Step 1. Fill cell in accordance with para- 

 graph 1-21. 



Step 2. Close off air relief inlet or fill knob 

 and let pump run. 



Step 3. While continuing to pump, visually 

 examme the entire cell. Any air leak will be 

 located and pinpointed quickly. If a leak is not 

 visible, the bubbles are caused by condition b 

 or c which will be discussed below. 



a. If an air leak is visible proceed as follows : 



(1) Stopcock area air leak. Remove panel 

 screws (A) to allow access to cell, then remove 

 the retaining plate (B), and pull stopcock (O) 

 out of housing. Clean stopcock with lab tissue, 

 and clean out housing in the same manner. Re- 

 coat stopcock with a thin coating of Dow-Corn- 

 ing high vacuum grease, Fisher high vacuum 

 Cello-Grease or equivalent. Replace stopcock 

 and retaining plate. Should the stopcock still 

 leak air, apply a heavier coat of grease. If this 

 does not correct the situation, the stopcock is 

 probably scored and should be replaced. 



(2) Toroid mounting stud area air leak. 



(a) Remove the six screws (E) and re- 

 move cell bowl (F) . CAUTION : Use extreme 

 care during disa-ssemily to avoid damage to 

 the platinum, thermometer assembly ( the dark 

 prohe behind the toroid). Its replacement cost 

 is approximately $400.00. 



(b) Observe the above caution and back 

 off the toroid mounting nut (G) all the way 

 up to the top of the toroid mounting stud 

 (H). This will allow the toroid assembly (I) 

 to be lowered about % to 1 inch. Lower the 

 toroid and apply a heavy coating of vacuum 

 grease on the small black sleeve of the toroid 

 mounting stud. Push the toroid back to its 

 secured position, tighten down the nut on the 

 mounting stud making sure that the toroid is 

 about i/s inch away from the platinum ther- 

 mometer. Clean off the excess grease that 

 shows on the toroid or the underside of the 

 Incite toroid mounting. Clean and lightly re- 

 coat the joint between cell bowl with vacuum 

 grease, taking care not to get any grease on the 

 mside of the cell. Reassemble tlie cell with the 

 six mounting screws previously removed dur- 

 ing disassembly, making sure the stopcock 

 handle is to the right. CAUTION : Use care 

 when handling platinum thermometer. 



(3) Air leak between cell bowl and cell top. 

 Disassemble the cell bowl by removing the six 

 mounting screws. Carefully remove the cell 

 bowl. Wipe off all old grease around the joint 

 with lab tissue and lightly grease the joint with 

 vacuum grease. Wipe off exc«ss grease on the in- 

 side of the cell bowl or bowl top. Reassemble the 

 cell with the six mounting screws. 



(4) Air leak around stirrer and stirrer bear- 

 ing housing. The plexiglass housing (J) which 

 contains the stirrer bearing has been Imown to 

 come apart, causing an air leak. If this occurs, 



1-18 



remove the cell bowl. Remove the stirrer-motor 

 belt and stirrer pulley by loosening the set 

 screws on the pulley. Lower the toroid assembly 

 and swing it forward about 90°. Pull the stirrer 

 shaft through the bearing from the bottom. Re- 

 glue the stirrer housing with Dupont Duco or 

 similar cement. Do not use Epoxy cement. Apply 

 a thin coat of Dow-Corning No. 44 ball-bearing 

 grease to the stirrer shaft and reinsert into the 

 stirrer bearing from the bottom. Reinstall the 

 pulley, secure the set screws, and reattach the 

 drive belt from the stirrer-motor to the stirrer. 

 Make sure the pulley exerts a small amount of 

 pressure on the bearing top to prevent any verti- 

 cal movement of the stirrer. Realine and secure 

 the toroid assembly and reattach the cell bowl 

 with the six mounting screws. Allow the glue 

 to set for at least 12 hours before pumping any 

 water into the cell bowl. 



(5) Air leak around the platinum thermom- 

 eter assembly. Since the platinum thermometer 

 is so delicate, it is advisable not to disassemble 

 in the field. Should an air leak develop where 

 the thermometer is joined to the cell top, apply 

 a heavy coat of vacuum grease around the four 

 mounting screws, the edge of the light green 

 mounting plate, and the top of the shaft of the 

 thermometer itself. Return to Oceanographic 

 Office for final repair. 



( 6 ) Air leaks caused by hairline cracks in the 

 cell bowl or cell top. Temporarily fill cracks in 

 the cell bowl with vacuum grease from the out- 

 side. Return to the Oceanographic Office for 

 final repair. Do not use beesivax, core wax, pipe 

 dope, or similar expedients for this type repair. 



b. Air Entrapment. 



(1) Toroid assembly inside sample cell is too 

 close to platinum thermometer. The space be- 

 tween the toroid assembly and the platinum 

 thermometer should be i/s of an inch. To obtain 

 this spacing, back off the toroid mounting nut 

 about one turn or until the threaded toroid 

 mounting stud swings free with a slight pressure 

 from the fingers. Facing the right side of the 

 sample cell, space the toroid approximately y^ 

 iiich from the platinum thermometer, and 

 tighten the mounting nut, while holding the 

 toroid mounting stud tightly with the fingers 

 at the same time. 



(2) Air is being entrapped around stopcock 

 assembly. 



(a) Make sure stopcock holes are alined 

 properly with the stopcock housing holes 

 when drawing sample into the cell. . 



(b) Remove any excess grease visibly 

 showing in the stopcock holes or stopcock 

 housing holes. 



(3) Air is being entrapped between the front 

 of the toroid and inside the front of the cell 

 bowl. Realine the toroid as described in b(l) 

 above. 



(4) Air is being entrapped at the bottom or 



