Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
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4.1.3
pH
Calibration
When a pH sensor is connected to the DataStick, calibration choices specific to pH are automatically available. After a calibration,
the sensor-head can be moved to another DataStick and measurement accuracy will be maintained. For the most accurate measurements
a 2-point buffer calibration should be performed.
Sensors are calibrated at the factory. When field calibrations are necessary, 1-point buffer, 2-point buffer, 1-point sample and 2-point
sample calibrations are available.
4 . 1 . 3 . 1
1 - P O I N T B U F F E R M E T H O D
Select 1-POINT BUFFER from the calibration menu to begin a calibration in a known buffer standard.
In a buffer calibration, the DataStick assumes that the sensor has been placed in a pre-defined buffer standard and automatically
equates the current reading to the closest standard value. For a 1-point pH buffer calibration, instructions are shown in the status
box on the left side of the calibration screen. The sensor and temperature values are shown on the right side of the screen.
Place the pH DataStick sensor into the buffer solution. Wait for the sensor and temperature readings to stabilize. Press the
CALIBRATE button and the sensor will begin the process of changing the current pH reading to the closest buffer standard
reading as defined by the buffer standard selected.
Once the calibration has been initiated it will take between 30 seconds and 2 minutes depending on sensor and temperature
measurement stability. During this period, the abort sequence can be initiated as shown with the active Abort button.
