Support Engineering Group : HRpH Sensors for May 2010 Deployment This page last changed on Jan 18, 2011 by tm. 6 HRpH sensors deployed, 1 flooded. FOCE control can blew a fuse FOCE can reworked with polyfuse (self resetting) and Ed trained on current draw per HRpH (73mA avg) so that a flooded housing could be detected and HRpH shutdown Flooded HRpH replaced FOCE back in the water in June, 1 HRpH flooded, detected and shutdown in the first hour. FOCE recovered 6+ months later for a total of 7 months. The 5 sensors that were powered continuously had minor rust on the stainless 316 fitting, the one that was powered down had no rust. The reference electrodes on the 5 sensors had KCL wafers in place and looked like they could go for many more months. Note: this page needs update with more analysis and details time permitting.

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