Mobile Viscometer
Portable Viscometer
Portable Rotational Viscometer
Portable Spindle Viscometer
Precision Mobile Viscometr
Precision Portable Viscometr
Expert Viscosity Measurement in the field
ASTM D2196 ISO 1652
ISO 2555 BS 3900

Portable Viscometer QPI‑PRV3800 - Application:

1. Purpose and Scope

This procedure describes how to determine the dynamic viscosity in centipoise (cP) for paints, coatings, oils, and other Newtonian or near‑Newtonian fluids using the Portable Viscometer QPI‑PRV3800. The method follows the general principles of digital rotational viscometry, adapted for portable field and laboratory use.

2. Equipment and Materials

• Portable Viscometer QPI‑PRV3800 with calibrated spindle

• Stainless‑steel sample cup with smooth interior and defined geometry

• Temperature‑controlled environment (recommended: 25 ± 0.5 °C)

• Lint‑free wipes and compatible cleaning solvent

• Certified reference viscosity fluid (optional, for calibration verification)

3. Preparation

1. Inspect the QPI‑PRV3800 to ensure the spindle rotates freely and is free of residue.

2. If required, verify calibration using a certified reference fluid.

3. Bring the test sample to the specified temperature and allow it to equilibrate.

4. Mix the sample gently to eliminate gradients without introducing air bubbles.

5. Fill the stainless‑steel cup to the immersion mark corresponding to the selected spindle.

4. Instrument Preparation

1. Power on the Portable Viscometer QPI‑PRV3800.

2. Select the cP measurement mode.

3. Confirm the correct spindle type and rotational speed.

4. Zero the instrument if prompted.

5. Hold the viscometer vertically above the prepared sample cup.

5. Test Procedure

Step 1 — Immersion

Lower the spindle into the sample until the immersion mark is fully submerged. Ensure the spindle does not touch the cup walls or bottom.

Step 2 — Measurement

Press START. The QPI‑PRV3800 rotates the spindle at a controlled speed. The internal torque sensor measures resistance to rotation, which is converted into dynamic viscosity (cP).

Step 3 — Stabilization

Allow the reading to stabilize, typically within 5–10 seconds. The instrument’s microcontroller filters transient torque variations and calculates a steady‑state viscosity value.

Step 4 — Reading

Record the following:

• Viscosity (cP)

• Spindle type and rotational speed

• Sample temperature

• Any deviations from standard test conditions

Step 5 — Completion

Lift the viscometer vertically to avoid splashing. Press STOP. Clean the spindle immediately using solvent and lint‑free wipes.

6. Calculations and Reporting

The QPI‑PRV3800 automatically converts torque to viscosity using internal calibration constants. For reporting, document:

• Sample identification

• Test temperature

• Spindle type and speed

• Measured viscosity (cP)

• Optional: density or shear‑rate information if required by the test specification

7. Quality Control

• Repeat measurements if variation exceeds ±0.5 % of the mean value.

• Verify calibration weekly using certified reference fluids.

• Maintain consistent cup geometry, fill height, and immersion depth for reproducibility.

8. Safety and Handling

Wear gloves and eye protection when handling solvent‑based materials. Dispose of cleaning agents according to local regulations.

9. Notes

This procedure provides a portable adaptation of digital rotational viscometry. The QPI‑PRV3800’s torque sensor and temperature compensation enable accurate viscosity measurement in both laboratory and field environments.