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Summary of Contents for KERN PBS-A03
- Page 1 KERN & Sohn GmbH Ziegelei 1 Phone: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 email: info@kern-sohn.com Internet: www.kern-sohn.com Operating instructions Density Determination Set KERN PBS-A03/A04 Version 1.3 01/2012 PBS-A03/A04-BA-e-1213...
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Page 2: Table Of Contents
KERN PBS-A03/A04 Version 1.3 01/2012 Operating instructions Set for density determination for precision balances KERN PBJ/PBS Contents: INTRODUCTION ..........................3 ........................3 COPE OF SUPPLY ..........................5 IMENSIONS INSTALLING THE DENSITY DETERMINATION SET ..............6 PRINCIPLE OF DENSITY DETERMINATION ................8 .............. -
Page 3: Introduction
• These operating instructions only describe the operation of the density determination set. For further information on how to operate your balance please refer to the operating instructions supplied with each balance. Scope of supply Fig. 1: Installed density set KERN PBS-A04 PBS-A03/A04-BA-e-1213... - Page 4 1. Weighing tray holder 2. Combination weighing tray 3. Container table 4. Container 5. Weighing tray carrier, 4 items 6. Glass sinker PBS-A03/A04-BA-e-1213...
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Page 5: Dimensions
Dimensions PBS-A03/A04-BA-e-1213... -
Page 6: Installing The Density Determination Set
• For reasons of adjustment, take away the density set and place the standard weighing plate. • The following pictures show the density set KERN PBS-A03 at a balance with big weighing plate. The density set KERN PBS-A04 must be installed at the same way. - Page 7 5. Place the container table in a way that it does not touch the balance tray holder. 6. Put the containers in the center of the container table 7. Hook up the combination balance tray according to illustration; ensure that it does not touch the container. PBS-A03/A04-BA-e-1213...
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Page 8: Principle Of Density Determination
1 kg, has the volume of 1 m³. Additional frequently applied units include: The application of this density determination set in combination with the KERN PBS/PBJ balances provides fast and safe determination of solids and fluids. Our set uses the "Principle of Archimedes"... -
Page 9: Influencing Magnitudes And Error Sources
Influencing magnitudes and error sources Air pressure temperature Volume deviance of the sinker (± 0,005 cm Surface tension of the liquid Air bubbles Immersion depth of the sample dish of sinker Porosity of the solid PBS-A03/A04-BA-e-1213... -
Page 10: Density Determination Of Solids
Activate function Switch on balance MENU In weighing mode press repeatedly until „U“ flashes. TARE / Press MENU Press repeatedly until „U-d“ is displayed. From now on the balance is in density determining mode for solids. PBS-A03/A04-BA-e-1213... -
Page 11: Input „Density Measuring Liquid
TARE / Acknowledge with Observe that the stability mark is displayed, if not, the entry has not been accepted. ON/OFF Press repeatedly or keep pressed for 3 sec until the gram display will appear. PBS-A03/A04-BA-e-1213... -
Page 12: Measurement „Density Solid Material
, before the current sample is removed from the lower sample dish. For the new measurement start at step 2. When using an other measuring liquid, start at the entry „Density measuring liquid“, see chapter 4.2. UNIT Using the balance returns into the weighing mode. PBS-A03/A04-BA-e-1213... -
Page 13: Determining Density Of Liquids
Place sinker in the upper sample dish. Wait for stability display to appear; write down the displayed weighing value. Place sinker in the lower sample dish. Wait for stability display to appear; write down the displayed weighing value. PBS-A03/A04-BA-e-1213... -
Page 14: Density Determination At Known Volume Of The Sinker
Prepare balance as described in chapter 2 "Installation of density determination set". Fill test liquid in the container. Filling height should be approx. ¾ of the capacity. Heat sample liquid until temperature is constant. Keep the sinker ready PBS-A03/A04-BA-e-1213... - Page 15 Weight of the sinker in air [ A ] - weight sinker in test liquid [ B ] From this follows: ρ = ρ = density of sample fluid A = weight of sinker in air B = weight of the sinkers in test liquid V = volume of sinker PBS-A03/A04-BA-e-1213...
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Page 16: Preconditions For Precise Measurements
ρ enters into the common denominator and, thus, has considerable influence on the accuracy of the result. The result for the density of the sample cannot be more accurate than the least accurate of the aforementioned individual entities. PBS-A03/A04-BA-e-1213... -
Page 17: Influence Factors For Measurement Errors
Both the buoyancy and the sinker volume are desired to have as many significant figures as possible for precise results. Because they are the numerator and denominator of the expression to compute the liquid. Seeking accurate volume of the sinker is also important. PBS-A03/A04-BA-e-1213... -
Page 18: General Information
When changing the ambient temperature or location, an adjustment of the balance is necessary. For this purpose remove the density set and carry out adjustment using the standard weighing tray (see operating instructions supplied with the balance). PBS-A03/A04-BA-e-1213... -
Page 19: Density Table For Fluids
0.9976 0.7867 0.7880 0.9973 0.7859 0.7870 0.9971 0.7851 0.7870 0.9968 0.7842 0.7861 0.9965 0.7833 0.7852 0.9963 0.7824 0.7842 0.9960 0.7816 0.7833 0.9957 0.7808 0.7824 0.9954 0.7800 0.7814 0.9951 0.7791 0.7805 0.9947 0.7783 0.7896 0.9944 0.7774 0.7886 0.9941 0.7766 0.7877 PBS-A03/A04-BA-e-1213... -
Page 20: Uncertainty Of Measurement For Density Determination Of Solids
10. When using a balance with a readability of 0.001 g, divide the numbers through 10. Reading example for table: In a balance with a resolution of 0.001 g and a sample with a weight of 10 g, whose density is 5 g/cm , the display graduation is at 0.007 g/cm PBS-A03/A04-BA-e-1213... -
Page 21: User Instructions
If the density of your solid body just deviates slightly from that of distilled water, ethanol • may be used as measuring liquid. However, check beforehand whether the sample is solvent-proof. In addition you must observe the applicable safety regulations when working with ethanol. PBS-A03/A04-BA-e-1213...
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