Hi All,
I am wanting to build a small 110vac temp controller for sous vide cooking. Found a bunch of PID controllers for around 20-bucks and lots of how-to-build instructions.
RNR, SNR and SSR?
I am guessing SSR is Solid Sate Relay, but what are SNR and RNR?
Search as I might I cannot find an explanation for those two. I see a zillion ads offering either type but have no idea which one I want.
Thanks
Dave
Hamilton, I don't get it.
How do those links answer my question. Building the Sous Vide is the simple part and I don't need instructions for that.
Lead, follow or get out of the way.
Dave
Since the PID controller will have a pulsed output for a SSR that is the one to use. The power will be going on and off a lot so you will not want to hear a relay clicking away whislt cooking, not to mention wearing out the relay contacts etc.
Of all the links, did any one of them use anything other than a SSR ?
Sorry to waste your time, I won't do it again.
As I read one discussion, an RNR model has a built-in relay which is capable of switching a specified class of loads. An SNR model has a low-voltage output which is intended to switch an external relay (commonly an SSR, as you note).
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Look at the numbering scheme for the TAx series PID controllers at
For example, the number for model TA4-RNR indicates that the first output is a relay; the second output is None; and the third (Aux) output is a relay.
Hope that helps Dave M
Dave M, thanks very much. That explains it nicely for me. Very much appreciated the detail you went to.
Dave
IS a pid's SSR low voltage output ac or dc?
DC
--sp
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