Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
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Units shown in the temperature units window are active. To change units or to review options, scroll the selection list. Click on the
desired units of measure to place the new choice in the sensor units window. To accept the change, click OK. To abort the
change, click CANCEL.
Temperature can be displayed in °C or °F. Default units are °C.
ASCII Commands to View Temperature units
Function
Command
Response
Explanation
View Temperature Units GTUNITS
0
Data reported in °C
1
Data reported in °F
ASCII Commands to Set Temperature units
Function
Command
Explanation
Set °C
STUNITS 0
Sensor data will be reported in °C
Set °F
STUNITS 1
Sensor data will be reported in °F
All Set Commands will respond with “OK” if accepted and “ERROR” if not accepted.
4.2.3
ORP Calibration
When an ORP sensor is connected to the DataStick, calibration choices specific to ORP 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 a 1-POINT SAMPLE calibration can be done when the sensor
is in process liquid. The ORP measurement is not compensated by temperature. Temperature is offered as an independent measurement.
4 . 2 . 3 . 1
1 - P O I N T S A M P L E C A L I B R A T I O N
Select 1-POINT SAMPLE from the calibration menu to begin an ORP calibration.
When the 1-point sample method is chosen, the status box will prompt the user to enter the desired calibration value. Use
calibration solutions with millivolt potentials that are similar to those used in the process measurement. Solutions of opposite
polarity may react on the sensor electrode and cause it to foul.
