RE: Cost effective solution for monitoring a large number of temperatures

["Mark Rivers" <rivers@cars.uchicago.edu>]

Hi Josh,

I don't have hard numbers for the 2700.  On the older 2000 with a 10
channel card we can get a little faster than 1Hz if all 10 channels are
active I think (=10 readings per second). They are mechanical switches
for selecting the active input.

Mark
 

> -----Original Message-----
> From: Josh Stein [mailto:stein@aps.anl.gov] 
> Sent: Thursday, February 02, 2006 2:16 PM
> To: Mark Rivers
> Cc: TechTalk EPICS
> Subject: Re: Cost effective solution for monitoring a large 
> number of temperatures
> 
> Hey Mark,
> 
>   The Keithly 2700 looks like the ticket. The other solutions 
> may be a 
> bit more 'techy' but I'm aiming for COTS as much as possible. It also 
> appears that Keithly is offering an 40 channel module with 
> cold junction 
> compensation now - I'll look into that one. What rates are 
> you able to 
> scan this beast at? I imagine it is hardware bound.
> 
> Thanks,
> <josh>
> 
> Mark Rivers wrote:
> 
> >Hi Josh,
> > 
> >In synApps we support the Keithley 2700.  Each of those 
> units takes 2 cards for a total of 40 thermocouples.  It 
> costs about $2K, so $50 per thermocouple.  It can be extended 
> with external multiplexors, but EPICS support would need to 
> be written for those.
> > 
> >Mark
> > 
> >
> >________________________________
> >
> >From: Josh Stein [mailto:stein@aps.anl.gov]
> >Sent: Thu 1/19/2006 9:03 AM
> >To: TechTalk EPICS
> >Subject: Cost effective solution for monitoring a large 
> number of temperatures
> >
> >
> >
> >Controls experts,
> >
> >  In the undulator hall of the LCLS we expect to monitor (what I
> >consider) a large number of temperature points (on the order of about
> >300). My past experience with thermocouples has been local 
> installations
> >of between one and eight data points. It would be easy to just scale
> >that solution by a factor of 40, but I have to believe there are more
> >cost effective solutions.
> >
> >  Can anyone with experience in this regard please point me 
> in the right
> >direction? I'm looking for hardware that is, of course, 
> EPICS compliant.
> >
> >Thanks,
> ><josh>
> >
> >
> >
> >  
> >
> 
>