Hach ORBISPHERE 3100 Manuel D'utilisation Simplifié page 17

Option Description
Storage Define the interval for storing measurements from the list available.
interval
The interval is in seconds with the number of hours of measurements available
shown in brackets e.g. 10s (16h) indicates measurements are stored every
10 seconds, which will give 16 hours of continuous storage
Note: This parameter also defines the refreshment rate for the graphic measurement
display.
Clear data Select this option to erase the measurement storage file
2. Communication
Option
RS232
Baud rate
3. Miscellaneous
Option
Miscellaneous This option allows the default measurement configuration parameters to be
6.3 Calibration
6.3.1 Barometric sensor calibration
1. The upper box shows the current barometric pressure as measured by the instrument. Using a
precision certified barometer, measure the barometric pressure in the location where the
instrument is used. If the values differ, enter the correct value in the box provided and select
Validate calibration
6.3.2 Gas sensor calibration
There are two calibration modes available
• Zero calibration
• High level adjustment
The zero calibration method is the best method to guarantee the sensor specifications.
To get more accurate measurements for samples with higher oxygen concentrations (above 1%
oxygen which corresponds to about 400 ppb dissolved O
using a gas mixture containing 2% oxygen. However, this should not be done without first ensuring
the zero point is accurate (i.e. by performing a zero calibration first).
6.3.2.1 Zero calibration
1. Rinse flow path with 20 mL of ethanol (EtOH) using the syringe and connectors supplied in the
tool kit
2. Connect a cylinder of oxygen free gas (minimum 99.999% purity) to the instrument and adjust the
flow to approximately 100 mL/min
3. Let the oxygen free gas run through the instrument for 5 minutes
4. Press the Enter key to start the calibration
5. Wait until the Signal in range and Stability reached fields display Yes which indicates the
calibration is within acceptable limits. The Calibration possible field should also display Yes at
this point. Press the Enter key to complete the calibration
6. Accept (OK) or reject (Cancel) the new calibration data
Description
Check the box if the RS232 link is required
Select the baud rate from the list available
Description
restored
) a high level adjustment can be performed
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