Metex 8760CLP Total Free Chlorine & pH Analyzer - Manual (Page 42)

AQUAMETRIX INC.
1-800-742-1413 www.aquametrix.com
42
Messages for pH Input
Error Description Causes Solutions
E3.1 Electrode has not stabilized
after 5 minutes of
calibration.
Poor electrode performance. Check electrode, redo calibration.
Large offset in electrode. Calibrate specifying custom, pH 4, pH 7, or
pH 10 buffer to allow for offsets of up to ±
4 pH units.
Perform electrode maintenance.
E3.2 Electrode has stabilized, but
offset > ± 1.3 pH units.
This error generated by auto
detection of pH 4, pH 7,
and pH 10 buffers only.
Previous offset is retained. Wrong buffer used for calibration Only
pH 4, pH 7, and pH 10 buffers can be
detected automatically.
Specify the correct pH value for the
standard and redo the calibration.
Wrong buffer used for calibration. Redo calibration specifying correct buffer.
Bad electrode. Perform electrode maintenance.
E3.3 Electrode has stabilized, but
offset > ± 4 pH units.
Previous offset retained.
Electrode not connected. Check connections, redo calibration.
[buF2] calibration done before [buF1]
calibration. Calibrate using [buF1] for first buffer, then
go to [buF2] to calibrate for slope.
Select buffers which are further apart to
allow for more accurate slope calculation.
Buffers used in [buF1] and [buF2] are too
close together or are the same buffer.
Perform [buF1] calibration only and use
default slope.
E3.4 Electrode efficiency less
than 60% or greater than
110% Nernstian response;
slope is too flat or too steep.
Previous calibration is
retained.
Wrong buffer specified.
Redo calibration with correct buffer.
TC is not connected. Check TC connections or use manual TC. E3.5 Temperature compensator is
off-scale.
Process is outside of TC operating range
of -5 °C to 105 °C.
Redo calibration within TC operating range
or use manual temperature compensation.
Large offset in reference electrode or
electrode depleted.
Check electrode, service or replace as
required.
CA3.6 Offset > 1.3 pH units.
Bad buffer used for calibration. Use fresh buffer.
Poor electrode pair performance. Check both the reference and the glass pH
electrode. The glass may need to be etched
or cleaned.
Bad buffer used for calibration. Use fresh buffer.
Buffers were too close together. Use buffers which are further apart.
Allow more time for the analyzer to
stabilize, repeat calibration if necessary.
CA3.7 Slope efficiency less than
85% or greater than 102%
Nernstian response.
Electrodes did not stabilize.
Use buffer closest to pH 7 as first buffer.