Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
78
ASCII Command to View Concentration Table Entries
Function
Command
Response
Explanation
Get Point from
working table
GUPNT X
Conductivity, Concentration
X is a point from 0 to 9
Get point from
scratch table
GSPNT X
Conductivity, Concentration
X is a point from 0 to 9
ASCII Command to Set a Concentration Table Entry
Function
Command
Explanation
Set Point in
scratch table
SUPNT X Y Z
X=point number. Y=conductivity in
μ
S/cm, Z=concentration in %
This function will put individual points in “temporary memory”. Entries
will not become active until the full table is set with the SUTBL
command.
Set Table
SUTBL
Activates new point entries.
Will return ERROR if stored points for new table are not valid.
Will return OK if the new table is accepted.
All Set Commands will respond with “OK” if accepted and “ERROR” if not accepted
4.4.3
Toroidal Conductivity Calibration
When a toroidal sensor is connected to the DataStick, calibration choices specific to toroidal conductivity are automatically available.
After a calibration, the sensor-head can be moved to another DataStick and measurement accuracy will be maintained.
Sensors are calibrated at the factory. When field calibrations are necessary the ZERO calibration can be made when the sensor
is dry and out of the process. 1-POINT SAMPLE calibration can be done when the sensor is in process liquid.
4 . 4 . 3 . 1
Z E R O C A L I B R A T I O N
Select ZERO from the calibration menu to begin the toroidal conductivity zero calibration.
A zero calibration is applied to a sensor placed in dry air. The calibration establishes the zero for the measurement system
and will require more than 1 minute to complete. Please be patient.
Suspend the sensor in dry air, away from surfaces. Be sure that the sensor body is dry by wiping it clean with a dry rag.
For best results, wait for the sensor reading to reach a steady state. If the sensor is being calibrated for the first time,
the reading may be as high as 100
μ
S/cm. In most situations however, the sensor will already have a zero calibration
stored in it, which may require some periodic adjustment.
