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- Posts: 86
- Joined: Sat Nov 28, 2015 5:46 pm
- HP 5890
- HP 5890 Series II
- HP 5890 E
- HP 5890 Plus
I know some have EPC control, etc. Just want to know if there are any major issues I should be aware of when deciding to purchase.
Thanks
Discussions about GC and other "gas phase" separation techniques.
I have a series II. It has an EPC but do you know if I would need restrictor frits to control flow in the 0.2-1.0 mL/min range. It seems to me that while it seems to control He from 0.2-1 ml/min it cannot deal well with H2 at anything below 0.4mL/min. I wonder if I need a different frit in the mass flow controller or do these limitations sound about right? I'm running a 20m x 0.18mm x 1um DB-VRX column. into a 5972 MS.James_Ball wrote:
I know originally the 5890 came with mechanical pneumatics, the Series II I believe had a mixture of both, the first EPC (electronic pressure control) units were introduced on the Series II. The E and Plus I think came after those and depending on how they were ordered could have any combination of flow controls.
On the original I remember the flow controller for detectors used needle valves, but on the Series II and up, they came with restrictor frits and used pressure to control the flow on the manual pneumatics. I think it would be the E and Plus versions before they introduced EPC for detectors.
Of course everyone upgraded them as they went along so you never know what combination they could have. Some of the changes also included how the injector towers mounted and the style of the top lid and different main board configurations as they could make the boards smaller in later years along with better wiring harness too. Functionally though they are all pretty much the same.
LALman wrote:I have a series II. It has an EPC but do you know if I would need restrictor frits to control flow in the 0.2-1.0 mL/min range. It seems to me that while it seems to control He from 0.2-1 ml/min it cannot deal well with H2 at anything below 0.4mL/min. I wonder if I need a different frit in the mass flow controller or do these limitations sound about right? I'm running a 20m x 0.18mm x 1um DB-VRX column. into a 5972 MS.James_Ball wrote:
I know originally the 5890 came with mechanical pneumatics, the Series II I believe had a mixture of both, the first EPC (electronic pressure control) units were introduced on the Series II. The E and Plus I think came after those and depending on how they were ordered could have any combination of flow controls.
On the original I remember the flow controller for detectors used needle valves, but on the Series II and up, they came with restrictor frits and used pressure to control the flow on the manual pneumatics. I think it would be the E and Plus versions before they introduced EPC for detectors.
Of course everyone upgraded them as they went along so you never know what combination they could have. Some of the changes also included how the injector towers mounted and the style of the top lid and different main board configurations as they could make the boards smaller in later years along with better wiring harness too. Functionally though they are all pretty much the same.
James_Ball wrote:
I believe diffusion pumps can pump away hydrogen better than the turbo pumps can.
On the ion gauge you will see a higher pressure than you think it should be, but that is because the response to hydrogen is different than the response of helium, and actually the ion gauges are calibrated to nitrogen so both will give only an estimated ultimate pressure. I once found a table showing the difference somewhere and hydrogen is almost a factor of 10 difference on the gauge than helium at the same actual pressure.
lespaul wrote:
We're looking to purchase a HP5890 GC and was wondering if anyone know what were the major differences between the following versions:
- HP 5890
- HP 5890 Series II
- HP 5890 E
- HP 5890 Plus
Consumer Products Guy wrote:lespaul wrote:
We're looking to purchase a HP5890 GC and was wondering if anyone know what were the major differences between the following versions:
- HP 5890
- HP 5890 Series II
- HP 5890 E
- HP 5890 Plus
Ha !!! Our first one was a 5890A; manual pressure controls, actually was purchased with a 7671 autosampler as 7673 autosamplers were not going to be available for a half-year, and my boss feared our budget would be "appropriated" if we waited.
I think you need to make sure that one has EPC and ability to be hooked up to a computer/Chemstation, if that's what you're needing.
These were great GCs, don't know about parts availability these days.
lespaul wrote:
We're looking to purchase a HP5890 GC and was wondering if anyone know what were the major differences between the following versions:
- HP 5890
- HP 5890 Series II
- HP 5890 E
- HP 5890 Plus
I know some have EPC control, etc. Just want to know if there are any major issues I should be aware of when deciding to purchase.
Thanks
Alan Liefting wrote:
I have a 5890A. I can't find info specifically for the 5890A. Can I use the 5890 manuals?
Consumer Products Guy wrote:
That said, I think it was difficult/expensive/impossible to update a 5890A to be computerized. However, much of the 5890A was similar to the later, better models.
Alan Liefting wrote:Consumer Products Guy wrote:
That said, I think it was difficult/expensive/impossible to update a 5890A to be computerized. However, much of the 5890A was similar to the later, better models.
Thanks for that. I guess I should just compare the old and new manuals.
I fired (literally) the machine up this morning. Initially gave a RAM error, possibly flat backup battery, then after powering it on later it booted and started the self tests. Within a short time smoke billowed out of it but was still operating. Turned out to the RIFA brand capacitors on the mains input. It is a common problem in all sorts of mains powered items and it is easily fixed.
Cheers
Alan
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