Table 1-3. Abstract of Temperature Compensation 

 Dial Settings table 



Set temperature 

 compensation 



For temperature °C. reading Left dial Right dial 



16.00 4 6 



18.00 5 4 



20.00 6 3 



22.00 7 2 



24.00 8 



26.00 8 7 



Table with Temperature Compensation Dial Settings 

 for temperatures from 6° to 40° C. is furnished with 

 each salinometer 



Step 9. Set the Function Selector knob to Sa- 

 linity, refill the sample cell, set the Stir Fill 

 switch to Stir, and adjust the Standardization 

 dials until the null indicator needle is on scale. 

 Then turn the Stir Fill switch to Off, drain the 

 cell, refill again, stir the sample, and finally 

 zero the null indicator needle with the Stand- 

 ardization dials. Turn the Stir Fill switch to 

 Off, the three-way valve to Fill, and let the 

 sample drain back into the bottle of standard 

 sea water. Refill the sample cell once again and 

 make sure the Standardization dial settings 

 zero the null indicator meter. 



Step 10. Record the Standardization dial set- 

 tings in the Std. Dial Setting block. 



2. Salinity Sample Runs. — Salinity samples 

 should be within one or two degrees centigrade 

 of the sample temperature obtained during 

 standardization (Step 7 above) when they are 

 analyzed, and the steps listed below should be 

 followed carefully as the salinity samples are 

 run: 



Step 1. Open the first sample bottle, turn all 

 Conductivity Ratio dials to zero, fill the sample 

 cell full, and set the Stir Fill switch to Stir to 

 rinse the cell with the sample. Wliile rinsing, 

 adjust the Conductivity Ratio dials to obtain an 

 on scale reading on the null indicator meter. 

 DO NOT CHANGE THE STANDARDIZA- 

 TION DIALS. 



Step 2. Drain the cell into the waste bottle, 

 refill the cell, set the Stir Fill switch to Stir, 

 and adjust the Conductivity Ratio dials to ob- 

 tain a zero reading on the null indicator meter ; 

 then, stop the stirrer and record the Conduc- 

 tivity Ratio dial settings in the Conductivity 

 Ratio 1st Determ. column. 



Step. 3. Immediately drain the cell either 

 into the waste bottle or back into the sample 

 bottle, depending on the amount of sample avail- 

 able. Refill the cell, stir, and adjust the Conduc- 

 tivity Ratio dials to obtain a zero reading on 

 the null indicator meter. Stop the stirrer, 

 record the dial settings in the Condiictivity 

 Ratio 2nd Determ. column. 



Step 4. If the 1st and 2nd Determ. conduc- 

 tivity ratios are within ±.00010, go on to step 



1-16 



5. If they do not agree within the above limits, 

 rerun a third or fourth sample until acceptable 

 values are obtained. 



Step 5. Recap the sample bottle, and return 

 it to the salinity sample case. Samples are not 

 discarded until salinity analysis data are com- 

 puted and verified. 



Step 6. Repeat steps 2 through 7 for other 

 salinity samples (the maximum number of 

 samples run at one time usually is 24). 



Step 7. After the salinity samples have been 

 run, analyze a sample from the standard sea 

 water used for the standardization; this time, 

 however, adjust the Conductivity Ratio dials 

 to obtain a zero reading on the null indicator. 

 Enter the dial settings in Conductivity Ratio 

 column(s), and write Std and the number 2 

 in Bottle Number column. The second stand- 

 ardization run is most important because the 

 salinometer usually has a tendency to drift. 



3. Conversion of Conductivity Ratio to 

 Salinity. — Average conductivity ratios are com- 

 puted and entered in the Conductivity Ratio 

 Average column, and then converted to nominal 

 salinity %o by means of the Conversion of Con- 

 ductivity Ratio to Salinity table (see table 1-2) . 

 Determine salinity %o to the nearest thousandth 

 by interpolation, and enter in the Nominal 

 Salinity %^ column. 



4. Computation of Drift Corrections. — After 

 the conductivity ratio is obtained by rerunning 

 the standard (Std2), the drift that occurred in 

 the salinometer can be determined. 



Step 1. Determine the difference between the 

 nominal salinity %„ of Stdl and Std2 and enter 

 this value in the Drift column of Std2 line. If 

 Stdl>Std2 the drift correction is plus; if 

 Stdl<Std2 the drift correction is minus. 



Step 2. Distribute the drift corrections pro- 

 portionally between the salinity samples run, 

 beginning with zero (or minimum) drift cor- 

 rection for the first sample run after standardi- 

 zation (Stdl) and increasing to maximum drift 

 correction at the last sample run before rerun- 

 ning the standard Std2. Enter in Drift column. 



An excessive drift may require a standardiza- 

 tion following the running of 12 salinity sam- 

 ples. Drift can be reduced by maintaining a 

 constant temperature in the laboratory and by 

 analyzing the series of salinity samples in the 

 minimum time consistent with good techniques. 



5. Computation of Temperature Correc- 

 tions. — Sample temperatures have an effect on 

 salinity values. This temperature correction is 

 determined by using the Temperature Correc- 

 tions to Salinity table (see table I^). Using 

 sample temperature {Sample Temp, block) and 

 the nominal salinity %o for each sample, deter- 

 mine the temperature correction and enter the 

 value in the Temp, column. It is most important 

 that temperatures of the samples vary no more 

 than one or two degrees celsius. 



Change 1—1970 



