i)If you wish to change the measuring unit to ppm, press CALL a number of times to return to “%sat/ppm” and change ppm with the down button.

j)Press RUN to return to on line measurement.

NOTE: If a major change is necessary to make the display read 100% the display will flash when you press ENTER. This is to warn that you may have made a mistake such as using “stale” water. If you are confident your procedure was correct, press ENTER a second time. Otherwise, repeat the calibration procedure by pressing CALL a sufficient number of times to go through the menu and return to CALIBRATION.

5.4Analog Output Range Expand

5.4.1The 4-20 mA isolated analog output may be spread over any section of the scale as long as that section is at least 10% of full scale. The best way to describe this setup is by example. Suppose you wish the 4-20mA output to span 5 ppm to 10 ppm. Proceed as follows:

a)Press CALL as many times as required until OUTPUT HIGH is indicated. Now use the arrows to make the meter read 10 ppm. Press ENTER. The display will flash until ENTER is pressed again to confirm entry.

b)Press CALL once to indicate OUTPUT LOW. Now use the arrow buttons to make the meter read 5 ppm. Press ENTER twice as above.

c)The analog output will now be at 4 mA when the D.O. of the solution is 5 ppm and will increase to 20 mA when the D.O. of the solution is 10 ppm.

d)Press RUN to place the instrument on line or press CALL for another menu selection.

e)To invert the output (i.e. decreasing output for increasing process value) simply adjust for 4 mA on OUTPUT HIGH and for 20 mA on OUTPUT LOW.

NOTE: A range expand of less than 10% of full scale is an invalid entry which will be indicated by the LED flashing when you return to RUN. To correct, return to the menu and correct the output settings.

5.5Test

5.5.1To test your setup press CALL the number of times required to indicate TEST. Now by using the arrow buttons you can “sweep” through the digital display.

5.5.2With the instrument in TEST you can check the analog output at any desired reading with a meter connected to the appropriate output terminals.

5.5.3Another use of this feature is to check the stability of the system. When in TEST, use the arrow buttons to select any value, say 10 ppm. Now return online by pressing RUN. Return to the meter some hours or days later. Press CALL to indicate TEST. If the instrument is still in calibration and if no one has interfered the meter should read 10 ppm.

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Omega Engineering Dissolved Oxygen System, DOCN600 manual Analog Output Range Expand, Test
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DOCN600, Dissolved Oxygen System specifications

Omega Engineering has set a standard in the field of environmental testing and monitoring with its advanced Dissolved Oxygen System, the DOCN600. This sophisticated device is engineered for precision and reliability, making it a preferred choice for various applications, from wastewater treatment to aquaculture, and laboratory settings. The DOCN600's primary mission is to accurately measure dissolved oxygen levels, a critical parameter in assessing water quality and supporting aquatic life.

One of the standout features of the DOCN600 is its state-of-the-art optical dissolved oxygen sensor technology. Unlike traditional Clark-style electrochemical sensors, which can be subject to interference and require frequent calibration, the optical method uses luminescence to measure oxygen levels. This technology offers several advantages, including lower maintenance requirements, enhanced stability, and improved accuracy over a broad range of conditions.

The DOCN600 boasts a user-friendly interface, complete with a high-resolution LCD display that provides real-time data visualization. Users can access multiple display modes, allowing for quick reference of key metrics, including temperature and oxygen saturation levels. Furthermore, the system is designed with intuitive menus that facilitate easy navigation, ensuring that both seasoned professionals and beginners can operate the device with confidence.

For data management, the DOCN600 is equipped with advanced connectivity options, including USB and RS-232 ports. This allows for seamless integration with external devices and enables users to export data for further analysis. Coupled with its internal memory, which can store extensive historical data, this system empowers users to monitor trends over time, aiding in decision-making processes.

Another notable characteristic of the DOCN600 is its robust build quality, ideal for deployment in various environmental conditions. The system is engineered to be resistant to water, dust, and harsh chemicals, ensuring longevity and reliable performance even in challenging environments. Additionally, with its compact and portable design, it can be conveniently used in field applications as well as in stationary setups.

In summary, the Omega Engineering DOCN600 Dissolved Oxygen System combines cutting-edge optical technology, user-friendly features, advanced connectivity, and a durable design. It stands out as an invaluable tool for anyone needing precise and reliable dissolved oxygen measurements. Whether used in research, environmental monitoring, or industrial applications, the DOCN600 is an excellent investment for achieving accurate water quality assessments.
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