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3000TA-XL - Trace Oxygen Analyzer
Who is the manufacturer of the passive (no electrical power required) flow controller used in the 3000TAXL? (Must be specified as an option.) VICI Metronics Inc. Condyne Div., FC30AS4K with stainless steel fittings 6-0016-0 Top of page Please recommend a compatible fitting to connect the instrument to 1/4" copper tubing. Swagelok sells VCR quarter inch compression fitting adapters. The ordering number for this 1/4" VCR to 1/4" tube connector is SS-4-WVCR-6-400. You will also need gasket P/N NI-4-VCR-2-GR-VS. Top of page Does the 3000T have internal alarm relays that are able to power up a 24VDC external indicating light? For example, if the concentration goes above certain level, the alarm relays will power up this light. The alarm relays in the unit are dry contacts. They have no voltage themselves to drive a light. Customer would need to supply a light and a voltage source and connect to the alarm relay. Top of page How does calibration gas preparation tolerance error affect the accuracy of the analyzer when in service? To calculate this we first can model the output of the ufuel sensor as linear: I.e. the current the sensor produces (expressed in Ameres, A), if a linear function of the O2 concentration: mathematically: I = O2 * m, where m is the slope coefficient with the units of (A/ppm O2) (more rigorously, the sensor also has a small offset which is neglected in this discussion) Then, we can develop in a closed form equation the relationship between measurement inaccuracy and error in calibration cylinder analysis: First we can state that: O2 calculated = (slope determined at the time of calibration) * I O2 actual: (actual slope) * I Slope calculated at the time of calibration = (calibration gas cylinder analysis value) / Calibration Current Actual Slope = (real gas concentration) / cal concentration Therefore the measurement error = O2 calculated - O2 actual = I * ((calibration gas cylinder value) / calibration current) - (actual calibration cylinder value / calibration current) So as one can see from this equation, as the measured current gets smaller the error approaches zero. If one is interested plugged real numbers into the equation, we can say that the normal sensor slope is approximately 3nA/ppm O2. So if we had a 8ppm cylinder analyzed to 8.2ppm, the error at 1ppm would be: =3 * ((8.2)/24 - (8/24)) = .025ppm The sketch below shows the graphical relationship: 
Top of page How do you determine the need to replace the micro-fuel cell in Teledyne trace oxygen analyzers? Please refer to this document: MFC_End_of_Life_Determination.doc Top of page |
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