivery times outside Europe. A replacement from Silver Automation Instruments can be built with DN15 flanges, pulse output, and a 4-20 mA HART signal. The body can be cast iron or stainless steel. For diesel and light fuel oil, cast iron with aluminum rotors works well. For heavy fuel oil, stainless steel with PEEK bearings is safer.
A suitable oval gear flow meter for diesel should hold plus or minus 0.5 percent of reading over a 10:1 turndown. Repeatability should be better than 0.1 percent. Pulse output can be scaled to 1 mL per pulse or 0.1 L per pulse. Pulse output works with PLC counters, engine monitoring systems, and paperless recorders.
Petroleum Logs and Engine Hour Matching
A petroleum log becomes reliable only when the meter signal reaches the recorder without lost pulses. Use screened cable. Keep the run short. If a variable speed drive is nearby, route the meter cable away from it. Most engineers skip this step and later see random pulse counts on the display. Silver Automation Instruments often pairs the fuel oil flow meter with a paperless recorder or a batch counter. The recorder stores total fuel per hour and total fuel per day. A flow drop can mean a clogged filter or air in the line. The recorder data feeds the petroleum log and cuts manual reading errors.
Sourcing Checklist for Marine Diesel Petroleum Flow Meters
Before you send an inquiry, collect five data points. Pipe size is usually DN10, DN15, DN20, or DN25 for Contoil replacements. Flow range is often 1 to 100 L/h, 20 to 600 L/h, or 50 to 1000 L/h. Operating pressure is usually 10 bar or 16 bar. Fuel temperature is often 20 to 80 degrees Celsius for diesel. Fuel viscosity can be 2 cP for marine ga
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State the output signal too. Original Contoil meters sometimes use a pulse reed switch. New replacements can include a 4-20 mA HART output, an NPN pulse, or a PNP pulse. For hazardous zones, specify ATEX Zone 1 or Zone 2. For an engine room diesel line, an IP65 aluminum pulse meter is enough. For main engine heavy fuel oil service, use a stainless steel body and a high temperature reed sensor.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We can recommend a meter and quote within one working day. Contact Silver Automation Instruments. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526.
Recommended Model for Contoil Replacement
A common starting point is a DN15 oval gear flow meter with an aluminum body and pulse output. Range is 2 to 120 L/h. Accuracy is 0.5 percent of reading. Repeatability is 0.03 percent. Pressure rating is PN16. Temperature rating is 120 degrees Celsius. The meter can run with diesel, light fuel oil, and biodiesel blends up to B20. For higher biodiesel blends, ask for Viton seals. For larger generator sets, a DN20 cast iron meter with 10 to 600 L/h range works well. The DN20 meter can be fitted with a 4-20 mA HART transmitter for engine monitoring.
Frequently Asked Questions
Can a standard oval gear flow meter replace a Contoil VZO meter? Yes. Choose the same DN size and flow range. Match the process connection. Most Contoil VZO meters use threaded or flanged connections from DN10 to DN25. Confirm the output type before ordering.
What is the difference between a petroleum log and a simple fuel total counter? A petroleum log records flow over time and often subtracts return flow from supply flow. A simple counter only shows total fuel through one meter. For engines with a return line, use two meters for net fuel consumption.
Do I need ATEX certification for a marine diesel engine fuel meter? Only if the meter is in a hazardous zone. Many engine rooms are safe zones. If the vessel carries LPG or crude oil, confirm the zone classification. Silver Automation Instruments can provide ATEX Zone 1 or Zone 2 certificates.
Which signal is best for a paperless recorder? A pulse output is easiest for total flow. A 4-20 mA signal is better for instant flow and diagnostics. Use both if the recorder supports both inputs.
What information should I send for a fast quote? Send fuel type, pipe size (DN), flow range, pressure (bar), temperature (°C), and required signal. Also mention if the meter is for the supply line only or for supply and return lines.
Need a Contoil flow meter replacement or a marine diesel fuel measurement package? Contact Silver Automation Instruments. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526.
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