Overview
The Tu-4 Viscometer (model: TND-4T) is an instrument for the measurement of the viscosity of conditioned liquids such as Coatings. It characterizes viscosity by measuring the time it takes for a volume of specimen to flow out of a specific aperture at a specified temperature. The results are expressed in seconds and can be converted to kinematic viscosity values according to standard formulas.
Features
1. The cup body is made of pure copper, and the bottom outflow hole is made of stainless steel, with a durable structure.
The geometric dimensions and inner wall asperity strictly comply with the provisions of the national standard GB/T 1723.
Equipped with a correction factor K (range of 1 +/- 0.03) to ensure the accuracy and comparability of measurement results, and need to be regularly corrected.
The capacity is about 100 ml, the diameter of the flow hole is 4 mm, and the measurement time range is 0 to 150 seconds.
Principle
Tu-4 Viscometer measurement is conditional viscosity. The principle is the measurement of the time required for a sample of a certain volume (about 100ml) to completely flow out through an outflow hole of a specified diameter (4mm) at the bottom of the instrument at a specified temperature. This outflow time can be converted into a kinematic viscosity value (mm ²/s) by the standard formula.
Applications
Coating viscosity determination
Steps
1. Prepare the sample and control it to the specified temperature.
2. Viscometer cleaning and drying.
3. Plug the outflow hole with a hole plugging rod, and pour the sample into the viscosity cup until the cup is full.
4. Quickly remove the plug rod and start timing at the same time.
5. Observe the filament flow of the sample, and immediately stop counting when it first stops flowing, and record the outflow time (seconds).
6. According to the outflow time range, choose the corresponding formula to convert the outflow time t (s) into kinematic viscosity μ (mm ²/s).
7. Regularly use standard viscosity fluid to calibrate the instrument, and multiply the measured viscosity by the correction factor K to obtain the conditional viscosity.
Notice
• Make sure Viscometer is clean and drying before use.
• Measurements must be made under specified thermostatic conditions.
• Avoid bubbles when pouring samples.
• Remove the plug rod and start the timer synchronously.
• The instrument correction factor K should be kept within the range of 1 +/- 0.03, beyond this range, consider replacing the Viscometer.
• Viscometers should be regularly calibrated according to Frequency of Use.
• When using standard viscosity fluid calibration, the difference between the measured outflow time and the calculated value should be within +/- 3% of the calculated value.
