Appendix B - Troubleshooting; Analyzer Malfunction; Cell Diagnostics; Effects Of Loss Of Power To The Analyzer - ABB Aztec 600 User Manual

Aztec 600 aluminium, ammonia, color, iron, manganese, phosphate
Single- and multi-stream colorimetric analyzers
Appendix B – Troubleshooting
B.1 Analyzer Malfunction
In the majority of cases any problems experienced are usually
associated with the chemistry and the liquid handling section.
Check mechanical components that are involved with the liquid
handling systematically. For example, check pumps, valves,
tubing and tubing connections for correct operation and for
leaks or blockages that change the chemical conditions within
the analyzer.
Caution. Check that there have been no unauthorized
modifications, for example, incorrect tubing fitted.
A calibration fail can be caused by almost any part of the liquid
handling section of the analyzer, including the solutions.
Measurement variations may be due to air bubbles within the
sample entering the measurement cell or particulates causing
restrictions within the analyzer sample tubing and valve block.
Any unpredictable problems may be due to the standard or
reagent solutions or their flow through the analyzer. If any doubts
exist regarding the integrity of these solutions, replace with new
solutions in the early stages of the fault finding investigations.
Ensure reagent solutions are connected correctly and are within
their expiry date.
B.2 Cell Diagnostics
Within the Cell Diagnostics (see Section 10.2, page 54),
operation of the analyzer can be controlled manually.
This mode is used to check the basic performance of the
analyzer, such as the operation of the piston assembly, the
activation of valves and the general fluid handling.
It also displays the detector output in real time, allowing the
checking of the LED light source and the response of the
detector.
IM/AZT6CR–EN Rev. J
B.3 Effects of Loss of Power to the Analyzer
The automatic action taken by the analyzer following loss of
power is dependent upon the length of time the power was off.
Table B.1 shows the automatic functions performed:
Analyzer
Status
< 6 hours
During Function:
measurement,
1. Piston resets
calibration or
cleaning 2. Analyzer
performs a prime
routine
3. Analyzer
performs a
calibration
4. Analyzer goes
into
measurement
Analyzer analog
outputs are held at the
last output levels prior
to the loss of power.
Analyzer relay outputs
are re-evaluated after
power restoration on
the basis of current
operating conditions.
The measurement
display retains the last
value recorded before
loss of power.
Table B.1 Automatic Functions by Status/Power Loss
Appendix B – Troubleshooting
Period of Loss of Power
> 6 hours
Function:
1. Piston resets
2. Analyzer performs a
prime routine
3. Analyzer performs a
calibration
4. Analyzer goes into
measurement
Analyzer analog outputs
are reset to minimum.
Analyzer relay outputs are
re-evaluated after power
restoration on the basis of
current operating
conditions.
The measurement display
resets (is blank) until a new
measurement is
completed.
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