Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 86)

Troubleshooting
84
10.4 Calibration errors
Table 24 describes the calibration error messages.
Table 24 Calibration error messages
Display Description Corrective action
Zero error icon
Offset potential of pH probe
in pH 7 buffer is out of range
(± 60 mV)
Make sure that the buffer
used matches the buffer
specified in configuration.
Replace the buffer solution.
Make sure that the pH probe
has a offset potential of
approximately 0 mV in a
pH 7 buffer solution; if not
adjust the zero (page 74).
Make sure that the
temperature probe is
immersed in buffer solution
(for automatic temperature
compensation).
Make sure of the
temperature specification in
configuration.
Replace the probe.
Slope error icon
Slope of pH probe is out of
range (80–103%)
Make sure that the buffer
used matches the buffer
specified in configuration.
Replace the buffer solution.
Make sure that the
temperature probe is
immersed in buffer solution
(for automatic temperature
compensation).
Make sure of the
temperature specification in
configuration.
Replace the probe.