Portable Viscometer NIP-PRV3800 - Advantages:

1. Purpose and scope

This procedure describes the determination of dynamic viscosity in centipoise (cP) for paints, coatings, oils and other Newtonian or near-Newtonian fluids using the Portable Viscometer NIP-PRV3800. The method is based on the general principles of digital rotational viscometry, adapted for mobile laboratory and field use.

2. Equipment and materials

• Portable Viscometer NIP-PRV3800 with calibrated spindle/rotor assembly

• Stainless steel sample cup with a smooth inner wall and defined geometry

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

• Lint-free cloths and suitable Cleaning solution

• Certified reference viscosity fluid (optional for calibration testing)

3. Preparation

1. Ensure that the NIP-PRV3800 is clean and that the spindle rotates freely.

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

3. Bring the sample to the prescribed temperature and allow it to stabilize.

4. Gently homogenize the sample, avoiding the introduction of air bubbles.

5. Fill the stainless steel cup up to the marked immersion depth of the spindle.

4. Device settings

1. The Portable Viscometer NIP-PRV3800 turn on.

2. The cP measurement mode choose.

3. Check spindle type and speed.

4. If indicated, reset the device to zero.

5. Position the viscometer vertically above the sample cup.

5. Test procedure

Step 1 — Immersion

Lower the spindle into the sample until the immersion mark is completely covered. Avoid contact with the beaker wall or bottom.

Step 2 — Measurement

Press START. The NIP-PRV3800 rotates the spindle at a defined speed. The internal torque sensor detects the rotational resistance and converts it into dynamic viscosity (cP) um.

Step 3 — Stabilization

Let the display stabilize (typical) 5–10 secondsThe microcontroller filters out short-term torque fluctuations and calculates a stable measured value.

Step 4 — Reading

The following data is documented:

• Viscosity (cP)

• Spindle type and speed

• Sample temperature

• Deviations from standard conditions

Step 5 — Conclusion

Lift the instrument vertically out of the sample to avoid splashing. Press STOP. Immediately clean the spindle with solvent and lint-free cloths.

6. Calculation and documentation

The NIP-PRV3800 automatically calculates the viscosity based on internal calibration constants. For documentation purposes:

• Sample designation

• Measuring temperature

• Spindle type and speed

• Measured viscosity (cP)

• Optional: Density or shear rate data, if required.

7. Quality control

• Repeat measurement if the deviation ±0.5 % exceeds the mean.

• Weekly calibration testing with certified reference fluids.

• Ensure uniform cup geometry, filling height and immersion depth.

8. Safety and handling

Wear protective gloves and safety goggles when handling solvent-containing samples. Dispose of cleaning agents in accordance with local regulations.

9. Notes

This procedure represents a mobile implementation of digital rotational viscometry The torque sensor and temperature compensation of the NIP-PRV3800 enable precise viscosity measurements both in the laboratory and in the field.