EZ9901 Digital PH/TDS/TEMP Meter Instruction Manual

1. Introduction

The EZ9901 Digital PH/TDS/TEMP Meter is a versatile 3-in-1 handheld device designed for accurate measurement of Potential Hydrogen (pH), Total Dissolved Solids (TDS), Electrical Conductivity (EC), and Temperature in various water sources. This high-accuracy tester is ideal for monitoring drinking water, aquariums, swimming pools, agricultural water, and natural water bodies.

2. Package Contents

Please check the package for the following items:

• 1 x EZ9901 Digital PH/TDS/TEMP Meter
• 2 x Calibration packets (4.00 + 6.86 pH Buffer Powder)
• 1 x User's Manual (this document)

3. Product Features

• Measures pH, EC, TDS, and Temperature simultaneously.
• Digital display for clear readings.
• 1, 2, or 3-point automatic pH calibration.
• Automatic Temperature Compensation (ATC) from 0-60°C.
• Replaceable electrode for extended device lifespan.
• Automatic power-off function after 5 minutes of inactivity.
• Data-hold function to freeze readings.
• Low battery indicator for timely battery replacement.
• High accuracy for reliable measurements.

4. Parts Diagram

Familiarize yourself with the components of your EZ9901 meter:

• Battery Case: Houses the batteries.
• pH/TDS Display: Shows measurement readings.
• ON/OFF Button: Powers the device on or off.
• TEMP/CAL Button: Used for temperature unit switching and calibration.
• MODE Button: Switches between pH and TDS measurement modes.
• Protection Cap: Covers and protects the electrode.

5. Setup and Operation

5.1 Power On/Off

Press the ON/OFF button to turn the meter on or off.

5.2 Mode Switching (pH / TDS)

To switch between pH and TDS measurement modes:

1. Turn on the meter by pressing ON/OFF.
2. The display will show the last used mode (e.g., TEMP).
3. Press the MODE button to cycle through pH and TDS modes.

5.3 Temperature Unit Switching (°C / °F)

To switch between Celsius (°C) and Fahrenheit (°F) temperature units:

1. Turn on the meter by pressing ON/OFF.
2. The display will show the current temperature unit.
3. Press the TEMP/CAL button to toggle between °C and °F.

5.4 TDS Calibration

The instrument is factory calibrated for TDS. If recalibration is necessary, use a 1413µs/cm standard solution.

1. Prepare 250ml of 1413µs/cm standard solution.
2. Power on the meter.
3. Press the MODE button to enter TDS mode.
4. Press and hold the TEMP/CAL button for 5 seconds. The display will flash '706' three times.
5. The TDS calibration is finished.

5.5 pH Calibration

The meter supports 1, 2, or 3-point pH calibration using standard buffer solutions (6.86, 4.00, 9.18 pH).

1. For 6.86 pH point:
   1. Prepare 250ml of 6.86 pH standard solution.
   2. Power on the meter.
   3. Press the MODE button to enter pH mode.
   4. Press and hold the TEMP/CAL button for 5 seconds. The display will flash '6.86' three times.
   5. The 6.86 pH calibration is finished.
2. For 4.00 pH point (after 6.86 pH calibration):
   1. Prepare 250ml of 4.00 pH standard solution.
   2. Ensure 6.86 pH calibration is complete.
   3. Short press the TEMP/CAL button again. The display will flash '4.00' three times.
   4. The 4.00 pH calibration is finished.
3. For 9.18 pH point (after 6.86 pH calibration):
   1. Prepare 250ml of 9.18 pH standard solution.
   2. Ensure 6.86 pH calibration is complete.
   3. Short press the TEMP/CAL button again. The display will flash '9.18' three times.
   4. The 9.18 pH calibration is finished.

Note: If you calibrate the meter in the wrong solution or in the air, it will flash "ERR" on the screen. The meter will return to the last step of operation. If necessary, recalibrate the meter.

6. Maintenance

6.1 Battery Replacement

When the low battery indicator flashes, it's time to replace the batteries.

1. Open the battery case.
2. Take out the old batteries.
3. Replace with new 3*1.5V (AG-13 button cell) batteries, ensuring correct polarity.
4. Close the battery case.

6.2 Electrode Replacement

If the electrode is damaged or no longer provides accurate readings after cleaning and calibration, it may need replacement.

1. Turn the protection cap left to remove it.
2. Pull out the old electrode horizontally.
3. Insert the new electrode.
4. Replace the protection cap.

6.3 General Care

• Always replace the protection cap after use to prevent damage to the electrode.
• Clean the electrode with distilled water after each use.
• Store the meter in a cool, dry place.

7. Specifications

Detailed specifications for the EZ9901 Digital PH/TDS/TEMP Meter:

8. Troubleshooting

• "ERR" Message During Calibration: If the display shows "ERR" during calibration, it indicates that the meter was calibrated in the wrong solution or in the air. Please ensure the correct buffer solution is used and the electrode is fully immersed. Recalibrate the meter following the steps in Section 5.4 and 5.5.
• Inaccurate Readings:
  • Ensure the electrode is clean. Rinse with distilled water.
  • Check battery level; replace if low.
  • Recalibrate the meter if it hasn't been calibrated recently or if readings are consistently off.
  • Ensure the temperature of the sample is within the meter's operating range.
• No Display/Power Issues:
  • Check if batteries are inserted correctly.
  • Replace batteries if they are old or depleted.

9. User Tips

• For best accuracy, always ensure the electrode is thoroughly rinsed with distilled water before and after each measurement.
• When measuring, gently stir the meter in the sample to ensure a stable reading.
• Keep calibration solutions fresh and at room temperature for optimal calibration results.
• Avoid touching the electrode with your fingers, as oils and contaminants can affect readings.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your original seller or refer to the product's purchase documentation. Keep your proof of purchase for any warranty claims.

11. Product Video

Watch this video for a visual overview of the EZ9901 Digital PH/TDS/TEMP Meter.