Bird Technologies 8320 - Manual (Page 24)

5. Now release and remove the clamping band by
loosening the 10-32 screw on its clamping block.
6. Remove the domed end cover assembly, P/N
8325-015, which has a special seal busing ring,
P/N 2430-089, sealing the attenuator output
housing. Be careful when disassembling not to
damage either this sealing ring which is fitted on
the coolant cylinder housing or the O-Ring, P/N
5-243, on the RF output section. The interior of
the radiator and the RF section assembly are
now exposed to view.
Coolant Level
CAUTION
Do not overfill the radiator tank with coolant. Room
must be allowed for expansion of the heated coolant.
Models 8321,
8322 and
8323
The level of the dielectric coolant, P/N 5-030, should remain
constant in the unit even after prolonged usage under nor-
mal operating conditions. As shipped, the coolant is at a fac-
tory determined level, and should be about 7/8 inch (22.2
mm) below the face of the output end, with the unit in a ver-
tical position. The coolant should just cover the upper sur-
face of the cubical center block of the RF section assembly.
However, loss of up to 10 percent of the full tank capacity
should not impair the operating efficiency of the attenuator.
The coolant should be a clear light yellow color. If not, it is
contaminated and should be replaced. Inspect occasionally
around the clamping bands at the input and output ends for
possible coolant leakage. If necessary, tighten the clamping
screw and make certain the diaphragm and output housing
seals are in good condition; i.e., soft, pliable and free from
surface cracks.
Add Coolant Add coolant directly into the radiator tank unit it reaches
the proper level.
Replace
Coolant
To replace all of the coolant, use the following procedure:
1. Pick up the attenuator and carefully pour out the
coolant into a suitable container. Allow as much
to drip out as possible.
2. Replace the coolant with fresh coolant, filling the
radiator tank to the proper level.
Model 8325 The level of the dielectric coolant oil, P/N 5-030, should re-
main constant in the unit, even after prolonged usage under
Bird Model 8320S Tenuline Attenuator
14