1. Introduction
The Bante 820 Portable Dissolved Oxygen Meter is designed for accurate measurement of dissolved oxygen concentration (mg/L) and percentage saturation in various water samples. This device features automatic temperature compensation, adjustable salinity and barometric pressure compensation, and data storage capabilities, making it suitable for field and laboratory applications.
Key Features:
- High-accuracy dissolved oxygen measurement.
- 1 or 2 points calibration using air-saturated water or zero oxygen solution.
- Adjustable salinity and barometric pressure compensation.
- Automatic temperature compensation.
- Auto-lock measurement endpoint.
- 100 sets of data storage.
- USB communication interface for data transfer and power.
Image 1.1: The Bante 820 Portable Dissolved Oxygen Meter with its probe connected. This image displays the meter's main unit, the connected dissolved oxygen probe, and the digital display showing a reading of 8.20 mg/L and 25.0 °C.
2. Setup
2.1 Unpacking and Inspection
Carefully unpack the Bante 820 meter and all accessories. Verify that all components listed below are present and undamaged:
- Bante 820 Meter
- Dissolved Oxygen Probe
- Electrolyte Solution (30 mL)
- Membrane Cap
- Carrying Case
Image 2.1: Contents of the Bante 820 carrying case. The image shows the meter, electrolyte solution, polarographic electrode, and membrane cap neatly organized within a protective carrying case.
2.2 Battery Installation
The meter operates on 3 x 1.5V AA batteries. To install:
- Locate the battery compartment cover on the back of the meter.
- Slide the cover open.
- Insert three AA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
Image 2.2: The battery compartment of the Bante 820 meter. The image shows the back of the meter with the battery cover open, revealing slots for three AA batteries.
2.3 Probe Connection
Connect the dissolved oxygen probe to the meter:
- Locate the DIN socket on the top of the meter.
- Align the probe connector with the DIN socket.
- Gently push and twist the connector clockwise until it is securely fastened.
Image 2.3: Top and bottom connectors of the Bante 820 meter. The top view shows the DIN socket for the dissolved oxygen electrode connection, and the bottom view shows the USB communication interface for data transfer or power connection.
2.4 Preparing the Dissolved Oxygen Probe
Before first use or after prolonged storage, the dissolved oxygen probe requires preparation:
- Unscrew the existing membrane cap from the probe.
- Fill the new membrane cap with the provided electrolyte solution, ensuring no air bubbles are trapped.
- Carefully screw the membrane cap onto the probe, ensuring the membrane is taut and free of wrinkles.
- Allow the probe to stabilize for at least 15-30 minutes before calibration or measurement.
Image 2.4: Components of the Bante 820 Dissolved Oxygen Electrode. The image displays the dissolved oxygen probe, a replacement membrane cap, and a bottle of electrolyte solution.
3. Operating Instructions
3.1 Powering On/Off
- To power on, press the ON/OFF button.
- To power off, press and hold the ON/OFF button until the display turns off. The meter also features an auto-power off function, which can be configured in the setup menu.
3.2 Calibration
Calibration is crucial for accurate measurements. The Bante 820 supports 1 or 2 points calibration.
- Air-Saturated Water Calibration (1-point):
- Immerse the probe in air-saturated water (e.g., tap water stirred vigorously for several minutes).
- Press the CAL button. The meter will display 'CAL1' and begin calibration.
- Wait for the reading to stabilize. The meter will automatically confirm calibration.
- Zero Oxygen Solution Calibration (2-point, optional):
- After air-saturated water calibration, immerse the probe in a zero oxygen solution.
- Press the CAL button again. The meter will display 'CAL2' and begin the second point calibration.
- Wait for the reading to stabilize. The meter will automatically confirm calibration.
3.3 Measurement
- Ensure the probe is properly calibrated.
- Immerse the dissolved oxygen probe into the sample solution. Ensure the membrane is fully submerged and free of air bubbles.
- Gently stir the probe to ensure a representative sample and stable reading.
- The meter will display the dissolved oxygen concentration (mg/L) and temperature (°C). Press the MODE button to switch between mg/L and % saturation.
- The auto-lock measurement endpoint feature will stabilize the reading and hold it on the display.
3.4 Data Storage and USB Communication
- To store a measurement, press the SAVE button. The meter can store up to 100 sets of data.
- To retrieve stored data, navigate through the menu using the arrow buttons.
- Connect the meter to a computer using a USB cable via the USB communication interface (refer to Image 2.3) for data transfer or to power the device.
4. Maintenance
4.1 Probe Cleaning
Regular cleaning of the dissolved oxygen probe is essential for accurate readings:
- Rinse the probe with distilled water after each use.
- If the membrane is fouled, gently clean it with a soft cloth or cotton swab. Avoid abrasive materials.
- If severe fouling occurs, replace the membrane cap and electrolyte solution.
4.2 Membrane Cap and Electrolyte Solution Replacement
The membrane cap and electrolyte solution should be replaced periodically (e.g., every 1-3 months, or if readings become unstable/inaccurate). Follow the steps in Section 2.4 for replacement.
4.3 Battery Replacement
When the low battery indicator appears on the display, replace the batteries as described in Section 2.2.
4.4 Storage
When not in use, store the probe with its protective cap on, filled with electrolyte solution, or in a damp environment to prevent the membrane from drying out. Store the meter and probe in the provided carrying case in a cool, dry place.
5. Troubleshooting
This section addresses common issues you might encounter with your Bante 820 meter.
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on | Dead or incorrectly installed batteries | Check battery polarity; replace batteries. |
| Unstable or inaccurate readings |
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| Calibration fails |
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| Data transfer via USB not working |
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6. Specifications
Detailed technical specifications for the Bante 820 Portable Dissolved Oxygen Meter:
Image 6.1: Detailed specifications table for the Bante 820 meter. This table outlines ranges, resolutions, accuracies, and other operational parameters.
| Parameter | Specification |
|---|---|
| Dissolved Oxygen (Concentration) | |
| Range | 0.00 to 20.00 mg/L |
| Resolution | 0.01 mg/L |
| Accuracy | ±0.5 mg/L |
| Dissolved Oxygen (% Saturation) | |
| Range | 0.0 to 200.0 % |
| Resolution | 0.1 % |
| Accuracy | ±2.0 % |
| Calibration Points | 1 or 2 points |
| Temperature Compensation | 0 to 50°C / 32 to 122°F, automatic |
| Barometric Pressure Correction | 60.0 to 113.3 kPa / 450 to 850 mmHg |
| Salinity Correction | 0.0 to 50.0 ppt |
| Data Storage | 100 sets |
| Auto-Power Off | 30 minutes after last key pressed |
| Power Supply | 3 × 1.5V AA batteries or 5V DC power adapter |
| Dimensions | 170 × 85 × 30 mm / 6.7 × 3.4 × 1.2 in. |
| Weight | 300 g / 10.5 oz. |
7. Warranty
Bante Instruments warrants this product to be free from defects in material and workmanship for a period of one year from the date of purchase. This warranty does not cover damage caused by misuse, neglect, accident, alteration, or improper installation. For warranty service, please retain your proof of purchase and contact customer support.
8. Support
For technical assistance, troubleshooting, or to inquire about replacement parts, please contact Bante Instruments customer support. Refer to the official Bante Instruments website for the most current contact information.
Online Resources:
- Visit the Bante Instruments Store on Amazon for product information and accessories.
