User manual DHI INSTALLATION AND USE OF LOW-FLOW VACUUM PUMP KIT FOR MOLBLOC-S PN 401982

[. . . ] Installation and Use of Low-Flow Vacuum Pump Kit for molbloc-S® P/N 401982 Instruction Sheet The use of a vacuum pump, connected downstream of the molbloc-S®, increases the usable flow range of each element. The installation and operation of the vacuum should be in accordance with all applicable local electrical, plumbing, building, and safety codes. [. . . ] Unscrew the safety collar and insert the cord through the safety collar and into the terminal box. Locate terminal one and attach the blue wire (neutral) to it. Locate terminal two and attach the brown wire (line) to it. Locate the earth ground terminal off to · Figure 2: Wiring the Leybold SV25B Vacuum Pump VACUUM PUMP INSTALLATION, GENERAL CONSIDERATIONS · The vacuum pump should be located in a place where there is adequate ventilation for cooling. Consideration of the noise and heat generated by the pump should be made. It might be desirable to install the pump in a location outside of the laboratory in which the molbloc/molbox system is operating. Caution should be exercised when calibrating in gases other than air. Asphyxiation of personnel within a confined space into which the pump exhausts is a real threat when calibrating at high flow rates. Venting of the exhaust gas stream outdoors or into a large ventilated space is recommended. · In order to minimize the back-pressure applied to the exhaust of the pump, plumbing should be as short and as large in diameter as is practical, but no smaller than the pump's exhaust fitting size. Inlet plumbing length and diameter should follow the same guidelines in order to maximize the efficiency of the vacuum pump. Restrictions in the inlet plumbing will reduce the pumping speed of the pump. In cyclic operations, such as flow meter calibrations with molbloc-S, the pump should not be switched off during cycles. [. . . ] This system should be assembled and operated only by personnel who have been instructed in proper safety practices. molbloc-S is a registered trademark of DH Instruments, Inc. Document 560064B 040331 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 [. . . ]