Homefill pressure cut off switch?

[Icarus]

PRESSURE (sensor) SWITCH.

Elad.

That's what we're talking about? Man, thanks for the heads up. I had no clue what this thread was about.

[elad65]

pretty sure you are incorrect^^^. volume is the correct concept since we are talking about a tank or bank of tanks that is exponentially larger than the tanks the homefills are designed to fill.

the homefills shut off at dead on 2000 psi with the small tanks that come with them and with my k's they went over that mark. by quite a bit. i doubt my gauge is off by 200 psi.

i do think volume has something to do with this equation on the pump. maybe at the top end pressure with those volumes, the tanks begin to apply to much backpressure to the homefill/s pump to adequately shut them down.

the weird part is that my sytem is on a loop with a homefill on each end and neither of them shutdown at 2000. yet when i put a little tank on each one individually, they filled almost exactly the same rate and both shut down right at 2000 psi.
my theory.

Think you misunderstood my comment by system being controlled by pressure, you interpretation of how system shuts down at 2000psi as a function of pressure. That is exactly what I am saying.


VOLUME would be amount of oxygen stored. Does not matter if its 1 tiny tank (40 cu-ft) or 20 K tanks. What controlled system as when to cutoff "filling" operation is PRESSURE. A given amount of pressure will determine the volume (amount) of gas stored in a fixed size storage vessel.

Since home fill unit does not measure volume it has pumped through its own compressor, it has to determine its maximum safety limit which would be pressure there for system cuts off when its internal pressure reaches the calibrated limit of the pressure switch (2000 psi).

IF there was no safety limit switch (pressure switch) unit would continue to pump till its either self destructed or something blew up because it had a pressure applied to it beyond its "safe" capacity.

IF system never reaches the pressure limit (user drawing off oxy or a leak) them home fill unit will continue to produce whatever VOLUME of oxygen into storage vessels it is capable of....

Elad

[Emmett's Glass]

Think you misunderstood my comment by system being controlled by pressure, you interpretation of how system shuts down at 2000psi as a function of pressure. That is exactly what I am saying.


VOLUME would be amount of oxygen stored. Does not matter if its 1 tiny tank (40 cu-ft) or 20 K tanks. What controlled system as when to cutoff "filling" operation is PRESSURE. A given amount of pressure will determine the volume (amount) of gas stored in a fixed size storage vessel.

Since home fill unit does not measure volume it has pumped through its own compressor, it has to determine its maximum safety limit which would be pressure there for system cuts off when its internal pressure reaches the calibrated limit of the pressure switch (2000 psi).

IF there was no safety limit switch (pressure switch) unit would continue to pump till its either self destructed or something blew up because it had a pressure applied to it beyond its "safe" capacity.

IF system never reaches the pressure limit (user drawing off oxy or a leak) them home fill unit will continue to produce whatever VOLUME of oxygen into storage vessels it is capable of....

Elad

Why does my head feel like someone has been playing basketball with it?
E

[STROKER]

Think you misunderstood my comment by system being controlled by pressure, you interpretation of how system shuts down at 2000psi as a function of pressure. That is exactly what I am saying.


VOLUME would be amount of oxygen stored. Does not matter if its 1 tiny tank (40 cu-ft) or 20 K tanks. What controlled system as when to cutoff "filling" operation is PRESSURE. A given amount of pressure will determine the volume (amount) of gas stored in a fixed size storage vessel.

Since home fill unit does not measure volume it has pumped through its own compressor, it has to determine its maximum safety limit which would be pressure there for system cuts off when its internal pressure reaches the calibrated limit of the pressure switch (2000 psi).

IF there was no safety limit switch (pressure switch) unit would continue to pump till its either self destructed or something blew up because it had a pressure applied to it beyond its "safe" capacity.

IF system never reaches the pressure limit (user drawing off oxy or a leak) them home fill unit will continue to produce whatever VOLUME of oxygen into storage vessels it is capable of....

Elad

then please help me understand why my system will not shut down at 2000psi with the big tanks and dead nuts on it with the tiny ones?

[drew1492]

I blame it on Gremlins

[elad65]

then please help me understand why my system will not shut down at 2000psi with the big tanks and dead nuts on it with the tiny ones?

Possibly the 2000 psi reading on gauge is not the same as the calibration on pressure switch of home fill, It maybe a accuracy issue.

Have you let home fill run past the 2000 psi (on tank gauge) and see if home fill shuts off at maybe 2050psi or 2100 psi?...

Small tank or large tank, any pressure reading on gauge means "same pressure" --- Volume is a matter of how much space is in tank. For instance volume of a small bottle of soda (16 oz) is less soda than a large bottle of soda (1 liter) but the pressure of the CO2 in bottle that keeps the cola carbonated is the same.


vol·ume
   [vol-yoom, -yuhm]
noun
1. a collection of written or printed sheets bound together and constituting a book.
2. one book of a related set or series.
3. a set of issues of a periodical, often covering one year.
4. History/Historical . a roll of papyrus, parchment, or the like, or of manuscript.
5. the amount of space, measured in cubic units, that an object or substance occupies.

pres·sure
   [presh-er] Show IPA noun, verb, -sured, -sur·ing.
noun
1. the exertion of force upon a surface by an object, fluid, etc., in contact with it: the pressure of earth against a wall.
2. Physics . force per unit area. Symbol: P Compare stress ( def. 6 ) .
3. Meteorology . atmospheric pressure.
4. Electricity . electromotive force.
5. the state of being pressed or compressed.


Elad