Hanna Instruments network-compatible oxygen meter with optical probe HI6421
This model is a state-of-the-art laboratory meter for the precise measurement of dissolved oxygen levels in fresh and salt water. Developed for applications where reliability, reproducibility and ease of use are crucial, it impresses with its optical probe and extensive network capability. Similar to [Hanna Instruments HI9147], it also uses a robust, low-maintenance electrode that is particularly suitable for continuous measurements in professional laboratory environments.
Performance features and advantages
This networkable instrument offers reliable measurement of %saturation, mg/l and ppm for dissolved oxygen (DO) as well as special parameters such as BOD, OUR and SOUR. The optical oxygen probe is based on the principle of fluorescence quenching, in which a light-sensitive luminophore shows a measurable reaction when in contact with oxygen. Thanks to this method, the typical problems of electrochemical sensors such as membrane or electrolyte maintenance are eliminated. Another major advantage is that the integrated smart cap technology saves the calibration data and transmits it directly to the probe, which makes handling in the laboratory noticeably easier.
The measuring device can be quickly integrated into the existing laboratory IT system thanks to the WLAN and Ethernet connection. Protocols can be recorded automatically and saved in various formats such as CSV or sent by email. The integrated data storage enables the recording of up to one million data points, so that even long-term tests can be documented without gaps. The 7-inch capacitive touchscreen, intuitive user interface and the option to connect both external keyboards and USB sticks via USB create an all-in-one solution.
Precise technology for demanding requirements
The following list of key points summarizes some of the most important technical data:
- Measuring range for dissolved oxygen: 0.0 to 500.0 % saturation, 0.00 to 50 mg/l
- Accuracy up to ±1.5 % of the measured value (depending on range)
- Measuring modes: BOD, OUR, SOUR
- Automatic barometer and salinity compensation
- Data logging with automatic interval; export via USB, e-mail or FTP
- Simple one- or two-point calibration
- Wi-Fi & Ethernet for direct networking
In addition, the device is equipped with a barometric air pressure measurement function that can record values from 450 to 850 mmHg. This direct compensation ensures even more accurate DO values, especially when air pressure and temperature conditions change frequently. Temperature-dependent compensation can be carried out either with an internal sensor or manually, which is an advantage for special test series.
Thanks to its robust and easy-to-clean housing, the instrument is ideal for laboratory environments that place high demands on safety and hygiene. It is CE-compliant and therefore meets current standards, which ensures safe use in Germany and other European countries. Various stability criteria such as "Precise", "Medium" and "Fast" can be selected so that the measuring intervals can be flexibly adapted to the respective applications.
Application examples
- Research laboratory for environmental samples: The optical probe can be used to determine dissolved oxygen in river or lake water samples in order to monitor aquatic living conditions.
- Aquaculture: In fish tanks and rearing ponds, accurate oxygen monitoring is essential to promote growth and reduce losses.
- Wastewater treatment plants: Accurate measurement of dissolved oxygen levels is required to control BOD and OUR in aeration processes.
- Brewing industry: Certain production steps require reliable oxygen measurement to ensure the quality of beverages
FAQs
How often does the optical DO probe need to be calibrated?
As a rule, a one or two-point calibration is sufficient, depending on the application. Calibration data is saved thanks to the smart cap technology, which minimizes the need for frequent calibration.
Can the device be used to measure in salt water?
Yes, thanks to automatic salinity compensation, it is ideal for seawater applications without the need for external conversion.
Is it possible to record long measurement series?
Yes. The integrated logging function allows you to save at least one million data points, which can be logged automatically or manually and exported via USB, FTP or email if required.
How to set the barometer compensation
The device calibrates the barometric pressure range automatically or manually if desired, so that precise oxygen measurements are possible even at changing altitudes or weather conditions.
Which alarm functions are integrated
An acoustic alarm can be triggered for values outside of definable limit values. This warns users immediately if, for example, critical oxygen concentrations are reached.
Conclusion
This laboratory measuring device combines optical oxygen measurement, extensive network functions and high-resolution touchscreen operation in a single platform. The precise and stable measurement of DO values in fresh and salt water as well as automatic compensation for air pressure and salinity make it a versatile instrument. Thanks to extensive data storage and export options, the device is suitable for demanding research projects as well as routine tasks in everyday laboratory work. This equipment provides professionals with a measuring system that impresses with its accuracy, reliability and convenient operation.
