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brian
the sensors that you are looking
for are teledyne analytical instruments
class r-22d, o2 sensors. they put out a milli volt
singal directly perporsional to the amount of o2 present the average
output is 7-13 mv in air at stp. the need to be loaded with a 10k resister.
Measure the output with a milli volt meterany kind will do. if the voltage drops
ten percent you know that your o2 levels droped ten percent.
o2 control can be done three
ways.
1.o2 level monitoring with a
solinoid for injection
pros hands
off automatic control
cons
expensive and complex
2. automatic pressure controller
maintain sub internal pressure to a fixed
point
pro single
controller all mechaincal/ about half price of electrical
con
compressed air leak internal inside sub will shut down system
3. adjustable flow controller
manual
pro
cheapest
con requires
continous monitoring
hope that this helped for your design
ideas
rick m
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