Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
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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.
.
When the point has been successfully calibrated, measured values will be based on the new calibration. The rate
of change in reading from the old measured value to the new will be dependent on the sensor filter value that is entered
in the configuration menu.
Exiting the calibration menu will return the user to the measure screen.
ASCII Command to Initiate a Toroidal 1-Point Sample Calibration
Function
Command
Explanation
1-Point Sample
CALS1PS
Initiates a 1-point calibration of toroidal sensor
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).
4.4.4
Toroidal Conductivity Maintenance
Unlike contacting conductivity where the electrodes must be kept clean of oil and other deposits, toroidal cells are not bothered by thin
coatings. In some processes however, surface deposits may become thick enough to cause a change in cell constant by constricting the
electric field around the cell. They must then be removed. All things being equal, deposits in the center bore are more important to remove
than those on the outer part of the body.
Use an appropriate chemical to remove the deposits on the cell and/or scrape the deposits off.
