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Oxygen Pressure Alarm


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#1 akflightmedic

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Posted 23 August 2009 - 08:00 AM

Ok, so I just took receipt of a 2000 F350 Super duty 4x4 ambulance.

The way this box is designed, places the main O2 cylinder under the bench seat which is a first for me. This means I now have to turn on the main O2 when I load a patient and remember to shut it off when we offload.

Anyways, here is the problem. The O2 has a low pressure alarm that emits this annoying high piercing alarm when ever the main O2 is shut off and the power is turned on to the module. You have to jump in back and hit the silence button and then it is fine, however it is not practical for us to do this every time before responding to a call. We must have the power on while responding or the lights and sirens do not function plus the AC will not be cooling the back.

My other option is to leave the main O2 on all the time thereby eliminating the trigger for the alarm, however we have discovered when we leave the main O2 turned on that there is a small leak and we do not wish to deplete our O2 levels as getting tanks refilled is not the easiest task at my current location.

Does anyone have any suggestions on how to over ride this alarm or keep it from triggering?

Is anyone familiar with this type of setup?
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#2 Chief1C

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Posted 23 August 2009 - 09:00 AM

All of our Horton rigs had this. Every time I start our 98 Horton, put it in drive, that damn alarm goes off. "Oxygen Warning" the console reads. Any oxygen in the line at all, will set it off. Now on ours, you can cancel it out by pressing one of the two buttons right below the data screen. However, the best way to override it, is to bleed the system completely after you shut off the oxygen. To do this, kill the tank. Shut the rig off, open the manual bypass valve, and run either a demand or a flow meter until opening and closing the bypass doesn't cause the ball (if you have conventional flow meters) to rise and fall.

We have a demand valve hooked to the wall over the bench seat, so that's how I bleed the system off. We had a Ford Superior ambulance, similar to a Baltimore Box (yeah - the same people who made the Cadillac Superior) for a few months in 2001. It was set up to run off of three "E" cylinders.. and that just won't work with our time on the road. So, we hooked up it's piped system, an under the bench model.

Didn't have an alarm, hell, it's seats were fold down and it had shock lamps (blue light); lucky it had oxygen at all. But I recall doing a few transports.. Getting the patient all ready, slamming my head on the too low to be legal ceiling, and cursing.. Stop.. Open the back door, get out, peer into the dark hole, turn on the oxygen tank, climb back in, hit head on hanging stretcher hardware, curse, slam door shut, it bounces back open, remember that it's a D ring handle, close it again... Okay, go.. Anyhoo.

I can tell you how we accidentally disabled the oxygen pressure sensor in our 09 Marque.. Rip the wires out of the regulator. There should, or may be wires hooked directly to the main tank regulator. They go to the sensor and alarm. If they aren't attached, it won't work. As to how they became detached. :whistle:
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#3 akflightmedic

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Posted 23 August 2009 - 10:06 AM

No worries mate!

Since I am the boss, there is no need to "accidentally" do anything.

I got brave, removed the panel, traced the wires and actually found a plug adapter, so that is what I did. A simple unplugging as opposed to cutting...but I was prepared either way. :)
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#4 spenac

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Posted 23 August 2009 - 03:01 PM

:o You disabled an alarm. How could you? Don't you know if you don't have the alarms, wear gloves with every patient, etc that that that that nothing will happen? :P
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#5 tniuqs

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Posted 23 August 2009 - 06:30 PM

No worries mate!
I got brave, removed the panel, traced the wires and actually found a plug adapter, so that is what I did. A simple unplugging as opposed to cutting...but I was prepared either way. :)


Brave or (fill in the blank) cut wires may lead to way more issues with ground fault interrupter :o

The way this box is designed, places the main O2 cylinder under the bench seat which is a first for me. This means I now have to turn on the main O2 when I load a patient and remember to shut it off when we offload.


Under your ass ? ... one of my trucks is external access to MAINS ... quit your whining pretty boy :spell:

Anyways, here is the problem. The O2 has a low pressure alarm that emits this annoying high piercing alarm when ever the main O2 is shut off and the power is turned on to the module. You have to jump in back and hit the silence button and then it is fine, however it is not practical for us to do this every time before responding to a call. We must have the power on while responding or the lights and sirens do not function plus the AC will not be cooling the back.



Could do a procedure change open side door and turn ON O2 MAIN before ignition ? Do you have shore line charger system and keep power ON to panel, could save you from using all your D and E tanks in the event that occurs.

Ah the design for dummy's frankly, as that is stupid design in itself It SHOULD be Low Pressure alarm even with no key in the ignition or power ON ! as that way one would hear the alarm before a call out, sheesh engineers have no idea sometimes, The way these things are designed now it is presumed that MAIN 02 ia always ON, flow meters OFF as in a metro service but no consideration for any OTHER applications, I don't think you have a spare gut wagon to dispatch do you ? :mobile:


Ok safety/medic boss man ... Your defeating an alarm that is telling you something, Now if I am picking up what your laying down that is ... I suspect you either do have a LEAK somewhere, OR your bleeding off internal O2 internal circuitry pressure, engineers design theory there is always pressure in the system ( I think it was made for Fire Based Medics) .... I sense incoming LOL.


Options to consider:

1- You have a leak.
2- Your bleeding off pressure every trip, So DONT leave the syestm pressurized, so what if you loose 200 psi a month.

LEAK TEST:

Turn off the Main and assure that the "ALL" O2 outlets are either turned (or removed) off then observe the pressure over 24 hours a dropping pressure/ alarm indicates a leak somewhere, No drop in pressure then a good system.

If it Alarms:
a) Flow meter leak (eliminate from circuit) try pressure test again.
B) You may have an factory internal circuit leak.
c) Wall outlet leak.

SO if you get an alarm you have a leak somewhere, a spray bottle with a touch of detergent will help you find it (do I need to say turn the power off and don't spray the electric looking stuff) :rolleyes:

ELECTRONIC issue.

It could be your Main regulator needs a Bio med tweak or even put an in line gauge to check to see if its a regulator needs pressure adjustment and set higher than the electronic pressure sensor or if its the electric pressure sensor (is that adjustable?) or is it just a stupid little plastic box that you disconnected electrical leads or the alarm box AND does if function to alarm for other reasons too ? just saying.

A jury rigged Burdon Gauge with "items" borrowed from car pool or aircraft maintenance, always an option if you want to do some pressure testing.

If you DO NOT want to work with the dummy system, although if some clown leaves a flow meter ON and the MAIN ... YOUR HOOPED AGAIN and have to change out a MAIN, it kinda delays a response too. :thumbsdown: but seeing as your the big safety/boss/hose monkey man ... turn off the idiot alarm and hope and trust everyone on the truck does the same and turn off the MAIN every call ... yea ok cause that has never happened to me, right then ( a bit more involved when M tank is fixed on a King Air) and back to more incident reports.

Just a suggestion do daily AM 02 checks, SOP (recorded) if you decide to defeat idiot alarms.

cheers

Edited by tniuqs, 23 August 2009 - 06:38 PM.

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