Elcometer 138 User Manual page 5

3 TEST PROCEDURE: ISO 8502-6 / ISO 8502-9 (continued)
7 At the end of the period, extract as
much solution as possible and remove
the syringe from the patch .
8 Measure the conductivity of the
solution using the Elcometer 138
Conductivity Meter, see Section 5.6 on
page en-11. Inject the sample directly
into the sensor cell. Rinse the sensor
cell several times with the solution to
be measured before taking the
reading.
3.3 AFTER TEST
1 Record the temperature of the solution.
2 Remove the patch from the surface and clean the surface. If
required, any adhesive residue from the patch left on the test
surface can be removed by wiping with a cloth moistened with a
suitable solvent. Ensure that the solvent will not damage the
surface before use.
3 Rinse all components of the test kit, other than the patch, in
fresh, pure water. The components can then be used again.
3.4 TO CALCULATE THE SURFACE DENSITY OF SALTS
Multiply the reading by one of the following factors:
Reading
µS/cm
Note: ISO 8502-9 allows for the measurement of the pure water before testing and
then the subtraction of that value from that obtained in section 3.2 step 8 above.
c
During steps 6 and 7, it is essential that no solution is lost. If any solution is lost, the test shall be rejected.
d
Based on an area of 12.5cm and a volume of 3ml.
www.elcometer.com
c
Surface Density of Salts: Factors
ISO Salt Mix
2
mg/m
µg/cm
x1.2 x0.12
2
IMO PSPC equivalent NaCI
2 2
mg/m
x1.1
R
d
2
µg/cm
x0.11
en-4