Hach ORBISPHERE K-M1100 Basic User Manual page 19

• An error has occurred (e.g. sensor out)
3. When the sample measurement stops because the stop criteria are fulfilled, the gas
concentration and temperature are no longer refreshed. They indicate the measurement when the
stop criteria was reached. If the channel was configured for TPO or TPA calculation, enter the
parameters.
4. If the sample mode is stopped for another reason (user abort, max. time, or measurement error),
the aborted message is displayed.
8.2.5.1 TPO or TPA calculation
The TPO (Total Package Oxygen) and TPA (Total Package Air) features are available on the
instrument with a sensor measuring oxygen. To initiate these options, the instrument must be
configured in Sample mode and the TPO or TPA calculation must be enabled. 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.
8.2.5.2 TPO and TPA parameters
1. Overflow volume: Total package size
2. Net content volume: Volume of liquid in the package
3. 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.
4. To store the measurement, press the OK button.
8.2.5.3 Stop criteria configuration
The stop criteria setting is available in theSample mode measurement option in the channel
configuration window.
Note: The parameters available for configuration depend on the type of stop criteria being defined.
1. Select Menu>Main>Configure the channel, then press the Sample Mode button and the Stop
criteria button.
Option Description
Above The stop criteria is met when the gas concentration is greater than the parameter entered
threshold in Threshold
Below The stop criteria is met when the gas concentration is lower than the parameter entered in
threshold Threshold
Stability The stop criteria is met when the variation of the gas concentration is smaller than the
parameter entered in Variation
Note: The number of samples taken into account to compute the Variation can be
adjusted using the parameter Depth.
Time The stop criteria is met when the elapsed time reaches the Max. time parameter.
Max. time The parameter Max. time is the maximum time allowed to reach the target. If Time is not
the type of stop criteria, then when this delay has elapsed, the measurement stops and the
message aborted is displayed.
Time filter The time filter allows you to filter the stop criteria. The sample mode is stopped when the
stop criteria is fulfilled for a time greater than the parameter Time Filter.
As an example, if criteria is set to Above threshold and Time Filter is set to 10 sec. the
measurement stops when the gas concentration is above the threshold for more than
10 seconds.
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