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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