Navigator 500
Sodium analyzer
5 Calibration
28
OI/ASO550–EN Rev. G
5.5.5 Grab sample
Pour the sample to be measured into the High Calibration bottle
(it is advisable to rinse the bottle with the sample to remove the
residuals of the calibration solution). The grab sample procedure
can then be initiated manually via the
Calibration
menu. The
default grab sample time is 15 minutes but can be set between
10 and 60 minutes depending on the level of accuracy required
and the level of sodium to be measured.
The grab sample is displayed on-screen as entry G and logged
in the
Calibration Log –
see Section
, page 34.
To set up a
Grab Sample
routine:
1. Access the configuration level
Calibrate
menu –
see Section 5.1, page 21).
2. Run the
Grab Sample
routine at the
Sensor 1(4)
(single-stream) or
Sensor Three Stream
/
Sensor
Calibration /
Grab Sample
menu option.
5.6 Calibration timings
Low point and high point calibrations are 15 minutes each.
5.6.1 Recovery period
The recovery period allows time for the wet-section to return to
the
Process Value
after a calibration. Current outputs and
alarms are held during the recovery period if the
Hold Output
option is enabled.
To enable the
Hold Outputs
option:
1. Access the configuration level
Calibrate
menu (see
2. Select
Enable
at the
Sensor 1 (4)
(single-stream) or
Sensor
Three Stream
/
Hold Outputs
menu option.
The default value for the recovery period is 15 minutes but can
be configured between 10 and 60 minutes.
5.7 Regeneration procedure
If the sodium electrode is exposed to low concentrations (less
than 1 ppb) for prolonged periods of time, sodium ions are
leached from the surface of the electrode into the sample. This
can accelerate the aging process of the electrode, resulting in
poor response times, inaccurate readings and a limitation to
respond to low sodium concentrations.
It is recommended that the electrode is regenerated at regular
intervals to minimize this ageing process and ensure accurate,
repeatable readings.
Perform a regeneration procedure once a month either manually
or automatically (if the
Automatic Regeneration
option is
available) prior to a two-point calibration:
to perform an automatic regeneration, refer to Section 8.3,
page 61
to perform a manual regeneration, refer to Section 8.4,
page 63