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
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| Subject: | 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
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| Subject: | 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
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| Subject: | 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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