15
109117-1 Rev. A, 10/96
3
3.4 Problem Solving (cont)
If the meter passes the above test the problem is electrode
related. Refer to Section 3.4.4 for electrode troubleshooting.
If the meter fails the above test call the number on the back of
this manual for warranty and service information.
3.4.3 Meter Error Codes
Error codes are designed to give the user information on
electrode performance problems.
E1 Electrode is not reading a value close enough to the
first calibration buffer. Electrode needs
maintenance.
E2 Electrode is not giving a value within 0.5 pH of the
second calibration buffer. Electrode needs
maintenance.
Measurement is out of range of the display. The
meter would display dashes if the electrode were not
in a solution, the pH of the solution is not between
0.00 and 14.00 or if the fill solution in the electrode
is low or wrong. Dashes in the temperature mode
indicates that the ATC has failed.
Slope is a value that compares the actual slope determined by
the calibration to the theoretical slope defined by the Nernst
equation. This value is displayed as a percent of theoretical and
is called electrode efficiency (see Section 3.1 for basic theory).
Generally the slope value can be interpreted as follows:
95 - 105 % Everything is probably working fine.
90 - 95 % Electrode needs maintenance. Fresh fill solution and
general cleaning.
85 - 90 % Stop and do full electrode maintenance now.
Below 85 % Will not calibrate. Do full electrode maintenance or
replace the electrode.
Refer to the electrode manufacturer's instructions for full details
on maintenance, cleaning and reconditioning electrodes.
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