Model 3110 - Teledyne Analytical Instruments

Portable Trace Oxygen AnalyzerIntroduction• Quick Disconnect Fittings: Dual self-sealing quick disconnectfittings are installed for making easysample connections.1.3 Method of AnalysisThe sample oxygen is measured by a unique electrochemicaltransducer which functions as a fuel cell; in this instance, the fuel isoxygen. Oxygen diffusing into the cell reacts chemically to produce anelectrical current that is proportional to the oxygen concentration in thegas phase immediately adjacent to the transducer’s sensing surface. Thelinear, but minute signal produced by the transducer from oxygen isamplified by a two-stage amplifier. The O2 sensor output signal isdigitized and fed to the microprocessor. Additional signal conditioningand temperature compensation are handled electronically andappropriate signals are directed to the display and output ports.1.4 Micro-Fuel CellThe micro-fuel cell (U.S. Pat. Nos. 3,767,552 and 3,668,101) is asealed electrochemical transducer with no electrolyte to change orelectrodes to clean. When the cell reaches the end of its useful life, it isremoved, properly disposed of, and replaced with a new cell. The life ofthe cell is warranted by TAI (see below).The cell is specific for oxygen and is not sensitive to flow rate orreducing agents such as hydrocarbons, carbon monoxide, sulfur dioxide,etc. In the absence of oxygen, no current is produced; thus, no zeroing isrequired.1.4.1 Cell WarrantyThe Class B2-C, A2C, B2C-XL and Insta Trace micro-fuel cellscan be used in the Model 3110 and are warranted for six (6) monthsfrom the date of shipment.With regard to spare cells, service time starts when the cell isremoved from its shipping package. You should stock only one sparecell per instrument at a time.If a cell was working satisfactorily but ceases to function before thewarranty period expires, the sensor will be replaced at no cost.Teledyne Analytical Instruments 13