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FID Sensitivity: 6890 vs. 7890
Posted: Thu Oct 25, 2012 6:00 pm
by akthmps
Hello --
I am curious to know whether there is a sensitivity difference between a 7890-FID and a 6890-FID? Assuming both detectors were in optimized states. Is there even a difference in the hardware - is a 6890 FID compatible with a 7890 chassis and electronics?
Thanks for sharing your experience.
Re: FID Sensitivity: 6890 vs. 7890
Posted: Thu Oct 25, 2012 9:30 pm
by GasMan
Although the basic hardware of the detectors is the same for 6890 and 7890, the electronics and gas control modules are completely different.
Gasman
Re: FID Sensitivity: 6890 vs. 7890
Posted: Thu Oct 25, 2012 9:51 pm
by dblux_
Hello --
I am curious to know whether there is a sensitivity difference between a 7890-FID and a 6890-FID? Assuming both detectors were in optimized states. Is there even a difference in the hardware - is a 6890 FID compatible with a 7890 chassis and electronics?
Thanks for sharing your experience.
According to Agilent 5889-3290EN and 5989-6317EN (6890 and 7890 data sheets respectively) FID sensitivities are expressed as minimum detectable level (for tridecane). For both detectors values are the same < 1.8 pg C/s.
Can't compare practical sensitivities.
Re: FID Sensitivity: 6890 vs. 7890
Posted: Fri Oct 26, 2012 3:45 pm
by Yama001
I run both of them for petroleum hydrocarbon stuff - pretty much equivalent response - a standard from the 7890 will pass a cailbration generated on the 6890.
Re: FID Sensitivity: 6890 vs. 7890
Posted: Fri Oct 26, 2012 3:58 pm
by akthmps
Thank you all for the responses. Just as I figured, there really is no advantage to buying a refurbished 7890 vs. a refurbished 6890 (at least in terms of FID sensitivity).