PID whats a good price?

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edit1now
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Post by edit1now » Sun Dec 16, 2007 2:03 pm

I have a box, and a sackload of bits, and I'm probably going to start drilling holes in the box over Christmas. Today I'm finding out what value of shunt I need across the current transformer to give me 12 volts to make a little light come on (I want to know my element is OK by having an OK light on the panel).
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Vossy1

Post by Vossy1 » Sun Dec 16, 2007 7:59 pm

Maplins sell a 12-240v vaiable volt LED which fits the purpose nicely.
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Post by edit1now » Sun Dec 16, 2007 9:07 pm

Thanks for that.

The only one I could find on their website is this: http://www.maplin.co.uk/module.aspx?Mod ... urrent LED

Is that the one you meant?

Today I can't do short URLs...
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Vossy1

Post by Vossy1 » Sun Dec 16, 2007 9:15 pm

Maplins sell a 12-240v vaiable volt LED which fits the purpose nicely.
That's totally wrong and wasn't what I meant :oops: :roll:

My PID output to SSR is 12v. It is the LED you linked. On your link the first url should read constant current LED
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Post by edit1now » Sun Dec 16, 2007 9:39 pm

Thanks.

What I'm really after is a way of detecting current in the element circuit, since I have a habit of blowing elements. I'm going to ask the broadcast engineers at work tomorrow, having spent a couple of happy hours in a freezing garage this afternoon finding out that the 2.2kW element makes 0.35V appear across a 1.7 Ohm resistor across the 40A current transformer :wacko:
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