Navigator 600 Phosphate
Multi-stream
7 Calibration & Maintenance
44
IM/NAV6P/MS–EN Rev. F
The zero, secondary and zero & secondary sequences can be
initiated manually or at programmed intervals.
Table 7.1 shows the timings for the full calibration sequence.
7.3 Cleaning
The analyzer can be programmed to introduce an alkaline
cleaning solution through the normal solution flowpath
automatically.
The alkaline solution has 2 main functions:
to remove the build up of precipitation or deposits in the
system due to the acidic chemistry conditions inside the
reaction block and optical unit. If cleaning is carried out
frequently, build up, and its effects on the zero offset, are
minimized.
to keep all the surfaces very clean and wetted, reducing
the effects of bubble formation due to sample and reagent
degassing.
Cleaning can be initiated either manually or automatically at
pre-programmed intervals with an adjustable duration.
The ideal frequency and duration of cleaning is determined by
monitoring the zero offset parameter at the end of each
calibration sequence. If the zero offset is not increasing by more
than 0.1 ppm from one zero calibration to the next, cleaning can
be less frequent.
The recommended initial starting point is to clean frequently for
a short period, for example, weekly for 30 minutes.
Activity
Zero
(if required)
/ (Stability)
Secondary
Cal
(if required)
/
(Stability)
Recovery
(introduce
sample)
Normal
Operation
Valve
Energized
Zero
(Zero)
Secondary /
(Secondary)
None
None
Timing
(minutes)
Default
24
(up to 10)
21 /
(up to 10)
18
N/A
Calibration
Relay
Energized /
(Energized)
Energized /
(Energized)
Energized
De-energized
Table 7.1 Calibration Sequence
