Hach AMTAX sc Mode D'emploi page 30

Troubleshooting
7.3 Troubleshooting the Electrode
The electrode data are saved in the AMTAX sc Calibration data menu or in the event
logger.
Typical electrode values (note sign):
Table 7
and membrane cap.
The zero value is always the most positive value and the standard 2 value is always the
most negative value in a calibration. The standard 1 is always between the zero value and
the standard 2 value.
When starting up an electrode, the slope increases to the final value (ideal between –58
and –63 mV) and remains there with minor fluctuations.
Description
(0.02–5 mg/L NH4–N)
Slope
Slope warning
Slope error
mV zero
–200 to –140 mV
mV standard 1
–240 to –180 mV
mV standard 2
The error descriptions for the electrode in
error/warning "electrode slope" or "false elec. data".
Error description
The calibration values for the standards
are both above the mV zero value.
The calibration values for the two
standards and the mV zero value are all
indicating very similar values.
Only the mV standard 1 value is above
the mV zero value.
Only the mV standard 2 value is above
the mV zero value.
The mV zero value is in the negative
range.
30
All manuals and user guides at all-guides.com
contains typical electrode data for a new inserted electrode with new electrolyte
Table 7Typical electrode values
MR 1
(0.05–20 mg/L NH4–N)
–205 to +5 mV 20 to 120 mV
–30 to 30 mV
–30 to –90 mV
Table 8Error messages
Diagnostics
- Reagent empty
- Reagent pump faulty
- Fittings leaking
- Electrode faulty
- Electrolyte empty
- Standard 1 empty
- Piston pump leaking
- Standard 2 empty
- Piston pump leaking
- Cleaning solution empty
- Cleaning pump faulty
- Fittings leaking
MR 2 MR 3
(1–100 mg/L NH4–N)
–55 to –67 mV
–50 to –55 mV or –67 to –70 mV
0 to –50 mV or –70 to –150 mV
20 to 120 mV
–25 to –85 mV
–70 to –130 mV
Table 8 and
MR 4
(10–1000 mg/L
NH4–N)
20 to 120 mV
–70 to –130 mV
–130 to –190 mV
Table 9 are related to the
Solution
- New reagent
- Replace reagent pump
- Tighten fittings
- Re-new electrolyte
- Insert new electrode
- New standard 1
- Replace piston & cylinder (piston
pump)
- New standard 2
- Replace piston & cylinder (piston
pump)
- New cleaning solution
- Replace cleaning pump
- Tighten fittings
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