1. Introduction
The Extech DO600 Waterproof ExStik II Dissolved Oxygen Meter is designed for precise measurement of dissolved oxygen levels. It displays oxygen concentration as a percentage of saturation (0 to 200%) or as a concentration in parts per million (ppm) or milligrams per liter (mg/L) (0 to 20.00 ppm/mg/L). Key features include adjustable altitude compensation, adjustable salinity compensation, and an analog bargraph for trend indication. This manual provides instructions for the proper setup, operation, and maintenance of your DO600 meter.
2. Package Contents
Verify that all items are present and in good condition upon unpacking:
- Extech DO600 Dissolved Oxygen Meter
- DO Electrode
- Protective Sensor Cap
- Spare Membrane Cap
- Electrolyte Solution
- Four 3V CR-2032 Batteries (pre-installed or included separately)
- 48-inch (1.2m) Neck Strap
Figure 1: Extech DO600 meter with its accessories, including the electrode, caps, electrolyte, and neck strap.
3. Meter Components
Figure 2: Front view of the Extech DO600 meter.
- LCD Display: Shows dissolved oxygen readings, temperature, and other indicators.
- MODE/HOLD Button: Toggles between measurement modes and holds the current reading.
- CAL/RECALL Button: Initiates calibration and recalls stored data.
- ON/OFF Button: Powers the meter on or off.
- Electrode: Sensor for dissolved oxygen measurement.
- Protective Sensor Cap: Covers and protects the electrode.
4. Setup
4.1. Battery Installation
The DO600 meter uses four 3V CR-2032 batteries. These are typically pre-installed. If replacement is necessary:
- Twist off the battery compartment cap located at the top of the meter.
- Remove the old batteries, noting their polarity.
- Insert new CR-2032 batteries with the correct polarity.
- Securely replace the battery compartment cap to maintain the waterproof seal.
4.2. Electrode Preparation
Before first use or after prolonged storage, the DO electrode requires preparation:
- Unscrew the protective sensor cap from the electrode.
- Fill the spare membrane cap with the provided electrolyte solution. Ensure no air bubbles are trapped.
- Carefully screw the membrane cap onto the electrode, ensuring the membrane is taut and free of wrinkles.
- Allow the electrode to stabilize for approximately 15-30 minutes in the electrolyte solution before calibration.
5. Operating Instructions
5.1. Power On/Off
Press the ON/OFF button to power the meter on or off.
5.2. Calibration
Regular calibration ensures accurate readings. Calibrate the meter in air-saturated water or a known standard solution.
- Ensure the electrode is prepared as described in Section 4.2.
- Immerse the electrode in air-saturated water (e.g., tap water stirred vigorously for several minutes) or a DO standard solution.
- Press and hold the CAL/RECALL button until "CAL" appears on the display.
- The meter will automatically recognize the calibration point and adjust. Wait for the reading to stabilize and for the calibration indicator to confirm completion.
5.3. Taking Measurements
To measure dissolved oxygen:
- Power on the meter.
- Immerse the electrode into the sample solution. Ensure the membrane is fully submerged and free of air bubbles.
- Gently stir the electrode in the sample to ensure proper flow across the membrane.
- Wait for the reading on the LCD display to stabilize. The display will show both dissolved oxygen and temperature.
- Press the MODE/HOLD button to cycle between % saturation and ppm (mg/L) readings.
- To hold a reading, briefly press the MODE/HOLD button. Press again to release.
Figure 3: The Extech DO600 meter being used to measure dissolved oxygen in a laboratory.
5.4. Altitude Compensation
Dissolved oxygen saturation levels are affected by altitude. The DO600 allows for manual adjustment:
- Refer to the meter's full instruction manual for specific steps to enter and adjust altitude compensation (0 to 20,000 feet in 1,000 ft. increments).
5.5. Salinity Compensation
Salinity also influences dissolved oxygen levels. The DO600 provides adjustable salinity compensation:
- Consult the meter's comprehensive manual for detailed instructions on setting salinity compensation (0 to 50 ppt).
6. Maintenance
6.1. Electrode Cleaning and Storage
To maintain electrode performance:
- Rinse the electrode with distilled water after each use.
- If the membrane becomes fouled, gently clean it with a soft cloth or cotton swab. Replace the membrane cap if it is damaged or heavily contaminated.
- When storing, ensure the protective sensor cap is filled with electrolyte solution to keep the membrane hydrated.
6.2. Battery Replacement
Replace batteries when the low battery indicator appears on the display. Refer to Section 4.1 for battery installation instructions.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on | Dead batteries; Incorrect battery installation | Replace batteries; Check battery polarity |
| Inaccurate or unstable readings | Electrode not calibrated; Fouled membrane; Air bubbles on membrane; Insufficient electrolyte | Perform calibration; Clean/replace membrane; Remove air bubbles; Refill electrolyte |
| No reading displayed | Electrode not connected properly; Damaged electrode | Ensure electrode is securely attached; Replace electrode if damaged |
8. Specifications
| Parameter | Value |
|---|---|
| Model | DO600 |
| Dissolved Oxygen Range (Concentration) | 0 to 20.00 ppm (mg/L) |
| Dissolved Oxygen Range (Saturation) | 0 to 200.0 % |
| Temperature Range | Not explicitly stated for display, but upper rating is 50 ℃ |
| Altitude Compensation | 0 to 20,000 feet (in 1,000 ft. increments) |
| Salinity Compensation | 0 to 50 ppt |
| Power Source | Four 3V CR-2032 batteries |
| Dimensions | 6.9 x 1.6 x 1.4 inches (17.5 x 4.1 x 3.6 cm) |
| Item Weight | 3.87 ounces (0.11 kg) |
| Waterproof Rating | Yes (implied by "Waterproof ExStik II") |
Figure 4: Physical dimensions of the Extech DO600 meter. Note: The image shows 7.7 inches, while product specifications state 6.9 inches. Refer to the latest product documentation for precise measurements.
9. Product Videos
No official product videos from the seller were found for this item in the provided data.
10. Warranty and Support
For warranty information, technical support, or to purchase accessories and replacement parts, please refer to Extech's official website or contact their customer service department. You can find more information on the Extech Store on Amazon.
