At 09:54 AM 8/21/2007, you wrote:
>Be aware that they tend to fail shorted - so you'll want a thermal 
>safety cutout for the 120/240.
>As it is a resistive load you won't get too much EMI but I'd still 
>go for a zero crossing device just to be safe.
>
> >>> geekything@gmail.com 21 Aug 07 10:22:54 >>>
>Hi all,
>
>I have a project where I'd like to switch a small immersion heating element
>(in the prototype it'll be from a "single cup kettle") on and off with a
>digital PID and an SSR.
>
>To be frank, I really don't have that much experience with SSRs or switching
>AC loads in general. Any pointers other than "don't fully submerse the
>element"? ;)

Put the SSR in series with the element (rather than parallel)? ;-)


>Oh, for reference...the element is marked 125Watts @ 120VAC, 500Watts @
>240VAC.
>
>TIA.
>
>-marc

Switching the AC load isn't really much of an issue when you're using a
canned SSR solution. You won't likely even need a heatsink at an amp or
two. Watch you don't electrocute yourself, of course, especially with
water or whatever you're heating present.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist