Chromatography Forum

If your curriculum ever enters the realm of food and flavors you could just have the column exit out to no detector and have a "sniff port" of sorts. There are expensive GCO detectors as well but for just a display or teaching situation you could tinker a bit and achieve something adequate.

I toured New Belgium Brewery and saw a sniff port. Thought it was awesome!

Hi

Gizmo's suggestion of a GC olefactometer modification is interesting and rather good.

I can supply some suggestions for adapting the GC for this

If there isn't an FID already in place it only requires drilling a small hole in the top right hand side of the oven under the lid and using a 0.53 mm id column with a thick film Innowax phase

And human detectors are quite cheap

Regards

Ralph

Hi

Gizmo's suggestion of a GC olefactometer modification is interesting and rather good.

I can supply some suggestions for adapting the GC for this

If there isn't an FID already in place it only requires drilling a small hole in the top right hand side of the oven under the lid and using a 0.53 mm id column with a thick film Innowax phase

And human detectors are quite cheap

Regards

Ralph

As of now there is a dead MS attached. Hopefully we can attach a FID if I can find one cheap. I have some old columns. I need to look at what we have. But I would love to here more.
Jarral

Hopefully we can attach a FID if I can find one cheap.
Jarral

I'll look at through my big box of 5890 parts by Monday, will let you know either here or though the E-mail you provided. I'd like to clear out all my 5890 stuff, need the space. And would be very reasonable.

I'll look at through my big box of 5890 parts by Monday, will let you know either here or though the E-mail you provided. I'd like to clear out all my 5890 stuff, need the space. And would be very reasonable.[/quote]

That would be great. And as Christmas is coming--a headspace analyzer also. Ha! thanks a heap.
Jarral

Hi

If you can get an FID to add then great.

You can follow up as a teaching aid using Gizmo's suggestion of an olefactometer by

1. Running a fragrance sample ( e.g. perfume or aftershave supplied by a student) with the flame lit to produce a chromatogram

2. Run the same sample again with the flame out and use the FID as a sniff port. Note the times of the eluted components detected by sniffing and back correlate to the chromatogram.

3. Use a wide bore thick film (1 micron) column to give peaks that are just a bit wider and allows for sniffing them successfully. If you use a narrow bore column then the peaks are too sharp and easily missed during sniffing.

Regards

Ralph

Hi

If you can get an FID to add then great.

You can follow up as a teaching aid using Gizmo's suggestion of an olefactometer by

1. Running a fragrance sample ( e.g. perfume or aftershave supplied by a student) with the flame lit to produce a chromatogram

2. Run the same sample again with the flame out and use the FID as a sniff port. Note the times of the eluted components detected by sniffing and back correlate to the chromatogram.

3. Use a wide bore thick film (1 micron) column to give peaks that are just a bit wider and allows for sniffing them successfully. If you use a narrow bore column then the peaks are too sharp and easily missed during sniffing.

Regards

Ralph

And without a FID you would just have column come out to sniff?

1. D'oh !!! Box of parts must be in my attic !!!

2. We had an olfactory port for a time, yes time consuming to use. We used a splitter and one could see the peak eluting on the chart. Best if one adds some moisture to the effluent, contact Gerstel for information.

Hi

And without a FID you would just have column come out to sniff?

Yes, if it just protrudes by a just a few mm the tip will be kept warm and reduce peak condensation problems.

There is a technique for sniffing the outlet that I developed for this design but we can go into that in more detail if you get that far, along with where to drill safely

I have built a few olefactometers and used commercial ones over many years with splitting to FID or MS as KM rightly suggests

Although it makes complete sense in theory, in my experience a humidifier adds complexity and doesn't actually offer much of a benefit - I have tried it with and without a humidifier and it didn't make any difference

For your student demonstration purposes I would say just keep it simple and just give it a try

Regards

Ralph

Hopefully we can attach a FID if I can find one cheap.
Jarral

I'll look at through my big box of 5890 parts by Monday, will let you know either here or though the E-mail you provided. I'd like to clear out all my 5890 stuff, need the space. And parts would be very reasonable.

OK, here's what I found in the attic. Make offer if interested. Christmas sale, I need the space.
82335 HPIB board
82341 HPIB board
82350 HPIB board
19232-60020 TCD board
19231-60010 FID board (two)
19257-80040 Board (two)
18594-B0170 Controller box board for ALS
5061-3302 Board CIB board (five)
K9260EU-01 Board
05890-60945 Oven flapper motor 5890 (new)

18597-60255 ALS tower mount (rare type that fits both “A” and “B” 7673 towers)
03380-60070 Print head for 1084, 5830, 5840 (new)
Oven fan blade 5890
Oven fan motor 5890
FID housing 5890
0-30 psi pressure gauge
FID/TCD gas valves/ignitor switch

19251-60560 Capillary split/splitless injection solenoid (new)
19257-60020
19246-60530 Controller
Oven heater and support 5890
05890-80300 Main board 5890
Oven flapper with motor 5890
19300-80710 Oven heater wire (new, two)
05890-60050 Board
Pressure controller 5890
Front keyboard and attached circuit board 5890
19362-60570 Gas controller (new)

Ping me sometime when you have a moment. I am about to move into your area and would be more than happy to discuss 5890's.

AICMM at flash dot net.

Best regards,

AICMM

Hi AICMM

At whom are you directing your post? jryter - the original poster?



Kind regards

Ralph

Yes, the post was directed to JRyter.

I am now up in CO.

Best regards,

AICMM