Hach-Lange ORBISPHERE 510_51x Basic User Manual - Manual (Page 16)

Option Description
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.
Measurement configuration
1. EC sensor
Option Description
Membrane Sensor’s membrane number selection.
Medium Liquid or gas phase.
Gas unit type Partial, Fraction, Dissolved.
Gas unit 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.
Liquid When medium is liquid, select water or a liquid with a different solubility (if available).
Display
resolution: Maximum resolution depends on gas, membrane and unit. A maximum of 5 digits can be
displayed. Decimals can be limited to 0, 1, 2 or 3 decimals for easier reading. That does
not affect the actual resolution of data measured and stored, but only the data displayed.
Thermal cutoff: To protect the sensor, the thermal cutoff function allows for setting a sample high
temperature limit. If exceeded (during a Cleaning In Place cycle for example) the
electrical signal to the sensor is cut off, the measurement session is suspended and the
system displays a HOT alarm message. The system resumes when temperature drops
to 90% of the specified cutoff temperature.
• Thermal cut off options: Disabled / enabled.
• Thermal cut off temperature: To be set according to conditions.
2. TC sensor
The measurement configuration for a TC sensor is the same as for an EC sensor with the
addition of one extra selection criteria:
• Purge gas: From the drop-down list, select the purge gas being used for the TC sensor.
Measurement alarms configuration
Set the thresholds for the low/high concentration levels according to the application.
1. Select the Alarms button on the Measurement configuration screen:
Option Description
Low Low 2nd stage for too low concentration alarm.
Low 1st stage for too low concentration alarm.
High 1st stage for too high concentration alarm.
High High 2nd stage for too high concentration alarm.
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