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???
11/01/09 07:48
Modified:
  11/01/09 07:54
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 		 #170306 - This looks like your USP opportunity!
Responding to: ???'s previous message
Jason Arkwright said:
simply lowest cost. The nearest alternative is to use a solid state relay

From a very quick scan of Farnell, it looks like a relay is about £5 and a solid-state relay about £50. So, on component cost alone, you'd be ahead after replacing the relay 10 times - which is under 2 years, by your previous figures.

And, as Erik said, there is a lot more cost associated with replacing the realys than just the price of the parts!
Also, it makes the prouct itself (and, possibly, its installation) more expensive if it has to be built to facilitate routine relay replacement.

one up on that would be a single phase thyristor stack or bridge

Really?

Surely single triacs are readily available at suitable ratings??

but cost and size dictate.

Again, a very quick scan of Farnell shows several 25A 600V Triacs available in TO220 packages at under £2 !!


List of 51 messages in thread
TopicAuthorDate
89s52 PID controller            01/01/70 00:00      
   ?            01/01/70 00:00      
   The question is            01/01/70 00:00      
      USP            01/01/70 00:00      
         freelance employee (sic)            01/01/70 00:00      
      Which market(s)            01/01/70 00:00      
      Is it ready?            01/01/70 00:00      
         Andy's reply            01/01/70 00:00      
            I'll take that as a "No", then?            01/01/70 00:00      
   Re: where to from here            01/01/70 00:00      
      the dissolution meter industry ...            01/01/70 00:00      
         Do you mean desalination            01/01/70 00:00      
            no, dissolution            01/01/70 00:00      
   On Production            01/01/70 00:00      
   89s52 PID controller            01/01/70 00:00      
      Self tuning ?            01/01/70 00:00      
         H i Steve,            01/01/70 00:00      
            How do penetrate the market...            01/01/70 00:00      
               I wonder too            01/01/70 00:00      
               Andy's reply            01/01/70 00:00      
                  what do you want???            01/01/70 00:00      
                     Reply to Erik.            01/01/70 00:00      
                  RE: I am asking for advice on 8052.com            01/01/70 00:00      
                  How does someone get their hands on it?            01/01/70 00:00      
                     Hi Justin            01/01/70 00:00      
                        Depends on their line of business            01/01/70 00:00      
                        That might actually be harder            01/01/70 00:00      
                        I think that would have to be the way to go            01/01/70 00:00      
                           Thanks Steve and Andy,            01/01/70 00:00      
                              Not processor but skills of the developer that matters            01/01/70 00:00      
                              Open it ?            01/01/70 00:00      
                              the other two available MPU platforms            01/01/70 00:00      
                        The market.            01/01/70 00:00      
                           URL            01/01/70 00:00      
      Just for Reference PID is an old technology            01/01/70 00:00      
         Prove it....            01/01/70 00:00      
            Supposed Real life results            01/01/70 00:00      
               But are they relevant?            01/01/70 00:00      
                  The Engineering Principle            01/01/70 00:00      
                     Robust ?            01/01/70 00:00      
            Agreed - what a rubbish paper!            01/01/70 00:00      
   16amp pwm relay?            01/01/70 00:00      
      It's just a standard electro mechanical relay....            01/01/70 00:00      
         Sounds like the wrong part for the job, then?            01/01/70 00:00      
            The reason for the relay is....            01/01/70 00:00      
               lowest cost????            01/01/70 00:00      
               This looks like your USP opportunity!            01/01/70 00:00      
   Some more thought...            01/01/70 00:00      
   What kind of heaters have you tested it on ?            01/01/70 00:00      
   Congratulations!            01/01/70 00:00      
   Congratulations II !            01/01/70 00:00      

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