H87.0.0X.6C-01
Operating manual G 7500 Series
page 30 of 34
9
Calibration
9.1 General information
Each channel that supports a calibration will show cal. Above the F1-key.
The Calibration will only be available when the logger is set to
“not active”.
When you press the F1-key the calibration wizard will guide you through the
calibration steps. Depending on the channel you will need to have buffer solutions
prepared.
More point calibration can be done (if supported from the measuring channel) after
the 1
st
calibration point is finished.
You don’t need to select how many points should
be calibrated and you don’t need to follow a predefined order of buffer values, you
can just use them in random order.
9.2 pH calibration
Required Accessories:
Buffer solutions (e.g. the PHL buffer solutions with ph 4, ph 7 and ph 10)
deionized water for cleaning between changing buffer solutions
If necessary, liquid thermometers to determine the temperature of the buffer solutions
(if no GE 125 or similar is used)
Start the calibration process, see above.
Follow the instructions of the device:
Clean the electrode and immerse it in the first buffer solution.
After the buffer solution has been determined, continue with the next buffer solution
or complete the calibration.
A certain sequence of buffer solutions is not specified.
If no temperature reference is present, the temperature of the buffer solution must
also be determined with another measuring instrument and entered.
The electrode evaluation after completion of the calibration process informs about the
state of the electrode.
9.3 O
2
calibration
Required Accessories:
GCAL 3610 calibration vessel for oxygen sensor, alternatively use a moist cloth.
deionized water for cleaning the sensor.
Start the calibration process, see above.
Follow the instructions of the device:
Clean the sensor and plug it into GCAL 3610.
Alternatively, wrap the sensor loosely into a moist cloth.
The sensor evaluation after completion of the calibration process informs about the
state of the sensor.
