Apera Instruments PH8500 User Manual

12
Press key to enter
into the calibration
mode.
c) The value set in “Customer-defined” is at a fixed temperature. The meter is suggested to perform
calibration and measurement at the same temperature to avoid large error. The meter cannot
automatically recognize customer-defined calibration solution.
4.5 Sample Test
4.5.1. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in sample solution.
Stir the solution briefly and allow it to stay in the sample solution until the stable value and icon
appears on LCD, get the reading which is pH value of sample solution, please refer to Diagram-11 for
calibration and measurement process of pH meter.
Diagram – 11 Calibration and measurement process of pH meter
4.5.2. Self-diagnosis information
During the process of calibration and measurement, the meter has self-diagnosis functions, indicating
the relative information as below, please refer to Chart – 6.
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 after icon appears and stays
on screen.
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.
Submerge the electrode
in pH4.00 solution, press
key when icon
appears.
Press to turn on
the meter.
Press key to enter
the calibration mode.
Submerge the electrode
in pH7.00 solution, press
key when icon
appears.
1
st
point calibration is
done, meter goes into
measurement mode.
1
st
point calibration
Sample
Test
2
n d
point
calibration
3
r d
point calibration
2
nd
point calibration is
done, meter goes into
measurement mode.
3
rd
point calibration is
done, meter goes into
measurement mode
Submerge the electrode
in pH10.01solution,press
key when icon
appears.
Press key to enter
the calibration mode.

Apera Instruments PH8500 Specifications

General

Brand	Apera Instruments
Model	PH8500
Category	Measuring Instruments
Language	English