Bonvoisin Digital Rotary Viscometer NDJ-8T User Manual

1. Introduction

This manual provides detailed instructions for the safe and effective operation of the Bonvoisin Digital Rotary Viscometer, model NDJ-8T. This instrument is designed for precise measurement of both apparent viscosity of non-Newtonian fluids and absolute viscosity of Newtonian fluids. It is suitable for various applications including solvent-based adhesives, paints, inks, oils, milkshakes, honey, and cosmetics.

Please read this manual thoroughly before operating the viscometer to ensure correct usage and to prevent damage to the instrument or inaccurate results.

2. Safety Information

Adherence to safety precautions is crucial for preventing personal injury and equipment damage. Always follow standard laboratory safety procedures.

• Ensure the viscometer is placed on a stable, level surface.
• Connect the instrument to a grounded power outlet with the correct voltage (100-240V).
• Do not operate the viscometer in environments with corrosive gases or high humidity.
• Handle rotors with care to avoid bending or damage, which can affect measurement accuracy.
• Always turn off and unplug the instrument before cleaning or performing maintenance.
• Keep liquids away from electrical components.

3. Package Contents

Verify that all items listed below are present in your package:

• Bonvoisin Digital Rotary Viscometer (Main Unit)
• Carrying Case
• 4 Rotors (No. 1, 2, 3, and 4)
• Temperature Probe
• USB to RS232 Cable
• Lifting Rod
• Base (Tripod)
• 100-240V Power Adapter/Charger
• Calibration Certificate

4. Product Overview and Components

The Bonvoisin NDJ-8T viscometer features a touch screen display for intuitive operation and precise control over viscosity measurements.

Key Components:

• Main Unit: Houses the motor, control electronics, and touch screen display.
• Rotors: Four interchangeable rotors (No. 1, 2, 3, 4) for different viscosity ranges.
• Temperature Probe: For real-time temperature monitoring of the sample.
• Lifting Rod & Base (Tripod): Provides stable support and allows for height adjustment of the viscometer head.
• Touch Screen Display: Shows spindle number, speed, temperature, time, viscosity value (mPa.s), and % torque.
• Data Output Interface: USB port for connecting to a PC for data storage and analysis.

5. Setup

5.1 Assembly

1. Place the tripod base on a stable, level surface. Adjust the bottom screws of the tripod to ensure the machine is perfectly level.
2. Insert the lifting rod into the hole on the tripod base and secure it.
3. Attach the viscometer main unit to the lifting rod using the bracket fixing knob. Ensure it is securely fastened.
4. Connect the temperature probe to the "PROBE" interface on the back of the viscometer.
5. Connect the power adapter to the viscometer and then to a suitable power outlet (100-240V).

6. Operation

6.1 Power On/Off

• To power on, press the power switch located on the back of the main unit.
• To power off, press the power switch again.

6.2 Touch Screen Interface

The touch screen displays key measurement parameters and allows for easy control.

• Spindle: Indicates the currently selected rotor number.
• Speed: Displays the rotational speed in RPM.
• Temperature: Shows the real-time sample temperature in °C (if probe is connected).
• Time: Measurement duration.
• Visc. (mPa.s): Displays the measured viscosity value.
• F.S. (% torque): Indicates the percentage of full scale torque. For optimal accuracy, this value should be between 15% and 85%, with around 50% being ideal.
• Run/Stop/Print: Control buttons for starting, stopping, and printing measurements.

6.3 Rotor Selection and Installation

Select the appropriate rotor based on the expected viscosity range of your sample. The NDJ-8T comes with 4 rotors (No. 1, 2, 3, 4) and offers 8 speeds (0.3, 0.6, 1.5, 3, 6, 12, 30, 60 rpm), providing 32 combinations for various measurement needs. Rotor 0# (not included, but mentioned in product description) can measure viscosity as low as 1mPa.s.

To install a rotor:

1. Gently screw the selected rotor onto the bottom of the viscometer spindle. Ensure it is finger-tight.
2. Lower the viscometer head using the lifting mechanism until the rotor is fully immersed in the sample liquid, with the liquid level reaching the mark on the rotor shaft. Ensure the rotor protection is in place to prevent accidental contact.

6.4 Measurement Procedure

1. Prepare your sample in a suitable beaker or container.
2. Install the appropriate rotor and immerse it in the sample as described in Section 6.3.
3. Ensure the temperature probe is immersed in the sample for accurate temperature readings.
4. On the touch screen, select the desired rotor number and rotational speed.
5. Press the "Run" button to start the measurement.
6. Allow the reading to stabilize. Monitor the % torque value; it should ideally be between 15% and 85%. If it's outside this range, adjust the rotor or speed.
7. Once stable, record the viscosity value (mPa.s) and temperature.
8. Press the "Stop" button to end the measurement.

6.5 Data Output

The viscometer can store up to 20 records internally. When the 21st record is stored, the first record is automatically deleted. For unlimited data storage and analysis, connect the viscometer to a computer.

To connect to a PC:

1. Use the provided USB to RS232 cable to connect the viscometer's RS232 interface to your computer.
2. Install the necessary software drivers and application (compatible with Windows 7, XP, 10) on your PC.
3. Follow the software instructions to establish communication and begin data logging.

7. Maintenance

7.1 Cleaning

• After each use, carefully remove the rotor and clean it thoroughly with an appropriate solvent for the sample material. Ensure no residue remains.
• Wipe the main unit and display screen with a soft, damp cloth. Avoid using abrasive cleaners or solvents that could damage the plastic or screen.
• Ensure all components are dry before storage.

7.2 Storage

• Store the viscometer and its accessories in the provided carrying case in a clean, dry, and temperature-controlled environment.
• Avoid storing in direct sunlight or areas with extreme temperatures or humidity.
• Keep rotors separate and protected to prevent bending or damage.

8. Troubleshooting

9. Specifications

10. Warranty and Support

Bonvoisin products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact Bonvoisin customer service. Refer to your purchase documentation for specific warranty terms and contact details.

When contacting support, please have your product model (NDJ-8T) and purchase date available.