User manual FLUKE VLI

[. . . ] DH Instruments makes sincere efforts to the ensure accuracy and quality of its' published materials; however, no warranty, expressed or implied, is provided. DH Instruments disclaims any responsibility or liability for any direct or indirect damages resulting from the use of the information in this manual or products described in it. Mention of any product does not constitute an endorsement by DH Instruments of that product. [. . . ] A VLI is often used when the medium used by a piston gauge is not the same as the medium used by the test. Max working pressure of VLI P/N 100693 is 100 MPa (15 000 psi) 1. 2 OPERATING PRINCIPLE This component interfaces two pressure media in a high pressure chamber. Using two media of different densities allows a natural separation between the two fluids that can be referenced to an indicating pointer in the VLI and viewed through a transparent lens. 1. 3 COMPONENT LOCATION 1. 7. Stand Reference Pointer Upper Pet-cock Overflow Port Upper Pressure Interface Port Lower Interface Port Drain Cock Figure 1. VLI Components Page 1 © 1998 - 2007 DH Instruments, a Fluke Company VLITM OPERATION & MAINTENANCE MANUAL NOTES © 1998 - 2007 DH Instruments, a Fluke Company Page 2 2. INSTALLATION 2. 2. 1 INSTALLATION UNPACKING AND INSPECTION The VLI consists of the following items: Table 1. Visible Level Interface (VLI) DH 1500 Gland (1500 bar, metric thread) DH 1500 Collar (1500 bar) DH 1500 Plug (1500 bar) O-Ring (spare) 4x12 mm Button Head Screw Operation and Maintenance Manual OPTIONAL 1 ea. VLI Stand, High OR VLI Stand, Low PART # 100693 100265 100278 102053 101063 NPN 550039 PART # 100703 100702 2. 2 INITIAL SETUP Place the VLI on the same surface as the piston gauge or other reference to which it is to be connected. Ensure the VLI and the connecting hardware are clean and free of contamination. Connect the VLI to the standard using the connecting hardware supplied. If the piston gauge medium has the greater density, the connection should be made at the lower port of the VLI. If this is not true, then the connection should be made at the middle port. Fill the VLI through the connecting hardware to the tip of the interface level indicator with the fluid that has the highest density. Carefully fill the rest of the VLI with the lighter medium until the air is completely displaced form the VLI. Install the upper pet-cock and tighten hand tight. When interfacing a gas medium with a liquid medium the control of pressure must be performed on the gas side. [. . . ] This condition could lead to outgassing (rapid boiling) when returning to zero. To prevent boiling liquid into the gas or gas into the liquid, decrease pressures slowly to approximately 200 psi (1. 4 MPa). Hold that pressure until outgassing has apparently stopped and then decrease to zero. © 1998 - 2007 DH Instruments, a Fluke Company Page 4 3. [. . . ]