11. Procedure
11.1 Attach the cleaned cell to the meter as shown in Fig. 2.
11.1.1 Depress the ZERO switch, the digital reading should indicate the same value recorded in 10.1.2.
11.1.2 Depress the CAL switch, the digital reading should indicate 1000 +/- 5.
11.1.3 Rinse the cleaned cell three times with the sample, empty completely, then fill the outer chamber until sample overflows into the center receptacle. (Alternatively, the outer chamber can be filled by pipet with 100 mL of sample).
NOTE 7 - Allow static charges generated by handling the sample to dissipate. If the sample is expected to have a conductivity below 1 pS/m, allow 15 min waiting time before reading.
11.1.4 If the sample conductivity is known, select the corresponding range position. When the conductivity is unknown, first check the fuel on a 2000 pS/m range position, then read in a lower scale if appropriate.
11.1.5 Using the AUTO mode, depress the appropriate RANGE switch. In the AUTO mode, the reading is stabilized after 3 s and held on display for 9 s. Record the pS/m value.
11.1.6 Repeat readings can be taken after a 1 min delay.
11.1.7 Remove the cell cover and measure the temperature of the test samples to the nearest 1°C with a clean thermometer.
12. Calculation
12.1 If the zero error in 10.1.2 was greater than +/- 0.01 and the zero of the meter was not adjusted, the readings should be corrected by subtracting any positive zero error or adding any negative zero error. For example:
