User manual
Poseidon MKVI User Manual
Chapter 4
Page 65
Electronics should be stored in a clean, dry environment, with the battery and oxygen sensors
removed and stored separately. The battery should be recharged periodically, as described in
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 MKVI 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
break down 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 troubleshooting 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 consis-
tently 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.)
Included with the Poseidon MKVI is the Oxygen Sensor Removal tool (Figure 4-1). This tool is
specially designed to remove oxygen sensors from the electronics module. As shown in Figure
4-1, the tool is held with the forenger and middle nger through two large holes on either side
of the plunger, with the thumb on the plunger button (similar to holding a syringe).
With the splayed ange of the tool lined up with the hole of the oxygen sensor base, snap the
tool into the sensor base as shown in Figure 4.2.It’s important to note that the tool locks into
the oxygen sensor base when plunger button is pressed. Therefore, do NOT attempt to insert
or remove the tool from the oxygen sensor base while the button is pressed.
Figure 4-1.
Oxygen sensor removal tool.
Figure 4-2.
Removal tool snapped into sensor base.
Do NOT press button when
snapped into base
Figure 4-3.
Press button to lock tool onto sensor base.
Hold the button and pull the oxygen sensor
base out of the electronics module
Figure 4-4.
Pull the sensor out while pressing button.
Primary oxygen sensor
Secondary oxygen sensor
Oxygen sensor removal tool