Hach Orbisphere 510 Manuel D'utilisation De Base page 17

• The relays and the analog outputs are updated
• Measurements are continuously stored in memory (volatile and non volatile memory) according to
individual settings
7.3.1.2 Continuous mode selection
1. Select Config. instrument from the Measurement menu:
Option
Measurement mode
Pressure
Temperature
7.3.2 Measurement configuration
1. EC sensor
Option
Membrane
Medium
Gas unit type
Gas unit
Liquid
Display
resolution:
Thermal cutoff:
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.
7.3.3 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.
Description
Measurement mode is locked on Continuous
for on line process.
Select the barometric pressure units.
Select the temperature units.
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).
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.
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.
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