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APPLICATIONThe Model 6900 is designed for the measurement of gas mixtures produced in the industrial gas industry. The *yzer is designed to quickly (3 - 5 minutes) *yze a gas cylinder, without the use of calibration standards, wet chemicals, or special knowledge of gas *ysis instrumentation. The *yzer is designed so that it may be used directly in the cylinder-filling environment. SPECIFICATIONSRANG*
ACCURACY Valid over 50º F to 90º F(10ºC to 32ºC) ambient temperature conditions. MINIMUM/MAXIMUM OPERATING TEMP. 40ºFto 100ºF (4ºC to 38ºC) R*OLUTION 0.1% R*PONSE TIME 95% in 45 sec. for t*ical gas mixtures UTILITI* REQUIRED Reference Gas: Commercial grade argon or nitrogen (depending upon the base gas range used) is required to flow continuously at 0.5 SCFH during *ysis. FREQUENCY OF CALIBRATION Calibration is recommended once a year when used under spot-checking conditions; if run continuously will depend on conditions and range. WARM UP TIME 8 minutes under room temperature conditions PHYSICAL SPECIFICATIONS Size: 9". high, 11". wide, 14". deep (23 cm X 28 cm X 35.5 cm), ALTITUDE Sea level to 2000 ft. (Altitude above 2000 ft. will cause some inaccuracy; consult the factory) ANALYZER OUTPUTS Current: 4-20 mA, proportional to gas *ysis range selected (available on all ranges). The 4-20 mA resolution equals display resolution of 0.1% gas *ysis. |
PRINCIPL* OF OPERATIONEach gas has the ability to conduct heat at a specific rate. This is known as the thermal conductivity of the gas. This property is utilized in the Thermco thermal conductivity detector. Heated metal filaments are exposed to the zero and sample gases. The amount of heat carried away by the gas changes the rate of cooling of the wire filament and therefore, its temperature change. This temperature change causes a resistance change. Since the filaments are arranged in a Wheatstone bridge, the resistance change can be converted to an electrical current that is read out on a meter. CUSTOM RANGEThe user may encounter a gas mixture pair other than the nine standard ranges built into the *yzer. In this case, the user may perform an *ysis by inputting his own calibration data into the *yzer. This can be accomplished by utilizing the push buttons on the front meter. Guidance is available from the factory concerning the thermal conductivity response of a wide variety of gas pairs. 3 GAS MIXTUR*Although the Model 6900 is not normally intended to measure a 3-part mixture, mixtures of Ar / CO2/ O2may be approximately measured if the user knows the oxygen level in the mix. Contact Thermco for details. SERVICEThermco has been providing service for their *yzers since 1951. The Thermco repair department can normally complete repairs in two weeks. *TICEThe Model 6900 is not intended to measure oxygen/nitrogen mixtures for breathing air, oxygen purity, or other medical applications. ACC*SORI* SUPPLIEDAlong with the *yzer are supplied two 10 ft. lengths of tubing to run from the ports on the Model 6900 to cylinder regulators. ORDERING INFORMATIONOrders may be placed through many local industrial gas suppliers. Orders may also be placed directly with the Thermco factory. |