User manual FLUKE MOLSTIC-S

[. . . ] molstic-STM Engineered Mounting Systems for molbloc-S® Mass Flow Elements Operation and Maintenance Manual © 2004-2007 DH Instruments, a Fluke Company Do not exceed the maximum operating pressure of the molbox: 600 kPaa (87 psia) for molbox A700K; 250 kPaa (36 psia) for molbox A350K. 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. © 2004-2007 DH Instruments, a Fluke Company All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of DH Instruments, a Fluke Company 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA. [. . . ] The pressure must be regulated and stable within the limits of the molbloc-S calibration pressure range, and low enough to avoid over-pressurization of the molbox. The pressure must not exceed the maximum operating pressure rating of the RPTs in the molbox. See the back panel label of the molbox to determine the maximum operating pressure allowed. Verification of the pressure rating should be obtained by examination of the calibration range on the molbox certification of calibration. · · © 2004-2007 DH Instruments, a Fluke Company Page 20 2. INSTALLATION 2. 4. 1. 1 MOLSTIC-S USE WITH DHI SUPPLIED REGULATORS The inlet gas supply to the molstic-S must be suitably regulated prior to connection to the inlet of the molbloc-S plumbing. The molstic-S is available with the proper pressure reducing regulator integrated, or it can be added in the field using the optional regulator upgrade kits that are available in 1/4 in. molstic-S with Supplied Regulator DHI also offers the supply only platform that includes the regulator with a quick connect inlet, and a shut-off/metering valve on the outlet. molstic-S, and allow additional flexibility in the plumbing location of the DUT. The regulators supplied by DHI were chosen for their superior performance and compatibility with the molbloc-S operation methods. Figure 17. molstic-S with Supply Only Platform Page 21 © 2004-2007 DH Instruments, a Fluke Company MOLSTIC-STM OPERATION AND MAINTENANCE MANUAL Set regulator outlet pressure to minimum: Rotate the knob of the pressure reducing regulator in the counterclockwise direction until the spring force of the diaphragm is relieved. Be sure that the molstic-S Supply Assembly or molstic-S shut-off valve(s) is closed before connecting the quick connector stem to the quick connector body (located on the regulator's inlet). Connect the gas supply: Connect the gas supply to the quick connector stem (1/4 in. Insert the stem into the quick connect body. 2. 4. 1. 2 MOLSTIC-S USE WITH REGULATORS NOT SUPPLIED BY DHI The inlet gas supply to the molstic-S must be suitably regulated prior to connection to the inlet of the molbloc-S plumbing. In addition, a shut-off valve should be used downstream of the regulator in order to allow for system leak testing. The pressure reducing regulators supplied by DHI are selected for the following characteristics: · · · · · · · High quality High sensitivity and stability Outlet (control) pressure range: 0 to 100 psig Non-venting ­ does not relieve control pressure outside of plumbing Low droop (change in control pressure with change in flow rate) Low inlet pressure effect (change in control for a given change in supply pressure) Flow capacity ­ capability to flow to maximum required flow rate Set regulator outlet pressure to minimum: Rotate the knob of the user supplied pressure reducing regulator in the counterclockwise direction until the spring force of the diaphragm is relieved. Connect the gas supply: Connect the gas supply to the pressure regulator's inlet port using suitable means and compatible fittings. The gas supply pressure should not exceed the regulator's maximum operating pressure. 2. 4. 2 INLET CONNECTION - MOLSTIC-S USE WITH DUT UPSTREAM DUTs that have built in flow control capability, such as MFCs, (and are to be tested in flow control mode) must be tested in the upstream location. Install this type of DUT upstream of the molbloc-S only. © 2004-2007 DH Instruments, a Fluke Company Page 22 2. molstic-S with DUT Upstream Follow these guidelines when connecting the DUT to the upstream of the molstic-S: · Inspect the DUT for contamination: When using the molstic-S with the DUT installed upstream, as is required when calibrating flow devices that control flow, it is recommended practice to inspect the DUT for any material that might contaminate either the molstic plumbing or the molbloc-S elements installed on the molstic. Use inline particulate filters: Since the smaller molbloc-S elements that are compatible with the 1/4 in. There is a filter kit available from DHI for use between the DUT and the inlet of the 1/2 in. molstic-S, to protect the molbloc-S elements from particulate contamination. [. . . ] Open molstic-S flow control/shut off valve(s): All valves must be open to allow test gas to fill the test system. Set flow rate using DUT. © 2004-2007 DH Instruments, a Fluke Company Page 32 3. MOLSTIC-S OPERATION 3. 4. 2 DUT WITHOUT FLOW CONTROL CAPABILITY 3. 4. 2. 1 FLOW CONTROL USING METERING VALVES Slowly raise system pressure to desired test pressure: Rotating the regulator's control knob clockwise raises the outlet pressure. Make final adjustments in control pressure in the direction of increasing pressure in order to obtain the most accurate and stable set point. [. . . ]