DH Instruments PG7607, Руководство по эксплуатации и обслуживанию

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PG7607™ OPERATION AND MAINTENANCE MANUAL
© 2008 DH Instruments, a Fluke Company Page 12
4.2 CLEANING PISTON-CYLINDERS
The piston-cylinder cleaning methods described in the PG7000 Operation and Maintenance Manual
should be used with the following exceptions/comments:
•
Water/detergent method: Due to the piston-cylinder’s large diameter and very small annular gap, it
is very difficult to insert the piston into the cylinder when the piston is not installed on the PG7607
mounting post. Without the alignment mechanism provided by the mounting post arrangement (see
Figure 1) there is a substantial risk of cocking the cylinder on the piston. When using the
water/detergent method to clean a PG7607 piston-cylinder, wash the cylinder and the piston
separately and do not attempt to put the piston into the cylinder until the piston is installed on the
PG7607 platform mounting post.
•
Quick method: As it is difficult to hold the piston without making contact with its critical working
surface, install the piston onto the PG7607 platform mounting post to clean it (see Section 2.2.2).
4.3 PISTON-CYLINDER RECALIBRATION
4.3.1 MASS OF THE CYLINDER
The floating assembly of the PG7607 cylinder includes (see Figure 1):
•
The cylinder and cap (4, 1).
•
The cylinder cap screw (2).
•
The adjustment mass (17).
•
The cylinder cap O-ring (3).
•
The cylinder stroke limiter (16).
To determine the mass of the floating cylinder assembly, the mass of all these parts must
be determined. The cylinder stroke limiter (16) is captivated in the piston retaining assembly
(5) and the retaining assembly must be disassembled to remove it. See Section 4.4 for
disassembly instructions for the piston retaining assembly.
4.4 DISASSEMBLY OF PISTON RETAINING ASSEMBLY
The piston retaining assembly (see Figure 2) does not need to be disassembled as part of
routine maintenance. However, the piston retaining assembly captivates the cylinder stroke limiter that is
part of the of cylinder assembly whose mass must be determined when recalibrating the cylinder.