Polymetron 9582 dissolved oxygen analyzer
- typical application
Power plants, semiconductor plants, etc., are suitable for the analysis of dissolved oxygen at low concentration (ppb) such as deaerated water.
-Features and benefits
The pre-installed membrane module only needs a few seconds to replace the membrane
Low detection limit
Quick calibration process: calibration from ppm (air) to ppb (process) can be completed in less than 15 minutes
The universal 9500 controller is used for easy integration and simple installation.
- working principle
The measurement of dissolved oxygen is based on the well-known Clark battery principle. The oxygen-permeable membrane isolates the water sample from the electrode, so there is no need to adjust the sample. Since other reducing or oxidizing ions cannot pass through the gas-permeable membrane, they will not cause interference.
A constant voltage is applied to the two electrodes to keep the potential of each electrode constant. The gold working electrode (cathode) reduces dissolved oxygen to hydroxide ions:
O2 + 2H2O + 4e--> 4OH
The oxidation reaction takes place on the surface of the large silver electrode (anode):
4Ag + + 4Br--> 4AgBr + 4e-
The oxidation-reduction reaction produces a diffusion current, which is proportional to the dissolved oxygen concentration.
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|Measuring range||0 ~ 2000 ppb（0-2 ppm）|
|Minimum detection limit||< 1 ppb|
|unit||mg/L, ppm, μg/L, ppb, mbar, hPa,inch Hg, mmHg|
|Repeatability||± 0.5 ppb or ± 5%, whichever is greater|
|Reproducibility||± 0.5 ppb or ± 2%, whichever is greater|
|Response time||For 1-40 ppb step change the value is: <30 seconds|
|Maintenance interval||Membrane life: 6 months, depending on the sample|
|range of working temperature||-20 ~ 60 ° C (0 ~ 95% RH, non-condensing)|
|Temperature compensation||Automatic compensation within 0 ~ 45 ° C (32 ~ 113 ° F)|
|connection||1/4 inch NPT threaded connection (6mm or 1/4 inch pipe is recommended)|
|Sample flow grade||I ~ 333 mL / from 4 ~ 10 l / hr）|
2LDO® II dissolved oxygen probe