Company Profile

Ultrasonic Fuel Flow Meter: High-Precision Marine and Fleet Consumption Logs

Quick Answer: An ultrasonic fuel flow meter from Silver Instruments measures diesel, HFO, and MDO consumption on vessels and fleet vehicles with ±0.5% accuracy. It uses clamp-on transducers, avoids pipe cutting, and logs data via Modbus RTU or HART. Send your pipe diameter (DN), fuel type, and flow range for a quote.

Why Ship Operators and Fleet Managers Replace Mechanical Meters

Mechanical fuel meters wear out. Gears jam from heavy fuel oil residue around 380 cSt. Bearings fail when a vessel runs 6000 hours per year. We hear this from marine engineers in Singapore and Durban every quarter. An ultrasonic flow meter has no moving parts. No gears, no bearings, no filters that clog. The transducers clamp outside the pipe. The fuel never touches the sensor. This means zero pressure drop and no maintenance visits to the engine room just to swap a meter.

Silver Automation Instruments supplies clamp-on ultrasonic fuel flow meters designed for continuous marine diesel and fleet refuelling logs. A recent installation on a trawler in New Zealand cut monthly maintenance checks from three to zero. The chief engineer told us he now trusts the digital log more than the old oval-gear totalizer.

How the Ultrasonic Fuel Flow Meter Works in Heavy Fuel Applications

Our meter uses transit-time technology. Two transducers send ultrasonic pulses upstream and downstream through the pipe wall. The difference in travel time gives flow velocity. The flow computer calculates mass or volume flow using pipe diameter and fuel density at working temperature. Accuracy holds at ±0.5% of reading from 0.03 to 20 m/s. Many refuelling terminals in West Africa validate custody transfer runs with this same principle.

For heavy fuel above 180 cSt we recommend the high-power transducer option and PT100 input for density compensation. Viscosity changes from 30°C to 95°C can shift readings by 2% if you skip temperature correction. Our model SUF-800 meter integrates PT100 directly into the transmitter and outputs a corrected volumetric total in litres or US gallons.

Real-Time Fleet Consumption Logs Without Software Headache

Fleet operators need more than a local display. They need hour-by-hour fuel consumption per engine, per generator, per trip. Silver Instruments flow meters stream data over RS485 Modbus RTU to your existing PLC or vessel management system. No proprietary cloud subscription. Just an open register map so your automation engineer maps Modbus addresses to consumption counters. On a dredger in Lagos, the crew logged main engine and auxiliary engine fuel separately using two clamp-on meters and a simple Siemens LOGO PLC. They now spot fuel theft within a 20-litre window during bunkering.

Key Specifications Engineers Ask For

Pipe sizes from DN15 up to DN6000, with a single pair of transducers covering DN50 to DN300. Measurement accuracy ±0.5% of rate for linear flow. Repeatability better than 0.15%. Outputs: 4-20 mA HART, RS485 Modbus, pulse, and optional wireless bridge. Power supply 24 VDC standard, with 110-240 VAC option. Ingress protection IP66 for sensor, IP65 for the transmitter. ATEX Zone 1 and Class 1 Div 2 certifications available for engine rooms with gas detection risk. Flow range 0.01 to 25 m/s, bidirectional measurement standard.

Process temperature sensors handle 150°C fuel without coupling gel failure. The standard transducers work on carbon steel, stainless steel, and copper-nickel pipes. Polyethylene and rubber-lined pipes need a different transducer set. We design meter spools with integrated RTD pockets for small-line applications under DN15.

Installation That Fits Into a Port Call Schedule

A clamp-on meter installs in under two hours. You do not cut pipes, drain fuel, or shut down the engine. The crew cleans a 300 mm secti