Apera Instruments PC 8500 User Manual

11
Chart – 6 Self-diagnosis information of pH measurement mode
Display
Icons
Contents
Checking
Wrong pH buffer solution or the buffer
solution out of range.
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 measuring value
is not stable during calibration.
Press key when icon appears.
During calibration, the measuring value
is not stable for ≥3min.
1.Check whether there are bubbles in glass bulb.
2.Replace with a new pH electrode.
pH electrode performance error
( zero potential <-60mV or >60mV,
slope <75%）
1.Check whether there are bubbles in glass bulb.
2.Check whether pH buffer solution is correct.
3.Replace with new pH electrode.
Enter in pre-set due calibration date
reminder
Press key to perform calibration or cancel due
calibration setup per parameter P1.4
4.5.3. pH temperature principle
Please note that the closer the temperature of the sample solution is to the calibration solution, the more
accurate will be the readings.
4.5.4. Factory default setting
For factory default setting, please refer to parameter P1.6 (clause 7.3). 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 irretrievable.
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 method to prepare this solution: add
26g KCL in 100ml pure water).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 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.
4.6.3. Protect glass bulb

Apera Instruments PC 8500 Specifications

General

Brand	Apera Instruments
Model	PC 8500
Category	Measuring Instruments
Language	English