REFLECTOR: optical low fuel sensor

[Craig and/or Denise Woolston]

Most likely, one wire is common, one is for normally open and the other for
normally closed.  Your going to have to put an Ohm meter on it to find which
one is which and/or colors are different.

Normally open means when the switch is made the circuit is open.  And so if
the switch is NOT made then a circuit would be completed b/t the common wire
and the "normally open" wire.  This is mostly likely the wire you need for
your installation.  If there is no fluid in the tank, the switch will open,
complete the circuit and your light will come on.

Normally close means when the switch is made the circuit is completed b/t
the common wire and the "normally closed" wire.

Craig
XL-5FG

 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Dean May
Sent: Thursday, June 22, 2006 2:32 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: optical low fuel sensor

Ok I purchased this optical level sensor, but now how do I wire it in?  The 
old mechanical sensor had two wires and this has three. Any ideas?

Dean May
N474MA   STDRG
----- Original Message ----- 
From: "Brian Michalk" <michalk at awpi.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Thursday, June 15, 2006 10:49 PM
Subject: Re: REFLECTOR: optical low fuel sensor


McMaster-Carr, 4949K43, $79.65
http://www.mcmaster.com/catalog/112/gfx/large/4949kp1l.gif

Control the liquid level in your tank without a float-an infrared light
beam does all the work. When the tip is immersed (or exposed), the beam
refracts (or stops refracting) and activates the sensor output. Sensors
have an LED signal to indicate when output is on. Sensors are sensitive
to light, so they need to be shielded or used in an enclosed tank.
Maximum output is at the input voltage. Polyamid housing is best for use
with solvents, polysulfone housing will stand up to most acids and
bases, and carbon steel housing is the choice for high-pressure
applications. Output when wet sensors activate when the tip is immersed;
use to empty a tank. Output when dry sensors activate when there is no
liquid present; use to fill a tank.


Check out
http://www.tvbf.org/gallery/index.php?dir=Sump%20Tank%20-%20FG%2F
I've got three pictures at the end of my installation.

I tried testing it in a foam cup.  It didn't work.  I think the signal
was bouncing around the cup and re-entering.  It worked just fine at
engine start.  I'm not yet flying.



Robin Wesley Ream wrote:
> Do you have an installation picture of this on-line somewhere?
> Robin
>
> ----- Original Message ----- From: "michalk" <michalk at awpi.com>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Thursday, June 15, 2006 10:44 AM
> Subject: Re: REFLECTOR: optical low fuel sensor
>
>
>> I bought mine from McMaster Carr.  It's cheaper than the Gems sensors. 
>> I'll try to remember the model number.
>>
>> The float type didn't work.  I ended up drilling it out because it 
>> wouldn't come out.  I then inserted a brass bushing in it's place and 
>> installed this new optical sensor.
>>
>> Dr. Golf wrote:
>>
>>> Does anyone know the supplier and part number for the
>>> optical sensor?
>>> Joel
>>>
>>>
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