Agilent Technologies 979 Detector NW25 Calibrated Leak: Instructions
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1. NOTICE This document contains references to Varian Please note that Varian Inc is now part of Agilent Technologies For more information go to www agilent com chem uE Agilent Technologies FIELD INSTRUCTION SHEET Instructions for Calibrated Helium Leak Manual No 699909988 Revision A Date October 2002 This page intentionally left blank Varian Field Instruction Sheet Instructions for Calibrated Helium Leak INTRODUCTION The calibrated helium leak is designed for use in calibrating helium leak detectors It is equipped with an integral helium reservoir and an isolating valve and is furnished with either an NW25 or a 1 1 8 inch diameter sealing surface to fit the test port of any Varian Leak Detector USE The details of tuning and calibration of the leak detector are described in the appropriate section of the leak detector manual When the calibrated leak is not in use it should always be left with the valve open and be stored at the same temperature at which it will be used PRINCIPLES OF OPERATION The helium reservior consists of the nickel plated cylinder to which the label adheres The valve communicates with a hollow pyrex glass finger which protrudes into the helium reservior Helium atoms permeate through glass moving through the inter molecular spaces in the glass This permeation rate is dependent on the pressure of helium on each side of the glass and on the thickness and temperature of th2. USA Tel 1 781 861 7200 Toll Free 1 800 882 7426 Fax 1 781 860 5437 China Varian Technologies China Ltd Room 1648 Central Tower South Wing Beijing Junefield Plaza No 10 XuanWuMenWai Street Beijing 100052 P R China Tel 86 10 6310 8550 Toll Free 800 820 6556 Fax 86 10 6310 0141 France Varian s a 7 avenue des Tropiques Z A de Courtaboeuf B P 12 91941 Les Ulis cedex France Tel 33 0 1 69 86 38 84 Fax 33 0 1 69 86 29 88 Benelux Varian Vacuum Technologies Herculesweg 8 4338 PL Middelburg The Netherlands Tel 31 118 671570 Fax 31 118 671569 Germany amp Austria Varian Deutschland GmbH Alsfelder Strasse 6 Postfach 11 14 35 64289 Darmstadt Germany Tel 49 0 6151 703 353 Fax 49 0 6151 703 302 India Varian India Pvt Ltd 205 A A wing of Galleria 2nd floor Hiranandani Gardens Powai Mumbai 400 076 India Tel 91 22 2570 8595 8597 Fax 91 22 2570 8599 Mobile 91 98 679 55969 04 08 Sales and Service Offices Italy Varian Inc via F lli Varian 54 10040 Leini Torino Italy Tel 39 011 997 9111 Toll Free 00 800 234 234 00 Fax 39 011 997 9350 Japan Varian Technologies Japan Ltd 8th Floor Sumitomo Shibaura Building 4 16 36 Shibaura Minato ku Tokyo 108 Japan Tel 81 3 5232 1253 Toll Free 0120 655 040 Fax 81 3 5232 1710 Korea Varian Technologies Korea Ltd Shinsa 2nd Bldg 2F 966 5 Daechi dong
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4. A Seal the product in a plastic bag and package the product carefully to avoid damage in transit You are responsible for loss or damage in transit A Varian Inc is not responsible for returning customer provided packaging or containers A Clearly label package with the RA number Using the shipping label provided ensures the proper address and RA number are on the package Packages shipped to Varian without an RA clearly written on the outside cannot be accepted and will be returned Return only products for which the RA was issued Product being returned under an RA must be received within 15 business days Ship to the location specified on the printable label which will be sent along with the RA number as soon as we have received all of the required information Customer is responsible for freight charges on returning product Return shipments must comply with all applicable Shipping Regulations IATA DOT etc and carrier requirements Return the completed request for return form to your nearest location North America Europe Pacific Rim FAX 1 781 860 9252 FAX 00 39 011 9979125 Please visit our website for Toll Free 800 8VARIAN Fax Free 00 800 345 345 00 ee a j individual office information 800 882 7426 Toll Free 00 800 234 234 00 http www varianinc com vtl ra varianinc com vtt ra varianinc com vacuum Canada Central coordination through Varian Inc 121 Hartwell Avenue Lexington MA 02421
5. VARIAN ce
6. e The final page of this document lists all the Varian offices from which you can obtain technical assistance In the United States contact Varian Vacuum Technologies Customer Service at 1 800 8Varian or on line at www varianinc com vacuum Instructions for NW25 Calibrated Helium Leak Page 1 of 1 Document No Revision 699909988 A ap VARIAN lt IMPORTANT Instructions for returning products Dear Customer Please follow these instructions whenever one of our products needs to be returned 1 Complete the Request for Return form on our website www varianinc com and send it to Varian see below taking particular care to identify all products that have pumped or been exposed to any toxic or hazardous materials After evaluating the information Varian will provide you with a Return Authorization RA number via email or fax as requested Note Depending on the type of return a Purchase Order may be required at the time the Request for Return is submitted We will quote any necessary services evaluation repair special cleaning eg Important steps for the shipment of returning product A Remove all accessories from the core product e g inlet screens vent valves A Prior to shipment drain any oils or other liquids purge or flush all gasses and wipe off any excess residue A If ordering an Advance Exchange product use the packaging from the Advance Exchange to return the defective product
7. e glass If the valve of the calibrating leak is left closed helium will continue to leak into the glass finger until the helium pressure inside the finger is equal to that in the reservior this would take about a year in fact As this pressure builds up however helium would be absorbed on the metal walls and the inter molecular spaces in the glass will become saturated For both these reasons a high leak rate will be apparent for some time after re opening the valve so it is recommended that the valve be left open The leak rate of the calibrated leak is very stable and is not affected by moisture or dust which can migrate in during periods of disuse The leak rate is dependant of two effects however A Depletion There is some finite depletion of the reservior over time This is a function of the leak rate and the volume of helium in the reservior The table below shows typical depletion rates in percent per year for some typical leak rates P N Suffix 301 321 302 322 303 323 304 324 ae ee AO Nominal Leak Rate Depletion per Year approx Refer to chart attached to neck of Calibrated Helium Leak B Temperature The rate at which helium permeates the pyrex is affected by the temperature of the glass The actual leak rate increases with increased temperature at 3 per degree Celcius About one tenth of this is attributable to increase of the helium pressure with increased temperature Technical Assistanc
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Agilent Technologies 979 Detector NW25 Calibrated Leak: Instructions