Marine Diesel Fuel Flow meter
A diesel flow meter is an instrument that uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate. This type of flowmeter is used to detect instantaneous flow and total cumulative flow, and its output signal is frequency, easy to digitize. Diesel flowmeter is small pressure loss, large range, high accuracy, in the measurement of work volume flow is almost independent of the fluid density, pressure, temperature, viscosity and other parameters.
Overview
Operation:
The induction coil is fixed to the casing along with a permanent magnet. When a ferromagnetic turbine blade passes over the magnet, the magnetic resistance of the magnetic circuit changes, resulting in an inductive signal. The signal is amplified and shaped by an amplifier and sent to a counter or frequency meter to indicate the total accrued flow. The pulse frequency is also frequency-to-voltage converted to indicate the instantaneous flow rate. The rotational speed of the impeller is proportional to the flow rate, and the number of revolutions of the impeller is proportional to the total amount of flow through it. The output of the turbine flowmeter is a frequency-modulated signal, which not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system. Its range ratio of up to 10:1, accuracy within ± 0.2%. Small inertia and small size of the turbine flowmeter time constant of up to 0.01 seconds.
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