Buffered_pH_probe

Published:2009/7/24 21:53:00 Author:Jessie | From:SeekIC

Figure 6-15 shows a MAX406 combined with a MAX131 ADC to form a buffered pH probe. This circuit eliminates expensive low-leakage cables that often connect pH probes to meters. The MAX406 and a lithium battery are included in the probe housing. A conventional low-cost cable carries the buffered pH signal to the MAX131. In most cases, the 3-V battery life exceeds the functional life of the probe.Figures 6-16, 6-17, and 6-18 show the offset-voltage adjustment, feedback compensation, and pin configurations, respectively for the MAX406. Notice that the feedback compensation (Fig. 6-17) is not required in all cases. MAXIM NEW RELEASES DATA Book, 1993, P. 3-5, 3-28, 3-29.



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