Hach ORBISPHERE K-M1100, Руководство пользователя

Страница: 56 / 116

55
Measurement Menu
Measurement filter configuration
The filters are aimed at “flattening” the measurement curve in situations where the process shows
atypical peak values that could otherwise hamper the interpretation of measurement readings. The filter
is applied on the last set of measurements each time a measurement is taken.
• Mean : Mathematical average of the last set (depth) of measurement values.
• Median filter : Allows for eliminating atypical peak measurement values, and average the remaining
ones. The calculation sorts the last measurements set (depth) by values, then delete the highest and
lowest values, and averages the remaining values (central depth).
Example for depth 7, central depth 5:
Sorted values, both ends eliminated, the average of the center five is then
3.88 .
0.7 - 1.1 - 4.0 - 4.3 - 4.4 - 5.6 - 7.0
Example for depth 5, central depth 3:
Sorted values, both ends eliminated, the average of the center three is then
4.23 .
1.1 - 4.0 - 4.3 - 4.4 - 5.6
Example for depth 8, central depth 4:
Sorted values, both ends eliminated, the average of the center four is then
4.43 .
0.7 - 1.1 - 4.0 - 4.3 - 4.4 - 5.0 - 5.6 - 7.0
Oxygen interference configuration
These options are available to take into account the influence of some components or gases in the
sample during measurement. All available interference corrections are disabled by default.
• Select Chlorinity, Salt or disabled. For chlorinity or salt, it is required to enter the actual concentration
in sample.
Sample configuration
• TPO enable (portable instruments in “Sample mode” measurement only): Identify if TPO calculation
is required.
• TPA enable (portable instruments in “Sample mode” measurement only): Identify if TPA calculation is
required.
• If TPA is enabled, enter the TPA K coefficient if different from the displayed value.
TPO or TPA calculation
The TPO and TPA features are available on the portable
instrument for sensors measuring oxygen (refer to the table in
Generic terms and definitions on page 113
for an explanation of these two terms).
To initiate these options, the instrument must be configured in “Sample mode” (refer to
Continuous or
sample mode selection on page 52 ) and the TPO or TPA calculation must be enabled. Refer to Sample
configuration on page 55 .
The operator also needs to ensure the package is shaken for about 5 minutes before measuring, and to
know the total volume of the package and the total volume of the contents of the package.
TPO and TPA parameters
The parameters required for TPO and TPA calculation are the same.
• Overflow volume: Total package size
• Net content volume : Volume of liquid in the package
Press the Compute button to calculate the TPO or TPA. The parameters can be changed and the value
recalculated if necessary.
TPO values are displayed in ppm, TPA values in mL.
To store the measurement, press the
OK button.