---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 04/17/23: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:15 AM - Re: Which Oil Pressure Switch? (Mudfly) 2. 01:16 PM - Re: Re: Which Oil Pressure Switch? (Neal George) 3. 01:18 PM - Re: Re: Which Oil Pressure Switch? (Ken Ryan) 4. 01:29 PM - Re: Re: Which Oil Pressure Switch? (Charlie England) ________________________________ Message 1 _____________________________________ Time: 07:15:23 AM PST US Subject: AeroElectric-List: Re: Which Oil Pressure Switch? From: "Mudfly" 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 ________________________________ Message 2 _____________________________________ Time: 01:16:16 PM PST US From: Neal George Subject: Re: AeroElectric-List: Re: 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 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 ________________________________ Message 3 _____________________________________ Time: 01:18:42 PM PST US From: Ken Ryan Subject: Re: AeroElectric-List: Re: 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=AFAM Mudfly wrote: > shawntedwards@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-producti vity-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 pressur e, > but it does not activate until 27 mph. Don't love that either:) > > https://www.edmo.com/product/AEROMETER/hourmeter-airspeed-switch-stc-aero meter > Any ideas from the group? > Shawn > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=510642#510642 > > =========== =========== =========== =========== =========== > > ________________________________ Message 4 _____________________________________ Time: 01:29:29 PM PST US Subject: Re: AeroElectric-List: Re: Which Oil Pressure Switch? From: Charlie England On 4/17/2023 3:15 PM, Neal George wrote: > > 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 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. -- This email has been checked for viruses by Avast antivirus software. www.avast.com ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.