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Wrong pH buffer solution or the buffer
solution out of range.
Press
is not stable during calibration.
During calibration, the measuring value
is not stable for ≥3min.
pH electrode zero electric potential
out of range（<-60mV or >60mV）
pH electrode slope out of range
（<85% or >110%）
Enter in pre-set due calibration to
remind calibration
4.5.5. pH temperature principle
Please note that the closer the temperature of the sample solution to the calibration solution, the more
accurate readings.
4.5.6. Factory default setting
For factory default setting, please refer to parameter P1.6 (Item 8.3). Per parameter P1.6, all calibration
data is deleted and the meter restores to the theory value (zero electric potential of pH is 7.00, the slope
is 100%). Some functions restore to the original value (refer to Appendix-I). When calibration or
measurement fails, please restore the meter to factory default setting and then perform re-calibration or
measurement. Please note once set the factory default, all the data deleted will not be retrievable.
4.6. pH electrode maintenance
4.6.1. Daily maintenance
The soaking solution contained in the supplied protective bottle is used to maintain activation in the glass
bulb and junction. Loosen the capsule, remove the electrode and rinse in pure water before taking a
measurement. Insert the electrode and tighten the capsule after measurements to prevent the solution
from leaking. If the soak solution is turbid or moldy, replace the solution.
The electrode should not be soaked in pure water, protein solution or acid fluoride solution for long
periods of time. In addition, do not soak the electrode in organic silicon lipids.
For best accuracy, always keep the meter clean and dry, especially the meter's electrode and electrode
socket. Clean with medical cotton and alcohol if necessary.
4.6.2. Calibration buffer solution
For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer solution
should be refreshed often, especially after heavy use.
Chart – 6 Self-diagnosis information of pH measurement mode
Contents
key when measuring value
1.Check whether pH buffer solution is correct.
2.Check whether the meter connects the electrode
properly.
3.Check whether the electrode is damaged.
Press
key when
1.Check whether there are bubbles in glass bulb.
2.Replace with a new pH electrode.
1.Check whether there are bubbles in glass bulb.
2.Check whether pH buffer solution is correct.
3.Replace with new pH electrode.
Press
key to perform calibration or cancel due
calibration setup from parameter P1.2.
15
Checking
icon appears.
SX800 Version2.0
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