lifetime of filaments

[Anica]

I would like to know an average lifetime of filaments used in GC/MS and what factors it depends on (only the solvent cut time?). We have Shimadzu 2010 QP. First filament lasted only 255 h of 1500 h supposed. Any suggestions as to why the filament might have blown so suddenly would be appreciated. Anica

[nolteboy]

Not being familiar with Shimadzu MSD's (only HP/Agilent), I'd hafta say that 1000 to 1500 hours is about right in my experience. If this is indeed your first filament, it might have just been a statistical fluke (i.e. that particular filament might have been a "lemon"). You have checked the filament voltage setting to make sure that it's not in excess of what would be reasonable (~70 electron volts or thereabouts is typical for most applications)? Your system is tight and leak-free? (besides contributing to high baselines and poor sensitivity, too much air in system could shorten filament lifetime).

[vperica]

Very important factor for life time filament is level of water and air.Check
gas purifier for moisture and oxigene.

Perica

[james little]

Scientific Instrument Services rebuilds filaments for a good price and does a good job. Often better than the original from the manufacturer.