Hach Ultra ORBISPHERE 510, Operator'S Manual

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Orbisphere 510/511/512 Analyzers - Calibration Menu 63 of 138
Operator Manual
ORBISPHERE
5.4 Calibration Errors (EC and TC sensors)
Calibration is not possible in the following circumstances:
• When the "ratio ideal current" is greater than 170% or smaller than 30%
• When the sensor cannot measure (thermal cut off, sensor out, etc.)
• When the "ratio ideal current" is greater than 150% or smaller than 50%, a
warning is displayed but the calibration is valid.
5.5 Interference Calibration (EC sensor)
Instructions
Using a flow chamber, expose the sensor to the H
2
source at the same barometric
pressure that is shown on the display. Press
Start
to initiate the H
2
interference
calibration.
The hydrogen interference calibration is available for EC
sensors measuring O
2
concentrations, and is required
w h e n H
2
i n t e r f e r e n c e h a s b e e n e n a b l e d ( S e e
“Interferences Configuration” on page 51 ). The lower part
of the screen displays the actual measurement.
Enter in the upper box the purity of the hydrogen that
is used for this calibration. A reasonably pure (e.g.
99.8% or better) hydrogen source and an accurate
pressure gauge are needed.
⌧
Hold during calibration: Selected by default, this holds
the measurement sequence to avoid storing invalid
values.