Grab Sample; Calibration Timings; Recovery Period; Regeneration Procedure - ABB Navigator 500 Series Operating Instructions Manual

Navigator 500
Sodium analyzer

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 6.7, 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
Section 5.1, page 21).
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.
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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
5 Calibration
OI/ASO550–EN Rev. G