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3290 - Percent Oxygen Analyzer
We have a brand new model 3290 that runs for a few hours and then looses its calibration, driving the reading high, shutting down our Nitrogen membrane plant. It read ~6 - 7%, and then the reading went to over 40% Oxygen. It is impossible to be over 21%. We can calibrate it over and over, but it keeps doing the same thing. Why? There are several possibilities. How are you calibrating the sensor? Are you calibrating it in open air or against a standard cylinder of gas? If somehow the cylinder or calibration method is flawed, theses are the results you might get the other possibility is a damaged sensor (you mentioned earlier it might have frozen?). That might have damaged it somehow, although I would not say it is likely. It could however, be a generically just bad sensor. the other possibility is somehow the electronics are damaged or defective. One other thing to look at is the interconnect wiring. There are four wires from the sensor (two for the sensor itself, and two for the thermistor). If the thermistor wiring is intermittent, it can do exactly what you say happens. This should be checked carefully. Another possibility is RFI. If there is a strong RFI surge, it can couple into the wiring and cause a spike lasting a second or two. Top of page We are technical managers on a vessel equipped with O2 analyzers Model 3290 for IG system. The vessel had problems with the remote indication of O2 content in different locations, when local panel indicates 2.8%, ECR ( Engine Control Room) shows 4.0%, CCR ( Cargo Control Room) shows 3.6% and recorder shows 5.6%. All three instruments are connected in series and show a current of 7.9 milliamps for this reading. There is no calibration method provided in manual. However the local control panel alarm for 5% and 8% O2 are working satisfactorily. Is there any way to calibrate all these indicators? The Procedure to calibrate this analyzer can be found on page 4-4, section 4-6 of the instruction manual. A copy of this manual can be downloaded from our website. Here is a link to the a manual section of our website: man_3290.pdf Also, greater matching between the displayed valued on the LED display and the analog output can be made by narrowing the range of the analyzer. The analyzer comes with two user programmable ranges. For instance on a range of 10 percent, the typical matching error on the analog output is typically 1 per cent of scale or less of scale, which is plus or minus 0.1 percent of O2. If intstead the range is set to say 2 percent, then the matching error is 0.02 per cent O2 plus or minus. Top of page How do you retrofit a 3290 from AC to DC power? Please refer to the following instructions: retrofit_3190_3290_AC_to_DC.pdf Top of page |
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