Calibration Of Ph And Redox Sensors; Calibration Of The Ph Sensor - Swann Chematest 35 Operator's Manual

Chematest 35
Maintenance
9.3.
9.3.1
Calibration
solutions
Procedure
Calibration
errors
History
A-96.730.121 / 160920

Calibration of pH and Redox Sensors

Calibration of the pH Sensor

The calibration is carried out using two calibration solutions. The in-
strument is factory programmed for the use of calibration solutions
with pH 7 (standard 1) and 9 (standard 2) supplied by Swan.
If other calibration solutions are used, the corresponding tempera-
ture curves can be entered under <Settings>/<Sensors>/
<Electrode>/<pH>/<Standards>.
Use the standards at room temperature. Be careful not to inter-
change the bottle caps of the standards.
1 Plug the sensor cable into the sensor socket.
2 Select <Menu>/<Maintenance>/<Calibration>/<Electrode>/
<pH> and follow the instructions on the screen.
If the calibration is aborted with the message "Offset error!" or
"Slope error!":
 Make sure that the correct standard solutions have been
measured in the correct order.
 Carefully clean the sensor tip with a paper tissue.
 Repeat the calibration with new standard solutions.
If the above steps do not help, the sensor is defective and must be
replaced.
The calibration history of the pH sensor is stored in the internal
memory of the Chematest 35 and can be reviewed in <Menu>/
<Data Storage>/<Calibration History>/<Sensors>/<pH>.
Up to 64 calibrations are memorized. Then the oldest calibration is
deleted to save the newest one.
29