2.first rinse the electrode with distilled water, and suck it with filter paper.
3.turn the meter on by pressing the 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.
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.
(if necessary repeat calibration procedure)
The instrument need recalibrate in the following condition.
1.Long time no use or use very long time after calibration
2.The electrode is used very frequently
3.The testing accuracy requirement is very high
4.Press the "CAL"button long time in the air carelessly
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.
When the display value is fuzzy or unshown , The battery should be replaced promptly.Pay attention to the polarity of battery.
The instrument is warranted to the purchaser for a year from the date of purchase.
If during these periods, repair or replacement of the instrument is required,please return the instrument to either your dealer or to our office.The repair will be effected free of charge. ( damage is not due to negligence or erroneous operation by the user)
Note :Plese provide purchase invioce or proof before returning your instruments back .