- Agilent Headspace G1888 Manual
Hi, guys. We have an Agilent headspace autosampler G1888 hooked up with an Agilent 7890 GC.
Recently we have been experiencing a weird issue with the autosampler's sample probe lifter. Now every time when we ran the samples, the vials were taken into the carousel fine, but after sampling probe was injected into the vial cap, the sampling probe couldn't completely retract back to its original position and still connect with the vial, blocking the rotation of the carousel, sample vials stuck inside and the sequence stopped. I tried to reset the autosampler, but the sampling probe still stick out.
Have some had the same issue before and can give some advise?
Thanks!
Here we transferred a blood alcohol analysis method from Agilent’s G1888A Headspace Sampler to the 7697A Headspace Sampler. Agilent’s 7697A Headspace Sampler also gives you an added benefit: shorter cycle times for blood alcohols without sacrificing resolution. The sampler’s proven architecture, together with Agilent’s exclusive sampling. May 22, 2015 This feature is not available right now. Please try again later. HT2000H: Headspace Autosampler. The user places the sample vials in the tray. The vials are picked up by the autosampler gripper and placed in the oven where they are simultaneously heated and shaken in order to facilitate the state change and to reach equilibrium. For routine analyses, the headspace sampler features a one-touch.
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Agilent Headspace G1888 Manual
I set up to test some residual solvents with DMSO as my diluent (validated method) and am getting a peak that is overlapping my methanol peak making my run impossible. Even when injecting a number of blanks in a row it's still there. I decided to take my column off and install a retention gap (no stationary phase) column that stuff will just fly through. A did a bunch of injections and bam, it's there. I had a problem like this years ago on a different system (lots of analysts use these GC's for many different tests, though most are DMSO or DMA based) and it turned out to be the sample loop. The way I tested it was by watching the output with the sample valve closed (sample loop is bypassed) and then opening the sample valve on the headspace which puts the loop in-line. I would then see a rise in output which meant contamination. I called Agilent and they had me replace the loop and it fixed it. This time I replaced the sample loop and nothing changed at all.
I'm thinking the only thing it could be is the 6-port valve is contaminated because that's the only thing that's a variable when opening the sample valve besides the sample loop. When I did call Agilent last time I asked if steam cleaning could fix the contamination and they said that rarely works. I tried calling them today but they were closed. I did look the 6-port valve up and it's over $1000 so I don't want to waste the money if there's something else I could try first.
Oh, one more thing. We typically run around 90 oven, 110 loop and 115 transfer line. I cranked all three to 250 and I was getting a lot more response then I was previously. Another test I did was watched the output for a while, which was around 15, and then opened the sample valve. It would jump up to around 250-300 and then settle back down to around 20, constantly. It would sit at 20 forever until I closed the sample valve and then it would drop back down to 15, showing that flushing through the 6-port valve and sample loop was causing static contamination to be sent through the system.
Thanks in advance for any help!