Hach-Lange ORBISPHERE 410 Basic User Manual - Manual (Page 19)

Option Description
FLASH time The delay between two data file transfers from volatile memory into non-volatile
memory. The last data file erases the previous one. This option is only available if
the Auto save in flash box is checked.
Save in flash now Press this button to store measurement data in flash immediately. After pressing
this button, press OK to initiate the process. A warning screen appears informing
you that the operation can take up to 30 seconds. Press Yes to continue or No to
abort.
Auto save in flash Check this box to save measurements in flash automatically. Measurements are
saved at regular time intervals as defined in the FLASH time box.
Purge data Clear all data in the volatile and non-volatile memories.
Start logging
measurements Only available in Store once mode, this option starts or stops the measurement
recording session. Measurement recording ends automatically when the buffer is
full.
Open data Opens a table showing the measurments stored in the volatile memory (RAM).
Calibration
Calibrations can only be performed once the instrument has been installed and configured.
Note: The temperature sensor is factory calibrated and can only be changed by a Hach Lange representative.
Definitions
To calibrate the gas to measure (main gas), the user usually puts the sensor in the main gas without
any interfering gas.
Calibrations can only be performed once the instrument has been installed, configured and the
channel has been set up. You must also ensure that you have the correct access rights to access the
calibration menu.
Select sensor calibration from the calibration menu.
There are two types of gas sensor calibration available, depending on the gas being measured and
the type of sensor being used:
1. In Air: For Oxygen and Ozone with an EC sensor. The sensor is exposed to air at atmospheric
pressure.
2. Direct value: Any gas with either an EC or TC sensor. This calibration exposes the sensor to a
gas with a known partial pressure, or a liquid sample with a known gas concentration.
EC gas sensor calibration
Calibration of the measured gas
1. Before initiating a calibration process, the calibration parameters must be set by pressing on the
Modify button. The last calibration parameters are memorized, so this step can be ignored if the
correct parameters are already set.
Option Description
Calibration mode 2 types available, depending on the gas being measured:
• Direct value: Any gas
• In Air (default): For O
2
or O
3
Medium Select liquid or gas (direct calibration only)
Concentration unit type Partial, fraction or dissolved (dissolved is for calibration in a liquid only)
Concentration unit The list of available units depends on unit type selected above.
English 19