1. Introduction
The Milwaukee MW101 PH Meter is a portable device designed for accurate pH measurements with a 0.01 pH resolution. It features manual temperature compensation and a compact, ergonomic design, making it suitable for various applications including educational, agricultural, horticultural, and environmental analysis. This manual provides detailed instructions for the proper setup, operation, and maintenance of your MW101 PH Meter to ensure reliable and consistent performance.
Figure 1: Milwaukee MW101 PH Meter main unit.
2. Safety Information
Please read all safety information before operating the device. Failure to follow these instructions may result in injury or damage to the meter.
- Always handle the pH electrode with care. It is a delicate component.
- Do not immerse the meter body in water or other liquids. The meter is not waterproof.
- Keep calibration solutions and cleaning solutions out of reach of children and pets. Follow safety data sheet (SDS) instructions for chemical handling.
- Ensure the battery compartment is securely closed to prevent moisture ingress.
- Dispose of batteries and the meter according to local regulations.
3. Setup
3.1 Unpacking and Inspection
Carefully unpack the MW101 PH Meter and all accessories. Verify that the following items are included:
- MW101 PH Meter unit
- MA911B/1 pH electrode
- pH 7.01 calibration solution sachet (20 ml)
- Calibration screwdriver
- 9V battery
- Instruction manual (this document)
Inspect all components for any signs of damage. If any items are missing or damaged, contact your supplier immediately.
3.2 Battery Installation
- Locate the battery compartment cover on the back of the meter.
- Slide or unclip the cover to open the compartment.
- Connect the 9V battery to the battery clip, ensuring correct polarity.
- Place the battery inside the compartment and close the cover securely.
3.3 Electrode Connection and Preparation
- Connect the MA911B/1 pH electrode BNC connector to the BNC socket on the top of the meter. Ensure a firm connection.
- Remove the protective cap from the electrode tip. The cap contains a storage solution to keep the electrode hydrated.
- Rinse the electrode tip thoroughly with distilled or deionized water. Do not wipe the electrode tip, as this can create static charges and damage the sensitive glass bulb.
- The electrode is now ready for calibration and measurement.
4. Operating Instructions
4.1 Powering On/Off
Press the ON/OFF button located on the front panel to turn the meter on or off.
4.2 Calibration
For accurate measurements, the MW101 PH Meter requires regular calibration. It is recommended to calibrate the meter before each use or at least once a day.
- Turn on the meter.
- Rinse the electrode with distilled or deionized water and blot dry.
- Open the pH 7.01 calibration solution sachet and immerse the electrode tip into the solution.
- Allow the reading to stabilize on the display.
- Using the supplied calibration screwdriver, adjust the pH7 trimmer (located on the front panel) until the display shows "7.01".
- Rinse the electrode again with distilled or deionized water.
- If a two-point calibration is desired for greater accuracy, repeat steps 3-5 using a pH 4.01 or pH 10.01 buffer solution and adjust the corresponding pH4/10 trimmer.
- The meter is now calibrated and ready for use.
4.3 Manual Temperature Compensation
The MW101 features manual temperature compensation. pH measurements are temperature-dependent. To ensure accuracy, measure the temperature of your sample and adjust the Temperature Compensation knob on the front panel to match the sample's temperature.
4.4 Taking Measurements
- Ensure the meter is calibrated and the temperature compensation is set to the sample's temperature.
- Rinse the electrode with distilled or deionized water and blot dry.
- Immerse the electrode tip into the sample solution, ensuring the sensing bulb is fully submerged.
- Gently stir the electrode in the sample to ensure homogeneity and allow the reading to stabilize on the display.
- Record the pH value.
- After measurement, rinse the electrode thoroughly with distilled or deionized water before storing.
5. Maintenance
5.1 Electrode Storage
Proper electrode storage is critical for its longevity and performance.
- Always keep the electrode tip hydrated. Never allow the electrode to dry out.
- Store the electrode with its protective cap filled with a proper electrode storage solution (e.g., Milwaukee MA9015). Do not use distilled or deionized water for long-term storage, as this can deplete the electrolyte.
- If the electrode has dried out, soak it in storage solution for at least 1 hour before use.
5.2 Electrode Cleaning
Regular cleaning helps maintain electrode accuracy.
- For general cleaning, rinse the electrode with distilled or deionized water.
- For stubborn deposits or buildup, use a specialized electrode cleaning solution (e.g., Milwaukee MA9016). Follow the cleaning solution's instructions.
- After cleaning, rinse thoroughly and re-calibrate the meter.
5.3 Battery Replacement
When the display becomes dim or the meter shows erratic readings, it may be time to replace the 9V battery. Follow the battery installation steps in Section 3.2.
5.4 General Unit Cleaning
Wipe the meter's exterior with a damp cloth. Do not use abrasive cleaners or solvents.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not turn on. | Dead or improperly installed battery. | Check battery connection; replace 9V battery. |
| Erratic or unstable readings. |
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| Slow response time. |
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| Inaccurate readings after calibration. |
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7. Specifications
Figure 2: Milwaukee MW101 PH Meter with approximate dimensions (6.4 inches / 16 cm height).
| Model | MW101 |
| Measurement Range | 0.00 to 14.00 pH (typical for pH meters) |
| Resolution | 0.01 pH |
| Accuracy | ±0.02 pH (typical, after calibration) |
| Temperature Compensation | Manual, 0 to 50°C (32 to 122°F) |
| Electrode | MA911B/1 (included) |
| Power Supply | 1 x 9V battery (included) |
| Battery Life | Approximately 300 hours of continuous use |
| Dimensions | Approx. 160 x 80 x 35 mm (6.3 x 3.1 x 1.4 inches) |
| Weight | Approx. 220 g (8 ounces) |
| Manufacturer | Milwaukee |
| ASIN | B0009YH06Y |
8. Warranty
Specific warranty terms and conditions for the Milwaukee MW101 PH Meter are provided by the manufacturer. Please refer to the warranty card included with your product or visit the official Milwaukee Instruments website for detailed information regarding warranty coverage, duration, and claims procedures. Keep your proof of purchase for warranty purposes.
9. Support
For technical assistance, troubleshooting beyond this manual, or to inquire about replacement parts and accessories, please contact Milwaukee Instruments customer support.
Manufacturer: Milwaukee Instruments
Website: www.milwaukeeinstruments.com
Please refer to the manufacturer's website for the most current contact information, including phone numbers and email addresses.
