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Vacuum Guage hookup

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n616tb(at)btsapps.com
Guest

Posted: Sun Dec 02, 2007 4:17 pm Post subject: Vacuum Guage hookup

I have a small vacuum gauge that has two smaller ports on it labeled V and

P.  I assume the V is for the vacuum and the P would be the export.  I

understood there was a port on some of the other gauges that would allow me

to just run a hose from it to the vacuum gauge.  Does this suction gauge

need to be plumbed in series with the other gauges in order to take

advantage of the filtered air?  It has smaller ports on it so would have to

find a hose that would fit between the larger ports on the gauges and the

smaller port on the suction gauge.



Any thoughts?

Thanks

Tim

Vanremog(at)aol.com
Guest

Posted: Sun Dec 02, 2007 5:43 pm Post subject: Vacuum Guage hookup

In a message dated 12/2/2007 4:18:37 P.M. Pacific Standard Time,  n616tb(at)btsapps.com writes:

  	  Quote: 	
		  I have a    small vacuum gauge that has two smaller ports on it labeled V and

P.     I assume the V is for the vacuum and the P would be the export.     I

understood there was a port on some of the other gauges that would allow    me

to just run a hose from it to the vacuum gauge.  Does this suction    gauge

need to be plumbed in series with the other gauges in order to    take

advantage of the filtered air? 	


 

 ===========================================

  

 Actually, that would be the intuitive take on things, but it would  be exactly wrong.  The P stands for Pressure (in this case the  negative pressure) that is seen at the intake of the vacuum pump (but before the  regulator).  The V stands for Vent (in this case Static) or ambient outside  pressure (or aircraft ambient).  Look for a Rapco schematic that I think is  available on the web or in the ACS catalog and it explains the whole setup in  detail.

  

  

  

 N1GV (RV-6A, Flying 870hrs, O-360-A1A, C/S, Silicon  Valley) 



hottest products and top money wasters of 2007.

  [quote][b]

denis.walsh(at)comcast.ne
Guest

Posted: Sun Dec 02, 2007 5:49 pm Post subject: Vacuum Guage hookup

V is usually for vent and P is for the pressure or "suction".  refer  

to Aircraft spruce which used to have an excellent schematic for how  

to do a suction system.



In my case I left v alone and hooked the p to one of the suction  

instruments.  the whole shmear is in series with the air coming  

through the big filter first, then to the two instruments, then to the  

regulator, then to the pump.

On Dec 2, 2007, at 5:14 , Tim Bryan wrote:



 	  Quote: 	
		   



 I have a small vacuum gauge that has two smaller ports on it labeled  

 V and

 P.  I assume the V is for the vacuum and the P would be the export.  I

 understood there was a port on some of the other gauges that would  

 allow me

 to just run a hose from it to the vacuum gauge.  Does this suction  

 gauge

 need to be plumbed in series with the other gauges in order to take

 advantage of the filtered air?  It has smaller ports on it so would  

 have to

 find a hose that would fit between the larger ports on the gauges  

 and the

 smaller port on the suction gauge.



 Any thoughts?

 Thanks

 Tim

dbris200(at)sbcglobal.net
Guest

Posted: Sun Dec 02, 2007 6:28 pm Post subject: Vacuum Guage hookup

Tim,

The gyro should have a small port which goes to the gauge. The "V" is 

the "vent" and the "P" is pressure (positive or negative) so the "P" 

connects to the gyro. Since there is no airflow through the gauge, there 

no need to connect the "V" to anything or worry about filtered air.



Dave



Tim Bryan wrote:

 	  Quote: 	
		   



 I have a small vacuum gauge that has two smaller ports on it labeled V and

 P.  I assume the V is for the vacuum and the P would be the export.  I

 understood there was a port on some of the other gauges that would allow me

 to just run a hose from it to the vacuum gauge.  Does this suction gauge

 need to be plumbed in series with the other gauges in order to take

 advantage of the filtered air?  It has smaller ports on it so would have to

 find a hose that would fit between the larger ports on the gauges and the

 smaller port on the suction gauge.



 Any thoughts?

 Thanks

 Tim

n616tb(at)btsapps.com
Guest

Posted: Sun Dec 02, 2007 6:56 pm Post subject: Vacuum Guage hookup

Thanks everyone for the responses.  I surely would have got it backwards.

The question then is if the pressure (P) were to be negative then wouldn't

there be air flowing through the gauge?  If I don't put a filter on the vent

side you say it would be OK?



Tim



[quote] --

n801bh(at)netzero.com
Guest

Posted: Sun Dec 02, 2007 8:00 pm Post subject: Vacuum Guage hookup

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit.

n616tb(at)btsapps.com
Guest

Posted: Mon Dec 03, 2007 7:27 am Post subject: Vacuum Guage hookup

Ben,  

   

My suction gauge has two ports on it.  One labeled V and the other labeled P.  Mine is a U.M.A, Inc part number 3-200-12, PMA part.  

Does this make a difference?  

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Sunday, December 02, 2007 9:54 PM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit..  

Ben                        do not archive  



 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:

 --> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com>

 

 Thanks everyone for the responses.  I surely would have got it backwards.

 The question then is if the pressure (P) were to be negative then wouldn't

 there be air flowing through the gauge?  If I don't put a filter on the vent

 side you say it would be OK?

 

 Tim

 

 > --

n801bh(at)netzero.com
Guest

Posted: Mon Dec 03, 2007 8:14 am Post subject: Vacuum Guage hookup

Tim. It has been three years since I installed mine in my experimenatl but if I remember correctly there was two versions. The one with a single port was for vacuum only. The one for dual purpose had two ports, My thoughts were there is a diaphram that drives the needle in the gauge. Vacuum is introduced into one side of the diaphram and that moves the needle the correct way. If one was using a pressure system to drive the gauges that pressure is introduced on the opposite side of the diaphram. That way one gauge could be used in both applications. If your plane is running a vacuum system my guess is to hook up to the ' V ' port...

do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "Tim Bryan" <n616tb(at)btsapps.com> wrote:



<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />Ben,

 

My suction gauge has two ports on it.  One labeled V and the other labeled P.  Mine is a U.M.A, Inc part number 3-200-12, PMA part.

Does this make a difference?

Tim

 

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

Sent: Sunday, December 02, 2007 9:54 PM

To: <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />rv-list(at)matronics.com

Subject: RE: Vacuum Guage hookup

 

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit.

n616tb(at)btsapps.com
Guest

Posted: Mon Dec 03, 2007 8:17 am Post subject: Vacuum Guage hookup

Ok, I got it figured out.  ACS sells a fitting that goes in the back of one of the main gauges that is a T fitting.  The 3/8” side is for the suction/ vent and a T part that is ¼” to go to the suction gauge.  I ordered two of these ($$) so I could T into both the vent and the suction sides of the hoses.  

   

I found this diagram and fitting part numbers on ACS suction kit installation documents.  

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Tim Bryan

 Sent: Monday, December 03, 2007 9:25 AM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

Ben,  

   

My suction gauge has two ports on it.  One labeled V and the other labeled P.  Mine is a U.M.A, Inc part number 3-200-12, PMA part.  

Does this make a difference?  

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Sunday, December 02, 2007 9:54 PM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit..  

Ben                        do not archive  



 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:

 --> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com>

 

 Thanks everyone for the responses.  I surely would have got it backwards.

 The question then is if the pressure (P) were to be negative then wouldn't

 there be air flowing through the gauge?  If I don't put a filter on the vent

 side you say it would be OK?

 

 Tim

 

 > --

n616tb(at)btsapps.com
Guest

Posted: Mon Dec 03, 2007 8:33 am Post subject: Vacuum Guage hookup

Thanks Ben,  

   

Check out this picture:  

http://www.aircraftspruce.com/catalog/pdf/Rapco%20Vacuum%20System%20Kit.pdf  

   

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Monday, December 03, 2007 10:12 AM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

Tim. It has been three years since I installed mine in my experimenatl but if I remember correctly there was two versions. The one with a single port was for vacuum only. The one for dual purpose had two ports, My thoughts were there is a diaphram that drives the needle in the gauge. Vacuum is introduced into one side of the diaphram and that moves the needle the correct way. If one was using a pressure system to drive the gauges that pressure is introduced on the opposite side of the diaphram. That way one gauge could be used in both applications. If your plane is running a vacuum system my guess is to hook up to the ' V ' port...  

do not archive

 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:    

Ben,  

   

My suction gauge has two ports on it.  One labeled V and the other labeled P.  Mine is a U.M.A, Inc part number 3-200-12, PMA part.  

Does this make a difference?  

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Sunday, December 02, 2007 9:54 PM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit..  

Ben                        do not archive  



 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:

 --> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com>

 

 Thanks everyone for the responses.  I surely would have got it backwards.

 The question then is if the pressure (P) were to be negative then wouldn't

 there be air flowing through the gauge?  If I don't put a filter on the vent

 side you say it would be OK?

 

 Tim

 

 > --

n616tb(at)btsapps.com
Guest

Posted: Mon Dec 03, 2007 8:33 am Post subject: Vacuum Guage hookup

Also this one indicates as others mentioned that “V” is for the vent and “P” is the vacuum port  

   

http://www.aircraftspruce.com/catalog/graphics/1001100INSTALLATIONGUIDE.jpg  

   

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Monday, December 03, 2007 10:12 AM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

Tim. It has been three years since I installed mine in my experimenatl but if I remember correctly there was two versions. The one with a single port was for vacuum only. The one for dual purpose had two ports, My thoughts were there is a diaphram that drives the needle in the gauge. Vacuum is introduced into one side of the diaphram and that moves the needle the correct way. If one was using a pressure system to drive the gauges that pressure is introduced on the opposite side of the diaphram. That way one gauge could be used in both applications. If your plane is running a vacuum system my guess is to hook up to the ' V ' port...  

do not archive

 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:    

Ben,  

   

My suction gauge has two ports on it.  One labeled V and the other labeled P.  Mine is a U.M.A, Inc part number 3-200-12, PMA part.  

Does this make a difference?  

Tim  

           

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of n801bh(at)netzero.com

 Sent: Sunday, December 02, 2007 9:54 PM

 To: rv-list(at)matronics.com

 Subject: RE: Vacuum Guage hookup  

  

   

IIRC, The gauge has only one port on it so the air eally isn't passing through it, all it does is sense vacuum because it is a dead end circuit..  

Ben                        do not archive  



 

 

 Ben Haas

 N801BH

 www.haaspowerair.com

 

 -- "Tim Bryan" <n616tb(at)btsapps.com> wrote:

 --> RV-List message posted by: "Tim Bryan" <n616tb(at)btsapps.com>

 

 Thanks everyone for the responses.  I surely would have got it backwards.

 The question then is if the pressure (P) were to be negative then wouldn't

 there be air flowing through the gauge?  If I don't put a filter on the vent

 side you say it would be OK?

 

 Tim

 

 > --

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