Thermo Scientific AquaSensors™ DataStick™ Measurement System User Guide
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4.5.4 Zero Calibration
This calibration should not be initiated without a reliable zero reference.
Place the sensor in a solution from which all dissolved oxygen has been removed.
ASCII Command to Initiate a Zero Calibration
Function
Command
Explanation
Zero calibration
CALSZERO
Initiates a zero calibration for the DO sensor
4.5.4
Dissolved Oxygen Maintenance
Care must be taken when cleaning a DO sensor. The membrane is only a few thousands of an inch thick and can be punctured
or stretched by excessive pressure.
•
Rinse off as much material as possible with a spray of warm, clean water. Soaking in water and detergent may loosen
additional material. Use a cleaner that does not contain oily hand softeners such as aloe or lanolin. Powdered Alconox™
and Dawn™ work well.
•
Clean off left over material by wiping with a soft cloth or paper towel and clean water. A bristle brush is not recommended.
•
If the membrane is worn or punctured, replace the membrane cartridge as shown in the following figure.
4.6
Turbidity
When a Turbidity system is installed, the DataStick automatically sends measurement information in NTU. Temperature is also provided.
All ASCII commands for measurement, calibration, configuration and diagnostics shown in Appendix 7 apply. For Drinking Water Turbidity
Systems, an AV38 local interface is provided. Refer to the AquaClear™ Low-Range Turbidimeter User Guide (258483-001) for details.
