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>Posted on 14 Jun 1996 at 20:32:35 by SATURN.DDRAKE05@gm*.co* > What I think could be a possibility for checking if a scrubber is warm > (working or not) is an array of temp sensors and an ambient gas temp > sensor. If you are able to determine the difference in ambient gas > going into the scrubber and the active zone of the scrubber, then the > array could be connected so that a red LED comes on when the is no > warmer scrubber area. Green would be displayed on power on if there > is a warm area, red if not. If you wanted to "prebreathe" the > scrubber to warm it up for cold water diving, you just prebreathe and > watch until the light switches red to green. I was initially thinking stacks of LEDs. Each stack indicating the amplitude of one temp. sensor. One LED is simpler but I feel this is a bit lean both as an indicator and when considering the various failure modes: say the Green LED is blown. One could have a microprocessor cycling through the display to confirm it's operation at power-up but I have seen non-redundant computer based electronics fail in nasty un-obvious ways and disslike devices whose operation depends on electronic memory. However, one type of displays that I like and use in my powered devices are blinking LEDs where the frequency of blinking is moderated by a voltage. This could work well in a rebreather and allow total redundancy for all sensor elements and confirmation that everything is working. . It also conserves power and is intelligible under almost any ambient light condition. I guess the easiest way to mount the temp sensors is in the wall but one probably should check the temp profile throughout one cross-section to see the relations. And I guess the wall must be thermally insulated from ambient. John cc015012@br*.br*.ed*
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