User manual DHI RECOMMENDATIONS FOR MOLBLOC-S INSTALLATION

[. . . ] Recommendations for molbloc-S® Installation Instruction Sheet The molbloc-S is a high precision metrological instrument whose stability over time is a key component in the performance of the molbloc/molboxTM mass flow calibration system. molbloc-S, like any high accuracy standard, should be handled, operated, and stored with care. Use the following guidelines whenever installing and using the molbloc-S. Making and Breaking Procedure for molbloc-S VCR Face Seal Connection AVOID PARTICULATE AND MOISTURE CONTAMINATION Particulate and moisture contamination must be avoided. [. . . ] To break the fitting, hold the molbloc-S with your hand and loosen the nut until it is completely backed off. Never use wrenches to hold the molbloc-S body. MOLBLOC-S CONNECTIONS The molbloc-S elements designated 5E1-S through 2E3-S have VCR face seal inlet connections and ISOKF Style vacuum flange outlet connections. The 5E3S and 1E4-S molbloc-S elements utilize ISO-KF Style vacuum flanges for both the inlet and outlet. See the relevant sections for further details. CONNECTING, DISCONNECTING AND MOUNTING MOLBLOC-S WITH VCR® FACE SEAL FITTINGS In making the molbloc-S flow connections, always use soft O-rings. They allow a leak free connection to be accomplished with minimal torque, and they provide a source of flexibility between the molbloc-S and elements to which it is connected, protecting the molbloc-S from mounting stresses. Use the following O-ring seals for making molbloc-S VCR® connections: VCR FACE SEAL SIZE PART NO. DHI PARKER SEAL GROUP, O-RING DIV CONNECTING, DISCONNECTING AND MOUNTING MOLBLOC-S WITH ISO-KF STYLE VACUUM FLANGES The ISO-KF Style vacuum flange fitting utilizes an internal centering ring and an external overpressure ring clamp. The seal is affected by the uniform application of pressure by the clamp on the 15° surface of the mating stainless steel flanges. These mating flange surfaces compress a Viton O-ring that is held in place by the centering ring. The overpressure ring keeps the O-ring in place, and maintains a leak free connection when the system is subjected to internal pressures above vacuum level. This connection is reusable, rotatable, and can operate leak free in vacuum applications up to 10-8 Torr, and in positive pressures of 700 kPa (100 psig). MOLBLOC-S DESIGNATOR COMPOSITION 5E1-S and 1E2-S 2E2-S thru 2E3-S 5E3-S and 1E4-S 1/4 in. 102070 2-202 Fluorocarbon rubber (FKM), ® Viton Fluorocarbon rubber (FKM), ® Viton n/a 1/2 in. n/a 102912 n/a 2-207 n/a When performing a leak test of a plumbing system that contains the ISO-KF Style Vacuum Flanges, do not exceed the maximum operating pressure of the molbox: 600 kPa (87 psia) for molbox A700k models or 250 kPa (36 psia) for molbox A350K models! ACCESSORIES INCLUDED WITH MOLBLOC-S SHIPMENT One of the following accessory kits is included in the molbloc-S shipment: P/N 401953 molbloc-S, Sizes 1E2 and Smaller DESCRIPTION QTY PART NO. Making and Breaking Procedure for molbloc-S ISO-KF Vacuum Flange Connection 1/4 in. VCR Face Seal O-Ring 16 mm ISO-KF Centering Ring 16 mm ISO-KF Over-Pressure Ring 16 mm ISO-KF Clamp 16 mm ISO-KF Blanking Cap 2 1 1 1 1 102070 101544 103240 102975 103238 P/N 401954 molbloc-S, Sizes 2E2 through 2E3 DESCRIPTION QTY PART NO. 1/2 in. VCR Face Seal O-Ring 16 mm ISO-KF Centering Ring 16 mm ISO-KF Over-Pressure Ring 16 mm ISO-KF Clamp 2 1 1 1 1 102912 101544 103240 102975 103238 Place the overpressure ring past one of the ISO-KF flanges to be mated. Place the centering ring into the groove of the ISO-KF flange on the outlet of the molbloc-S. Align the mating flange against molbloc's ISO-KF flange, and close the gap by hand. [. . . ] Swagelok is a registered trademark of the Swagelok Company. Viton is a registered trademarks of DuPont deNemours Company. Document 560050a 030502 DH Instruments, Inc. 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA Tel 602. 431. 9100 Fax 602. 431. 9559 dhi@dhinstruments. com www. dhinstruments. com [. . . ]