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. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of Fluke Calibration, 4765 East Beautiful Lane, Phoenix, Arizona 85044-5318 USA. [. . . ] The piston and the cylinder are separate; each is packed in its own bullet case. Use a tee to connect the TEST port and the CCP port together. 2. 2. 2 Installing and Removing the Piston-Cylinder Assembly Note Unlike other PG7000 models, the PG7607 piston-cylinder and mounting elements are not an integrated module. The piston and cylinder are delivered and installed as separate parts. Caution Given the large diameter and small annular gap of the PG7607 pistoncylinders, it is very difficult to insert the piston into the cylinder without the aid of the alignment mechanism provided by the PG7607 platform mounting post and piston retaining assembly. It is not recommended that the piston ever be put into the cylinder when the piston is not installed on the PG7607 mounting post. To operate the PG7607 platform, a piston-cylinder must be installed on its mounting post. To install a piston-cylinder assembly on the PG7607 platform, follow the sequential procedure below. This procedure may be used on the first and subsequent piston-cylinder installations; it may also be used in reverse order to remove a piston-cylinder. Numerical references in the procedure refer to Figure 1. Page 5 © 2010 Fluke Calibration PG7607TM OPERATION AND MAINTENANCE MANUAL Remove the piston retaining assembly (5). The PG7607 platform is delivered with the piston retaining assembly (5) installed in the mounting post (7). Holding the piston retaining assembly by the knurled surface (14), unscrew it (rotate CCW) fully from the mounting post and remove it. Avoid touching the WHITE cylinder centering ring (15) as it will eventually contact the critical inside surface of the cylinder. 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. 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). 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. 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. 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. [. . . ] MAINTENANCE, ADJUSTMENTS AND CALIBRATION 4. 4. 1 Disassembly Procedure To remove the cylinder stroke limiter from the piston retaining assembly follow the procedure below. Numerical references in this procedure refer to Figure 2. (See Section 4. 1, Figure 1 for this step. ) With the piston NOT installed, install the piston retaining assembly (5) onto the mounting post (7). Using circlip pliers, remove the spring retaining circlip (1) from the top of the assembly. As the circlip is removed, the spring washer (2) will lift slightly as the springs (3, 5) decompress. Gently lift out the spring carrier (4) along with the four high stop springs (3) it carries. [. . . ]