Hach Ultra ORBISPHERE 511 Quick Manual page 8

General
We define 2 types of calibration:
• the calibration of the gas to measure
• the calibration of interferences
To calibrate the gas to measure (main gas), the
user usually puts the sensor in the main gas
without any interfering gas.
To calibrate the interferences, the user usually
puts the sensor in the interfering gas without any
of the main gas.
Calibrations can only be performed once the
instrument has been installed, configured and
each 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, and then select which channel must be
calibrated (option).
There are two types of gas sensor calibration
available, depending on the gas being measured
and the type of sensor in use:
1) In Air: For Oxygen and Ozone
2) Direct value: Any gas. 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
Before initiating a calibration process, the
calibration parameters must be set by pressing on
the Modify button. Last calibration parameters
are memorized, so this step can be ignored if
correct parameters are already set.
Page 8
Calibration
Modify Calibration Parameters
• Calibration mode: 2 types available,
depending on the gas being measured:
• Direct value: Any gas
• In Air: For O
• 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
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.
• Interference enabled: If selected, this
takes into account the influence of
interferences during calibration. By
default the same interferences as during
measurement is selected
Press OK to start calibration
or O (default)
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