13
FILLING SENSOR HOUSING WITH FLUID
Do not operate the magnetomete
r until the sensor housing has been filled with charcoal lighter fluid (or lighter
fluid). The unit was shipped without fluid, which must be purchased locally (approximately 1
1/2
quarts of fluid
= 1.4 L). If the fluid is in a metal can (plastic container is ideal) then use a coffee filter to filter any possible
bits of metal out of the fluid before pouring it in the sensor housing.
The following procedure is best performed by two people:
1. Remove the nose cone by removing the 3 screws. Note that the top screw hole in the cone is marked for
proper alignment later; if it is not marked, then mark it.
2. Stand the unit upright with the faceplate end resting on a piece of wood (2x4 works) on the floor. Careful
that the knobs are not hilling the wood or the floor.
3. Using a 15/16" wrench, remove the 5/8” fill hole plug (do not lose the o-ring under the head of the bolts).
4. Using a 9/16" wrench, remove the 3/8" black aluminum vent plug (do not lose the o-ring under the head of
the bolts).
5. Wear safety glasses.
6. Using a small funnel, Slowly pour the charcoal lighter fluid into the center fill hole in the housing. The second
hole is a vent so the air can come out as you are pouring in the fluid. The sensor chamber will hold about
1 1/2 quarts (1.4 L).
7. When the chamber is full, insert the plugs back into the holes finger tight. Shake the mag slightly to get
any trapped air to the top of the chamber (you can hear the fluid sloshing around indicating there is air trapped
inside.) Remove the plugs and refill leaving a small amount (1 oz or so) of air to allow for fluid expansion.
8. Insert the plugs back into the holes.
Careful not to cross-thread (will damage the threads). Do not over
tighten
, just snug will do (once o-ring makes contact, a 1/4 turn will seal the housing. Use a paper towel
to clean up any left over fluid around the bolt heads.
9. Reinstall the fish nose cone.
Diver Mag 1 - Nose End View
Funnel
Charcoal Lighter Fluid.......or........Lighter Fluid
Insert small funnel
in fill hole and fill
with charcoal lighter fluid
Vent hole plug
