|
Posted by on May 16, 2007, 7:37 pm
wrote:
>A German-made heat and refrig. system outboard of a large 6-color sheet-fed
>press controls the temp of the h20/glycol coolant circulated in the press.
>
>The PLC that controls all this has gone brain-dead and is quoted at ~10K to
>replace. Owner simply wants cooling function (it's N. California, so no sub-0
>temps to worry about) and the simpler the better. A simple thermostat with
>remote sensor would do the job.
>
>Contactors for compressor & fans are standard 24vac or 120vac stuff. Refrig
>circuit has lo- and hi-press switches which can be incorporated to shut
>everything down if need be. Coolant (glycol) circuit has flow sensor switch
>so to protect pumps if level goes to zero. All this "safety" stuff can be
>incorporated with little trouble.
>Regarding temp control, I've looked in Grainger's catalog but everything I
>see is ambient air type thermostat or remote-bulb type sensor. Are there
>controllers that use electrical (ie, 2-wire) sensors that can be bolted in
>place of the existing ones in the coolant plumbing (the existing ones are of
>unknown origin and will probably be incompatible with any aftermarket
>controller)?
>
>Any suggestions helping me find a thermostatic controller for this
>application would be greatly appreciated.
http://www.coleparmer.com/catalog/product_index.asp?cls=6567
http://www.coleparmer.com/catalog/product_view.asp?sku=0215554
http://www.instrumart.com/Category.aspx?CategoryID=4765
http://www.instrumart.com/Product.aspx?ProductID=20357&CategoryID=4770
http://web5.automationdirect.com/adc/Overview/Catalog/Process_Controls/Temperature_-z-_Process_Controllers?source=google&keyword=temperature%20controller&type=search&gclid=CLWAgdS6k4wCFRxWgQodvl-M3g
And about a million others.
http://www.google.com/search?hl=en&q=temperature+controller
>
>Thanks,
>Sparky
--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/
Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap