[RASMB] Xl-I wavelength check question

[Luitgard Nagel-Steger]

Hi,

I would be careful with ethanol. As we tried the cleaning in an 
ultrasound water bath last time, the foil came off in EtOH.
Luckily for us it was at the suggestion of the technical engineer, so he 
could directly replace the slit assembly by a new one.

Luitgard


Titus M. Franzmann wrote:
> HI, 
> I typically use a ultrasound water bath with the slit assembly in ddH2O or
> EtOH for 1-5 min. Then air dry. Usually does the job for me.
> Best
> Titus
>
> -----Ursprüngliche Nachricht-----
> Von: rasmb-bounces at server1.bbri.org [mailto:rasmb-bounces at server1.bbri.org]
> Im Auftrag von John Philo
> Gesendet: Donnerstag, 18. Februar 2010 13:54
> An: 'Virgil Schirf'; rasmb at server1.bbri.org
> Betreff: Re: [RASMB] Xl-I wavelength check question
>
> Virgil, you are quite right that the slit assembly can cause low intensity
> issues, but for the record I believe the physical width of the slit is ~20
> microns, not 2 nm! The 2 nm figure one sees in the Beckman manuals refers to
> the bandwidth of the light that results after it passes through the slit (as
> limited by the long dimension of the slit). 
>
> John
>
> -----Original Message-----
> From: rasmb-bounces at rasmb.bbri.org [mailto:rasmb-bounces at rasmb.bbri.org] On
> Behalf Of Virgil Schirf
> Sent: Thursday, February 18, 2010 9:30 AM
> To: rasmb at server1.bbri.org
> Subject: Re: [RASMB] Xl-I wavelength check question
>
> Greetings,
>
> After the lamp,  low intensity outputs can be also attributed to dirty slit
> assemblies. The slit is 2 nm wide, so it doesn't take much oil or dirt to
> partially block this opening. Unfortunately, it is not generally a piece
> that can be maintained by a user. The foil the slit is cut into is glued
> onto the brass assembly and comes off easily with too much air pressure or
> other physical means. There are also two lenses in the assembly with one
> flat surface and one convex surface. They can be cleaned and reassembled so
> that the two convex surfaces meet to form an hourglass configuration. 
>
> That being said, I would suggest that you have your service engineer clean
> or replace the slit if you have a clean lamp and low intensities. 
> With the slit out, you can also check the surface of the underlying PMT to
> see if oil and dirt have built up on it.
>
> Best regards,
>
> Virgil
>
> Leech, AP wrote:
>   
>> Hi everybody,
>>
>> Some systems, like our XL/I, have an extra window in the monochromator 
>> mounting socket, which helps save on lamp cleaning as it keeps the oil 
>> from "cracking" on the lamp surface. Our lamp intensity is quite low 
>> (~10000), whether this is affected by the extra window I don't know, 
>> but it doesn't go down much with use.
>>
>> It is worth checking this window from time to time - if your AUC has 
>> one you should have a special tool for extracting it (like a 
>> screwdriver with a round magnetic end).
>>
>> Best to all,
>>
>> Andrew
>>
>>
>> Borries Demeler wrote:
>>
>>     
>>> Hi Mark,
>>> I should mention that we have to clean our lamps quite regularly, 
>>> depending on use perhaps every 2-3 weeks. The procedure is simple 
>>> enough, it would be worthwhile to have the service person teach you 
>>> how to do it yourself. Sometimes other optical components also 
>>> require cleaning, but the lamp is usually the biggest culprit. Lamps 
>>> do vary in intensity at 230 nm, most I have come across range between 
>>> 12-30 kcounts when cleaned. The UV intensity is lost first, I guess 
>>> dirt absorbs in the UV stronger than in the vis.
>>>
>>> Regards, -Borries
>>>
>>> _______________________________________________
>>> RASMB mailing list
>>> RASMB at rasmb.bbri.org
>>> http://rasmb.bbri.org/cgi-bin/mailman/listinfo/rasmb
>>>       
>
>   


-------------- next part --------------
A non-text attachment was scrubbed...
Name: nagelst.vcf
Type: text/x-vcard
Size: 350 bytes
Desc: not available
URL: <http://list.rasmb.org/pipermail/rasmb-rasmb.org/attachments/20100219/8d957bba/attachment-0007.vcf>