Instrument purge

Instrument Purging for Reduction of Hazardous Area Classification... 

Confirm that the restriction orifices used for instrument purges are in proper working condition and that the orifices are not missing. 

Analyzer safety There are several potential safety hazards, and the source is one - providing localized temperatures in the range of 1100-1500 K. The laser and its power supply, which is a potential high voltage spark hazard, are other examples. Methods for thermal isolation and instrument purging can address the source issues. The discharging of any charge within the capacitance circuitry of the laser power supply addresses the spark hazard issue. 

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. 

Sample volume 60 mL Trap see extraction instrument Purge gas He Purge flow 50 mL/min Purge temp. 45°C Purge time 20 min Desorp. temp. 275°C Desorp. time 15 min Cryofocusing -150°C Cry of. Heated at 800°C until 260°C (kept 6 min)... 

Pump each mobile phase component at 5 mL/min for 5 min with the instrument purge valve open to flush lines and prime instrument (7). If the instrument is not sufficiently primed, retention times may be outside their monitoring window or chromatographic peaks may be absent. 

---