Navigator 600 Silica
Single-stream Appendix G – Analyzing a Grab Sample
IM/NAV6S/SS–EN Rev. E 85
Appendix G – Analyzing a Grab Sample
To analyze a grab sample:
1. Setup a grab sample:
a. unscrew the Secondary bottle lid and remove the level
sensor.
b. rinse the level sensor with high purity water.
c. place the level sensor into a grab sample container.
2. Energize the Secondary Calibration Valve:
a. at the 'Calibration & Maintenance' parameter, select
'Manual Test Settings' and press 'OK' (this takes the
analyzer Offline).
b. go to 'Test Valves' and set 'Sec. Cal Value On' by
pressing Enter.
c. exit this section by selecting 'TEST' mode (not
'NORMAL').
3. Measure the sample:
a. leave the sample flowing for at least 20 minutes – the
reading stabilizes between 15 and 20 minutes,
depending upon the difference in silica levels from the
analyzer sample and the grab sample.
4. Finish:
a. remove the level sensor form the grab sample, rinse
thoroughly with high purity water, place back in the
secondary calibration solution.
b. leave running for a 5 minutes to allow the sample line
to flush through.
5. De-energize the Secondary Calibration Valve:
a. return to the 'Calibration & Maintenance' parameter
'Manual Test Settings' option, select 'Exit' and press
'Enter'.
b. exit this section by selecting 'NORMAL' (not 'TEST') –
the analyzer now reverts to normal operation following
a recovery period.
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