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'[EE]: TDS or conductivity sensor'
Robert A. LaBudde
|At 05:23 PM 10/12/01 -0700, you wrote:
>I'd like to build a TDS meter using a PIC. Could someone please tell me
>where I can find out some inexpensive conductivity sensors for this project?
>Thanks for your help.
Use two rods of an inert metal a fixed distance apart and drive with a 1000
Hz AC signal (square or sine or triangle). Calibrate using salt water.
Commercial meters use stainless steel electrodes or fancier platinized
Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: lcfltd.comral
Least Cost Formulations, Ltd. URL: http://lcfltd.com/
824 Timberlake Drive Tel: 757-467-0954
Virginia Beach, VA 23464-3239 Fax: 757-467-2947
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Thanks, Robert, for your idea. I'll try it later.
----- Original Message -----
From: "Robert A. LaBudde" <LCFLTD.COM> ral
To: <MITVMA.MIT.EDU> PICLIST
Sent: Saturday, October 13, 2001 8:08 PM
Subject: Re: [EE]: TDS or conductivity sensor
> At 05:23 PM 10/12/01 -0700, you wrote:
> >I'd like to build a TDS meter using a PIC. Could someone please tell me
> >where I can find out some inexpensive conductivity sensors for this
> >Thanks for your help.
> Use two rods of an inert metal a fixed distance apart and drive with a
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