Hach ORBISPHERE 51 Serie Manuel D'utilisation Simplifié page 18

7.3.1.4.1 TPO and TPA parameters (portable instrument)
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.
7.3.1.5 Stop criteria configuration (portable instrument)
Available in Sample measurement mode, this setting allows configuration of the stop criteria for
each channel.
Note: The parameters available for configuration depend on the type of stop criteria being defined.
1. Select Menu / Main / Configure chan x and press 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
Time The stop criteria is met when the elapsed time reaches the Max. time parameter.
Note: The number of samples taken into account to compute the Variation can be
adjusted using the parameter Depth.
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.
7.3.2 Measurement configuration
1. EC sensor
Option
Membrane
Medium
Gas unit type
Gas unit
Liquid
18 English
Description
Sensor's membrane number selection.
Liquid or gas phase.
Partial, Fraction, Dissolved.
The list of available units depends on unit type selected above.
Note: This is the gas concentration measured by the EC sensor. When a composite unit
is selected (e.g. ppm » ppb) the unit will change depending on the range of the value to
display.
When medium is liquid, select water or a liquid with a different solubility (if available).