Water Quality Sensor Accuracy of temperature compensation
± 0.3 mg/L
Water Quality Sensor Calibration period
Six months
Water Quality Sensor Temperature range
(0 ~ 60) °C
Water Quality Sensor Protection level
IP68
Water Quality Sensor MTBF
≥1440h/Time
Water Quality Sensor Means of communication
RS485(Modbus RTU) , maximum baud rate 115200 bps
General Knowledge of Dissolved Oxygen
Tips:Measuring Dissolved Oxygen by the Titrimetric Method
The titrimetric method for dissolved oxygen analysis is known as
the Winkler method. This method was developed by L.W. Winkler, a
Hungarian chemist, in 1888. Also known as the iodometric method,
the Winkler method is a titrimetric procedure based on the
oxidizing property of dissolved oxygen. This method has long been
the standard for accuracy and precision when measuring dissolved
oxygen.
Winkler Method
Samples are collected, fixed, and titrated, either in the field or
in a lab. The sample should be fixed with the reagents as soon as
possible to prevent oxygen levels from shifting due to agitation or
atmospheric contact. The Winkler method requires a specific bottle,
known as a BOD bottle, which is designed to seal without trapping
air inside. Today, the reagents required can come in pre-measured
packets for greater accuracy and ease of use. When using this
method, the amount of titrant needed to complete the reaction is
proportional to the dissolved oxygen concentration of the sample.
While the Winkler method is still a recognized standard for
analyzing dissolved oxygen, several concerns have been identified.
This method is subject to human error, inaccuracies, sample
contaminants and interferences. In addition, titrations can be
time-consuming, and cumbersome in the field.
Modified Winkler Methods
The basic steps of measuring dissolved oxygen by the Azide-Winkler
titration method.
Now seven modified Winkler methods exist, each created to respond
to a different issue (such as an interfering contaminant). The most
popular of these is the Azide-Winkler method, as it addresses the
issues with iodine present in the original method. However, the
rest of the modified methods create a new concern – these methods
require prior knowledge of the sample (such as other elements
present) in order to make the appropriate choice of method.
If one has the time and the inclination, the titrimetric method for
dissolved oxygen analysis can be accurate and precise. However, new
technologies have created dissolved oxygen sensors that are easier
and quicker to use and can be just as accurate in most
applications.
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