Channel Calibration
MXD70 pH / Redox
Setup and Operating Guide
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Channel Calibration
Auto pH Sensor Calibration
The Auto pH sensor calibration is a two point offset and slope calibration, which requires the use of
two pH buffer solutions chosen by the user. These are nominal values from which the instrument
converts to exact buffer values due to temperature variations. To accomplish this, the instrument
requires buffer values at different temperatures relevant to the buffer solutions chosen to be
configured, refer to page 37 for the custom buffer instructions.
Alternatively the default configuration uses 4 and 9 pH buffer solutions with the buffer table pre-
configured with the following two LTH buffers:
4pH – LTH Order Number 138/199
9pH – LTH Order Number 138/201
In order for the auto calibration to work correctly, the buffer temperature must either be measured by
the instrument during calibration, or if manual temperature compensation is being used the buffer
temperature must be entered in the “Calibration Manual Temperature Input” in the calibration menu.
Calibration Principle
To use Auto calibration first set the calibration
principle to Auto.
Note. Calibration Principle is only available when
units are set to pH and probe type to glass, both in
the channel setup menu.
/ – Select Option
EXIT
– Cancel
– Save Selection
pH Auto Calibration
To start the pH calibration, select the “pH Calibration”
item from the desired channel’s calibration menu.
/ – Select Option
EXIT
– Return to Select Calibration Channel
– Enter pH Auto Calibration
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