Elcometer 138/2 User Manual page 4

3 TEST PROCEDURE (continued)
2 Apply the patch to the surface pressing
firmly around the perimeter of the patch to
ensure a complete seal and remove the
clear protective film cover using the
orange tab.
3 Pour approximately 3ml of pure water into
the beaker, by eye. Fit a needle into the
syringe and suck 3ml into the syringe.
Throw away the remaining water in the
beaker, do not put the pure water back into
the bottle.
4 Insert the syringe into the patch
through the spongy foam perimeter at
an angle of approximately 30° to the
test surface so that it passes through
the foam into the compartment formed
by the elastomer film and the test
surface. If the patch is positioned in a
difficult position bend the needle as
required.
5 Inject the pure water into the patch.
Do not remove the needle.
If necessary, any air can be evacuated

into the syringe and allowed to stay above
the water in the syringe. Take care not to
re-insert the air during steps 6 and 7.
6 During a suitable period of time ,
without removing the needle, suck and
re-inject the solution at least four
c
times .
7 At the end of the period, extract as
much solution as possible and remove
the syringe from the patch .
8 Transfer the contents of the syringe
into the beaker.
9 Test the solution for chloride, iron or
pH as required - see Sections 3.4, 3.5
and 3.6.
a
Pure water is available from Elcometer or your local Elcometer supplier, see Section 5 'Spares &
Accessories on page en-7.
b
On un-pitted blast-cleaned areas, a period of 10 minutes has been found to be satisfactory, though this
time should be agreed by the interested parties.
c
During steps 6 and 7, it is essential that no solution is lost. If any solution is lost, the test shall be rejected.
en-3
R
a
b
c
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