New model Testing water hardness ph meter

Testing water hardness ph meter

Operation

1.remove  the  protective cap.

2.first rinse the electrode with distilled water, and suck it with filter paper.

3.turn the meter on by pressing the “ON” key.

4.immerse the ph meter electrode in the solution to be tested(can not be over the immersion line )

5.stir gently and wait around 30 seconds till  the reading stabilized.

6.after finished ,clear the electrode with pure water ,turn the meter off  by  pressing the “ON/OFF” key.

7.Always replace the protective cap after use.

Calibration

1. Turn on pH meter

2. Disolve each buffer solution in 250 ml of distilled water. 

3. Immerse the electrode into the  pH 6.86  solution.

     (under the temperature of 25)

4. Press the "CAL" (calibration) button for 3 seconds and release

    -Display  will start flashing 6.86   

    -Wait until the display stops flashing.

   Rinse the electrode with distilled water and dry it with filter paper.

5. Immerse the electrode in pH 4.00 solution,

    - Press  "CAL" button for 3 seconds ,then press and release immediately second time 

    - Reading will start flashing  4.00

    - Wait until display stops flashing

Rinse and dry the electrode with distilled water as before.

6. Test calibration by inserting electrode into pH 9.18 buffer solution,

   gently swirl electrode until digital display stabilizes. Display should read between 9.16 and 9.20.

  (if necessary repeat calibration procedure)

Note

If approximate pH of solution is known to be above 7.0,calibration meter using the 6.86 and 9.18 solutions.To do this follow step 3,then immerse electrode into 9.18 solution.Press and hold cal button for 3 seconds,then press and release button two more times.reading will start flashing 9.18,then proceed as before.This will provide greater accuracy.

LowBatt

When the display value is fuzzy or  unshown , The battery should be replaced  promptly.Pay attention to the polarity of battery.

Maintenance:

Always replace protective cap after using digital meter to keep electrode from drying out due to prolonged exposure to air,

which leads to slow and/or unstable readings.

If electrode has been dried out immerse it into distilled water for a few hours.