IDA-71 MOD and time

Corallaro

After the diluent line in previous page.....

The Electronic

I use three (3) oxygen sensor "Analitical Instruments PSR-11-75D"
and three (3) cheap "3-1/2D LCD Digital Panel Meter PM 438"

i subst the original r2 with one of 430 ohm and set the solded jumper for decimals.

no load resistor

i see that the "PM 438" have the important function of "LO BAT" and in "lo bat" the reading is more Ok..
another LED Diplay that i used for experiment when the battery is low give higher value then real whit risk of hipoxia

out of water it seems to work.................................

Attached Images

	sensors.jpg (28.6 KB, 361 views)
	display.jpg (61.6 KB, 352 views)
	case.jpg (74.8 KB, 347 views)

ScubaG

How do you zero /calibrate the meter ?
Do you use the pot on the back ?
I use PM-128 meters and find that as the sensor deteriorate it quickly get's to the point where you can not zero at 20.9 it will read 16 or less.

Corallaro

Hi ScubaG

i use the pot on the back, it is not too comfortable like as multi-turn pot but it work

is needed to replace the the original r2 with a different one (in my case one of 430 ohm) to have the correct range

with your sensor, to test, you can use a 1 kohm pot and then replace it with a fixed resistor

in my circuit i use a "K1-D like" sensors that need an high load resistor so i don't use any load resistor buth other sensors need it

i modify my diplay case with three holes, and caps to make a calibration first of any dive if needed (i use a pressure pot to test the eventualy current drop)

i calibrate my sensors in pure O2 then test its in 1,6 ppO2 with a pressure pot an then obviously in AIR when i disconnect sensors from pressure pot..
(drop pressure slowly first disconnect sensor holder from p-pot)

in a mixed gas CCR ... electronic or manual the correct read of ppO2 is vital

and test display reanding in low battery case

Giovanni

Attached Images

	retro display.jpg (77.5 KB, 186 views)
	Dscf3777.jpg (77.2 KB, 185 views)

teomannaskali

I have a IDA64 pure o2 rebreather. And I would like to start using it. Its not in bad condition... It just needs the hoses to be replaced and the mouthpiece is missing. Also the tank has not been tested for a while. I have a 2.7 liter O2 tank with a poseidon xstream O2 regulator. How could I attach this isstead of the default O2 tank and regualtor. Where can I find the adaptor for the DSV (O2 in this case as it is O2 rig). Does somone make these? Is the reg a HP regulator?

If it is a LP reg then can someone make me an adapter for it, standard bc nipple to ida dsv.

Or is there a better standard way of doing this.

Thank you in advance.

Teoman

Photos IDA-64