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RUSKA 2470
Gas Lubricated Piston Pressure Gauge
Users Manual
PN 3974971
December 2010
© 2010 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
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LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, ha
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Table of Contents Chapter Title Page 1 Introduction......................................................................................... 1-1 How to Contact Fluke ........................................................................................ 1-1 Safety Information ............................................................................................. 1-1 Compressed Gas ............................................................................................ 1-1 Lu
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RUSKA 2470 Users Manual Precautions......................................................................................................... 5-1 General............................................................................................................... 5-2 Low Range Piston Assembly............................................................................. 5-2 Mid Range Piston Assembly.............................................................................. 5-7 High Range
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List of Tables Table Title Page 1-1. Symbols.................................................................................................................. 1-2 iii
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RUSKA 2470 Users Manual iv
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List of Figures Figure Title Page 2-1. Simple Cylinder..................................................................................................... 2-1 2-2. Re-Entrant Cylinder............................................................................................... 2-1 2-3. Controlled Clearance Cylinder............................................................................... 2-2 2-4. Reference Plane Determination......................................................
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RUSKA 2470 Users Manual 6-11. Preparing the Kim Wipe for Cleaning the High Range Cylinder - Step 2 ............. 6-11 6-12. Preparing the Kim Wipe for Cleaning the High Range Cylinder - Step 3 ............. 6-11 6-13. Cleaning the High Range Cylinder ........................................................................ 6-11 6-14. Drying the High Range Cylinder ........................................................................... 6-12 vi
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Chapter 1 Introduction How to Contact Fluke To order accessories, receive operating assistance, or get the location of the nearest Fluke distributor or Service Center, call: • Technical Support USA: 1-800-99-FLUKE (1-800-993-5853) • Calibration/Repair USA: 1-888-99-FLUKE (1-888-993-5853) • Canada: 1-800-36-FLUKE (1-800-363-5853) • Europe: +31-402-675-200 • China: +86-400-810-3435 • Japan: +81-3-3434-0181 • Singapore: +65-738-5655 • Anywhere in the world: +1-425-446-5500 Or, visit Flu
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RUSKA 2470 Users Manual Lubricants and Seals DO NOT use hydrocarbon lubricants in this device, use only approved lubricants. Always use replacement parts specified by Fluke. For more information regarding common replacement parts and recommended lubricants, see Appendix B. Oxygen Compatibility This Instrument has been designed with components that will not introduce hydrocarbons into the calibration process. The O-rings and lubricating grease supplied with the instrument must not
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Introduction Specifications 1 Specifications Low Range Piston Pressure Range (Model 2465) 1.4 to 172 kPa (0.2 to 25 psi) psi gauge Pressure Range (Model 2468) 1.4 to 345 kPa (0.2 to 50 psi) psi gauge (1,2) Pressure Uncertainty Rating 0.0010% (10 ppm) or 0.07 Pa (1.0E-05 psi), whichever is greater Uncertainty Threshold 7 kPa (1 psi) Resolution 1 ppm or 1 mg, whichever is greater Precision (Typical Type A Unc.) 3 ppm (3) Long Term Stability 3 ppm per year Piston/Cylinder Material 44
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RUSKA 2470 Users Manual Temperature Range Operating 18 ºC to 28 ºC Storage -40 ºC to 70 ºC when thermometer and low range piston & Cylinder are stored separately from each other. Humidity Range Operating 20% to 75% noncondensing Storage 0% to 90% noncondensing Pressure Medium Clean dry gas, Nitrogen or equivalent, regulated to a pressure Compatible with each particular Piston/cylinder assembly. Dew Point of less than or equal to -60 ºF Pressure Maximum Working Press
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Chapter 2 General Piston Pressure Gauge Considerations Types of Piston Pressure Gauges The piston pressure gauge is sometimes regarded as an absolute instrument because of the principle by which it measures pressure. An absolute instrument is defined here as one capable of measuring a quantity in the fundamental units of mass, length, time, etc. It may be suggested that only certain types of piston pressure gauges qualify in this category. Figures 2-1, 2-2, and 2-3 illustrate the three
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RUSKA 2470 Users Manual SECONDARY PRESSURE PRESSURE IN glg45.eps Figure 2-3. Controlled Clearance Cylinder When the simple cylinder of 2-1 is subjected to an increase in pressure, the fluid, exerting a relatively large total force normal to the surface of confinement, expands the cylinder and thus increases its area. A pressure-drop appears across the cylinder wall near point A, resulting in an elastic dilation of the cylinder bore. It can be shown that the effective area of the piston
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General Piston Pressure Gauge Considerations Calculations 2 Measurement of pressure with the piston pressure gauge is subject to uncertainties resulting from effects other than those of elastic distortion. But, it was appropriate that the subject of elastic distortion be discussed first, since this characteristic is largely responsible for the various designs that have been developed. Measurement processes proposed for high accuracy are disturbed by limitations in the performance of the
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RUSKA 2470 Users Manual Elastic Distortion of the Cylinder As the pressure is increased within a piston pressure gauge, the resulting stress produces a temporary and reversible deformation of the cylinder. The net effect is a change in the effective area of the piston-cylinder combination. If the change in the area is a linear function of the applied pressure, the relationship may be described by the equation: 2 A = A() 1+ b P + b P e 0 1 2 Where: P is the nominal pressure A is the e
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General Piston Pressure Gauge Considerations Measurement of Pressure with the Piston Pressure Gauge 2 Although the trend is swinging toward the use of true mass in favor of apparent mass, there is a small advantage in the use of the latter. When making calculations for air buoyancy from values of apparent mass, it is unnecessary to know the density of the mass. If objects of different densities are included in the calculation, it is not necessary to distinguish the difference in the calc
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RUSKA 2470 Users Manual It is common practice to associate this position directly with the piston as the datum to which all measurements made with the piston are referenced. It is called the reference plane of measurement, and its location is determined from the dimensions of the piston. If the submerged portion of the piston is of uniform cross section, the reference plane is found to lie conveniently at the lower extremity as shown in 2-4. If, however, the portion of the piston submerg
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General Piston Pressure Gauge Considerations Measurement of Pressure with the Piston Pressure Gauge 2 glg03.bmp Figure 2-5. Head Correction Measurement P =() P − P *h* g H m AIR Where: h is the vertical distance between the reference plane of the Standard and the reference plane of the DUT (Device Under Test) ρ is the density of the air air ρ is the density of the test media m g is the acceleration due to local gravity L1 is the vertical distance from the mass loading location to
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RUSKA 2470 Users Manual For good work, a piston pressure gauge should be provided with an index mark for associating the reference of the piston with other planes of interest within a system. The design of this index will vary with the design and manufacture of the instrument, it may be in the form or an index rod with scribed lines on it, an index groove on the column of the instrument, or, other type of fixed indicator. Not only does the mark serve to establish fixed values of pressure
