Honeywell APT4000PH - Calibration Error Messages

88
APT4000PH
Calibration error messages
Asymmetry potential out of range (±60 mV)
• Electrode worn out
• Buffer solution contaminated
• Buffer does not belong to configured buffer set
• Temperature probe not immersed in buffer
solution (for automatic temperature compensation)
• Wrong buffer temperature selected
(for manual temperature specification)
• Nominal electrode zero point ≠ pH 7
Symbol flashes:
Problem
Possible causes
Problems during recognition
of the buffer solution
• Same or similar buffer solution was used
for both calibration steps
• Buffer solution used does not belong to
buffer set currently configured in the analyzer
Electrode slope out of range
(80-103 %)
• Electrode worn out
• Buffer solution contaminated
• Buffer does not belong to configured
buffer set
• Temperature probe not immersed in
buffer solution (for automatic
temperature compensation)
• Wrong buffer temperature set (for manual
temperature specification)
• Electrode used has different nominal slope
89
Problems during recognition
of the buffer solution (continued)
• During manual calibration the buffer solutions
were not used in the specified order
• Buffer solutions contaminated
• Wrong buffer temperature set
(for manual temperature specification)
• Electrode defective
• Electrode not connected
• Electrode cable defective
Symbol flashes:
Problem
Possible causes
Calibration was canceled after approx.
2 min, because the electrode drift was too
large.
• Electrode defective
• Electrode dirty
• No electrolyte in the electrode
• Electrode cable insufficiently shielded or defective
• Strong electric fields influence the measurement
• Major temperature fluctuation of the buffer solution
• No buffer solution or extremely diluted