Re: Pump monitoring (again)

[YAP <x112358@xxxxxxxxx>]

On 2/23/06, Benfield, John (Penta) <john.benfield-eds@xxxxxxx>
wrote:
>
>  I need someone to confirm my understanding of how relays work and
will
> do what I am expecting.
>
> In my quest to monitoring my central heating I am looking at a way of
> monitoring when the various pumps come on. I already have a hardwired
> controller that links all of the timers/thermostats/pumps together.
The
> controller has a screw terminal block within it and I have worked out
> which terminals go live for each pump. What I *think* I now need it a
> 230v relay attached to these.
>
> My really really basic understanding of a relay (such as this
> http://tinyurl.com/kwtd2) <http://tinyurl.com/kwtd2%29> is
that when a
> voltage is applied across one
> set of contacts, the pair on the other side of the relay either open
or
> close. Am I correct in assuming that the 230v does not get passed
> through the relay to the second contacts - this will destroy my 1-wire
> sensors.
>
> Looking at the various relays out there I guess I need a DPDT 5a 230v,
> does this sound correct?
>
> JB


Just be careful. 230V can kill you and your dear ones if you don't know
what
you do. Your insurance will probably not be valid either after such
modifications. After considering that its perfectly fine to go on.

Cheers
/Ake

/Ake


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