Viscometers
JP Selecta viscometers: digital rotational and calibrated capillary. ASTM and ISO traceable measurement. European manufacturing.
Digital rotational viscometers STS-2025 series (1–320,000,000 cP, 54 speeds) and Ubbelohde, Cannon-Fenske and Micro-Ubbelohde glass capillary viscometers for kinematic viscosity per ASTM and ISO. Integrated Pt100 probe, VB-1423 thermostatic bath and rheology software with 9 working configurations.
Product families (8)
- Precision bath for viscometers
- Viscosity measurement cups
- Rotational viscometers
- Thermostatic baths
- Circulation cryothermostat
- Circulation ultrathermostat
- Immersion thermostats
- Thermostats for viscometers
JP Selecta laboratory viscometers
JP Selecta viscometers measure fluid viscosity with precision traceable to international standards — a critical property in the quality control of paints, adhesives, cosmetics, foods, lubricants and pharmaceutical formulations.
Our range includes digital rotational viscometers with automatic range selection and viscosity calculation in mPa·s (cP), and calibrated glass capillary viscometers for measuring kinematic viscosity per ASTM and ISO standards.
All units ship with a calibration certificate, an integrated temperature probe for automatic compensation and software to generate test reports compliant with industrial standards.
Our viscometer range
Our instrumental line offers advanced solutions for the rheological characterisation of fluids, adapting to the nature of each analytical sample.
Digital rotational viscometers
Measure the torsional force on a rotating spindle at constant speed, covering a range from 1 to 320,000,000 cP depending on the model.
The STS-2025 series splits into three variants:
- L (low viscosity, up to 6,000,000 cP).
- R (medium, up to 40,000,000 cP).
- H (high, up to 320,000,000 cP).
They integrate 54 pre-selected speeds (0.01–200 rpm), autotest with speed sweep and datalogger with USB transfer to Excel. Available with the LCP adapter for samples from 1 cP in 16 ml and the APM adapter for reduced volumes of 6.7–13.5 ml with water-circulation jacket.
Glass capillary viscometers
Determine the kinematic viscosity by measuring the time taken for a volume of liquid to fall by gravity through a calibrated capillary, with a range from 0.3 to 100,000 cSt.
Available in Ubbelohde, Cannon-Fenske, Micro-Ubbelohde (3 ml of sample), Ostwald and reverse-flow U-tube formats.
For repeatable readings, the VB-1423 bath (20 L, ±0.1 °C, three openings) and DIN, ISO and Ford cups coupled to the TV-1452 Peltier thermostat ensure the test's thermal stability.
For complementary instrumental analysis, see our spectrophotometers.
JP Selecta measurement technology
Our instrumental developments integrate high-engineering components designed to ensure mechanical stability and repeatability of every rheological test.
- High-resolution torque sensors: precision mechanical torsion systems calibrated to detect infinitesimal resistance variations in non-Newtonian fluids, ensuring ±1 % full-scale accuracy.
- High-precision stepper motors: electronically regulated stepper motors that deliver constant, vibration-free spindle rotation with progressive speed decrease when the analytical cycle stops.
- Advanced thermoregulation systems: external circulation and refrigerated immersion solutions (Frigiterm and Digiterm) that absolutely stabilise sample temperature, a critical factor given that cold drastically increases viscosity.
- Microprocessing and real-time graphical display: direct-read LCD screens that simultaneously show viscosity (cP or Pa·s), spindle, rpm speed, temperature, full-scale percentage and Shear Rate/Shear Stress.
- Precision machining and geometric calibration: blown borosilicate glass with permanent amber-coloured graduations and stamped brass metal cups, calibrated and chrome-plated under strict metrological standards.
- Professional rheology software included: the STS-2025 units store up to 9 working configurations and feature autotest and direct calibration algorithms manageable by the user in 10 languages.
Why choose JP Selecta laboratory viscometers?
Buying a JP Selecta viscometer means integrating the reliability of a leading European manufacturer into your company's quality control, with direct technical support and a traceable calibration certificate that withstands ISO quality audits and pharmaceutical process audits.
Automatic temperature compensation
Since temperature is the physical variable that most alters fluid behaviour, our rotational viscometers ship with an integrated high-resolution Pt100 temperature probe (0.1 °C resolution and ±0.2 °C accuracy). This lets you monitor the sample's thermal behaviour in real time during shearing.
Complete spindle set included with rotational viscometers
Every STS-2025-series laboratory viscometer ships ready to use, including a physical protection support and a complete set of standard stainless steel spindles factory-calibrated geometrically (spindles L1 to L4 for the L series; spindles R2 to R7 for the R and H series).
Specialised technical advice in rheology
Our technical support department will guide you through selecting the right spindle, the proper rpm speed and the correct scale factor based on your sample's behaviour (Newtonian, thixotropic or pseudoplastic), ensuring measurements are always taken in the instrument's optimal torque zone.
Request a personalised quote
Our team of rheology specialists will help you determine the right viscometer type (rotational vs capillary) for your needs. Tell us details such as the nature of fluids to be processed or the viscosity ranges to be measured, and we will analyse your specific case to recommend a tailored configuration.
Frequently asked questions
What warranty do JP Selecta viscometers equipment offer?
All JP Selecta viscometers equipment includes a 2-year warranty, official technical service in Spain, and an international network of certified distributors. We have original spare parts and continuous technical support.
Do you offer calibration service for viscometers equipment?
Yes, JP Selecta offers certified calibration service with international traceability (ISO 17025) for all viscometers equipment. The service can be performed on-site or at our facilities.
How to request a quote for viscometers equipment?
You can request a quote through our website contact form, by email (selecta@jpselecta.es), or by contacting our sales team directly at +34 93 770 08 77. We offer personalized advice.
What is the difference between a rotational viscometer and a capillary one?
The rotational viscometer measures absolute or dynamic viscosity (expressed in cP or mPa·s) by determining the resistance — through torsional force — that a fluid offers to a rotating mechanical spindle; it is ideal for medium-to-high viscosity fluids and non-Newtonian fluids (whose behaviour varies with shear rate). The glass capillary viscometer calculates kinematic viscosity (measured in cSt or mm²/s) from the gravity-driven fall time of a liquid through a calibrated capillary tube, the most precise method for pure Newtonian fluids of low or medium viscosity.
Does a viscometer do the same as a rheometer?
Not exactly. A viscometer is primarily designed as quality control equipment to measure a fluid's viscosity under static conditions or pre-set shear rates. A rheometer is a more advanced analytical instrument that dynamically evaluates the complete viscoelastic properties of a substance by continuously varying Shear Rate and Shear Stress to analyse the structural deformation of complex fluids, gels and semi-solids under changing mechanical stresses.
Does the viscometer software allow exporting flow curves and generating reports valid for audits or ISO/ASTM standards?
Yes — the STS-2025 rotational systems integrate a smart datalogger function and a native USB port, letting you download viscosity, temperature and shear history directly to a flash drive in a structured Excel format, making it easy to create printed reports compliant with quality audit standards.