JFDVT01 vs. JFDVT Series Rotary Viscometer: Full Comparison & User Guide

U.S. Solid Rotary Viscometers: Classic JFDVT vs. Touchscreen JFDVT01 – A Complete Guide

U.S. Solid offers two lines of rotary viscometers designed for professional viscosity measurement: the classic JFDVT series (LCD display) and the upgraded JFDVT01 series (5" touchscreen). Both instruments measure the viscosity of Newtonian and non-Newtonian fluids across a wide range of industries — from paints and coatings to food, pharmaceuticals, and adhesives. But which one is right for your lab? This guide breaks down the key differences and walks you through how to use either instrument effectively.

Series Overview

JFDVT Series — Classic LCD Rotary Viscometer

The JFDVT series is U.S. Solid's entry-level professional viscometer. It features a traditional LCD display, fixed-speed rotor control, and a straightforward button-operated interface. It is well-suited for routine quality control tasks where simplicity and reliability are the priority.

  • Measurement range: 10 – 2,000,000 mPa·s (model dependent)
  • Accuracy: ±2% (Newtonian fluids)
  • Rotor speeds: Fixed steps — 0.3, 0.6, 1.5, 3 rpm
  • Display: LCD
  • Interface: RS232 (select models)
  • Temperature probe: Available on select models
  • Data storage: Not available
  • Operating system: Standard embedded controller

JFDVT01 Series — Touchscreen Upgrade Rotary Viscometer

The JFDVT01 series is a significant engineering upgrade over the classic JFDVT. It replaces the button interface with a 5-inch full-color touchscreen, runs on an ARM + Linux platform, and delivers twice the measurement accuracy. It is designed for labs that require advanced data management, real-time curve visualization, and flexible test programming.

  • Measurement range: 10 – 320,000,000 mPa·s (model dependent)
  • Accuracy: ±1% (Newtonian fluids), repeatability ±0.5%
  • Rotor speeds: Stepless, 0.1–200 rpm across 998–2,000 selectable steps
  • Display: 5" full-color touchscreen
  • Interface: RS232 + USB (all models)
  • Temperature probe: Optional on all models
  • Data storage: 30 sets onboard
  • Test programs: 30 custom programs
  • Operating system: ARM + Linux

Side-by-Side Comparison

Feature JFDVT Series (Classic) JFDVT01 Series (Upgrade)
Display LCD 5" Full-Color Touchscreen
Measurement Accuracy ±2% (Newtonian) ±1% (Newtonian), ±0.5% repeatability
Speed Control Fixed steps (0.3 / 0.6 / 1.5 / 3 rpm) Stepless, 0.1–200 rpm (998–2,000 steps)
Data Output RS232 (select models) RS232 + USB (all models)
Data Storage None 30 sets onboard
Test Programs None 30 custom programs
Real-Time Curve Display No Yes (viscosity vs. time; shear rate vs. viscosity)
Auto Scan Function No Yes — auto-recommends optimal rotor & speed
Front Bubble Level Standard Front-mounted for quick alignment
Operating System Standard embedded ARM + Linux
Temperature Probe Select models only Optional on all models
Power Supply AC 110V ±10%, 60Hz ±10% AC 110V/60Hz or AC 220V/50Hz
Working Environment 5°C–35°C, ≤80% RH 5°C–35°C, ≤80% RH

Which Series Should You Choose?

📋 JFDVT Classic Series

Reliable · Budget‑friendly

Choose the JFDVT Classic Series if:

  • You need a reliable, straightforward viscometer for routine QC checks
  • Your application requires only a few fixed speed settings
  • Budget is a primary consideration and advanced data logging is not required
  • You are measuring standard fluids where ±2% accuracy is sufficient

📱 JFDVT01 Touchscreen Series

High‑performance · Smart

Choose the JFDVT01 Touchscreen Series if:

  • You need higher accuracy (±1%) and better repeatability (±0.5%) for R&D or compliance testing
  • Your workflow requires custom test programs, real-time curve visualization, or USB data export
  • You work with a wide variety of fluids and need stepless speed control to fine-tune measurements
  • You want the Auto Scan function to quickly identify the optimal rotor and speed for unknown samples
  • You need dual-voltage compatibility (110V/220V) for international use

Step-by-Step User Guide

The following instructions apply to both series. Notes specific to the JFDVT01 are indicated where applicable.

  1. Instrument Placement — Place the viscometer on a stable, clean, dry, fireproof, and non-slip surface. Keep it away from corrosive gases, strong magnetic fields, and sources of vibration. Ensure adequate clearance around the instrument for rotor installation and sample container access.
  2. Leveling — Rotate the base leveling screws until the bubble in the level indicator is centered. Recheck the level after installing the protective frame. (JFDVT01: The front-mounted bubble level makes this step faster and easier to verify at a glance.)
  3. Rotor Selection — Select the appropriate rotor based on the expected viscosity range of your sample. If the viscosity is unknown, start with a lower-numbered rotor (e.g., R2) at low speed and adjust gradually. Refer to the Measurement Range Table in the user manual for each rotor's specific viscosity range.
    (JFDVT01 only: Use the Auto Scan function to let the instrument automatically recommend the optimal rotor and speed combination for your sample.)
  4. Sample Preparation — Ensure the sample is at a stable, controlled temperature before measurement. Temperature directly affects viscosity readings — even small fluctuations can introduce significant error. Use a temperature-controlled bath or the optional temperature probe (available on select JFDVT models and all JFDVT01 models) to monitor sample temperature throughout the test.
  5. Rotor Installation — Attach the selected rotor to the instrument coupling using the provided wrench. Immerse the rotor in the sample liquid to the required depth mark. Ensure the rotor is centered in the sample container and free of air bubbles.
  6. Speed Setting & Measurement
    JFDVT Classic: Use the control buttons to select one of the fixed speed settings (0.3, 0.6, 1.5, or 3 rpm). Power on and allow the reading to stabilize before recording.
    JFDVT01: Use the 5" touchscreen to set any speed between 0.1 and 200 rpm across 998 or 2,000 selectable steps. Select a saved test program or configure a new one. The real-time viscosity curve will display on screen as the measurement progresses.
  7. Reading & Recording Data — Wait for the reading to stabilize, then record the viscosity value displayed. (JFDVT01: Data is automatically stored in onboard memory — up to 30 sets. Export directly via USB drive or transfer to a computer or printer via RS232.)
  8. Rotor Cleaning — After each measurement, disassemble the rotor and clean it thoroughly with a suitable organic solvent. Do not immerse the instrument body in liquid. Store rotors in the provided case to prevent damage.

Tips for Accurate Measurements

  • Control temperature strictly — viscosity is highly temperature-sensitive. Always record the sample temperature alongside the viscosity reading.
  • Avoid air bubbles — bubbles on or near the rotor will cause erratic readings. Gently stir the sample before immersing the rotor.
  • Keep the rotor centered — off-center rotation introduces mechanical error. Ensure the sample container is properly positioned.
  • Allow stabilization time — let the rotor spin for at least 30–60 seconds before recording a reading, especially for high-viscosity samples.
  • Use the correct rotor — a rotor that is too large for the viscosity range will overload the instrument; one that is too small will produce inaccurate low-torque readings.

Conclusion

Both the JFDVT and JFDVT01 series deliver reliable, professional-grade viscosity measurement backed by U.S. Solid's commitment to precision instrumentation. The classic JFDVT is an excellent choice for straightforward, budget-conscious applications, while the JFDVT01 represents a meaningful step up for labs that demand higher accuracy, advanced data management, and greater measurement flexibility. Whichever series you choose, following the setup and measurement best practices outlined above will ensure consistent, repeatable results.

Explore the Full Range of Rotary Viscometers

Visit U.S. Solid to find the model that matches your viscosity range and application requirements.

Browse JFDVT Series →
© 2026 U.S. Solid — Precision Lab Instruments
Voltar ao blog