User manual DHI INSTALLATION AND USE OF 14 IN. BACK PRESSURE REGULATOR KIT PN 402075

[. . . ] High pressure gases are potentially hazardous. Energy stored in these 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. Using a pair of properly sized wrenches remove the VCR x tube adaptor (1) which is on the inlet end of the molstic-S. This will leave a VCR coupler (3) as the molstic interface. [. . . ] molstic-S, with Back Pressure Regulator PREPARING THE REGULATOR FOR INSTALLATION Place a new VCR® gasket (P/N 102183) into the outlet port of the regulator. Thread the included VCR male union (2) into the regulator outlet port and tighten finger-tight. Over-tightening VCR connections will damage the sealing beads and possibly cause system leakage. Do not re-use metallic VCR gaskets. Hold the regulator stationary, and tighten the male VCR union 1/8 turn past finger-tight. Attach the regulator mounting bracket to the base of the regulator using the two included #10-32 socket head cap screws, #10 flat washers, and the #10 lock washers. The long side of the bracket should be perpendicular to the direction of flow through the regulator. Figure 2. molstic-S Nut Plate Place the flat side of the 60 mm nut plate (Fig 2, 1) under the molstic-S platform. Align it with the holes in the platform and the regulator bracket. Thread the two M4 socket head cap screws and M4 flat washers through the regulator bracket and tighten them securely into the nut plate. Place a new VCR® gasket (P/N 101183) inside the gauge port of the regulator. This port is marked "IN" on the regulator body and is perpendicular to the axis of flow of the regulator. Install the included gauge and hold in place while tightening 1/8 turn past finger-tight. SYSTEM PRESSURIZATION AND REGULATOR ADJUSTMENT During system operation, be extremely careful not to apply pressure in excess of the maximum operating pressure of the molbox: 600 kPaa (87 psia) for molbox1-A700K, 250 kPaa (36 psia) for molbox1-A350K. Once the test system with molbloc-S and molstic-S has been completely interconnected, the following procedure should be used for its safe pressurization and operation. The pressure directly upstream of a back pressure regulator is controlled by adjusting the position of the control knob. Rotating the knob in the clockwise direction raises the upstream (control) pressure. Counterclockwise rotation, coupled with venting of the downstream side of the regulator plumbing, lowers the upstream pressure. molstic-S regulators are NOT self-venting therefore the upstream pressure will not be adjusted with rotation of the control knob unless the downstream gas is allowed to escape. Make final adjustments of control pressure in the direction of increasing pressure in order to obtain the most accurate and stable set point. through. All that is necessary is a small flow to allow the regulator to be adjusted. Adjusting back pressure: Rotate the back pressure regulator adjustment knob clockwise in order to raise the pressure level upstream of the regulator. Rotate the back pressure regulator adjustment knob counterclockwise in order to lower the pressure level upstream of the regulator. Locking the Back Adjustment (Optional) Pressure Regulator Once the Back Pressure Regulator has been adjusted to the desired level of upstream pressure, the adjustment knob can be locked down in order to prevent future adjustment if desired. [. . . ] The following parts are included in the shipment: DESCRIPTION Regulator, back pressure Regulator bracket Gasket, 4VCR Union, 4VCR male SHC screw, #10-32 x 3/8 Split lock washer, #10 Flat washer, #10 SHC screw, M4 x 12 Flat washer, M4 Nut plate, 60 mm Gauge, pressure QTY 1 1 5 1 2 2 2 2 2 1 1 PART NO. 103526 123657 102183 103231 103277-Z 103021-Z 103278-Z 101016-Z 100918-Z 123621 103528 Back Pressure Regulator Adjustment Begin with pressure at minimum: Rotate the back pressure regulator's adjustment knob counterclockwise until the spring force has been relieved. Open molstic-S flow control/shut-off valve(s): Valves must be open to allow test gas to flow through the system. Open the DUT's flow control valve: If the test system contains a DUT that has flow control capability, it must be opened slightly in order to allow pressure to pass molbloc, molbloc-S, molbox, molstic and molstic-s are trademarks, registered and otherwise, of DH Instruments, Inc. [. . . ]