Inerts instrument purge

Run the poly(vinyl chloride) in the instrument using an inert gas purge (usually N2.)... 

Instrument Purge - On occasion the process requires that some instrument be purged with either air or inert gas. This unit includes 50 ft. of 1/2-in. carbon steel line and one valve. 

Instrumentation Purging. A hazard classification can be reduced by continuous addition of air or inert gas to a general-purpose enclosure. For example, totally enclosed control panels which contain electronic devices that are not rated for Division I can be used in that service if purged according to ISA S12.4. A purged control panel cannot be opened for adjustments or maintenance if explosive vapors are present or if the components are powered. Electrical power can not be reinstated imtil the panel has been closed and purged of all explosive vapors. 

Hexachloroethane can be detected in tissues at levels as low as 0.001 pg/g (Nolan and Karbowski 1978) and recoveries range from 50 to 130%. Prior to analysis, hexachloroethane must be separated from the biological sample matrix and prepared for introduction into the analytical instrument. Separation may be effected by purging with an inert gas (helium), and trapping on an adsorbent cartridge (Tenax GC ), followed by... 

Elemental composition Ni 34.38%, C 28.13%, O 37.48%. The compound may be identified and measured quantitatively by GC/MS. An appropriately diluted solution in benzene, acetone, or a suitable organic solvent may be analyzed. Alternatively, nickel tetracarbonyl may be decomposed thermally at 200°C, the liberated carbon monoxide purged with an inert gas, and transported onto the cryogenically cooled injector port of a GC followed by analysis with GC-TCD on a temperature-programmed column. Nickel may be analyzed by various instrumental techniques following digestion of the compound with nitric acid and diluting appropriately (See Nickel). 

When instrument connections are purged by an inert gas, adequate venting must be provided at the overhead condenser to prevent gas blanketing. In one incident (239), condensation was impaired after a nitrogen-purged instrument was added to the column. Gas-purged instrument connections should be avoided if the gas can be troublesome in the condenser or in downstream equipment. 

Refineiy Debutanizer The ability to condense the overiiead product was lost because of vapor blanketing in the condenser shell. Venting solved the problem. A newly installed, nitrogen-purged instrument caused the problem. Ensure adequate venting when inerts are likely to be present... 

A block diagram of a TL instrument, which is composed of a light-proof box with a heating block to which the sample and a thermocouple are attached, is presented in Figure 6.20. An aluminium window allows the sample to be irradiated before heating. The chamber can be evacuated or purged with an inert gas. The TL sensor is a high-sensitivity photomultiplier with a dark... 

---