Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
34
ASCII Command to initiate a 2-Point Buffer Calibration
Function
Command
Explanation
2-Point Buffer
CALPH2PB 0
Initiates 1
st
point of a 2-point buffer calibration
CALPH2PB 1
Initiates 2
nd
point of a 2-point buffer calibration
All Calibration Commands will respond with “OK” if accepted and “ERROR” if not accepted
The status of the calibration can be reviewed with the CALSTATUS command. When the last number returned is a 1,
the calibration is in process. When the last number returned is a 2, the calibration has been successful. Any other number
indicates a specific failure mode (see appendix).
4 . 1 . 3 . 3
2 - P O I N T S A M P L E M E T H O D
Select 2-POINT SAMPLE from the calibration menu to begin the calibration sequence.
If buffer standards are not available or if it is desired to calibrate to process values, the 2-point sample calibration method may
be appropriate. This calibration method requires the input of desired values for a given measurement. The points must be 3 pH
units apart and the readings must be stable before calibration can be successful.
When the 2-point sample method is chosen, the status box will prompt the user to enter the desired calibration value. Stable
temperature and sensor readings will help to establish an accurate calibration.
Once the desired value for calibration is entered, the CALIBRATE button becomes active. Once the displayed sensor and
temperature values are stable and near expected values, click the CALIBRATE button to initiate the calibration of the first sample
point or click EXIT to return to the main measure screen.
