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User Manual

PRF-930

POWDER RESISTANCE FIXTURE

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Summary of Contents for PRF-930

Page 1: ...User Manual PRF 930 POWDER RESISTANCE FIXTURE ...

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Page 3: ...rranty 15 General Specifications 16 Table of Contents Copyright 2011 by Prostat Corporation All rights reserved Printed in the United States of America No part of this manual may be used or reproduced in any manner whatsoever without written permission For information contact Prostat Corporation 1072 Tower Lane Bensenville IL 60106 USA Prostat is the registered trademark of Prostat Corporation ...

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Page 5: ...or equivalent laboratory system For guarded plate measurements use an instrument ground reference The PRF 930 Powder Fixture meets requirements of Technical Recommendations of National Institute of Occupational Safety and Health JNIOSH TR No 42 2007 Recommendations for Requirements for Avoiding Electrostatic Hazards in Industry 2007 II Fixture Component Descriptions A Acrylic Frame An electrically...

Page 6: ...against the test material The center plate connects to the resistance instrument using the Black receptacle on the plate s outer surface Figure 4 The measurement guard plate connects to the instru ment s ground reference using the Green receptacle on the outer measurement plate assembly C Power Plate Power is applied to the material under test by the fixture s power plate Connection to the power p...

Page 7: ...ristics approximately 1 0 tablespoon will be required to completely fill the fixture cavity Place the mate rial in the PRF 930 and compress it lightly Material compression should be limited to the degree that represents the material s use transport or storage conditions This is subjective and best determined by personnel most experienced with the material process and applications In any event do n...

Page 8: ...ound reference to the Green guard plate receptical C Making the Resistance Measurement The PRF 930 complies with the fundamental requirements of measuring bulk resistance of pow dered and granulated materials Actual procedures and specified conditions may vary between test methods cited by standards bodies in different countries The PRF 930 was designed in accor dance with the Recommended Practice...

Page 9: ...d required by the applicable standard test method or procedure 9 Record the measurement in ohms D Variables Effecting Resistance Measurements Several factors will effect resistance measurements including Temperature Humidity Material Compression Material Moisture Content Test Voltage Instrumentation Electrification Period Material Composition Other factors depending on conditions and material char...

Page 10: ...ume resistivity ρ in ohm cm we use the follow ing equation to convert the resistance measurement to resistivity Where R Resistance obtained from the material measurement in ohms A Area of the fixture s center plate in cm2 d Distance in cm between the measurement and power plates The relationship of area A divided by distance d is often re ferred to as a correction factor in cm CF which is multipli...

Page 11: ...a 1 Measure center plate diameter Figure 8 2 4 cm 2 Divide center plate diameter by 2 to obtain its radius 1 2 cm 3 Calculate center plate area A G Correction Factor 1 Measure the distance d between the power plate and measurement plate as shown in Figure 9 Assume the measurement is 0 95 cm 2 Divide the area A by the distance d to obtain the correction factor Converting Resistance ohm to Resistivi...

Page 12: ...which is approximately 1 to greater than 1 0x1013 ohm Prevent degradation of the fixture acrylic materials due to crazing which ultimately weakens the frame Cleaning consists of 1 Emptying the fixture of test materials 2 Disassembly 3 Cleaning the measurement plate assemblies which is a different procedure from Cleaning the acrylic frame A Empty the Fixture Dry powder and granulated materials can ...

Page 13: ...d free of material dust then cleaned with a 70 solution of iso propyl alcohol IPA and distilled water The plate should then be thor oughly dried with a clean low linting cloth or tissue as shown in Figure 11 NOTE Do not use this alcohol solution on the acrylic frame assembly The alcohol will damage the material and cause crazing which appears as small cracks that seriously weaken the assembly Clea...

Page 14: ...l cause crazing resulting in many hairline cracks and weaken the assembly Once the metal plates are removed brush any particles from the frame us ing the supplied brush Use a cotton swab where necessary to remove stubborn contaminants Figure 13 Cleaning Acrylic Frame with Brush using Reference Module Figure 14 Cleaning Frame Mounting Grooves with Cotton Swab If necessary wash the acrylic fixture f...

Page 15: ... the acrylic frame assembly Figure 15 Align Metal Plate Edge Flange with Recessed Frame Groove Figure 16 Measurement Plate Alignment Flange seated in Acrylic Frame Recessed Groove Install the power plate opposite the measurement plate in the same manner As before align the edge flanges with the recessed groove Figure 17 Install the screws and make them just snug do not over tighten screws CAUTION ...

Page 16: ...eturned to Prostat postage prepaid with proof of purchase date Warranty Exclusions THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES EXPRESS AND IMPLIED INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED The express warranty will not apply to defects or dam age due to accidents neglect misuse alterations operator error or f...

Page 17: ...ohm cm R Resistance obtained from the material measurement in ohms A Area of the fixture s center plate in cm2 d Distance in cm between the measurement and power plates and ρ R CF Where ρ Volume Resistivity in ohm cm R Resistance obtained from the material measurement in ohms CF Correction Factor Area A of the fixture s center plate in cm2 divided by Distance d in cm between the measurement and po...

Page 18: ...18 Rev A January 2010 PRF 930 Advanced Powder Fixture ...

Page 19: ...NOTES 19 Rev A January 2010 PRF 930 Advanced Powder Fixture ...

Page 20: ...Prostat Corproation All other trademarks and trade names are the property of their respective companies P R O F E S S I O N A L S T A T I C C O N T R O L P R O D U C T S Prostat Corporation Corporate Headquarters 1072 Tower Lane Bensenville IL 60106 630 238 8883 Fax 630 238 9717 1 855 STATIC1 www prostatcorp com ...

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