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Chematest 35
Maintenance
9.3.2
Calibration of the Redox Sensor
Calibration
solution
The instrument is factory programmed to use the 475 mV standard
solution supplied by Swan.
If a different standard solution is used, enter the mV value under
<Settings>/<Sensors>/<Electrode>/<Redox/ORP>/<Standards>.
Use the standard at room temperature.
Procedure
1
Plug the sensor cable into the sensor socket.
2
Select <Menu>/<Maintenance>/<Calibration>/<Electrode>/
<Redox/ORP> and follow the instructions on the screen.
Calibration
errors
If the calibration is aborted with the message “Offset error!”:
Make sure that the correct standard solution has been measured.
Carefully clean the sensor tip with a paper tissue.
Repeat the calibration with a new standard solution.
If the above steps do not help, the sensor is defective and must be
replaced.
History
The calibration history of the redox sensor is stored in the internal
memory of the Chematest 35 and can be reviewed in <Menu>/
<Data Storage>/<Calibration History>/<Sensors>/<Redox/ORP>.
Up to 64 calibrations are memorized. Then the oldest calibration is
deleted to save the newest one.
