User manual DHI PG7607

[. . . ] PG7607 Piston Gauge Operation and Maintenance Manual (Use with PG7000 Operation and Maintenance Manual) © 2010 Fluke Calibration Warning High pressure liquids and gases are potentially hazardous. Energy stored in these liquids and gases can be released unexpectedly and with extreme force. High pressure systems should be assembled and operated only by personnel who have been instructed in proper safety practices. © 2010 Fluke Calibration All rights reserved. Information in this document is subject to change without notice. [. . . ] The PG7607 platform is delivered with the lower and upper piston sealing O-rings (10a, 10b) and O-ring carriers installed loosely in the recess on the mounting post. Remove the upper O-ring and Oring carrier (10b) and retain. Check that the lower O-ring and O-ring carrier (10a) are present and properly seated. (If needed two spare o-rings are included in the PG7607 platform accessory kit). Remove the piston (6) from its packing. Using lint free gloves or wipes to avoid direct contact with the piston critical surface (polished appearance) remove the piston (6) from its packing. Caution Never handle the piston or cylinder with bare hands. Oil and acids from bare skin can damage the critical surfaces (polished appearance). The cylinder is part of the mass load and contamination can change its mass. Install the piston (6) on the mounting post (7). With the end of the piston etched with "X" and/or the serial number UP (11) so that it will enter the cylinder first, slip the piston over the mounting post and slide it down until it seats on O-ring (10a. ) Check that the end of the piston facing UP has "X" and/or the serial number marked on it. Install the piston retaining assembly (5). Place the upper O-ring and carrier (10a) centered on the top surface of the piston. Hold the piston retaining assembly (5) by the knurled ring (14); avoid touching the white cylinder centering ring (15) as it will eventually contact the critical inside surface of the cylinder. Thread the piston retaining assembly into the top of the mounting post (7) and screw it down carefully assuring that upper O-ring carrier (10a) is not pinched. The assembly's shoulder (13) should meet the top of the piston (11) with no gap between the two surfaces. There will be some resistance from the mounting post O-ring (12), only hand tightening is needed. Do not use tools to install the piston retaining assembly. Tighten lightly by hand until the assembly reaches the end of the engagement threads and surfaces (13) and (11) meet. Clean the piston (6) and the cylinder centering ring (15), consider cleaning the cylinder (4). Using the glass cleaner method described in Section 4. 2, clean the piston (6) and the cylinder centering ring (15). If this is the first piston-cylinder installation, also clean the cylinder (4). On subsequent installations consider cleaning the cylinder before installing it. [. . . ] It is preferable to avoid contacting this part with bare hands. Spring Retaining Circlip Spring Washer (4) HighStop Springs Spring Carrier (4) LowStop Springs Cylinder Stroke Limiter Piston Retaining Nut Upper Piston Sealing O-ring (Brown, Viton, 2-029) Mounting Post O-ring (Brown, Viton, 2-019) Figure 2. Piston Retainer Assembly Page 13 © 2010 Fluke Calibration PG7607TM OPERATION AND MAINTENANCE MANUAL 4. 4. 2 Reassembly Procedure To reassemble the cylinder stroke limiter into the piston retaining assembly, follow the procedure below. Numerical references in this procedure refer to Figure 2. Remove the piston retaining nut (7) from the mounting post and set aside. [. . . ]