Short Paththermal Desorption Conditioning System

US $3600

East Meadow, New York, United States
May 24th

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The Desorption Tube Conditioning System is used for the flow conditioning of both empty and packed Silco Coated SS desorption tubes as well as for the flow conditioning of the desorption tube needles. A high purity gas such as helium or nitrogen is used to purge the packed desorption tubes and needles while they are baked out at elevated temperatures. By proper conditioning of the desorption tubes with adsorbents and needles, no foreign contaminants will interfere with or contribute to the composition of the samples being analyzed. Sample "memory effects" due to cross contamination will be eliminated. The Desorption Tube Conditioning System consists of six adjustable flow rotameters and a heater block with six ports (I.D. 0.40 inch x 4.0 inch deep) for cleaning of six desorption tubes or needles simultaneously at temperatures up to 350 degrees C. A precision programmable temperature controller provides the heater circuit to heat the heater block and permit the programming of the temperature at which the tubes are to be conditioned. Temperature programs of up to six steps with various ramp cycles and hold times can be programmed into the controller for the unattended conditioning of the desorption tubes. Programs are stored in the system's memory. Accuracy of the programming is +/-0.1% of the scale reading. An L.E.D. digital readout displays the set temperature and actual temperature of the system, and the bubble meters indicate the flow through each desorption tube. Three on/off switches are present on the front panel including a main power switch, a heater switch and a gas switch. Each of the six adjustable flow bubble rotameters has a flow range between 0 and 50 mL/min, one for each of the tubes or needles to be conditioned. Each of the flows through the tubes can be independently controlled via a microneedle valve and the flow turned off to that port when not needed. A single electrically operated solenoid valve (Gas Valve) turns off or on the gas to all the ports via the Gas Switch on the front panel. On the top of the Conditioning System six quick disconnects connect to 1/8" flexible nylon tubing to provide gas flow through the desorption tubes and needles during conditioning. When the quick disconnect is removed, the gas flow is automatically closed to that port. By providing gas flow from a carrier gas such as high purity helium or nitrogen through the desorption tubes and needles while conditioning, it can be assured that no oxygen enters the Silco coated desorption tube which could destroy the adsorbent material. Impurities from the inside of the desorption tubes and needles are flushed through. A single 1/8" fitting on the back of the Conditioning System is provided for the attachment of the carrier gas from the source.