2. PREPARATION FOR OPERATION
Figure 4.
Piston Cap Inspection
Figure 5.
Piston Cap/Bell Testing
2.5.2
CHECKING PISTON STOP BUSHING
Piston-cylinder modules used with AMH must be
equipped with the newer style of piston stop bushing
that is threaded and made of white or cream colored,
static dissipative acetal. Before using a PG7000
piston-cylinder module with AMH, inspect the piston
stop bushing (see Figure 6). Verify that the bushing is
made of the required white or cream-colored material.
Black bushings must be replaced before the piston-
cylinder module is used with AMH. Contact a your DHI
representative or a DHI Authorized Service Provider
for assistance.
To view the piston stop bushing, the piston cap must
be removed. See the PG7000 Operation and
Maintenance Manual; Piston-Cylinder Modules,
Disassembly, Cleaning and Maintenance.
Figure 6.
Piston-Cylinder Module
Piston Stop Bushing
2.6
INSTALLING THE AMH MASS SET
PG7000 AMH masses are shipped in reusable, molded shipping and storage cases. One of the cases
contains the binary masses, binary mass carrier, mass bell and lifting shaft/trim mass tray. The other
cases contain the main masses of 6.2 (AMH-38) or 10 kg (AMH-100) (see PG7000 Operation and
Maintenance Manual, Inspecting Contents, Mass Set for mass set composition detail). Each mass is
packed in a sealed plastic bag and then placed in a protective shipping insert.
The stability over time of PG7000 pressure measurements is a function of the stability of the
masses loaded on the piston. Precautions should be taken in handling the masses to minimize
influences that may change their mass. This includes always wearing protective gloves when handling
the masses to avoid contaminating them with body oils and perspiration. Protective gloves are
provided in the accessory kits of PG7000 Platforms.
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© 2007 DH Instruments, a Fluke Company
