hooking Sedex ELSD to chemstation

[lcrandall]

Hello,
I have an old Sedex model 85 ELSD that I'd look to hook into chemstation. Does anyone have any idea how to do this? It is an old detector and only has an RS232 line. Currently, the Chemstation is running 2 Agilent 1100s through a 10/100 port.
We don't normally use RS232 cables.

I know next to nothing about this type of thing, so keep it simple if you can.

Thanks!

[Blazer]

I just hooked up a Sedex 75 ELSD to our Agilent 1100 through Chemstation. Assuming the connections out from the Sedex 75 and Sedex 85 are the same, I can try and help you out with this. I didn't bother with the RS232 line from the ELSD. I went through an A/D converter (an Agilent model, I don't recall the number offhand) and used an ethernet hub. The connections went something like this:

ELSD: I connected the 1V output to the analog channel on the A/D box.

A/D Converter: I connected a remote start cable between the A/D box and the Agilent autosampler.

Ethernet Hub: I connected the A/D box to the ethernet hub and then - through a separate port - connected the UV detector from our 1100 HPLC to the hub.

I needed our IT department to help with some IP address issues to get Chemstation to recognize the A/D box. You may run into the same problem. Hopefully this helps you connect yours. If not, let me know or email me and I'll see what I can do to help. Alternatively, Agilent can probably help you; I've been told they sell OEM Sedere ELSDs.

[varossf]

The Agilent A/D converter is called 35900E. It is LAN based. Maybe a good idea to upgrade your ChemStation to B04.02 SP2 at the same time?

[HPLCCONSULT]

Hooking up the Sedex ELSD to an 1100-series HPLC system under ChemStation software control is easy. It would help if you could tell us which version of ChemStation you have as different versions have different compatibility with different modules and operating systems (*no need to waste money on upgrading software) and also if you currently have a 35900 (C or E) A/D Interface. The 'C' model only accepts HPIB control, not LAN and must be configured separately from the LAN modules (or you can hook everything up via HPIB and it will work just fine).

Sounds like you are using at least ChemStation Rev A.06.01 (supports LAN). Just connect the analog output of the SEDEX detector to the analog input of the 35900E A/D box. You will need a special analog signal cable to do this. One can be purchased from Agilent or you can find one offered by a third party seller on the Internet for much less money. A remote cable can also be hooked up as well. If you have a 35900E A/D box then you can purchase a LAN card for it and hook it up to your instrument network just like the HPLC. Be sure and configure them both in the system. The ELSD outputs an analog signal (mV's) which is read and converted to a digital signal by the A/D box. ChemStation is then configured to display and store the A/D signal.

[Ticoscen]

I've installed a couple hundred of these....
Since it's an older 85, here's the skinny on what you'll require
to get an analog signal into the 1100/1200:


[1] 35900E LAN (or GPIB) A/D box.
(I have two LAN versions if you need to buy one)
[2] HP 3 pin Molex Analog cable and terminal strip to connect them.
[3] Once hooked up, configure your Chemstation to recognize A/D box.
[4] Set signal sampling rate (HZ) to 5 or 10. (not 1)

If you want to autozero each injection, you'll need a
BCD contact closure board and cable.
External contact closures are not stock on Agilent HPLC's.
Don't use the "inject start" event. The ELSD needs a clean zero potential
contact closure. (NO TTL PLEASE)

Your HPLC stack is unlikely to have a BCD board on it already.
(Check the back of your pump or autosampler. Its a small rectangular
plate with two thumb screws)

Contact Closure Parts:
[1] 1100 external contacts BCD board : G1351A
[2] External Contacts Cable: G1103-61611

The external contacts board is installed into the back of the Autosampler
or pump module. It is automatically recognized when you power cycle the stack and reboot chemstation.

There are 4 programmable contact closure events.

Each events' output color code below:

white, brn= 1
grn,yell= 2
gry, pink= 3
blue, red= 4

Hope this helps!


Tim Reyburn
The ELSD servicing experts.

[Consumer Products Guy]

What Tim says above is correct. The 1050 modules have a built-in contact closure, on 1100 and newer you need that accessory to obtain stuff like autozero.