
4.3.10
Replacing
the
Electric
Immersion
Heating
Elements
NOTE:
With
wires
disconnected,
the
resistance
of
the
heaters
should
be
between
16.7
and
19.4
Ohms.
1.
Turn
OFF
the
SMU,
disconnect
power,
and
ensure
pressure
in
the
chamber
and
jacket
is
at
0
psig.
2.
Remove
Back
Lower
Panel,
Heater
Assembly
Cover,
and
Heater
Block
Enclosure.
Then
disconnect
the
3
incoming
heater
wires,
noting
the
exact
connections
of
each
wire.
Disconnect
the
white
RTD
Connector.
(Reference
Section
4.3.17
‐
Removing
Back
Lower
Panel
and
Heater
Assembly
Cover)
3.
Remove
the
8
white
heater
stud
caps
(S/N’s
after
AFS
‐
0340),
nuts,
and
washers
from
the
studs
and
pull
the
heater
plate
from
the
jacket.
The
gasket
should
be
removed
and
discarded.
4.
If
the
middle
heater
is
being
replaced,
remove
the
RTD’s
and
set
aside
to
protect
them.
Transfer
the
springs
to
the
new
heater
element
by
unwinding/winding
them
on
the
element.
5.
Loosen
the
2
nuts
on
the
compression
fitting
for
the
heater
to
be
replaced.
Slide
the
heating
element
from
the
plate
and
discard
the
element,
nut,
and
ferrule
(which
should
still
be
crimped
to
the
element).
6.
Remove
the
heater
support
that
is
clipped
onto
the
end
of
the
heating
element
(this
clip
supports
the
end
of
the
heating
element
and
prevents
it
from
resting
on
the
surface
of
the
jacket).
7.
Install
the
heater
support
onto
the
end
of
the
replacement
heating
element.
Ensure
Teflon
screw
is
installed
snugly
into
the
heater
support.
RTD’s
89
Содержание P2131
Страница 121: ... THIS PAGE INTENTIONALLY LEFT BLANK 115 ...
Страница 130: ...SECTION A APPENDIX 124 ...
Страница 131: ...A 1 Swagelok Fitting Installation Instructions 125 ...
Страница 135: ...A 2 PLC Data Sheet 129 ...
Страница 141: ...A 3 VERIFY Product Information 135 ...
Страница 147: ...A 4 WRS Pump Information 141 ...
Страница 158: ...A 5 Vacuum Leak Test Troubleshooting Guide 152 ...