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Fuel level sensors may support stock records, transfer control or low-level pump protection. Those duties require different evidence. A device suitable for routine level indication is not automatically a certified overfill safeguard, a custody-transfer gauge or a leak-detection system.
Fuel Level Sensors: Separate the Required Decisions
| Duty | Required information | Additional check |
|---|---|---|
| Inventory | Liquid height and a suitable tank-volume relationship. | Temperature, water bottoms and the basis of reported quantity. |
| Transfer | Current level and the time needed to stop filling. | Control response and any required independent overfill function. |
| Pump duty | Usable liquid above the suction requirement. | Drawdown, local disturbance and loss-of-signal action. |
| Loss review | Aligned level, transfer and relevant process records. | Whether a suspected change exceeds the method's uncertainty. |
Qualify the Fuel and Installation Together
Provide the actual fuel grade, operating temperature, pressure, nozzle section and internals. Include water or sludge at the bottom and any product changes. A non-contact radar avoids an immersed probe, but its lens, seals and connection remain exposed to vapour, condensate or splash.
For an MV-RD12 proposal, ask whether the offered construction covers the process and site requirements. Obtain the required equipment documentation for a classified area. Neither the radar frequency nor the enclosure appearance establishes that approval.
Do Not Confuse Direct Level With Corrected Inventory
A radar measures distance to a detected surface. Converting that result into usable fuel volume requires the correct tank table, datum and relevant exclusions. Reporting a quantity at a reference temperature requires additional justified information and calculation; it does not follow from a level reading alone.
Compare inventory at stable times with documented transfers or an appropriate gauge reference. Retain raw distance and the conversion revision. Investigate a level-reference error separately from a volume-table error instead of adjusting one offset until a delivery appears to match.
Fuel-System Questions
Q1. Will a normal surface radar measure the water bottom as well?
Do not assume it reports a second interface. Specify that requirement separately and obtain a supported measurement method. A useful fuel-surface reading does not establish water-bottom height.
Q2. Can the same configuration move between different fuels?
Review changes in composition, reflection, temperature, deposits and approvals. Retain the conditions under which the original application was accepted rather than treating the tank size as the only selection input.
Q3. Is a falling level enough evidence of leakage?
No. Reconcile transfers, temperature-related volume changes and measurement uncertainty before attributing the trend to a leak. Any required leak-detection function needs its own validated method.
Summary
Approve each required function separately and keep level data traceable to the inventory calculation. Submit the fuel specification, tank drawing and site documentation requirements with a fuel-level application enquiry.
