Re: [foxboro] Easy AIN question

We did several of these at Plant Scherer, and the transmitter sent us 4 ma for 
bottom of scale (which was 70% silo level; we used less accurate weigh cells 
below that) and 20 ma for top.  

If the transmitter sends "empty space" rather than "filled space" signal, you 
could use it the way you suggested, simply scaling in the inverse direction.

> 
> From: "Moore, Kenneth, Celanese/US" <ken.e.moore@xxxxxxxxxxxx>
> Date: 2006/07/12 Wed AM 08:03:36 EDT
> To: <foxboro@xxxxxxxxxxxxx>
> Subject: [foxboro] Easy AIN question
> 
>  I have an application coming up where I would like to use a guided
> radar level transmitter to measure the amount of free space remaining in
> a vessel. Being somewhat of an I/A novice, I thought I'd ask the experts
> before proceeding.=20
> The guides will be 72" long. If I enter the scaling in reverse order, 72
> as low and 0 as high, will the indication be inverted? 4mA=3D72 and
> 20mA=3D0? Thus the read out on the display will be the amount of =
> uncovered
> guide.
> 
> 
> 
> 
> Regards,
> 
> 
> Ken Moore
> Process Controls Specialist
> 
> Celanese=20
> Enoree, SC 29335
> 
> 
> 
> 
> 
> 
>  
>  
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