Flow Meter Reference is an independent technical library about the measurement of flowing liquids and gases. Our goal is narrow and practical: help engineers, technicians, students and buyers understand how each major class of flow meter works, so they can read a datasheet critically and specify the right instrument.
What This Site Is
This is an educational reference. Each page explains a measurement principle, a meter technology, or a family of instruments in vendor-neutral terms. We describe how a device works, what it is good at, its typical accuracy and rangeability, the standards it is tested against, and the failure modes to watch for. Where we name a manufacturer or a model number, we do so only to describe a recognised technology or a representative example — the way a textbook might reference a well-known instrument.
What This Site Is Not
This site is not a shop. Nothing here is for sale, there are no prices, no stock, no ordering, and no quotations. We are not affiliated with, endorsed by, or authorised to represent any flow-meter or water-meter manufacturer, brand or distributor described on these pages. Trademarks referenced remain the property of their respective owners and are used only for identification and technical description. If you want to purchase a specific instrument, go directly to that manufacturer or an authorised distributor.
Outbound Links and Commercial Disclosure
We occasionally link out to organisations, standards bodies and suppliers whose material is relevant to something under discussion. Those are editorial choices, not paid placements within the meter coverage — but readers should know that some outbound links point to suppliers we have a commercial relationship with. That relationship never extends to any of the flow-meter or water-meter manufacturers described on this site, and it does not influence which metering technology we recommend or how we characterise any instrument. Where a page names a meter brand, it does so for identification and technical description only.
Our Editorial Approach
We favour first principles over jargon. Flow measurement is governed by a small set of physical laws — conservation of volume and mass, Faraday's law of induction, the Bernoulli relationship, the Coriolis effect — and almost every instrument is a clever application of one of them. When you understand the principle, the specifications on a datasheet stop being a list of numbers and start telling a story about where the meter will and will not perform.
We aim to reflect accepted engineering practice as published by bodies such as the ISA, the ASME and the International Organization for Standardization (ISO). Where a figure such as a typical accuracy band is quoted, treat it as indicative — always confirm against the specific manufacturer's certified specification for the model and size you are considering.
Corrections
Technical writing benefits from scrutiny. If you spot an error or an oversimplification, we welcome the correction through our contact page. Accuracy is, after all, the whole point of a flow meter.