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Re: [APD] CO2 and pH control

Usual single point calibration is to 7.0, not 7.2.  Dual point calibration
is usually to 7.0 and either 4.0 or 10.0.

First I've heard of calibrating to 7.2... maybe this could be part of the


-----Original Message-----
From: Gordon and Susan Watkins [mailto:gwatkins at ritternet_com] 
Sent: 13 December 2005 22:38
To: aquatic plants digest
Subject: Re: [APD] CO2 and pH control


    The SMS122 controller is new and I calibrated it to 7.2 upon setup a 
week or so ago. The reading correlates with chemical pH tests so I'm 
confident in its accuracy.


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