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Which Oil Pressure Switch?
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supik

Joined: 22 Aug 2018
Posts: 70

Posted: Sun Apr 16, 2023 12:32 pm Post subject: Which Oil Pressure Switch?

Which Oil Press Switch model P/N is used in this scheme?



http://www.aeroelectric.com/PPS/Engine/Gaging/Oil_P_Warn.pdf

_________________
Igor

RV10 in progress

supik

Joined: 22 Aug 2018
Posts: 70

Posted: Sun Apr 16, 2023 1:16 pm Post subject: Re: Which Oil Pressure Switch?

It looks I found it:



https://store.vansaircraft.com/oil-pressure-switch-ie-spdt-pres-15-sw.html

_________________
Igor

RV10 in progress

Mudfly

Joined: 04 Feb 2012
Posts: 39

Posted: Mon Apr 17, 2023 6:14 am Post subject: Re: Which Oil Pressure Switch?

Hello Igor,

I'm currently researching ways to activate my hobbs meter.   Probably not

a big deal, but I would prefer something other than using a feed from 

the oil pressure.   Much like the electrical failure points discussed on this 

list, I see the extra oil fittings as possible failure points.   I know that's

primarily used  but was wondering with modern avionics could there be another way to activate the hobbs?   

Also, are you using a analog or LCD meter?   I originally planned the 

Honeywell, 2 pin LCD unit.   However, I realized the unit would only display

the digits when it was activated by oil pressure or other device used to 

complete the circuit.   I would like to see the digits when battery is 

switched on.   

I switched to the 3 pin LCD unit.  Honeywell LM-HH3AS-H21.  The pins are 

positive, negative and enable.  https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695

It will be powered off the main power bus when battery is switched on.

I now just need to figure out how to power the enable portion..other 

than oil pressure.   I found an activation switch that uses pitot pressure,

but it does not activate until 27 mph.  Don't love that either:) 

https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer

Any ideas from the group?

Shawn

neal.george(at)gmail.com
Guest

Posted: Mon Apr 17, 2023 12:16 pm Post subject: Which Oil Pressure Switch?

Shawn - 

Have you considered a vacuum switch in the intake manifold?   Activates when the engine starts, no threat or mess if it leaks.



Neal 



On Apr 17, 2023, at 4:18 PM, Mudfly <shawntedwards(at)hotmail.com> wrote:





  I found an activation switch that uses pitot pressure,

but it does not activate until 27 mph.  Don't love that either:) 

https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer

Any ideas from the group?

Shawn

kenryan

Joined: 20 Oct 2009
Posts: 426

Posted: Mon Apr 17, 2023 12:18 pm Post subject: Which Oil Pressure Switch?

I wonder if there is a vibration sensor that would be appropriate? I know that Sterling has added that feature to their B2B chargers.



On Mon, Apr 17, 2023 at 6:18 AM Mudfly <shawntedwards(at)hotmail.com (shawntedwards(at)hotmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "Mudfly" <shawntedwards(at)hotmail.com (shawntedwards(at)hotmail.com)>

 

 Hello Igor,

 I'm currently researching ways to activate my hobbs meter.   Probably not

 a big deal, but I would prefer something other than using a feed from 

 the oil pressure.   Much like the electrical failure points discussed on this 

 list, I see the extra oil fittings as possible failure points.   I know that's

 primarily used  but was wondering with modern avionics could there be another way to activate the hobbs?   

 Also, are you using a analog or LCD meter?   I originally planned the 

 Honeywell, 2 pin LCD unit.   However, I realized the unit would only display

 the digits when it was activated by oil pressure or other device used to 

 complete the circuit.   I would like to see the digits when battery is 

 switched on.   

 I switched to the 3 pin LCD unit.  Honeywell LM-HH3AS-H21.  The pins are 

 positive, negative and enable.  https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695

 It will be powered off the main power bus when battery is switched on.

 I now just need to figure out how to power the enable portion..other 

 than oil pressure.   I found an activation switch that uses pitot pressure,

 but it does not activate until 27 mph.  Don't love that either:) 

 https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer

 Any ideas from the group?

 Shawn

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=510642#510642

 

 

 

 

 

 

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Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Mon Apr 17, 2023 12:29 pm Post subject: Which Oil Pressure Switch?

On 4/17/2023 3:15 PM, Neal George wrote:

 	  Quote: 	
		   



 Shawn -

 Have you considered a vacuum switch in the intake manifold?   Activates when the engine starts, no threat or mess if it leaks.



 Neal



 On Apr 17, 2023, at 4:18 PM, Mudfly <shawntedwards(at)hotmail.com> wrote:



 

    I found an activation switch that uses pitot pressure,

 but it does not activate until 27 mph.  Don't love that either:)

 https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aerometer

 Any ideas from the group?

 Shawn

FWIW, my ancient 1st-gen Dynon D10-EMS doesn't start the clock until the 
	


plane is moving. No idea what the threshold is or how it's measured, but 

it seems likely that it's airspeed dependent since the D10 doesn't talk 

to any other instruments in the a/c.



-- 

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_________________
Charlie

rv8iator

Joined: 11 Apr 2006
Posts: 145
Location: Newberg, OR

Posted: Tue Apr 18, 2023 11:19 pm Post subject: Which Oil Pressure Switch?

There is a self powered vibration sensing stand alone Hobbs meter.  I have on, after 20 years it still continues to count hours.



I think ENM makes one and frugo.fr as well.

Chris Stone

RV-8



 	  Quote: 	
		  I wonder if there is a vibration sensor that would be appropriate? I know that Sterling has added that feature to their B2B chargers.



 	  Quote: 	
		  



 Shawn

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=510642#510642

 

 

 

 

 

 

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C. Stone (RV8iator)

Mudfly

Joined: 04 Feb 2012
Posts: 39

Posted: Thu Apr 20, 2023 6:52 am Post subject: Re: Which Oil Pressure Switch?

Several good ideas.

This company https://enmco.com/, suggested by Chris,  has several

options.  Just need to sort through them.

Thanks.

Shawn

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Apr 20, 2023 10:14 am Post subject: Which Oil Pressure Switch?

At 03:15 PM 4/17/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Neal George <neal.george(at)gmail.com>



 Shawn - 

 Have you considered a vacuum switch in the intake manifold?   Activates when the engine starts, no threat or mess if it leaks. 	


   Most of cruising flight is at high

   manifold pressure if not max (throttle

   wide open) depending on altitude.

   Hence, no significant vacuum to operate

   a switch.



   Any automotive oil pressure switch is

   suited to task. We used to sell a

   Standard pressure switch off my

   website . . .was about $10 as I recall.

  

   You can generally pick one with threads

   that exactly match the engine's oil

   pressure port without adapters hence

   very low risk of leaks when joint is

   made up with proper application of

   Teflon tape.



   These switches are generally suited

   only for sensing 'active' oil pressure.

   I.e., they close at 4-10 psi. Fine

   for your Hobbs system.



   One could drive the HOBBS through

   a voltage sensitive switch that

   runs the meter if the bus is above

   13.5 volts (alternator delivering power).

   Similarly, driving directly

   from the engine bus of an electrically

   dependent engine would work (engine

   wouldn't be running if bus is cold).



   Yeah, there are a few instances when

   the HOBBS might power up with the

   engine not running, but the errors

   generated would be small and in the

   right direction thus changing oil

   or cleaning plugs a bit early.



   There is a cute little engine hour-meter

   that runs based on sensing ignition

   system activity. 



  https://tinyurl.com/mtw27jc3  



   I've installed these on gas driven

   generators with good results. They

   sense ignition activity by means

   of a flying pigtail wrapped around

   the plug wire.  These could also

   be made to work by sensing activity

   on a magneto -lead.



   If you've got an electronic tachometer,

   the signal used to drive the tach could

   be easily conditioned to become an

   activity switch for the hour meter.



   Lots of ways to 'skin' this cat . . .



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

Mudfly

Joined: 04 Feb 2012
Posts: 39

Posted: Fri Apr 21, 2023 4:56 am Post subject: Re: Which Oil Pressure Switch?

Thanks Bob.

I like these two ideas you mentioned in your post.



1. "One could drive the HOBBS through

a voltage sensitive switch that

runs the meter if the bus is above

13.5 volts (alternator delivering power)."



2. "If you've got an electronic tachometer,

the signal used to drive the tach could

be easily conditioned to become an

activity switch for the hour meter.



I'm using a 3 wire (+,-, and enable pins) LCD meter and 

would like the numbers to display when battery is 

switched on, but not start the timer.   I'm having trouble 

finding a wire diagram for my unit, but guess the enable

pin goes to ground.   I will need to do some more 

homework to see if I can make the  options you mentioned work.   

I'm using garmin stuff so possibly there's a way to

make either option 1 or 2 above work.  If not, I may have to resort back

to using the oil pressure switch.   

Thanks again,

Shawn

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Apr 21, 2023 5:52 am Post subject: Which Oil Pressure Switch?

 	  Quote: 	
		    You can generally pick one with threads

   that exactly match the engine's oil

   pressure port without adapters hence

   very low risk of leaks when joint is

   made up with proper application of

   Teflon tape. 	


     Follow up:



     I've received a couple of notes from

     learned List readers that Teflon tape

     as a thread sealant comes with some

     risks.



     I remember writing paragraphs in Cessna

     field service documents describing the

     'proper application' of Teflon tape

     on certain fluid fittings. If the

     tape's wrappings extend too far down

     the taper, there is risk that some

     shreds created by the mating forces

     will be dropped into the fluid stream.

   

     Not a good thing. Back in '66 we

     were specific on the care taken to leave

     two threads of the fitting clear of

     tape such that ALL products of

     installation were contained in

     the joint.



     To be sure, there are less risky

     products out there for sealing

     of NPT (tapered pipe) threads and

     on the advice of our experienced

     readers, I would agree. Get some

     'better' dope if you can . . .

     but skillfully applied Teflon works

     too.



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Fri Apr 21, 2023 6:06 am Post subject: Which Oil Pressure Switch?

On Fri, Apr 21, 2023 at 8:57 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		     	  Quote: 	
		    You can generally pick one with threads

   that exactly match the engine's oil

   pressure port without adapters hence

   very low risk of leaks when joint is

   made up with proper application of

   Teflon tape. 	


     Follow up:



     I've received a couple of notes from

     learned List readers that Teflon tape

     as a thread sealant comes with some

     risks.



   (snipped)

     To be sure, there are less risky

     products out there for sealing

     of NPT (tapered pipe) threads and

     on the advice of our experienced

     readers, I would agree. Get some

     'better' dope if you can . . .

     but skillfully applied Teflon works

     too.



 

 

   Bob . . .

	
The concern with tape is that even if it's applied to the threads properly, upon removal of the device some of it can remain in the female threads, and get pushed into the passageway when the device is re-installed.

I don't know whether that's a valid concern, but I use teflon dope so I don't have to find out. 

Charlie 



Virus-free.www.avast.com[url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]

_________________
Charlie

Eric Page

Joined: 15 Feb 2017
Posts: 245

Posted: Fri Apr 21, 2023 6:13 am Post subject: Re: Which Oil Pressure Switch?

I found this, and several other fittings like it, when disassembling the header tank plumbing on my second-hand Kitfox project.  The first builder had used Teflon tape in their assembly without proper care.

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri Apr 21, 2023 7:35 am Post subject: Which Oil Pressure Switch?

At 07:56 AM 4/21/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Mudfly" <shawntedwards(at)hotmail.com>



 Thanks Bob.

 I like these two ideas you mentioned in your post.



 1. "One could drive the HOBBS through

 a voltage sensitive switch that

 runs the meter if the bus is above

 13.5 volts (alternator delivering power)." 	


   I can sketch this circuit out

   for you. Is there an installation

   document for the make/model of

   your hour meter?



   Curious: What kind of ignition

   system do you have?



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

Mudfly

Joined: 04 Feb 2012
Posts: 39

Posted: Fri Apr 21, 2023 12:58 pm Post subject: Re: Which Oil Pressure Switch?

[quote="nuckolls.bob(at)aeroelect"]At 07:56 AM 4/21/2023, you wrote:

 [quote]--> AeroElectric-List message posted by: "Mudfly" <shawntedwards>



 Thanks Bob.

 I like these two ideas you mentioned in your post.



 1. "One could drive the HOBBS through

 a voltage sensitive switch that

 runs the meter if the bus is above

 13.5 volts (alternator delivering power)." [/quote]

   I can sketch this circuit out

   for you. Is there an installation

   document for the make/model of

   your hour meter?



   Curious: What kind of ignition

   system do you have?



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    <Go> 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.[/quote]



Bob,

It's a Honeywell LM-HH3AS-H21.  The only document I have been able

to find is the data sheet on this page.    

https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695

My current electrical diagram has the unit powered off the Main Power

Bus so it should illuminate the LCD numbers when the battery is 

switched on.   I need to find a home for wire from the enable pin.



My planned ignition system is a SureFly on the left and a Slick mag

on the right.   I'm working on a post for the list for a small can of worms

I've opened with that system.

Thanks,

Shawn

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Eric Page

Joined: 15 Feb 2017
Posts: 245

Posted: Fri Apr 21, 2023 9:52 pm Post subject: Re: Which Oil Pressure Switch?

 	  Mudfly wrote: 	
		  I'm having trouble finding a wire diagram for my unit, but guess the enable pin goes to ground. 	


Here are the installation instructions for the unit you mentioned.  Wiring data is on the first page.  The enable pin is active high.



https://tinyurl.com/386autu8+

Mudfly

Joined: 04 Feb 2012
Posts: 39

Posted: Sat Apr 22, 2023 3:22 am Post subject: Re: Which Oil Pressure Switch?

[quote="Eric Page"][quote="Mudfly"]I'm having trouble finding a wire diagram for my unit, but guess the enable pin goes to ground.[/quote]

Here are the installation instructions for the unit you mentioned.  Wiring data is on the first page.  The enable pin is active high.



https://tinyurl.com/386autu8+[/quote]

Thanks Eric

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Apr 22, 2023 7:24 pm Post subject: Which Oil Pressure Switch?

 	  Quote: 	
		     Curious: What kind of ignition

    system do you have?

    Bob . . .



                     //// 

   

 Bob,

 It's a Honeywell LM-HH3AS-H21.  The only document I have been able

 to find is the data sheet on this page.    

  https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/LM-HH3AS-H21/5069695 

 My current electrical diagram has the unit powered off the Main Power

 Bus so it should illuminate the LCD numbers when the battery is 

 switched on.   I need to find a home for wire from the enable pin. 	


    looked all over the data sheet and couldn't

    find a callout for enable pin functionality . . .

    for a Honeywell product, I find that surprising.



    Anywho, I suppose your assertion of active

    pull-down is correct.



 

  	  Quote: 	
		  My planned ignition system is a SureFly on the left and a Slick mag

 on the right.   I'm working on a post for the list for a small can of worms

 I've opened with that system. 	


   Actually, no big deal. Given that you have

   a magneto, let's consider an ignition activity

   detector tie to the Slick p-lead.



   I did a sketch for a reader about a quarter

   century back. I'll see if I can dig it up

   or duplicate it. Probably have all the needed

   parts to dedicate to the cause. Watch

   this space.



 

   



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Apr 23, 2023 9:48 am Post subject: Which Oil Pressure Switch?

At 06:22 AM 4/22/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Mudfly" <shawntedwards(at)hotmail.com>



 [quote="Eric Page"] 	  Mudfly wrote: 	
		  I'm having trouble finding a wire diagram for my unit, but guess the enable pin goes to ground. 	


 Here are the installation instructions for the unit you mentioned.  Wiring data is on the first page.  The enable pin is active high. 	


   very good. thanks!



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Apr 26, 2023 8:59 am Post subject: Which Oil Pressure Switch?

--> AeroElectric-List message posted by: "Mudfly" <shawntedwards(at)hotmail.com>



 [quote="nuckolls.bob(at)aeroelect"]At 07:56 AM 4/21/2023, you wrote:

  [quote]--> AeroElectric-List message posted by: "Mudfly" 



 

   Shawn,



   Could you set this hourmeter up on the bench

   and measure the current draw on the enable

   pin in the pull-up configuration? I think

   I have a simple solution using p-lead

   signal from a mag to drive the enable pin

   but having that current value would facilitate

   optimization of the components.



 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

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

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

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