XL Series
We’ve got you covered
The XL Series inline viscometer range covers everything. Every fluid. Every application. With mind-blowing performance, around the clock, around the globe. We’re always there. The most noisy, hot, cold, fast, hygienic, aggressive, hazardous, or extreme environment you can imagine. From high temperatures and pressures, to open tanks and troughs. There’s a Hydramotion for you.Standard > | High Temperature > | Long Reach > | Special Ops >

XL3Ultra-compact, ultra-lightweightCore performance in an ultra-small package. Standalone and ready to deploy Discover XL3 > |
XL5Compact and lightweightSmall scale. Zero compromise. High performance with a reduced footprint Discover XL5 > |
XL7The ultimate powerhouseFull spec and fully configurable. The industry standard process viscometer Discover XL7 > |
Spec Ops*Pushing the boundariesBespoke design service. Any shape, any size, any spec. Tailored to you Discover Spec Ops > |
Key Features
SMART SOLUTIONS FOR INDUSTRY
Every viscometer is engineered to deliver reliable, repeatable performance in demanding environments, providing practical solutions to critical process measurement problems across a broad range of applications.
Operating Principle
- The solid stainless steel sensor element is submerged in the fluid and made to move back and forth microscopically at a specific frequency
- As the surface of the sensor shears through the liquid, energy is lost to the fluid due to its viscosity
- The dissipated energy is accurately measured by Hydramotion’s microprocessor-controlled electronics and equated back to viscosity
- Higher viscosity causes a greater loss of energy and hence a higher reading
Installations
Installation Options
Tank MountedInstall in a tank or vessel of any size, in any orientation, with a mating process fitting. Bespoke sensors available for limited space |
Pipe Elbow MountedFor optimal elbow installation mount transducer in a pipe bend and pointing into the heart of the flow. Any pipe size. Any flow rate |
Pipe Tee MountedTee mounted option for large bore pipes to reach the middle of the flow. And a reducing tee option for a high integrity mechanical connection |
Any process connection

FlangedAll shapes and sizes available. Flange standards include: ASME, DIN, BS10, JIS/KS and others |
HygienicAny size or type of sanitary fitting. Tri-clamp, RJT, IDF, DIN, SMS, Varinline® and others |
ThreadedAll common thread types available. NPT, NPS, BSPP, BSPT, UN/JIC/SAE, Metric and others |
Special Ops
Our Engineer To Order division routinely deals with many complex design objectives. Working with your existing plant layout, our engineers use their knowledge and expertise to create a perfect fit – anything from a slight alteration to an extension of several metres. We have a huge legacy of experience to draw on and can cope with just about anything.Inactive shaft extensions means we can accommodate varying nozzle lengths and sizes. And custom sensor geometries means we can design an instrument to your exact viscosity range, sensitivity, and process specifications whilst maximising performance.

Take the next step…
Connectivity
![]() VP550The VP550 Processor provides all the functions needed to get the best out of your inline viscosity meter. Critical viscosity data and sensor management are available at the touch of a button.Learn More > |
![]() VP250A compact, rail-mounted mini-processor that connects to Hydramotion viscosity sensors. Acts as an intelligent terminal block with a miniature display and useful analogue and digital outputs.Learn More > |

EX CERTIFIED
Every XL5 and XL7 viscometer is available as an Ex Certified product and is certified using the Intrinsic Safety (IS) protection method.IS certification permits a simpler installation than flameproof. The Ex ‘ia’ certificate allows transducers to be operated even in the most hazardous Zone 0 environments.

A HOME FROM HOME
We don’t believe in expensive service contracts or regular downtime. Our instruments are built to last. And every viscometer comes with the Hydramotion seal of approval.
All this is supported by our After Sales team who ensure that our track record as successful partners in shared challenges is maintained. Every viscometer purchase grants you access to our world class support backed up by over 30 years industrial experience solving the most complex problems in the viscosity measurement world. It’s a service we hope you’ll never need, but we’re always here. Your home from home.

Explore all industries
Auto & AerospaceHydramotion viscometers are used widely in manufacture, maintenance and operational applications in transport technologies for coatings, adhesives, lubricants and fuels…Explore > |
Bio-fuels & RenewablesThe viscosity of fuels affects their ignition temperature, heat of combustion, the rate at which they burn, density, melting points, energy density and lubricity…Explore > |
ChemicalsMeasuring viscosity is critical during mixing, blending, and detecting the reaction end-point, which is often the key to reducing waste and eliminating batch failures…Explore > |
CoatingsThe repeatability and reproducibility of the coating process is closely linked to the coating’s viscosity, and is therefore a key parameter to control. Dip-in, tank based or in-line sensors…Explore > |
Combustion & PowerHigher viscosity fuels have poorer combustion efficiency. Viscosity influences the degree of preheating required for satisfactory atomisation, handling, storage…Explore > |
CosmeticsViscosity is critical for product consistency and structural stability. Creams, lotions, gels and suspensions have strict requirements for consumer acceptance and use…Explore > |
Food & BeverageViscosity is critical during the food production process to control flowability, waste product and product quality, in order to maximise production efficiency and cost…Explore > |
Inks & DyesViscosity has a direct influence on final print results and quality. Controlling the viscosity of inks and dyes is a major factor in managing costs and maintaining quality…Explore > |
Mineral ProcessingHydramotion viscosity meters are found at that heart of many mineral processes: pumping and transport, grinding, flotation, mixing/leaching, and thickening…Explore > |
Oil & GasHydramotion viscosity meters are used widely for the measurement of crude oil and all its refined fractions, either as part of the refinement processes or end products…Explore > |
PharmaceuticalsWhether it is small samples, reaction vessels, or large volume processing, Hydramotion viscometers measure viscosity at the heart of the fluid as the reaction progresses…Explore > |
PolymersThere is a Hydramotion in-line viscosity meter for every stage of polymer processing and handling: material manufacture, melt pipe transportation, or extruder…Explore > |
Pulp & PaperThe amount of starch has an impact on paper strength, printability and other qualities and can be controlled in real time since solids concentration is precisely related to viscosity…Explore > |
ResinsMeasuring the viscosity of resin in the process is absolutely critical to its outcome: it is a powerful reaction indicator at either the manufacture, storage or use stages…Explore > |
Waste & WaterViscosity is important for the manufacture and use of polymers for water treatment. Polymer chain lengths directly influence viscosity, as does polymer dilution and crosslinking…Explore > |

