20 / 192
Stra
i
g
ht Thermocou ple
AssemblleC"-,
$
Ceramic Protection Tubes'i
f
Easy
to
Order-
1
-
State quantity
2 -
Specify
the
part number
(ours
or
competitive)
3 -
Specify
the
length
.
multiples
of 6" (152.4
mm)
are
stocked
4
-
Add
letters
for
mounting attachments
5
-
For Double
Element
Assembly add
D
to
the
to the
part number. (24S4D-P11F-12-SH)
Example:
The part number describes the thermocouple giving the
gauge,
type
of wire, construction,
tube
length
and
mounting
device,
if
any.
The
part num-
ber
24S4-P11F-24-SH
signifies
a 24
gauge, Type
S
complete assembly,
11116"
O.D.
Mullite
tube,24"
long, a112" x314" steel
fitting,
and a standard weatherproof
aluminum
head.
Other combinations of thermocouples and tubes can be
speci-
fied depending
on
your
application.
!
No1re:
tf
you
would
like
to order
a
Type
B,
or
Type
R
assembly,
iust
substitute
the S
with
a B, or
R
in
the
part numbers listed
on
this
page.
Alumina
Alumina has
a
maximum service temperature of 3450"F
(1
900'C)
in both oxidizing
and
reducing atmospheres.
Alumina is considered
to
have better mechanical strength
an chemical resitance than
mullite.
Alumina tubes also
have excellent
abraison resistance.
Secondary
metal
tubes can
be added
for
additional
protection from
mechanical
damage,
Alumina tubes are
considered
gas
tight
so
they make excellent primary protection
tubes.
All
tubes, which
are
used in horizontal installations and at
elevated temperatures, should
be suppofted.
Alumina
tubes can
be
used for primary protection tubes on
noble
metal (platinum based)
thermocouples.
Alumina tubes
have
a
low
silica
content so they will
not
contaminate
plati
num
thermocouple elements.
Alumina
99.8 % Aluminum Oxide
Construction-
2
Single
tube,
O.D.
3/8"
(9.Smm)
3/8"
NPT steel nipple
2112"
long
.
24
24S.APO6N.--SH
Alumina
99.8
% Aluminum Oxide
Construction-
rt_F
3
Single
tube,
O.D
.
11116"
(17.5mm)
112"
x314"
NPT steel fitting.
24
24S4.AP11
F.-.SH
Alumina
99.8
% Aluminum Oxide
Construction-
4
Single
tube,
O.D
.
11116)
(17.5mm
314"
NPT steel nipple
2
112"
long.
24
2454-AP11 N-.-SH
Mullite
Mullite has
a
maximum service temperature of
2900'F
(1590'C).
lt
is
considered
to be
better than Alumina for
thermal
shock resistance.
Mullite tubes should
be
used
with care, since they have
poor
mechanical shock
resistance.
Secondary metal tubes can
be added
for
protection
from
mechanical
damage.
Mullite tubes are
considered
gas tight
at
high
temperatures.
All tubes,
which
are
used in horizontal installations and at elevated
temperatures, should
be supported.
Mullite tubes
should
not
be
used
for
primary protection tubes on noble metal
(platinum based) thermocouples if the temperature
will
exceed
2200'
F
(1200'C).
Above these temperatures
the
silica
in the mullite can contaminate the platinum element
if there
is
not enough
good air
circulation inside the
tube.
Mullite
Porcelain
63.5 % Aluminum Oxide, balance
Silicon
Dioxide
Construction-
|
Single
tube,
O.D.
3/8" (9.Smm)
With plug and jack.
3/8"
NPT steel hex
nipple 1
112"
long
24
2454-P06HXPJ-RS3-*
Mullite
Porcelain
63.5 % Aluminum Oxide, balance
Silicon
Dioxide
construction-
,n
r.-
.--\
5
Single
tube,
O.D.
3/8"
(9.5mm)
3/8"
NPT alloy
600
nipple sleeve
Specifu sleeve length
(Z)
24 2454-P06N9-Z-*-SH
Mullite Porcelain
63.5 % Aluminum Oxide, balance
Silicon
Dioxide
Construction-
(,
Single
tube,
O.D.
11116)
(1
7.5mm
112"
x314"
NPT steel fittinq.
24
24s,4-P11
F-*-SH
Mullite Porcelain
63.5 % Aluminum Oxide, balance
Silicon
Dioxide
Construction-
7
Single tube,
O.D
.
11116"
(17.5mm) with alloy sleeve
314"
NPT steel nipple
2
112"
long.
24
2454-P11 N-*-SH
.
Add
the required thermocouple length
(.)
as the
suffix.
Multiples of
6"
(152.4mm)
are
in stock.
Page 20