Document GmO761rbja6xykewO76Lw8xLm

' Date: 11/17/43 Mat-aal: Aroclor By: HOHiDBH . ijf' Ref: Test: Dielectric Constant Method No. 10,119-43 |pnt: B No. 246-012 Page: 1 1. Clean the electrodes scrupulously as follows before each sample is tested, being careful not to touch any part except the con tact terminals. (When the electrodes lose their high polish, deliver to the chief analytical chemist, who will consider hav ing them replated.) a. Scrub thoroughly with hot tap water and trisodium phosphate using the brush reserved exclusively for the purpose. b. Rinse thoroughly with hot tap water. c. Next rinse thoroughly with distilled water. d. Dry the electrodes in the special oven at 120C for 1 hr. standing erect on a clean sheet of lintless paper. 2. Clean a 1000-mli beaker, the glass electrode spacer, and a -10 to 220C. thermometer as follows before each sample is tested: a. Scrub thoroughly with hot tap water and trisodium phosphate using the brush reserved exclusively for the purpose. F. 221 Monsanto Chemical Company ANALYTICAL LABORATORY DSW 330922 STLCOPCB4077563 ' Date: By: Ref: H/17/43 Mat#sal: Aroclor H0H:DBH Test: Dielectric Constant JtMethod No. 10,119-43 : B No. 246-012 Page: 2 b. Rinse thoroughly with hot tap water. ( c. Place the spacer and the thermometer in the beaker, fill with chromic acid cleaning solution (ca. 6oC.), and allow to stand 15 min. Discard the cleaning solution after it becomes green. d. Rinse thoroughly with hot tap water. et Finally rinse thoroughly with distilled water and drain well. f. Dry tho clootrode-s in the special oven at 120C. for 1 hr* standing erect on a clean sheet of lintless paper. 3. Remove the apparatus from the oven. Immediately place the spacer in the bottom of the beaker, put the two electrodes in the spaoer grooves, and the thermometer outside the outer electrode. 4. Place the beaker in the electric heater which has also been preheated. - 5. Balance the dielectric constant apparatus as follows: f. 221 Monsanto Chemical Company ANALYTICAL LABORATORY DSW 330923 STLCOPCB4077564 * Date: 11/17/43 By: HOH: DBH Ref: Mate^l: Aroclor v3 Test: Dielectric Constant Method No. 10,119"43 B No. 246--012 Page: 3 a. Allow electrode leads to hang free. , b. Close double-pole, single-throw switch. c. Turn toggle switch on amplifier to "On" position. d. Turn frequency dial to "1000 e. Turn amplifier volume dial to give.a volume of sound as experience dictates. f. Adjust precision condenser to 1600 mmf. g. Adjust variable condenser to a null point, using the re sistance box if necessary. 6. Connect the red lead of the dielectric constant set to the inner eleotrode end fthe black to the outer electrode. 7. Adjust the precision condenser to a second null point and read (+ 0.5 mmf.). 8 F. 221 Pour a sufficient quantity of preheated sample (97 2C.) to Monsanto Chemical Company ANALYTICAL LABORATORY DSW 330924 STLCOPCB4077565 Date: ll/l7/43 Majggal: By: HOHiDBH I# Aroclor Method No. 10,119-43 >t: B No. 246-012 Ref:________________ Test: Dielectric Constant_____ Page: 4___________ cover the electrodes l/2 In. 9. Stir slowly. Vvhen the sample reaches 100.0 + 0.5C., remove the thermometer and check the electrodes to see that they are properly spaced. 10* Immediately rebalance the precision condenser to a null point end read (+ 0.5 mmf.). 11. Next determine resistivity (Method No. 10,120-43) if required. Calculg.tiQaa: 1) From the following chart convert the precision condenser readings to micromicrofarads: F. 221 Monsanto Chemical Company ANALYTICAL LABORATORY DSW 330921 STLCOPCB4077566 S.*. ' Date: II/17/43 By: H0H:DBH Ref: WMatdal: Aroclor Test: Dielectric Constant M-sthod No. 10,119-43 ! At: B No. 246-012 Page: 5_________ ' CALIBRATION DATA GENERAL RADIO COMPANY TYPE 222 L PRECISION CONDENSER (SERIAL NO. 1189) Scale Reading Divisions 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 F. 221 Capacitance MMF. Scale Reading Pivi slone 49 57 8 101 43 159 48 218 59 277 59 58 335 La 396 n 455 59 6w0 515 60 575 635 695 60 60 60 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 Monsanto Chemical Company ANALYTICAL LABORATORY Capacitance _____ ML------ 755 815 875 935 995 1055 1116 1176 1237 1297 1358 1418 1468 60 60 60 60 60 60 61 60 6l 60 &L 60 50 SW 330979 STLCOPCB4077567 <r" ' ' Date: H/17/43 By: HOHlDBE Ref: Mat&l: U Aroclor Test: Dielectric Constant Msfhod No. 10,119-43 |pt: B No. 246-012 Page: 6__________________ , 2) Dielectric Constant = -935. ( 935 - capacity with air The method is accurate to 0.0$. f Report the result to the nearest 0.01. F. 221 Monsanto Chemical Company ANALYTICAL LABORATORY DSW 330920 STLCOPCB4077568