GAS PARTITIONER FLOW DIAGRAM 



CDHEaiON-UNIT 



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Figure J-IS. Flow path of the carrier gas through the gas partltloner system. 



gas ; and' Peak 3, the N2 gas. The area under each 

 peak represents the quantity of gas in the 

 sample. 



7. The integrator pen on the recorder 

 graphically integrates the area under each peak 

 as the recorder pen traces the curve. 



J-22 Analyzing Oxygen Samples. — After 

 the thermal stabilizer in the partitioner has been 

 turned on for about 8 hours, O2 sample analysis 

 can be performed. Oceanographic Log Sheet- 

 CC NAVOCEANO-EXP-3167/3A (9-63) is 

 used for recording the results of the analysis of 

 O2 samples by gas chromatography (fig. J-14) . 

 Ship's name, cruise number, station number, 

 serial nimiber, and sample bottle number are 

 taken from Oceanographic Log Sheet-A. 



Step 1. About 30 minutes prior to sample 

 analysis, the He gas flow should be turned on and 

 adjusted to 12 psi. 



Step 2. Turn the four- way valve to Chamber 

 position, and the automatic sampling valve to 

 Syphon position. 



Step 3. Place the end of tube (G) well down 

 in a bottle of sea water from a discarded salinity 

 sample, and start syphoning by depressing the 

 rubber bulb. 



Step 4. Turn the automatic sampling valve to 

 Fill position when the syphoned water begins to 



flow into tube (F). This will cause the water in 

 the sample loop to be moved into the glass 

 sampling chamber, where the helium gas will 

 strip it of any gases. It is important to have sev- 

 eral centimeters of stripped water in the 

 sampling chamber before a sample is injected 

 into the system for analysis. 



Step 5. Set the sensitivity attenuator knob 

 and the cell current on the gas partitioner as 

 follows: On the Fisher Gas Partitioner, set 

 sensitivity at 2 percent and cell current at 7 ma 

 (Hi) ; on the Fisher-Hamilton Gas Partitioner, 

 set sensitivity at 8 (I21/2 percent) and cell 

 current at 250 ma. 



It is important to operate the gas partitioner 

 at a sensitivity that will cause the recorder to 

 utilize the maximum width of the chart paper 

 since this will give a clearer record and more 

 accurate calculations. The rule is : Set the sensi- 

 tivity as high as possible and still keep the 

 recording pen on scale. 



To determine the sensitivity for operation of 

 the partitioner, analyze a surface sea water 

 sample with the sensitivity set at 50 percent, and 

 observe the recorded peaks on the Chromato- 

 gram. If the composite and No peaks are on 

 scale and the O2 peak is between one-half and 

 full scale, the 50 percent sensitivity is satisfac- 

 tory. If, however, the dissolved gas content of 



J-17 



