The surface density of soluble salts can be tested by using the Elcometer 135B Bresle Patch together with a conductivity meter, test strips which change colour or titration tubes. Outlined below is the procedure for testing the surface with the Elcometer 135B and a conductivity meter.
Please note that this is intended as a guide only. The relevant ISO standard should be referred to for precise instructions.
- Remove the protective paper and the square in the centre of the patch.
- Attach the Elcometer 135B Bresle Patch to a dry and clean test surface.
- Measure a given amount of distilled water into a measuring tube or beaker, clean the syringe using this water.
- Using a conductivity meter, measure the electrical conductivity of the distilled water in the measuring tube.
- Using the water in the measuring tube or beaker, inject a given amount into the Bresle Patch which is adhered to the test surface.
- Pump the water back and forth between the syringe and the patch, to dissolve the soluble salts on the test surface.
- Remove all the distilled water from the patch using the syringe and return it to the measuring tube or beaker.
- Re-measure the electrical conductivity of the water
