Experimental Physics and
Industrial Control System

Matthew Rippa <[email protected]> · Thu, 16 Aug 2001 12:39:22 -1000

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]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System