Re: [APD] Re: Non-Glass, ISFET sensor miniLab pH meter, ISFET pH Probe

["S. Hieber" <shieber at yahoo_com>]

Note that the isfet probes are not interchangable on other
meters designed for glass/gel filled probes. The non-glass
probes need different electronics receiving the signal.

I don't know if anyone has made a "universal" non-glass
probe.

Scott H.
--- Ken Simolo <Simolo at chem_chem.rochester.edu> wrote:
> I have used the IQ125 for several years now and have been
> extremely 
> happy with it.  Below is what I wrote last Spring.
> 
> Ken
> 
> >Date: Fri, 28 Mar 2003 12:48:28 -0500
> >To: Aquatic-Plants at actwin_com
> >From: Ken Simolo <Simolo at chem_chem.rochester.edu>
> >Subject: Re: PH meters
> >Cc:
> >Bcc:
> >X-Attachments:
> >
> >Hi,
> >
> >I wrote the following 2 years ago and it still holds
> true.  I am 
> >still using the same meter/electrode after 4 years.
> >
> >Ken
> >
> >"I would recommend the silicon chip sensor pH meters.
> They can be 
> >stored dry and the electrodes are good for 10,000 -
> 20,000 readings. 
> >Most of the standard gel pH electrodes (the kind found
> in most of 
> >the small hand-held pH meters) last for 6 months to 1
> year and then 
> >you have to replace the whole meter.  The best
> price/performance 
> >that I have seen are at www.phmeters.com - I have now
> used one of 
> >their's for 18 months with no problems.  They came
> highly 
> >recommended by a salesman who only carries standard hand
> held pH 
> >meters so he was actually losing business by
> recommending them!  The 
> >electrode is stored dry which is a very nice feature. 
> For 
> >measurements, all you need is 1 - 2 drops of liquid. 
> The extra $25 
> >to get the model 125 (if I remember correctly) is worth
> it because 
> >you get 3 point calibration capability among other
> things.  During 
> >the last 18 months, my meter has drifted by only 0.1 pH
> units.  The 
> >only negative is their cost but they pay for themselves
> in just 10 - 
> >15 months as compared to gel electrodes."
> 
> >
> >Message: 10
> >Date: Wed, 26 Nov 2003 18:57:48 -0700
> >From: R S Ahl <rsahl at dimensional_com>
> >Subject: [APD] Non-Glass, ISFET sensor miniLab pH meter.
> >To: "Aquatic-Plants at Actwin_ Com (E-mail)"
> <aquatic-plants at actwin_com>
> >
> >Has any used or tasted this pH pin?
> >miniLabTM pH Series IQ120 & IQ125 Professional
> >
> >
> > 
>
http://www.phmeters.com/IQ120_IQ125_miniLab_pH_meter_spotlight.htm
> >
> >
> >Steve
> >
> >
> >------------------------------
> >
> >Message: 8
> >Date: Mon, 1 Dec 2003 07:48:56 -0500
> >From: "Jim Miller" <jim at jtmiller_com>
> >Subject: [APD] ISFET pH Probe
> >To: "apd" <aquatic-plants at actwin_com>
> >
> >Has anyone tried one of these? Is it as trouble free as
> their site claims?
> >
> >tnx
> >jtm
> >
> >------------------------------
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> Aquatic-Plants at actwin_com
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=====
S. Hieber

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