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Richard Erlacher
08/22/12 13:33
Read: 452 times
Denver, Co
USA


 
#188119 - You might want to look into that a bit further
Responding to: David Brown's previous message
I've been told, though I've never had to follow through and make a study of it, that even fairly low voltage, if it somehow gets into the cardiovascular system can be quite injurious, at least in the short term, and that this is the reason most commercial labs keep the power supplies low in places people are likely to be inadvertently exposed.

Water is generally not so conductive, but, as you've experienced yourself, it can cause unpleasant effects.

Because it also can be conductive, it can, perhaps, influence what a potentiometer represents about its position. A strobe wheel might be a better thing to use. Those can be mounted on relatively water-tight bushings or even bearings, allowing for isolation between the innards and outside, which would be the user interface. A slider on an optically sensed strobe strip might be a possibility, too, wouldn't it.

RE






List of 22 messages in thread
TopicAuthorDate
Designing a product for use in water      David Brown      08/21/12 17:39      
   Have you considered silicone coating?      Richard Erlacher      08/21/12 21:11      
   one link      Stefan KAnev      08/21/12 22:04      
   Waterproof enclosures      Oliver Sedlacek      08/22/12 02:12      
      Projective touch - or maybe waterproof tablet      Per Westermark      08/22/12 06:27      
         If that potentiometer wasn't a hard requirement      Erik Malund      08/22/12 08:00      
            more details      David Brown      08/22/12 10:54      
               You might want to look into that a bit further      Richard Erlacher      08/22/12 13:33      
                  buttons for up/down gives tactile feedback      Per Westermark      08/22/12 14:12      
                     nevertheless, a strobe wheel rather than a pot ...      Richard Erlacher      08/22/12 15:24      
                        more good ideas      David Brown      08/22/12 16:42      
   Go to the lowest practical voltage      Jim Granville      08/22/12 16:20      
      answers      David Brown      08/22/12 17:39      
         Electric shock and intrinsically safe      Oliver Sedlacek      08/23/12 02:11      
            Isolators      David Brown      08/23/12 19:13      
               a question and a reference      Erik Malund      08/24/12 07:05      
                  answers      David Brown      08/24/12 10:55      
                     tethered unit??      Erik Malund      08/24/12 12:12      
                        mounted display      David Brown      08/24/12 12:32      
                           have you considered a combination of battery and solar?      Richard Erlacher      08/24/12 14:56      
                              indoor pool      David Brown      08/27/12 10:24      
                           Wireless chargers      Oliver Sedlacek      08/27/12 15:30      

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