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. Information in this document is subject to change without notice. [. . . ] molbox1-A700K has a maximum operating pressure of 600 kPaa (87 psia), and molbox1-A350K has a maximum operating pressure of 250 kPaa (36 psia). If a contaminated device under test is located upstream of the molbloc, contaminants may flow from the device under test to the molbloc-S and alter its calibration. If the device under test must be connected upstream of the molbloc-S, be sure it is clean before flowing and consider installing a filter between the DUT and the molbloc. The gas supply to the molstic-S has the following requirements: · · The gas supply must be clean and free of particulate contamination in order to avoid damage to the molbloc. For correct measurements, the gas must be of the same species as that selected by the molbox [GAS] function. Use of ambient air (moist air) is supported by the molbox. Gas purity will affect the measurement uncertainty of the flow measurements as molbox uses the thermodynamic properties of the flowing gas in its calculations. Use gases with purity of 99. 9 % or better for molbloc measurements. 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. or 1/2 in. , P/N 401880 and 401881, respectively. Figure 16. 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. P/Ns 401876 and 401877 are compatible with the 1/4 in. 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. Insure that the shut-off valve(s) is in the closed position. 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. [. . . ] Open molstic-S shut off valve(s): All shut off valves must be open to allow test gas to fill the test system. Adjust system flow rate: Rotate the flow control valve adjustment knob to set the desired flow rate on the molbloc-S. Fine adjustments in flow rate can be achieved by combining adjustments in the supply pressure with adjustments in the flow control valve. 3. 4. 2. 2 FLOW CONTROL USING THE PRESSURE REGULATOR Set inlet pressure to minimum: Turn the regulator's adjustment knob counterclockwise until the spring force has been relieved. Open molstic-S shut off valve(s): All shut off valves must be open to allow test gas to fill the test system. [. . . ]