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Cam,
I did the same thing you're talking about but with a few "refinements". I got
an adjustable valve from Lowes (about $5) and put it inline between the LP
inflator connection and the sensor. I calibrated the flow using a flow meter
and set the valve to allow 5LPM. The valve is connected through a
plastic tube to a barb adapter (part number C050014-00, about $7 from maxtec)
which screws directly to the maxtec (formerly ceramatec) MAX250 sensor which is
hardwired to the circuit board.
The whole thing works great. You just calibrate and test by plugging in the LP
inflator hose and opening the valve. I talked to the engineer at Maxtec about
leaving the sensor uncovered and he said there is no need to keep the sensor
covered. The tape they are shipped with is to help the shelf life but shouldn't
be used to keep it covered. If the sensor is covered long enough to use up all
the O2 it could take several minutes to get an accurate reading when turned on.
My setup is pretty new so I'll be checking the calibration of the valve
periodically but I don't see any reason why it should change.
Also, the jumper settings that were in the Oxygen Hacker
manual weren't correct for the circuit board I got so make sure to read the
insert sheet that comes with the CB.
C.
***********************************
So, I'm building an oxygen sensor per plans from Vance's Oxy Hacker
Companion.
Rather than having the O2 sensor at the end of a jacked cable though,
I'm thinking about hardwiring it INSIDE the aluminum case I'm using.
Then I'll put a male QD hose fitting through the case bulkhead, with a
flow restrictor, and a vent at the opposite end of the case.
In theory, when you connect to a reg lp hose, the test gas will flood
the inside of the case and expose to the sensor, while the vent will
prevent atmosphere from going above ambient.
Anyone out there think this is not a good idea? I kind of like having
the whole thing in one box and not having to rig up some rinky dink
method to encapsulate the sensor when testing the gas. Thanks.
Cam
--
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Cameron Banks 408-821-6314 cell
Applied Materials Account Manager 888-731-6502 pager
408-934-0500 office
408-934-0707 fax
Aera Corporation
422 S. Hillview Drive e-mail: cam@ae*.co*
Milpitas, CA 95035 http://www.massflow.com
Chris Elmore
University of SC
(803) 777-1534 office
(803) 348-3055 mobile
Chris@sc*.ed*
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