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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Tue 12/26/17: 3
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Today's Message Index:
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     1. 07:20 AM - Re: Re: Engine Sensors to Arduino...  (Robert L. Nuckolls, III)
     2. 11:15 AM - Re: Re: Engine Sensors to Arduino...  (Charlie England)
     3. 06:13 PM - Re: Re: Engine Sensors to Arduino...  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 07:20:40 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Engine Sensors to Arduino...


>>
>>   Bob . . .
>What's the reason for using a degree-K sensor, instead of a degree-F 
>sensor (like the LM34)?

   The DegreeK sensor presents ~2740 mV at room temperature
   and its output says above zero for even the lowest expected
   temperatures. To measure minus temps with a DegreeF device,
   you need a source of negative voltage to bias it up.


   Bob . . . 

________________________________  Message 2  _____________________________________


Time: 11:15:15 AM PST US
From: Charlie England <ceengland7@gmail.com>
Subject: Re: AeroElectric-List: Re: Engine Sensors to Arduino...

On Tue, Dec 26, 2017 at 9:19 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:

>
>   Bob . . .
>
> What's the reason for using a degree-K sensor, instead of a degree-F
> sensor (like the LM34)?
>
>
>   The DegreeK sensor presents ~2740 mV at room temperature
>   and its output says above zero for even the lowest expected
>   temperatures. To measure minus temps with a DegreeF device,
>   you need a source of negative voltage to bias it up.
>
>   Bob . . .
>
Ah, yes. I suspected that; I didn't notice the negative supply requirement
for sub-zero on the LM34 until after I hit 'send'.

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________________________________  Message 3  _____________________________________


Time: 06:13:59 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Engine Sensors to Arduino...


>Ah, yes. I suspected that; I didn't notice the 
>negative supply requirement for sub-zero on the 
>LM34 until after I hit 'send'.=C2

   Not only do you need a negative supply to get
   the device to function, you need an a/d converter
   that resolves negative voltages.

   DegreesK stays in the positi8ve range for all
   temperatures of interest and the rudimentary
   0-5v input range for DAS isn't insulted either.

   I have a half dozen DegreesK sensors left over
   from Beech projects . . . a little chunk of 'stuff'
   soldered to the end of a single, shielded conductor.
   I think the the last time I used these was to monitor
   ambient and motor temperatures on the Beechejet's
   pitch trim system during an investigation into motor
   shaft failures.

   REALLY easy to fabricate and integrate into the
   DAS system.


   Bob . . . 

 

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