and ready for operation (operation time at least 8 hours with
a loss in efficiency of less than 5 %).
Replacing the window foil of αβcounter tubes
A spare foil on a frame is standard accessory for this counter
tube. Other foil frames can be provided by the manufacturer.
1. To change the window foil frame, place the hand probe with
the grid facing up on a clean, not too smooth surface (rubber
mat, towel) to secure it against slipping during work.
2. Carefully loosen and remove the 12 Phillips screws on alter-
native sides using the screwdriver (accessory).
3. First, remove the outer frame with the dense mesh screen
and then lift off the square screen frame onto which the foil
is glued (see Figure 7.9). Do not pull the rubber seal ring out
of the groove and do not damage it!
4. Check if all 6 counting wires inside the counter are stretched
tight and show any sign of damage. Otherwise, return the
counter tube to the manufacturer for repair.
5. Inspect the new foil to verify that it is not damaged.
Prevent penetration of dust, lints, small particles, etc. in-
to the open counter tube!
6. Attach the square screen frame with the foil facing down,
then the frame with the mesh screen, reinsert the screws
loosely and tighten them alternatingly (see Figure 7.9),
7. Then place the P10 counter tube for flushing into the refill
station.
While flushing the counter tube, the foil must noticeable bulge
out and stay that way for some time; otherwise it is not tight.
Check and, if necessary, reassemble it again!
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