The P1 is for conventional pH with one pH glass bulb and one reference junction. P2 is for differential pH measurements with two pH glass bulbs. The pin layout on the variopin is different, therefore there are two different types of SA11.
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Digital SMART SENCOM™ Adapter, SA11
Reusable SMART adapter, requiring only the analog sensor to be disposed of when it reaches the end of its lifetime. With the SENCOM 4.0 platform, Yokogawa delivers reduced costs and waste while contributing to its long-term business goals of a sustainable future for all.