GOYOJO Digital Rotary Viscometer Instruction Manual

1. Introduction

The GOYOJO Viscometer is a precision instrument designed for accurately determining the absolute viscosity of Newtonian liquids. It is widely utilized across various industries for measuring the viscosity of a broad range of substances.

1.1 Product Applications

This viscometer is suitable for measuring the viscosity of solvent-based adhesives, emulsions, biochemical products, paints, coatings, cosmetics, lacquers, paper pulp, food, and starch, among others. Its accuracy, speed, intuitive interface, and ease of use make it a preferred choice for professionals.

Figure 1.1: Examples of viscometer applications including cosmetics, biochemicals, and solvent-based adhesives.

Figure 1.2: Further applications such as food testing, paint testing, and latex analysis.

2. Product Overview

2.1 Models and Differences

The GOYOJO Viscometer series includes both pointer and digital display models:

• Pointer Viscometer: Model NDJ-1
• Digital Viscometer: Models NDJ-5S, NDJ-8S, NDJ-9S

The primary differences between these types lie in their display methods (analog pointer vs. digital LCD) and their respective detection ranges.

2.2 Key Components and Features

Figure 2.1: NDJ-8S Digital Rotary Viscometer setup.

Digital Viscometer (NDJ-5S/8S/9S)

Figure 2.2: Labeled components of the NDJ-5S Digital Viscometer.

• Operating Keyboard: For controlling instrument functions.
• Liquid Display: LCD screen for clear display of measurement results (viscosity, speed, rotor number, temperature).
• Rotor Connector: Point of attachment for various rotors.
• Rotors: Interchangeable components for different viscosity ranges.
• Rotor Protection Frame: Guards the rotor during operation.
• Host Base Level Adjustment Knob: For leveling the instrument.
• Temperature Sensor (Optional): Provides real-time temperature display of the measured sample.

Pointer Viscometer (NDJ-1)

Figure 2.3: Labeled components of the NDJ-1 Pointer Viscometer.

• Horizontal Bubble: For ensuring the instrument is level.
• Lifting System: Mechanism for adjusting the height of the viscometer head.
• Coefficient Table: For reading measurement coefficients.
• Aluminum Chassis: Provides effective protection against static electricity.
• Rotors: Interchangeable components for different viscosity ranges.

General Features

• High precision and reliable test results.
• High speed measurement capabilities.
• Ultra-quiet operation.
• High temperature resistant design.
• Durable construction with quality assurance.
• Microcomputer control technology for correct data acquisition.

Figure 2.4: Detailed views of digital viscometer components.

3. Specifications

3.1 Viscosity Measurement Range by Rotor and Speed

Figure 3.1: Viscosity measurement ranges based on rotor and speed settings.

4. Setup

4.1 Unpacking and Inspection

Upon receiving your viscometer, carefully unpack all components and inspect for any damage. Ensure all parts listed in the packing list are present. The package typically includes the viscometer unit, a set of rotors, a rotor protection frame, a power cable, and an instruction manual.

Figure 4.1: Typical package contents for the digital viscometer.

4.2 Assembly Steps

1. Place the viscometer base on a stable, level surface.
2. Attach the main viscometer unit to the stand, ensuring it is securely fastened.
3. **Rotor Installation:**
   1. Put the zero rotor onto the rotor connector.
   2. Slide the sleeve into the fixed set.
   3. Insert the screws and fix them securely.
   4. Ensure the rotor protection frame is correctly positioned around the rotor.
   5. Tighten all screws to ensure stability.
4. **Leveling:** Use the horizontal bubble indicator (for NDJ-1) or the base adjustment knobs (for digital models) to ensure the instrument is perfectly level. Rotate the leveling feet as needed until the bubble is centered.
5. **Power Connection:** Connect the power cable to the viscometer and then to a stable 220V ± 10V power outlet.

Figure 4.2: Rotor assembly diagram.

4.3 Temperature Sensor Installation (Optional)

If your model includes an optional temperature sensor, connect it to the designated port on the viscometer. This allows for real-time temperature monitoring during measurements.

Figure 4.3: Optional temperature sensor.

5. Operating Instructions

5.1 Basic Operation (Digital Models NDJ-5S/8S/9S)

1. Power On: Turn on the viscometer using the power switch located on the back panel. The LCD will illuminate.
2. Select Rotor: Based on the expected viscosity of your sample, select the appropriate rotor (#0, #1, #2, #3, or #4). Refer to the viscosity range table in Section 3.1. Install the selected rotor as described in Section 4.2.
3. Prepare Sample: Pour the liquid sample into a suitable beaker. Ensure the sample volume is sufficient to fully immerse the rotor up to the marked line.
4. Immerse Rotor: Carefully lower the viscometer head using the lifting system until the rotor is immersed in the sample. Ensure the rotor is centered and not touching the sides or bottom of the beaker.
5. Set Speed: Use the 'REVS' buttons (up/down arrows) on the control panel to select the desired rotational speed (0.3, 0.6, 1.5, 3, 6, 12, 30, 60 rpm).
6. Start Measurement: Press the 'RUN' button to begin the measurement. The rotor will start rotating, and the LCD will display real-time viscosity, speed, rotor number, and temperature (if sensor is connected).
7. Read Results: Allow the reading to stabilize. The stable value displayed on the LCD is the absolute viscosity of the sample.
8. Stop Measurement: Press the 'STOP' button to halt the rotor rotation.
9. Remove Rotor: Gently raise the viscometer head and remove the rotor for cleaning.

Figure 5.1: Digital viscometer displaying real-time temperature during operation.

Figure 5.2: Examples of the running and stop screens on the digital display.

5.2 Basic Operation (Pointer Model NDJ-1)

1. Power On: Turn on the viscometer.
2. Select Rotor: Choose the appropriate rotor based on the sample's expected viscosity and install it.
3. Prepare Sample: Place the liquid sample in a beaker.
4. Immerse Rotor: Lower the rotor into the sample, ensuring it is fully immersed and centered.
5. Start Measurement: Engage the rotation mechanism.
6. Read Results: When the pointer is stable, press the pointer control lever to read the viscosity value from the scale. Use the coefficient table to calculate the absolute viscosity.
7. Stop Measurement: Disengage the rotation.
8. Remove Rotor: Raise the viscometer head and remove the rotor for cleaning.

6. Maintenance

• Cleaning: After each use, thoroughly clean the rotors and the rotor protection frame with an appropriate solvent that will not damage the materials. Ensure no residue remains.
• Storage: Store the viscometer and its accessories in a clean, dry, and dust-free environment. Keep rotors in their protective case when not in use.
• Handling: Handle the viscometer and its delicate rotors with care to prevent bending or damage, which can affect measurement accuracy.
• Calibration: Regular calibration by qualified personnel is recommended to maintain measurement accuracy over time.

7. Troubleshooting

• No Power: Check the power cable connection and ensure the power switch is in the 'ON' position. Verify the power outlet is functional.
• Inaccurate Readings:
  • Ensure the instrument is perfectly level.
  • Verify the correct rotor is selected for the sample's viscosity range.
  • Check that the rotor is clean and undamaged.
  • Ensure the rotor is fully immersed and not touching the beaker walls or bottom.
  • Confirm the sample temperature is stable and accounted for (if using a temperature sensor).
• Rotor Not Rotating: Check for obstructions around the rotor. Ensure the rotor is correctly installed and the power is on.
• Display Issues (Digital Models): If the LCD is blank or showing errors, power cycle the device. If the issue persists, contact support.

8. User Tips

• Paint Viscosity: This viscometer is suitable for measuring the viscosity of paints, as indicated by its wide range of applications.
• Power Supply: The specified power supply is 220V ± 10V. If operating in a region with 110V mains power, a suitable voltage converter will be required.
• Sample Preparation: Always ensure your sample is free of air bubbles and at a consistent temperature for the most accurate readings.
• Rotor Selection: When in doubt, start with a smaller rotor and lower speed, gradually increasing as needed to find a stable reading within the instrument's range.

9. Warranty and Support

The GOYOJO Viscometer is manufactured with a commitment to quality assurance. For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your original point of purchase or the manufacturer's customer support. Please have your model number and purchase date available when contacting support.