Alternative Power sources - Re: Water pressure (depth) sensors?

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Re: Water pressure (depth) sensors?

sandra.bullock@zonnet.nl

2005-10-15, 5:21 pm

a) what accuracy do you require ?
b) what medium do you have (potable water / rain water or poluted /
salt water) ?
c) is this for permanent use or only temporary ?
d) do you need continuous readout ?

You would require a "vented gauge" sensor sealed to IP68. This is not
cheap. $500 sounds reasonable.

Possible alternative is the good old bubble principle. Mount a pipe
almost to the bottom in the cistern, and slowly pump air through the
top of tube, (like limonade with a straw). You can measure the air
pressure (which is the same pressure as the hydrostatic pressure at the
bottom of the tank) with a cheap (maybe <$100) pressure transmitter
(which is not submersible, and is compatible with air, not with water)
e.g. Honeywell or Motorola.

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