Bonvoisin Lab Analytical Balance 500g x 0.001g Instruction Manual

1. Introduction

This manual provides detailed instructions for the safe and efficient operation, setup, and maintenance of your Bonvoisin Lab Analytical Balance 500g x 0.001g. Please read this manual thoroughly before using the device to ensure proper functionality and to prevent damage.

2. Safety Information

• Place the balance on a stable, level surface away from vibrations, drafts, and direct sunlight.
• Avoid placing the balance near strong electromagnetic fields or heat sources.
• Do not overload the balance beyond its maximum capacity of 500g.
• Keep the balance clean and dry. Avoid spilling liquids on the device.
• Use only the provided power adapter.
• Ensure the integrated windshield is properly closed during weighing to minimize environmental interference.

3. Package Contents

Verify that all items are present in the package:

• Bonvoisin Lab Analytical Balance
• Power Adapter
• Instruction Manual
• Calibration Weight (200g)

4. Product Overview

The Bonvoisin Lab Analytical Balance is designed for precise measurements in laboratory and scientific settings. Key features include:

• High Precision: 0.001g readability with a maximum weighing capacity of 500g.
• Integrated Windshield: Provides protection against environmental factors for stable readings.
• Rechargeable Lithium Battery: Offers up to 36 hours of continuous operation, allowing for portable use.
• RS232 Interface: Enables data exchange with computers or micro-printers.
• Customizable Units: Select from 17 different weighing units, with the option to disable unused units.

Figure 4.1: Front view of the Bonvoisin Lab Analytical Balance.

Figure 4.2: The integrated windshield design enhances stability and reduces environmental impact on measurements.

5. Setup

1. Unpacking: Carefully remove the balance and all accessories from the packaging.
2. Placement: Place the balance on a firm, level, and vibration-free surface. Ensure it is away from air currents (e.g., vents, open windows) and direct heat sources.
3. Power Connection: Connect the provided power adapter to the balance and plug it into a suitable power outlet. The balance can also operate on its internal rechargeable lithium battery.
4. Warm-up: Allow the balance to warm up for at least 15-30 minutes after connecting to power before performing any measurements. This ensures optimal accuracy and stability.
5. Leveling: Adjust the leveling feet at the bottom of the balance until the bubble in the spirit level (usually located on the front or side) is centered.

6. Operation

6.1. Basic Weighing

1. Turn on the balance by pressing the ON/OFF button.
2. Wait for the display to show "0.000g" and stabilize.
3. If using a container, place the empty container on the weighing pan. Press the TARE button to zero the display.
4. Carefully place the item to be weighed into the container or directly onto the weighing pan.
5. Read the stable weight displayed on the screen.

Figure 6.1: Step-by-step guide for accurate weighing with tare function.

6.2. Calibration

The balance is multi-point calibrated before shipping. For optimal accuracy, periodic calibration is recommended.

1. Ensure the weighing pan is empty and the balance is stable.
2. Press and hold the CAL button until "CAL" appears on the display.
3. The display will then show the required calibration weight (e.g., "200g").
4. Carefully place the included 200g calibration weight onto the center of the weighing pan.
5. The balance will automatically calibrate. Once complete, it will return to normal weighing mode, displaying "0.000g".
6. Remove the calibration weight.

Figure 6.2: Calibration process using the provided weight.

6.3. Unit Selection and Customization

The balance supports 17 different weighing units. You can cycle through them or customize which units are active.

1. Press the UNIT button to cycle through the available units (g, ct, oz, ozt, lb, kg, dr, gn, m, mm, tlJ, tlt, tlh, gsm, tmr, TAR, PKT).
2. To customize units (turn off unused ones), refer to the advanced settings section in the full digital manual (if provided separately) or contact customer support. This feature allows for quicker unit switching by only displaying relevant units.

Figure 6.3: The balance offers 17 selectable units for various applications.

6.4. RS232 Interface

The RS232 interface allows for serial data exchange with external devices like computers or micro-printers.

• Connecting to a Printer:
  1. Use a suitable RS232 cable (e.g., male RS232 to female RS232) to connect the balance to your serial printer.
  2. Adjust the scale and printer to the same baud rate (default is typically 9600 bps) and select a suitable output mode (e.g., continuous output).
• Connecting to a Computer:
  1. Connect the balance to your PC using a USB to RS232 data cable (not included).
  2. Download and install the necessary PL2303 driver software for your operating system.
  3. Set communication parameters: Baud rate 9600 bps, Data format: 10 bits (0 as start bit, 1 as stop bit, 8 digits ASCII code). No adjustment for odd or even parity is required.
  4. Data output mode can be configured for continuous output, press output, or timing output.

Figure 6.4: Connecting the balance to a printer for data output.

Figure 6.5: Connecting the balance to a computer for data analysis.

7. Maintenance

• Cleaning: Use a soft, damp cloth with mild detergent to clean the exterior of the balance. Do not use abrasive cleaners or solvents. Ensure no liquid enters the device.
• Weighing Pan: The stainless steel weighing pan can be removed for cleaning. Handle with care to avoid bending or damaging it.
• Storage: When not in use for extended periods, store the balance in a dry, dust-free environment.
• Battery Care: For models with a rechargeable battery, avoid fully discharging the battery frequently to prolong its lifespan. Charge regularly.

8. Troubleshooting

9. Specifications

• Model: 500g, 0.001
• Readability: 0.001g
• Maximum Weighing Capacity: 500g
• Minimum Weighing: 10mg
• Accuracy: +/- 0.004g
• Weighing Units: 17 selectable units (g, ct, oz, ozt, lb, kg, dr, gn, m, mm, tlJ, tlt, tlh, gsm, tmr, TAR, PKT)
• Display Type: LCD
• Power Source: AC adapter, Internal Lithium Polymer battery (included)
• Battery Life: Approximately 36 hours continuous operation on full charge
• Interface: RS232
• Product Dimensions: 11 x 8.6 x 7 inches
• Product Weight: 4.74 Pounds

Figure 9.1: Key performance parameters of the analytical balance.

Figure 9.2: Physical dimensions of the balance.

10. Warranty and Support

Bonvoisin products are designed for quality and reliability. For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official Bonvoisin website. Please have your model number (500g, 0.001) and purchase date ready when contacting support.