Manual Density - Vetek Weighing AB
Contents
1. Density 13 57 20 0 000 Place an object Enter 0 100 Lol Fig 8 Density of solids the first step in the procedure sample on the Fig 9 Weighing in the air balance elevation 15 03 04 Density Weighing in the air Place an object Enter 14 201 5 0 100 13 57 20 Fig 11 Weighing in liquid balance elevation 20 15 03 04 Density 13 57 20 Weighing liquid Place an object Enter 13 122 07 100 Fig 12 Weighing in liquid weighing result End of procedure 15 03 04 Density 13 57 20 W1 14 201 W2 13 830 0 0 9959 to continue Units 28122 2 0 100 Fig 13 End of procedure density result Function keys select MODE weighing filling etc il lcd display Printing result of density Fig 14 Function keys 21 8 5 1 DENSITY MEASUREMENT OF SOLIDS WITH DENSITY LOWER THAN DENSITY OF LIQUID the sample floats on liquid surface The measurement is carried out similarly to above described process The only difference is the need to place the sample under the bottom pan during the second measurement measuring mass of a sample in liquid Caution In case sample s displacement is larger than the pan i e its weight put supplementary load onto the bottom weighing pan D sample under the ran bottom weighing pan Fig 15 Weighing in liquid balance elevati2. Select mode of density determination solids and liquids from balance s menu Liquid Select liquid in which the density determination process is carried out distilled water alcohol spirit 100 0 196 at 20 other liquid with known density Temperature Temperature value which should be given by reading it from kit s thermometer The temperature value is a parameter included calculation of density value For option OTHER give medium value of density Density Density of liquid depends on the temperature For WATER and ALCOHOL the density value is acquired from density value tables stored in balance s memory On inserting liquid temperature read from the thermometer the density value is calculated automatically For option OTHER write the density of liquid Statistics Statistics are calculated for the following density measurements if option STATISTICS is enabled set to YES in mode s options Run Start the procedure 8 4 DENSITY OF LIQUID MENU PREVIEW Density setup 6 01 Procedure LIQUID DENSITY 02 Sinker volume 1 00000 cm3 03 Statistics OFF 04 Run SOLID DENSITY LIQUID DENSITY Lrg bs gt i select Fig 5 Density of liquid menu preview 16 Select the density determining procedure to be carried out Sinker volume Volume of the sinker is given on its hook Insert this value to balance s memory and save it Statistics St
3. Caution Density kit components should be stored in its intended Do not leave the pans of the density kit nor the sinker on tabletop as it may damage the density kit components Unless the set of pans or the sinker are in use they should be placed on an additional stand 5 DENSITY DETERMINATION KIT FOR SOLIDS AND LIQUIDS DEDICATED FOR BALANCES PS SERIES 7 4 8 _ 3 1 9 2 Draw 2 Components of the KIT for analytical balances Components of the density kit 1 Weighing pan with stand 7 Thermometer 2 Bottom weighing pan of density Thermometer handle determining kit for solids 3 Flexible connector 9 Sinker Top weighing pan of density 2 determining kit for solids 19 Beaker banis 5 11 Additional stand for set of pans or a sinker Additional set of pans for determining density of solids 6 Hook 12 which density is lower than density of water Caution Density kit components should be stored in its intended box 10 Do not leave the pans of the density kit nor the sinker on tabletop as it may damage the density kit components Unless the set of pans or the sinker are in use they should be placed on an additional stand 6 ASSEMBLING THE DENSITY KIT ON BALANCE XA SERIES 11 7 ASSEMBLING THE DENSITY KIT 7 1 ON BALANCES PS SERIES 7 2 BALANCES AS SERIES 8 DENSITY MEASUREMENT PROCESS B
4. on the top pan of the density kit and then in liquid bottom weighing pan Lofid A 00000 Fig 43 Solids density measure in air When balance s display indicates LOAD A then zero load sample on the top weighing pan of the density kit 41 a Fig 44 Density determination of solids measurement in the air balance elevation Press PRINT key on stable measurement result The result is stored in balance s memory The display indicates a command to place sample on the bottom weighing pan LoAd L 00000 7j Fig 45 Density determination of solids measurement in liquid 42 As the display indicates LOAD L command and zero indication load the sample on the bottom weighing pan of the density kit sample on the bottom pan Fig 46 Density determination of solids measurement in liquid balance elevation Press PRINT key on stable measurement result The result is stored in balance s memory and the display indicates the calculated value of density of a tested solid object 2 3455 Fig 47 Density determination of solids final density result 43 CAUTION Pay special attention to presence of air bubbles during measuring process If air bubbles are on sample s surface during measuring process they may be a source of unreliable measurements Function keys after completing the procedure Printout result of density Start next procedure
5. of solids density Return to menu So Fig 47 Function keys The result is presented on balance s display is locked and expressed in g cm Press F key to go back to menu 10 2 1 DENSITY MEASUREMENT OF SOLIDS WITH DENSITY LOWER THAN DENSITY OF LIQUID sample floats on liquid surface The measurement is carried out similarly to above described process The only difference is the need to place the sample under the bottom pan during the second measurement measuring mass of a sample in liquid Caution In case sample s displacement is larger than the pan i e its weight put supplementary load onto the bottom weighing pan 44 Sample under the bottom weighing pan Fig 48 Measurement in liquid balance elevation 45 10 3 DENSITY MEASUREMENT OF LIQUID Assemble the density determining kit for liquid Procedure 1 Disassemble the weighing pan 2 Assemble the density kit in accordance with point 7 of this user manual 3 If the display indicates command null use supplementary weights of the density kit 4 Press ZERO TARE key to set the display indication to zero 5 Pour tested liquid into the beaker amount of liquid should be fixed in a way that the sinker is completely immersed in the liquid 6 Preparations for measurement process are completed now Fig 49 Density determination of liquid preparations 46 Measuring procedure Press Mode key then usin
6. 20 0 99820 0 99799 0 99777 0 99754 0 99730 0 99704 0 99678 0 99651 0 99623 0 99594 30 0 99565 0 99934 0 99503 0 99470 0 99437 0 99403 0 99368 0 99333 0 99297 0 99259 11 2 Table 2 Relation of water density from temperature Official Journal of Measures No 7 94 Water temperature Density of water g cm 17 0 0 9988 51 11 3 Table 3 Density of some substances Mechanical Engineer s Handbook Vol 1 2 270 Copper 8 1300 1400 Wood oak Molybdenum Linoleum 7 3 led M4 ains 99 89 11 4 Table 4 Density of types of liquid at 20 Mechanical Engineer s Handbook Vol 1 Spindle 660 740 500 850 1260 9175 Nitric acid 20 1120 1050 User manual no LMI 46 03 04 13 A 52 MANUFACTURER OF ELECTRONIC WEIGHING INSTRUMENTS R A D W RADWAG BALANCES AND SCALES 26 600 Radom Bracka 28 POLAND phone 48 48 384 88 00 fax 48 48 385 00 10 e mail export radwag com www radwag com cA DIN EN ISO 9001 2000 CERTYFIKAT Nr 71 100 C20 53
7. ALANCES SERIES 8 1 DENSITY FUNCTION IN BALANCE MENU Weighing 13 57 20 0 0000 15 03 04 Setup 13 57 24 P2 GLP P3 Date Time P4 Readout RS 292 15 03 04 13 57 28 Printouts gt 01 Parts cout 1 enabled Units 02 Checkweighing 11 enabled Modes 03 Filling 1 enabled 04 Percent 1 enabled 05 Animal 11 enabled 06 gt Density 1l enabled 07 Formulation 1 enabled Fig 1 Balance menu density mode The density mode should be set to value 1 enabled In such case the density determining mode is available through pressing MODE key on balance s overlay E select field digit to change 5 9 change value of selected field confirm value cancel Fig 2 Function key on balance s keyboard 14 On assembling the density determination kit it is not possible to adjust the balance correctly Therefore adjust the balance before assembling the density kit 8 2 DENSITY MODE ACTIVATING Weighing 15 03 04 MO Basic weighing 1 Parts couting M2 Checkweighing M3 Filling M4 Percent M5 Animal 6 Density cies Fig 3 Activating density mode 8 3 DENSITY OF SOLIDS MENU PREVIEW Density setup Procedure SOLID DENSITY Liquid WATER Temperature 22 Density 0 99860 Statistics OFF Run SOLID DENSITY LIQUID DENSITY Lrg Dn E ad select Fig 4 Density of solids menu preview 15
8. F SOLIDS WITH DENSITY LOWER THAN DENSITY OE LIQUID 2 cerent ce D n td ree cea ei 22 8 6 DENSITY MEASUREMENT OF LIQUID esee 24 9 DENSITY MEASUREMENT IN BALANCES PS 28 9 1 DENSITY MEASUREMENT OF 5 5 28 9 1 1 DENSITY MEASUREMENT OF SOLIDS WITH DENSITY LOWER THAN DENSITY OF LIQUID 34 9 2 DENSITY MEASUREMENT OF 35 10 DENSITY MEASUREMENT BALANCES AS 39 10 1 DENSITY FUNCTION IN THE BALANCE 39 10 2 DENSITY MEASUREMENT OF SOLIDS sse 40 10 2 1 DENSITY MEASUREMENT OF SOLIDS WITH DENSITY LOWER THAN DENSITY OF LIQUID 44 10 3 DENSITY MEASUREMENT OF 46 11 55 e ste acta 51 11 1 Table 1 Relation of distilled water density from 51 11 2 Table 2 Relation of water density from temperature Official Journal of Measures No 7 94 51 11 3 Table 3 Density of some 52 11 4 Table 4 Density of types of liquid 209 52 1 INTRODUCTION Determining density of solids and liquids is an indispensable process majority of laboratories Considering this fact RADWAG com
9. S key select F6 d Co Press PRINT key to start density determining procedure Press UNITS key and select liquid in which density will be determined 0 0000 56 FO Fes F3 Hilo Pref el F5 28 210 lak LM E rayc fnot HEr Fig 40 Selecting liquid for density determining of solids Density of solids can be determined in three types of liquid e 20 distilled water e 2 5 spirit 100 0 1 in temp 20 e AnotHEr another liquid with known density After selecting liquid accept it by pressing PRINT key 40 H2O or C H5OH are selected specify liquid s temperature Read the temperature value from the thermometer attached to density kit and enter the temperature value to the balance by pressing UNITS or MODE key 20 Fig 41 Density of solids liquid temperature After entering temperature value press PRINT key If AnotHEr liquid was selected specify its density Another gt e 00010000 Fig 42 Density determining procedure of solids selected liquid is Another Press UNITS MODE key to change the value of a digit Press F key to select a digit After selecting density of liquid press PRINT key to accept it After setting all data the balance automatically moves to density determining process First weigh tested sample in the air
10. User Manual User manual LMI 46 03 04 13 A DENSITY DETERMINATION KIT FOR SOLIDS AND LIQUIDS for series for PS series for AS series laraest webshooforscales www vetek com info vetek com APRIL 2013 29 Table of Contents M nlsuleje m 4 2 PRINCIPLE OF DENSITY 5 2 1 DEFINITIONS ste 2 2 SOURCE OF MEASUREMENT ERRORS MANUFACTURER S RECOMMENDATIONS eere DENSITY DETERMINATION KIT FOR SOLIDS AND LIQUIDS DEDICATED FOR BALANCES AS SERIES 5 iare hie erri entente cereis 9 5 DENSITY DETERMINATION KIT FOR SOLIDS AND LIQUIDS DEDICATED FOR BALANCES PS SERIES eie 10 ASSEMBLING THE DENSITY KIT ON BALANCE 11 ASSEMBLING THE DENSITY KIT eere nnnn nnn 12 721 ONBALANCES PS SERIES ne tht e nee Lato 12 7 2 ON BALANCES AS 5 13 8 DENSITY MEASUREMENT PROCESS BALANCES XA X SERIES 14 8 1 DENSITY FUNCTION IN BALANCE MENU 14 8 2 DENSITY MODE ACTIVATING 15 8 3 DENSITY OF SOLIDS MENU PREVIEW 15 8 4 DENSITY OF LIQUID MENU PREVIEW 16 8 5 DENSITY MEASUREMENT OF SOLIDS eee 17 8 5 1 DENSITY MEASUREMENT O
11. and LoAd 1 48 Lofid L 5 n T 0 0000 Fig 54 Density determination of liquid step 2 Place the beaker with tested liquid on density kit s basis Gently hang the sinker using its hook on the stand The sinker has to be fully immersed in the tested liquid Fig 55 Density determination of liquid measurement in liquid balance elevation As the measurement result is stabilized press PRINT key result is stored in balance s memory and the display indicates calculated value of liquid density 49 F 23155 Fig 56 Density determination of liquid final result CAUTION Pay special attention to presence of air bubbles during measuring process If air bubbles tack to sinker s surface during measuring process they may be a source of unreliable measurements Function keys on balance s overlay after completing the density determination procedure Printout result of density Start next procedure of liquids density Return to menu So Fig 57 Function keys The result is presented on balance s display is locked and expressed in g cm Press F key to go back to menu 50 11 TABLES 11 1 Table 1 Relation of distilled water density from temperature 0 0 99984 0 99990 0 99994 0 99996 0 99997 0 99996 0 99994 0 99990 0 99985 0 99978 10 0 99970 0 99961 0 99949 0 99938 0 99924 0 99910 0 99894 0 99877 0 99860 0 99841
12. ash the beaker Liquid level should be fixed at a level that ensures sinker s immersion by 10 15 mm below liquid surface Hang the sinker on the hanger gently avoiding shocks Tested liquid may be a factor disturbing the measurement as it tacks to the sinker In such case sinker s mass measured in the air may differ in the following measuring processes Therefore ary the sinker after each weighing in liquid e Avoid drying the sinker using cloths made of plastics as they create electrostatic charges It is recommended to dampen the cloth using antistatic liquid or antistatic foam e Damage of the glass sinker produced during the operation breaks bruises are not repaired under warranty DENSITY DETERMINATION KIT FOR SOLIDS AND LIQUIDS DEDICATED FOR BALANCES XA AS SERIES 1 9 Draw 1 Components of the KIT for balances AS series Components of the density kit 1 Beaker basis 8 Hook RN Top weighing pan of density 2 Stand for weighing pans 9 determining kit for solids 3 Sinker 10 Pans flexible connector Bottom weighing pan of density 4 11 determining kit for solids 5 Thermometer handle 12 Supplementary weight 6 Thermometer 13 Additional stand for set of pans ora sinker Additional set of pans for determining 7 Sinker s flexible connector 14 density of solids which density is lower than density of water
13. atistics are calculated for the following density measurements if option STATISTICS is enabled set to YES in mode s options Run Start the procedure 8 5 DENSITY MEASUREMENT OF SOLIDS Assembly the density determining kit for solids Fig 6 Balance PS series with assembled density determining kit for solids 17 Procedure Disassemble the weighing pan Assemble the pan of the density kit Place the beaker on the stand in a way it does not touch the weighing pan Assemble the thermometer in its handle and assemble the handle onto beaker s edge Pour into the beaker liquid in which the sample will be tested about 34 of beaker s capacity Assemble weighing pans stand centrally inside the beaker Check temperature of liquid in the beaker During density measurement liquid temperature should be stabilized liquid density depends on temperature Preparations for density determination process of solids are completed now Press ZERO TARE key on balance s overlay Wetahing 15 47 14 12 423 Units Setup Fig 7 Tarring a balance Select liquid in which a measurement is carried out If WATER or ALCOHOL is selected then read liquid temperature value on attached thermometer and insert it into balance s memory Should statistics be used enable them in option 05 statistics option YES Move the marker to position RUN and press F key to start the density determining procedure 18
14. ease oil 3 MANUFACTURER S RECOMMENDATIONS 1 Density of solids should be determined on basis of a few measurements 2 Tested sample has to be degreased 3 Incase of objects with oval shape which are difficult to hold using tweezers cut a notch for secure grasp of the sample 4 Sample surface must not be porous It creates favourable conditions for sticking of air bubbles 5 Before each following density measurement dry a sample Unless the sample is dried it may effect in its different mass while weighing in the air and density determination result is 7 11 12 13 14 15 16 17 Caution burdened with an error Tested material should be loaded gently on density kit s pans avoiding shocks Liquid level has to be fixed at a level that the arm of the lower weighing pan is fully immersed in the liquid Sample size should match the size of the density kit s weighing pans Mass of a sample used for testing should not exceed 5 g Water remaining on the tweezers while carrying a sample onto the upper pan of the density kit may be a factor disturbing the measurements Therefore after removing the sample from liquid remember to dry the tweezers Liquid density should be determined on basis of a few measurements Tested liquid should be stabilized for its temperature The sinker has to be degreased It its surface is covered with grease it may easily tack air bubbles Before measurement carefully w
15. g navigating arrows go to submenu F7 d Li 000006 Fl bAS PcS TS 9 F3 Hilo FY Pech 6 F5 Prcb 4 F 1 0 1 gt al vol lt Fig 50 Density determining procedure of liquid Press PRINT key to initiate the density determining procedure the display indicates command vol insert volume of the sinker it is given on sinker s hook 00 10 0000 Fig 51 Density determination of liquid setting sinker s volume Insert sinker s volume that is specified on its hook accuracy of the volume depends on the value given on the hook Insert the sinker s volume using the following keys Press key to select the digit Press MODE or UNITS key to change the digit value Press PRINT key to accept value Caution Data on sinker s volume is stored in balance s memory 247 accepting the value balance s indication is automatically zeroed The display indicates a command LoAd A and 0 000 appears on the display A 0000 2 Fig 52 Density determination of liquid step 1 Hand the sinker on the stand of the density kit and weigh it in the air Fig 53 Density determination of liquid measurement in the air balance elevation As the measurement result is stabilized press PRINT key The result is stored in balance s memory The display indicates a comm
16. ghing float in the air display preview Take the sinker off the hook Put the beaker with tested liquid onto the basis the beaker must not touch the stand Gently hang the sinker on the hook 26 sinker should be fully immersed in the tested liquid Fig 21 Weighing in liquid view elevation Density 13 57 20 Weighing in a liquid Place an object Enter 22 729 0 100 Fig 22 Weighing in a liquid weighing result Press ENTER key when weighing result is stabilized 52752 End of procedure 15 03 04 Density 13 57 20 W1 23 446 W2 22 729 V 10 5640 to continue Units 0 067 0 100 Fig 23 End of procedure final result of density measurement Function keys me select MODE Switch OFF display weighing filling etc Printing result of density Fog 24 Function keys 9 DENSITY MEASUREMENT IN BALANCES PS SERIES 9 1 DENSITY MEASUREMENT OF SOLIDS Remove the weighing pan and instead assemble the density kit which is presented in point 7 of this user manual Place a beaker on the basis in a way it does not touch the stand Attach the thermometer to its clamp and assemble it to beaker s edge Pour liquid into the beaker distilled water alcohol or other liquid with known density to about 34 of beaker s volume Assemble the stand for the weighing pan centrally inside the beaker then check the temperature in the beaker Remembe
17. ghing pan of the density kit e When the balance displays stability marker press Print Enter key e When the balance displays command Load L load the sample on the bottom weighing pan of the density kit After displaying stability marker press Print Enter key 31 sample the bottom pan Fig 29 Density determining procedure of solids sample mass measurement on the top and bottom weighing pan of the density kit balance displays density measurement result expressed 239 g cm CAUTION Pay special attention to presence of air bubbles during measuring process If air bubbles are on sample s surface during measuring process they may be a source of unreliable measurements To carry out repeated liquid selection press F key n coHSDH Anot ie 226 Fig 30 Method of reselecting liquid for density determining procedure To return to weighing mode press Mode key and then Zero Tare key F gigs d to gt on i 0 000 Fig 33 Return to weighing In order to weigh the sample again press Units key F 2184 A Fig 32 Method of moving to repeated sample weighing 33 9 1 1 DENSITY MEASUREMENT OF SOLIDS WITH DENSITY LOWER THAN DENSITY OF LIQUID sample floats on liquid surface The measurement is carried out similarly to above described process The only difference is the need to place t
18. he sample under the bottom pan during the second measurement measuring mass of a sample in liquid Caution In case sample s displacement is larger than the pan i e its weight put supplementary load onto the bottom weighing pan T f sample under the 2 J bottom weighing pan Fig 33 Weighing in liquid balance elevation 34 9 2 DENSITY MEASUREMENT OF LIQUID Remove the weighing pan and instead assemble the density kit which is presented in point 7 of this user manual If the display indicates command null use supplementary weights of the density kit Press ZERO TARE key if displayed indication is other than zero Pour tested liquid into the beaker the sinker should be fully immersed in the tested liquid Procedure e Press Mode key then using navigating arrows go to submenu F7 d_Li e Insert sinker s volume that is specified on its hook accuracy of the volume depends on the value given on the hook 35 JE 00200000 Sd gt uS V I Fig 34 Density determining procedure of liquid After inserting sinker s volume and storing the data in balance s memory using Print Enter key balance s display indicates a command Load A and zero if the indication is other than zero 36 press ESC ZEROTARE key e Hang the sinker on the density kit s basis and determine its mass in the air Fig 35 Means of hanging the
19. n any printer or sending them to a computer for further processing 2 PRINCIPLE OF DENSITY MEASUREMENT 2 1 DEFINITIONS e Density Density refers to a ratio between sample mass and its volume M 3 sample density M sample mass V sample volume Relative gravity Relative gravity refers to the ratio of sample density to the density of pure water with the same volume as that of the sample at 4 C and at pressure 1013 25 hPa M 5 V X S relative gravity M sample mass V volume density of water at 4 C at pressure 1013 25 hPa e Archimedes Principle A body immersed in a liquid undergoes an apparent loss in weight equal to the weight of the fluid it displaces e Density of solid The density of solid can be obtained using the following formula sample density sample mass in the air sample mass in liquid 6 density of liquid 00200 Density of liquid The density of liquid can be obtained using the following formula A B d p V T density of liquid sinker mass in the air sinker mass in liquid sinker s volume density of air max 0 001 g cm 2 2 SOURCE OF MEASUREMENT ERRORS The software of balances calculates and indicates on balance s digital display the result of density measurement with the accuracy of 0 001 Bear mind that the measurement result be burdened with additional errors Error of mass measurement Sam
20. on 22 23 8 6 DENSITY MEASUREMENT OF LIQUID Assemble the density determining kit for liquid Fig 16 Balance PS series with assembled density determining kit for liquid Procedure 1 Disassemble the weighing pan 2 Assemble the density kit in accordance with point 7 of this user manual 3 If the display indicates command null use supplementary weights of the density kit 4 Press ZERO TARE key to set the display indication to zero 5 Pour tested liquid into the beaker place the beaker next to the balance amount of liquid should be fixed in a way that the sinker is completely immersed in the liquid 24 Preparations for measurement process are completed now Weighing 1347314 Units Setup E Fig 17 Tarring a balance Measurements start has to be carried out in accordance with description on fig 8 or fig 9 Sinker s volume has to be inserted to balance s memory in field sinker volume area volume see draw 6 Move the marker to RUN and start the procedure 15 03 04 Density 13 57 20 Weighing in the air Place a sinker Enter 100 0 Fig 18 Density of liquid the first step in the procedure 25 Fig 19 Weighing in the air Hang the sinker on the hook As the weighing result is stabilized press Enter key Density 13 57 20 Weighing in the air Place a sinker Enter 23 446 o 100 4 Fig 20 Wei
21. pany prepared software which improves process of density measurement Traditional method of density measurement requires an operator to carry out laborious measurement toilsome measurements In effect the result of density measurement can be burdened with set of calculation and statistical errors while time required to determine density of solids or liquids or rather long In case of applying balances with function of density measurement of solids or liquids the procedure can be simplified and quickened Time which user needs to receive final result is short because all calculations are performed by balance s software User activity is limited to manual processes such as Operation of balance s keyboard Loading a sample onto weighing pans Hanging sinker The density of solids and liquids can be determined using a dedicated measuring kit It is part of the additional equipment of laboratory balances The density measuring software offers the following highlights e simplicity of operation all activities are presented on the display to a user e reliability all calculations are carried out by the software automatically e fast data processing user receives the result after determining sample mass in liquid or sinker in the liquid e reliable data processing before each measurement the indication is set to zero Thus measurement results are reliable and indicate actual mass e printing results o
22. ple mass in the air and in the water is obtained using a balance with accuracy 0 001g Air Buoyancy The air buoyancy is determined using a formula 0 0012932 X mC 1 0 0036728 xt 1013 25 t air temperature C p air pressure Liquid temperature When determining density of solids the density of liquid in which the measurement is carried out changes according to its temperature The density of liquid H2O and C H4OH is accepted by the software in accordance with tables stored balance s 6 processor depending on temperature of liquid directly before the measurement Density of other liquid is inserted to balance s memory by a user before density measurement Caution Corrections of density of distilled water and alcohol are noted by the balance software automatically e Sinker volume It is given on sinker s hanger and it is expressed in cm e Surface tension During density measurement of a solid the weighing pan is subject to a force surface tension which interacts between pan s wire and liquid surface During density measurement the wire with 0 2 mm in diameter creates a force of approximately 1 mg The force practically does not influence the measurement result e Air bubbles The buoyancy of an air bubble of 1 mm in diameter is about 0 5 mg Tack of air bubbles depends on the sample s shape and type of material Air bubbles much easier tack to surfaces covered with gr
23. r to keep liquid temperature inside the beaker stable during measuring process the density of liquid depends on the temperature its change may affect 28 measuring reliability completed now Procedure F6d Co Select one of the 3 available Preparations for measurement process are Press Mode key then use navigating arrows to select submenu liquid types H20 distilled water C2H5OH spirit 100 0 1 in temp 20 C or Another other liquid with known density e for H20 and C2H50H give liquid temperature value and follow instructions given on below figure HOO ye AS 25 A 000 ne gt MIL c re ven co LeHSUH B Fig 25 Density determining procedure of solids selected liquid is H20 29 e For selected liquid Another give liquid s density and follow the instructions given on below figure HE A 52 Aes Jol ad 000 0000 15 00040250 9 2000 Fig 26 Density determining procedure of solids selected liquid is Another After selecting liquid type the balance displays command Load A and zero indication if indication on balance s display is other than zero press ESC ZEROTARE key Then load the sample on the top weighing of the density kit and weigh the sample in the air 30 sample on the Fig 27 Sample loaded onto the top wei
24. sinker e When balance indicates stable measurement marker press Print Enter key e the display indicates a command Load L place the beaker with tested liquid on the basis and hang the sinker on the hook The sinker has to be fully immersed in the tested liquid e Then determine the density measurement result by pressing Print Enter key the balance indicates the density of tested liquid in g cm 253752 CAUTION Pay special attention to presence of air bubbles during measuring process If air bubbles tack to sinker s surface during measuring process they may be a source of unreliable measurements To repeat inserting sinker s volume procedure press F key 2 JCS y 9 3 g dion 3 5 Fig 36 Repeated entering the volume of sinker To return to weighing mode press Mode key and then Zero Tare key 25 4 1 lt 0000 0 Fig 37 Return to weighing In order to once again weigh the sinker in the air press Units key f jene Lofd A Lofd A Fig 38 Method of moving to repeated weighing process 38 10 DENSITY MEASUREMENT BALANCES AS SERIES 10 1 DENSITY FUNCTION IN THE BALANCE MENU 2 0000 P bfc Fes Fi filo Prcf F5 Prcb Fb do Fl 41 Fig 39 Balances menu density determination mode p quoe 39 10 2 DENSITY MEASUREMENT SOLIDS Procedure Press MODE key then by pressing UNIT
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