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Calibration
We recommend to operate at least a 2-point calibration. If you can only
perform a 1-point calibration, please make sure the buffer value is very closed
to the sample you are measuring and the buffer temperature must be stable
enough.
1. Select "pH" mode. Rinse the pH electrode in de-ionized water or rinse
solution. DON'T wipe the pH probe dry. Wiping the probe may cause
static and cause calibration and measurement instability.
2. Select the pH buffer (See P4.0) and pour some into a clean container. Dip
the probe into the buffer. The end of the probe must be immersed into
the buffer. Stir the probe gently to create a homogenous sample.
3. Press "CAL" key to enter calibration mode. The "CA" icon flashes on LCD.
4. If the buffer is set as NIST in P4.0, the main display shows the auto
recognized buffer value. (Fig. 12). If this value keeps changing means the
buffer or probe need to be checked or changed.
5. I f the buffer is set as CUST in P4.0, the main display shows default 2.00,
short press "HLD" key to select the buffer range you are using. Then,
press " " or " " key to fine adjust the value in order to meet with
buffer.
6. Wait until "Ready" icon appear on LCD. Press "ENTER" to confirm.
7. Change buffer & repeat step 5~6 to do multiple points calibration or press
"ENTER" key to end the calibration and return to normal mode.
NOTE: When in calibration, the buffer temperature must be stable enough.
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