Adam Equipment AE DENSITY DETERMINATION KIT (For PW and PGW BALANCES) (P.N. 8290, Rev.
© Adam Equipment Company 2007 2
1.0 INTRODUCTION The Density Determination Kit from Adam Equipment allows the users of PW and PGW series of balances to determine the density of solids and liquids directly using the internal program of the balance. 2.0 FEATURES • Easy to use - all the activities are described by a message on the display for user. • Reliable (all the calculations are done by the balance). • Speed of test (the result is shown immediately after the sample is placed into the water or the float is placed into the liquid).
3.0 COMPONENTS The kit consists of the following components1. Glass Float of known volume, with 2. String 3. Hook 4. Thermometer 5. Base to support beaker 6. Beaker 7. Pan and Hanger – This replaces the original pan of the balance during density determination. Pan provided in the kit is different for use with PW and PGW. For PW, this comes as a single part. For PGW, this comes in two separate parts and need to be assembled (see section 4) 8.
4.0 INSTALLATION • Replace the original pan with the pan and hanger (7) supplied with the kit. NOTE: For the kit supplied for PGW, the pan with hanger (7) needs to be assembled. Remove the two nuts from the hanger ends, insert the two ends through the holes of the substitute pan from top and fasten the nuts at the bottom of the pan to keep the hanger in the upright position. • Place the beaker support (5) over the hanger so that they do not touch each other.
5.0 MEASUREMENT OF SOLID DENSITY To perform the density of solids test, the user must have a method to immerse the solid item in a chosen liquid. The density of the liquid must be known or determined from a look-up table. For water and ethanol the density will be calculated based on the temperatures entered using the numeric entry method, when asked by the balance.
density (g/cc) using the numeric entry method • Press [Enter] to continue • The balance will request for the weight of the sample in air by displaying “AIR WEIGHT”. Place the solid item on the top pan. When the sample pan is stable, press [Enter] to determine the value • After completion of the air weighing, the balance will request for the weight in liquid by displaying “LIQUID WT”. Submerge the solid item into the liquid. When stable, press [Enter] to start the liquid weighing.
• When “DENSITY LIqUId” is displayed, press [Enter] • The volume will be asked for. Enter the volume using the numeric entry method or continue using the last volume entered • Press [Enter] to continue • The balance will request for the weight in air by displaying “AIR WEIGHT”. Place the glass plumb supplied with the density determination kit in air on the weighing pan.
• Be certain any air bubbles are removed. • Dry the sample completely between tests. • Be very careful not to transfer water to the top pan when using tweezers. • Samples should be 5 grams or greater. • Degrease the glass float before using. • Dry the float completely between each test. Be careful not to put a static electric charge on the glass float. It may be necessary to use an anti-static cleaner on the float. • Wash the beaker before filling it with any liquid.
APPENDIX A A method to determine the volume of the float To determine the volume of the float the following equation can be used. V = A-B [cm3 ] ρ-d A - mass of float in air B - mass of float in distilled water V - float volume ρ – density of distilled water d – density of air [g] [g] [cm3 ] [g/cm3 ] The following formula is used to determine the density of air (d) to use in the above equation.
APPENDIX B DENSITY OF DISTILLED WATER WATER TEMPERATURE 0ºC 4ºC 10ºC 15ºC 20ºC 25ºC 30ºC DENSITY 0.99984 g/cm3 0.99997 g/cm3 0.99970 g/cm3 0.99910 g/cm3 0.99821 g/cm3 0.99705 g/cm3 0.99565 g/cm3 1 0.9995 0.999 0.9985 0.998 Series1 0.9975 0.997 0.9965 0.996 0.9955 0 5 10 15 20 25 30 Density of Distilled Water versus temperature ºC 0 10 20 30 0 1 2 3 4 5 6 7 8 9 0.99984 0.99990 0.99994 0.99996 0.99997 0.99996 0.99994 0.99990 0.99985 0.99978 0.99970 0.99961 0.99949 0.99938 0.
ADAM EQUIPMENT is an ISO 9001:2000 certified global organisation with more than 30 years experience in the production and sale of electronic weighing equipment. Products are sold through a world wide distributor network supported from our company locations in the UK, USA, SOUTH AFRICA and AUSTRALIA. ADAM’s products are predominantly designed for the Laboratory, Educational, Medical and Industrial Segments.
