Archived technical note, republished as independent reference material. Not affiliated with any manufacturer; no product is offered. (This page preserves a legacy URL from the original Indonesian-language catalogue for continuity, reframed as neutral technical content.)
The M7 is a 2-inch (DN50) member of the Liquid Controls M-series of rotary positive-displacement meters — a mid-range size widely used for petroleum transfer on delivery trucks and dispensing systems. This note describes the meter class it belongs to.
A Mid-Range Transfer Meter
At 2 inch, the M7 targets flows in the tens to low hundreds of litres per minute — the sweet spot for road-tanker delivery and workshop fuel transfer. As a rotary PD meter, it measures fuel directly by carrying fixed volumes through its chamber, so it needs no straight pipe run and reads accurately even as viscosity varies with temperature. Expect the usual M-series accuracy of roughly ±0.2–0.5% of reading with strong repeatability.
Typical Build
A meter in this role is usually paired with a mechanical or electronic register, a strainer and an air eliminator, and often a preset counter that stops delivery at a set quantity. For legal-for-trade delivery, the system is proved against a reference and may carry temperature-volume compensation, in line with OIML R117 and the API MPMS discussed on our calibration page.
Care in Service
The M7's accuracy depends on clean fuel and vapour-free flow. A blocked strainer or an air slug during pump start-up are the two most common causes of a delivery dispute; both are prevented by correct upstream fittings. Periodic proving catches the slow accuracy drift that wear inevitably brings.
Related Reading
See the wider Liquid Controls M-series overview, the related M10, and the positive-displacement principle.