D3241_9 (18) 04-2018
0 (0 Likes / 0 Dislikes)
Clean the inside surface
of the heater test section
using a nylon brush saturated
with dry solvent material
to remove all deposits.
Check the heater tube to be used
in the test for surface defects
and straightness, referring
to procedure in A1.10
of the written standard.
Be careful also to avoid
scratching tube shoulder
during the examination
since the tube shoulder must
be smooth to ensure
a seal under the flow
conditions of the test.
Assemble the heater
section using new items--
visually checked heater tube,
test filter, and three O-rings.
Inspect insulators to be
sure they are undamaged.
Heater tubes must not be reused.
Tests indicate that magnesium
migrates to the heater tube
surface under normal
test conditions.
Surface magnesium may
reduce adhesion of deposits
to reused heater tube.
During assembly
of heater section,
handle tube carefully so as not
to touch center part of tube.
If center of heater
tube is touched,
reject the tube, since
the contaminated surface
may affect the deposit-forming
characteristics of the tube.
Perform the following steps
in the order shown prior
to running a subsequent test.
It is assumed that the
apparatus has been disassembled
from previous test.
See annex A5 of the written
standard or appropriate user
manual for assembly and
disassembly details.
Inspect and clean components
that contact test sample.
And replace any seals that
are faulty or suspect,
especially the
lip seal on piston
and O-rings on the
reservoir cover, lines,
and prefilter cover.
Install prepared heater
section as described in 9.1.1
through 9.1.4 of the
written standard.
Assemble prefilter with
new element and install.
Check thermocouple for
correct reference position.
Then lower into standard
operating position.
On models 230 and 240, make
sure the water beaker is empty.