Hach-Lange ORBISPHERE 410 User Manual - Manual (Page 53)

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Calibration Menu
7.1 Definitions
7.2 EC gas sensor calibration
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:
1.
In Air: For Oxygen and Ozone with an EC sensor.
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.
Note: All the calibration information for a smart EC Sensor is stored in the sensor’s memory. When a
smart sensor is connected to the instrument for the first time, a calibration report (see example in
Calibration reports on page 54 ) is automatically generated giving the details of the last calibration.
If the sensor being calibrated is an EC sensor, follow the instructions in the next section entitled EC gas
sensor calibration . For TC sensors, refer to TC gas sensor calibration on page 53 .
Calibration of the measured gas
Start 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.
Note:
When calibration is started, a calibration event is set, and the analog
output and relay are put on hold (if selected below) to avoid unwanted alarms
or potential process problems. This resumes when calibration is finished.
Modify calibration
parameters • 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.
• Liquid : Select as appropriate, available when liquid has been selected
in medium (above).
• Enter the gas concentration according to the value in the calibration
media, when direct value is used
• Hold during calibration : On by default, this stops any output from the
instrument during the calibration process to avoid sending invalid
information to any connected device.
Press OK to start calibration