1. Introduction
The BAOSHISHAN NO.1 Zahn Cup Viscosity Cup (Model M 627) is a stainless steel dip-type viscometer designed for quick and accurate measurement of liquid viscosity. This instrument is suitable for various applications, including paints, inks, varnishes, oils, dyes, sauces, and honey. It adheres to the ASTM D4212 standard, ensuring reliable performance for determining the flow behavior of liquids.
Image 1.1: BAOSHISHAN NO.1 Zahn Cup Viscosity Cup.
2. Product Features
- Material: Constructed from high-quality 304 stainless steel for durability and corrosion resistance.
- Volume: 44ml cup capacity.
- Measurement Range: Designed for liquids with a viscosity range of 5-60 centistokes (cSt).
- Efflux Time: Typical efflux time of 35-80 seconds.
- Standard Compliance: Meets ASTM D4212 standard for viscosity measurement.
- Precision Orifice: Features a precision-drilled orifice for consistent and accurate flow.
- Buckle Balance Ring: Integrated ring helps maintain the cup in a vertical position during measurement, enhancing accuracy.
Image 2.1: Key features of the Zahn Cup, including stainless steel construction, balance ring, nameplate, and outflow hole.
3. Setup
Before using your BAOSHISHAN NO.1 Zahn Cup, ensure it is properly prepared for accurate measurements.
- Unpacking: Carefully remove the Zahn Cup from its packaging. Inspect for any signs of damage during transit.
- Initial Cleaning: Before the first use, and before each subsequent test, clean the cup thoroughly with an appropriate solvent for the liquid to be tested. Wipe it dry with a lint-free cloth. Ensure no residue remains inside the cup or in the orifice.
- Temperature Control: Adjust the temperature of the liquid to be tested to 25°C (77°F) or a specific required temperature. Maintain this temperature consistently throughout the measurement process. Immerse the clean Zahn Cup in the liquid for 1-5 minutes to allow it to reach thermal equilibrium with the sample.
Image 3.1: Cleaning the Zahn Cup with a solvent and cloth before use.
Image 3.2: Immersing the Zahn Cup in the liquid to ensure temperature stability.
4. Operating Instructions
Follow these steps to accurately measure the viscosity of a liquid using the BAOSHISHAN NO.1 Zahn Cup.
- Prepare the Sample: Ensure the liquid sample is at the desired temperature (e.g., 25°C) and thoroughly mixed.
- Immerse the Cup: Dip the clean Zahn Cup vertically into the liquid until the top edge of the cup is submerged. Ensure the cup is completely filled.
- Start Timing: Lift the cup vertically and quickly from the liquid. As soon as the top edge of the cup breaks the liquid surface, start a timer.
- Observe Flow: Keep the cup vertical and maintain a distance of less than 150mm from the liquid surface. Observe the liquid flowing out of the orifice.
- Stop Timing: Stop the timer immediately when the continuous stream of liquid flowing from the orifice breaks for the first time (the first breakpoint).
- Repeat Measurement: Repeat the test 2-3 times to ensure consistency and reduce potential errors. Calculate the average efflux time.
- Viscosity Conversion: Use the provided viscosity conversion formula or table to convert the average efflux time (t) into centistokes (cSt). For Zahn Cup #1, the formula is approximately v = 1.1(t - 29), where 'v' is viscosity in cSt and 't' is efflux time in seconds.
Image 4.1: Visual guide for using the Zahn Cup, including cleaning, temperature control, testing, and conversion.
Image 4.2: Demonstrating the timing of liquid efflux from the Zahn Cup.
Viscosity Conversion Table (for various Zahn Cup sizes)
The following table provides general guidelines for different Zahn Cup sizes. For your NO.1 Zahn Cup, refer to the first column.
Image 4.3: Viscosity conversion table for different Zahn Cup apertures and corresponding applications.
Important Note on Temperature: The viscosity of liquid depends mainly on temperature. Higher temperatures result in lower viscosity. If there is a significant deviation in test values, it is often caused by temperature fluctuations. Therefore, during the test, ensure the temperature is constant and the temperature fluctuation value does not exceed 0.2 °C.
Official Product Video: Viscosity Measurement Demonstration
Video 4.1: This video demonstrates the unpacking, various Zahn Cup sizes, and the process of measuring liquid viscosity using a Zahn Cup. It shows how to immerse the cup, start timing the efflux, and observe the breakpoint for accurate measurement.
5. Maintenance
Proper maintenance ensures the longevity and accuracy of your Zahn Cup.
- Cleaning After Use: Immediately after each use, clean the Zahn Cup thoroughly with an appropriate solvent. This prevents the tested liquid from drying and clogging the orifice.
- Drying: After cleaning, dry the cup completely with a soft, lint-free cloth or by air drying.
- Storage: Store the Zahn Cup in a clean, dry place to prevent contamination and damage. Avoid storing it with corrosive materials.
- Inspection: Periodically inspect the cup and orifice for any signs of wear, damage, or blockages. A damaged orifice can lead to inaccurate readings.
Image 5.1: Cleaning the Zahn Cup after completing viscosity measurements.
6. Troubleshooting
If you encounter issues with your Zahn Cup, consider the following common troubleshooting steps:
- Inconsistent Readings:
- Temperature Fluctuation: Ensure the liquid sample and the cup are at a stable, consistent temperature throughout the test. Even small temperature changes can significantly affect viscosity readings.
- Improper Cleaning: Residue in the cup or orifice can alter flow. Re-clean the cup thoroughly.
- Incorrect Technique: Ensure the cup is lifted vertically and quickly, and timing starts and stops precisely at the breakpoint.
- No Flow or Very Slow Flow:
- Clogged Orifice: Check the orifice for any blockages and clean it carefully.
- Viscosity Too High: The liquid's viscosity might be too high for the NO.1 Zahn Cup. Consider using a Zahn Cup with a larger orifice (e.g., #2, #3, #4, or #5) or thinning the liquid if appropriate for your application.
- Liquid Drips Instead of Flows:
- Viscosity Too Low: The liquid's viscosity might be too low for the NO.1 Zahn Cup, resulting in very rapid flow that is difficult to time accurately.
7. Specifications
| Specification | Detail |
|---|---|
| Model Number | M 627 |
| Zahn Cup Size | NO.1 |
| Material | Stainless Steel |
| Color | Silver |
| Capacity | 44 Milliliters |
| Range of Measurement | 5-60 centistokes (cSt) |
| Efflux Time (typical) | 35-80 seconds |
| Standard | ASTM D4212 |
| Item Weight | 5 ounces |
| Package Dimensions | 14.25 x 2.36 x 1.65 inches |
8. Warranty and Support
For warranty information, technical support, or any inquiries regarding your BAOSHISHAN NO.1 Zahn Cup Viscosity Cup, please contact BAOSHISHAN customer service. Refer to the product packaging or the official BAOSHISHAN website for contact details and specific warranty terms applicable to your region.