Owner`s manual

O ptima FX Owner’s Manual

Ch. 2 Pg. 7

Earlier editions of the O2ptima may have a different color or type of magnetic housing cover.

The seat poppet is a non-replaceable item, if the solenoid begins to allow oxygen past the seat,

the entire solenoid should be replaced.

Optima Solenoid

WARNING DISASSEMBLING THE SOLENOID WILL CAUSE DAMAGE TO THE

SOLENOID AND WILL VOID ANY IMPLIED OR STATED WARRANTIES.

The Dive Rite O2ptima has an oxygen safe solenoid in the head of

the unit which is controlled by the primary Juergensen handset to

inject oxygen into the breathing loop. The solenoid can be

identified by tracing the yellow power wire from the sensor block

in the head to the black cap covering the magnetic housing of the

solenoid. Under the black cap the solenoid has three main pieces;

the solenoid base, plunger assembly, and the magnet housing.

The solenoid base is a machined piece of stainless steel which the

oxygen inlet port, outlet port and magnet housing all attach. The

solenoid base also has the knife edge for the plunger to seal against

machined into the top.

The plunger assembly is a piece of ferrous steel which has been

machined to accept a return spring and a seat poppet . When the

solenoid is energized the magnet in the housing draws the ferrous plunger to the top of the

solenoid. Once the current is removed, the attached spring returns the plunger to its original

position against the knife edge creating a seal.

The magnetic housing is a steel tube holding the electromagnet for the solenoid. This housing

should be checked any time the cartridge is replaced in the unit. Due to the nature of ferrous steel

in a high humidity and oxygen enriched environment, the housing should have a light film of

oxygen compatible grease to help retard the formation of corrosion. The magnetic housing must

be made of ferrous steel due to being used in the magnetic circuit for the solenoid.