A green and clean environment is a human right!
Projects by members => Projects by members => J. Miller => Topic started by: jim miller on December 29, 2012, 15:35:17 pm
-
"Description of the Control Sequence for Automated Eudiometer Readings
Control sequence of the solenoid valves
1 Inital State
The eudiometer is initally empty. The solenoid valves A, B, C, and D are in the closed position.
2 Filling Step
Solenoid valves A and C are then opened allowing air to escape at top and water to start to fill the eudiometer.
3 Stopping Water Filling
Solenoid A is controlled by sensor E, When the water level reached level E the solenoid valve A
is activated to stop the flow of water into the eudiometer.
4 Sealing the top of the eudiometer
Solenoid valve C is then closed. Even if solenoid valve B were opened, atmospheric pressure would
maintain the water level E in the same manner that the atmospheric pressure maintains the
level of mercury in a barometric tube. (The bottom of tube uses a water bath as a lower seal)
5 Opening the drain solenoid
Solenoid valve B is then opened which would now allow water to drain as gas was introduced
above level E
6 Introduction of gas to be measured
Solenoid valve D is opened allowing gas to flow into the eudiometer and now the
water level will drop.
7 Shut off of gas input
When the waterl level drops to the level of Sensor F, the gas input solenoid valve D is closed
Measurement of the elapsed time for the water level to drop from level E to Level F
is determined by the time of opening of the Solenoid D and the closing of solenoid
D which is controlled by sensor F."
----------------------------------------------------------------------------------------------------------------------------
The sensor positions are movable so that the amount of gas measured can be adjusted.
Callibration of the eudiometer tube maybe done by introducing a meaured quantity of water and
determining when the sensors E and F are activated or gradations may be marked on the
eudiometer tube based on sequential measured aliquots of water that is added.
Thus, when a given amount of gas is produced in a given amount of time an estimate of the gas production
may be obtained
For the home experimenter, low power solenoids of the type used to control lawn sprinklers, sensors
that are used to control garage doors and sports digital stop watches may be adequate
A low voltage furnace transformer may be adequate for solenoid operation. The start/ stop buttons of the
digitat timer could be modified to control the various solenoids/cameras
A timing loop may be added for repetative tests
As komtek pointed out to me ,solenoid valves A and B do not have to be located in the overflow vat. An overflow tube to the
hazmat container was not included in the rendering
-----------------------------------------------------------------------------
"8 Flush cycle/Filling step
Solenoid valves D and B are closed, with solenoid valves A and C are opened to exhaust gas. Flammable or explosive
gases need to be appropriatley vented..
This esentially the same as the filling step
The above apparatus measure the amount of gas produced per unit time.
HHO flow meters that rely upon a floating bead need calibration."