User manual DHI INSTALLATION AND USE OF 12 IN. BACK PRESSURE REGULATOR KIT PN 402013

[. . . ] 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. 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 VCR gaskets used in this connection are for one-time use and should therefore be discarded. Place a new VCR gasket (P/N 102923) securely against the sealing surface inside the female VCR swivel nut of the regulator's inlet port (2). Figure 2. molstic-S Nut Plate 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 102183) 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 into the port and hold in place while tightening the VCR nut 1/8 turn part finger-tight. Over-tightening VCR connections will damage the sealing beads and possibly cause system leakage. Do not re-use metallic VCR gaskets. Install the adaptor retained from step into the inlet port of the regulator. Using a backup wrench hold the swivel nut stationary, and tighten the adaptor 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. 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 Pressure Regulator Adjustment (Optional) 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. Remove regulator knob cover: Use a small flat screwdriver to remove the plastic cap on the top of the regulator adjustment knob. Remove the top jam nut: Using the properly sized socket wrench, loosen and remove the jam nut located on top of the adjustment knob. Remove the adjustment knob: Rotate the regulator adjustment knob counterclockwise to remove it from the regulator. Tighten bottom jam nut: Rotate the bottom jam nut clockwise until it gently bottoms out against the regulator body. [. . . ] 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 through. All that is necessary is a small flow to allow the regulator to be adjusted. molbloc, molbloc-S, molbox, molstic and molstic-s are trademarks, registered and otherwise, of DH Instruments, Inc. [. . . ]