Poseidon SE7EN+ User Manual Chapter 4 Page 67
Chapter 1. Keep in mind that oxygen sensors may need to be replaced if the rebreather is
stored for extended periods.
First-stage regulators should receive annual servicing, as needed. The open-circuit regulator
built into the mouthpiece of the Poseidon SE7EN+ should be serviced by a qualied Poseidon
Service Center prior to diving after an extended period of storage
Before storing the rebreather for extended periods, it’s good practice to lubricate the user-
accessible o-rings, to minimize the affects of aging and extended drying.
If long-term storage is expected to extend for several months or more, it is good practice to
disassemble the cylinders and rebreather for storage in the provided case, as described below.
Replacing oxygen sensors
If the automated Pre-Dive routine consistently fails on
test 53 (oxygen sensor calibration), one or both of the
oxygen sensors needs to be replaced. The troubleshoot-
ing guide table in Appendix 1 lists all of the error codes
for Test 53. If the test fails consistently with Error Code
67, 68, 72, 73, or 76, the Primary oxygen sensor needs
to be replaced. If the test fails consistently with Error
Code 69, 70, 74, or 75, the Secondary oxygen sensor
needs to be replaced. (Note: Error Codes 66 and 71 of
Test 53 are likely due to incorrect diluent or oxygen
mixtures, but may suggest the need to replace both
oxygen sensors.)
Primary oxygen sensor
Secondary oxygen sensor
Figure 4-2.
Galvanic O2 sensor removal.
Figure 4-1.
Oxygen sensor removal.
Figure 4-3.
Solid States O2 sensor removal.
Digital sensor
connector
Analog sensor
connector
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