Sensor Calibration; Initial Sensor Calibration - Hach ORBISPHERE G1100 User Manual

Calibration Menu

7.1 Sensor calibration

The sensor can be calibrated either automatically at pre-defined intervals, or manually on an ad
hoc basis. There are two calibration modes available - zero or high-level adjustment. The zero
calibration method is the best calibration method to guarantee the sensor specifications.
However, for higher level concentrations (such as 1% oxygen which corresponds to about 400
ppb dissolved O
By default, the mode is set to zero calibration with auto-end (refer to
page 58
Hach Lange recommends that the sensor be calibrated on an automatic basis at regular
intervals.
Note: For zero calibrations, ensure a bottle of pure nitrogen gas is attached to the flow chamber as
described in
bottle is used, and calibrations are automated on a monthly basis, you should only have to change this
bottle once every three years.

7.1.1 Initial sensor calibration

After the instrument and sensor have been installed and configured, an initial calibration of the
sensor must be performed. Before starting the calibration, wait at least 10 minutes with sample
flowing through the system to ensure temperature equilibrium.
Select the Configuration option from the main sensor calibration menu to check the calibration
parameters.
Exit from the configuration screen by pressing on OK. Then select Calibration from the main
sensor calibration menu and perform a manual zero calibration as described in
on page
After a successful calibration, return to the configuration option (illustrated above) and enable
auto-calibration. Select the Auto-calibration Configure option and set the number of days
between calibration to 30 for applications less than 50ppb, or 90 for applications greater than
50ppb. Refer to
ensure an automatic calibration cycle.
Note: There is no need to disable the manual calibration auto-end feature.
56
) a high-level adjustment can be performed.
2
for detailed information), but these parameters can be changed.
Calibration gas on page 38
60.
Configure automatic calibration on page 59
and with the specifications defined in that same chapter. If a 34 liter
Ensure the parameters are set up to their default values as
illustrated left:
Auto-calibration: Off by default.
•
Manual-calibration Auto-End: On by default.
•
Hold during calibration or verification: On by default.
•
Zero calibration bottle: On by default.
•
New bottle: 34 liters by default. if using a different size
•
bottle then update this parameter to reflect the size of the
bottle and press Apply.
Calibration configuration on
Zero calibration
for detailed information. This will