Hi Harvey,
We have almost 250 (4-wire)RTD's connected to 3 Keithley 7002 switch boxes
(10, 10 channel cards ) with a Keithley 2010 DMM taking measurments. The
crates are about $3800 each and the DMM was about $2400. That puts you in
the ~$42 per sensor range for 7 crates and 1 DMM. We also added an HP
LAN/GPIB gateway for $400 I think.
EPICS records are assigned to each sensor and we scan the entire loop in
under 3 minutes. You could decrease this time by increasing the number of
DMM's. That puts you up to the ~$62 per sensor range for a DMM per crate.
Hope this helps.
Regards,
Matt
On Wednesday 15 August 2001 07:54, Rarback, Harvey wrote:
> Folks,
>
> We need to monitor about 700 thermocouples for the SPEAR3 upgrade. There
> will be about 40 TCs on 18 girders distributed around the 230m ring
> circumference. The present plan is to monitor the temperatures at a few
> second intervals. We have a couple of quotes from PLC vendors, but they
> are fairly expensive.
>
> Does anyone have a suggestion for hardware and software to accomplish our
> task? Of course the aim is to get the temperatures into an IOC.
>
> --Harvey
> ----
> Harvey Rarback phone: (650)926-3963
> Stanford Linear Accelerator Center fax: (650)926-4100
> 2575 Sand Hill Road home phone: (650)560-9111
> Menlo Park, CA 94025
> [email protected]
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