Greg:
Do you use the buffer refill option? We routinely run HD on
our 251 and do not see any drop in ref gas pressure because of the
external H2 reservoir we keep attached to our machine.
Howie Spero
>This is my first time doing HD analysis on out MAT251, and I have a
>question regarding the bleed rate for H2 on this machine. By bleed
>rate I mean how much does the signal voltage drop during an
>analysis. I am seeing a voltage drop of almost 0.2 volt during the
>course of run. This means that if I start with a 4 volt signal on
>the standard side, I can only do 20 runs before I run out of
>standard gas. This doesn't seem right to me and this machine has
>been used before to run HD analysis without running out of standard
>gas after analyzing 32 samples but the person who did the analyses
>does not remeber what the bleed rate was. Does anyone know or could
>mesure the bleed rate for a 251? If my rate is to high what could
>the cause?
>
>Thanks,
>Greg
>
>=======================================
>Gregory A. Wandless
>Chemist
>US Geological Survey
>MS954
>Reston, VA 20192
>
>Email:[log in to unmask]
>Phone: (703) 648-6189
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* Prof. Howard J. Spero * e-mail:
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