Watlow FIREROD Data sheet

WW AA TT LL OO W

Cartridge Heaters

FIREROD®Immersion

FIREROD®immersion heaters
package to 300 W/in2(46.5 W/cm2)
in a compact unit, giving you greater
versatility in designing your heating
system. This design solution is ideal
for replacing large screw-plug
immersion heaters.

Aside from its versatile design, these
heaters come complete with a brass

3

⁄4 inch NPT double threaded screw
plug, which allows you to add
conduit boxes. Also, FIREROD
immersion heaters are sealed at the
lead end with a silicone rubber seal.
Solid copper leads, with silicone
rubber sleeve, are provided for
unconfined wiring. These units are
recommended for immersion in
water or 90+ percent water soluble
solutions.

PPeerrffoorrmmaannccee CCaappaabbiilliittiiees

• Maximum operating temperature

in water to 100°C (212°F) at
atmospheric pressure

• Maximum watt density to

300 W/in2 (46.5 W/cm2)

• Maximum voltage to 480VÅ(ac)

FFeeaattuurreess aanndd BBeenneeffiitts

• Nickel-chromium resistance

wire, precisely centered in the

unit, assures even, efficient
distribution of heat to the sheath.

• Magnesium oxide insulation,

compacted to the proper density,
results in high dielectric strength
and contributes to faster heat-up.

• Incoloy®sheath resists corrosion

from water.

• Metallurgically-bonded

conductor pins overlap the
resistance wire inside the core,
ensuring trouble-free electrical
continuity.

• Lead end with silicone rubber

seal protects the heater against
moisture contamination.

• Optional stainless steel fittings

are available for use in corrosive
applications.

Incoloy®is a registered trademark of
Special Metals Corporation.

s

s

4 in. (100 mm)

No-Heat

6 in. (150 mm) Solid
Pins with Silicone
Rubber Boots

• Horizontal through the wall tank
mounting makes set-up faster.

• 240 and 480VÅ(ac) give
flexibility in wiring the heater for
use in your particular application.

W

Same day shipment on all stock units.

•

Incoloy
Sheath

Nickel-Chromium
Resistance Wire

Magnesium
Oxide Insulation

Double Threaded Brass

3

⁄4 in. NPT-13⁄8 in. long (35 mm)

AApppplliiccaattiioonns

• Plastic reclamation

Food preparation

•

Lab equipment

•

s

®

Cartridge Heaters

111

Cartridge Heaters

FIREROD Immersion

AApppplliiccaattiioonnss aanndd
TTeecchhnniiccaall DDaattaa

The small size and big capacity
of FIREROD cartridge heating units
make them ideal immersion heaters
in cramped quarters. When heating
liquids of low viscosity, FIRERODs
have the high watt density to pack
more heat into tight spots. For water
heating applications a rating of 150

2

to 300 W/in

is recommended.
(Laboratory tests show that under
certain conditions ratings as high as
700 W/in2are safe.) For longer life at
high watt densities:

• The FIREROD unit should be in

the main body of the liquid and
not in a restricted space.

• The FIREROD heater should be

covered with liquid at all times.

• The heater should not be allowed

to cycle on and off too frequently.

• Scale should not form.

When heating viscous liquids, such
as oils, watt densities must be kept
low to prevent carbonization at the
heater sheath. FIREROD cartridges
offer advantages for heating viscous
materials where long life and high
quality outweigh the usual economic
considerations. As in all immersion
applications, scale build-up on the
sheath and sludge on the bottom of
the tank must be carefully controlled
to assure long heater life.

Equipped with smaller threaded
fittings than conventional immersion
heaters, FIRERODs leave room for
more units in the same space.
Replacement of single FIREROD
units in multiheater assemblies is
fast and easy, and avoids discarding
the complete assembly.

Moisture proof seals are available
to give protection from damp
atmospheres outside the tank.

Built for sustained operation at
high temperatures, the FIREROD is
especially valuable in heat-transfer
applications with liquid metals. This
factor alone has made the FIREROD
heater a widely used component in
the development of nuclear power
systems.

Threaded fittings are furnished in
either stainless steel or brass.

®

FIRERODs with Incoloy

or 304
stainless steel sheaths are standard,
but other sheath materials can be
provided. Headers and sheath
material should be suited to the
material being heated.

Consult FIREROD section,
pages 75 to 76 for more
information.

112

Sheath Material Compositions

Sheath Chemical Composition

Material

Stainless Steels

304 0.08

316 0.08

Nickel Alloys

Incoloy®800 0.15/0.6 0.1 19/23 0.75 Bal 1.5 30/35 0.015 1.0 0.15/0.6

➀ Maximum

See application guide for additional sheath material composition.

Al

Co Cr Cu Fe Mn Mo Ni P S Si Ta Ti V W

C

➀

➀

18/20 Bal 2

16/18 Bal 2 ➀2/3 10/14 1

➀

8/12 1

➀

➀

WW AA TT LL OO W

Cartridge Heaters

W

FIREROD Immersion

AApppplliiccaattiioonnss aanndd
TTeecchhnniiccaall DDaattaa

Continued

HHooww ttoo OOrrddeerr:

:

To order stock FIREROD immersion
heaters, specify Watlow code
number and quantity.

For

made-to-orderrunits, please

specify:

• Diameter

• Overall length

• Immersed length

• Heated length

• Watts

Ordering Example: Specify
FIREROD immersion heater 5⁄8 inch

iameter, six inches overall length,

d
immersed length of four inches, and
two inches heated length. The heater
is to be supplied with 1200 watts,
240 volts,
threaded brass fitting, silicone seal
and six inch pins, no leads.

Availability
Stock::Same day shipment

Made-to-Order: Consult Watlow

• Volts

• Threaded fitting material

Overall Approx

Diameter length Watt Density Fittings Net Wt.

in. in. (mm) Volts Watts W/in

5

⁄8 6 1⁄4 (159) 120 500 127 (19.7) Brass 0.58 (0.26) Stock

6 1⁄4 (159) 120 500 127 (19.7) SS 0.58 (0.26) Stock
6 1⁄4 (159) 240 500 127 (19.7) Brass 0.58 (0.26) Stock
6 1⁄4 (159) 240 500 127 (19.7) SS 0.58 (0.26) Stock
6 1⁄4 (159) 120 750 191 (29.6) Brass 0.58 (0.26) Stock

6 1⁄4 (159) 120 750 191 (29.6) SS 0.58 (0.26) Stock
6 1⁄4 (159) 240 750 191 (29.6) Brass 0.58 (0.26) Stock
6 1⁄4 (159) 240 750 191 (29.6) SS 0.58 (0.26) Stock
6 1⁄4 [phone] 254 (39.4) Brass 0.58 (0.26) Stock
6 1⁄4 [phone] 254 (39.4) SS 0.58 (0.26) Stock

6 1⁄4 [phone] 254 (39.4) Brass 0.58 (0.26) Stock
6 1⁄4 (159)
6 3⁄4 [phone] 300 (46.5) Brass 0.60 (0.27) Stock
6 3⁄4 [phone] 300 (46.5) SS 0.60 (0.27) Stock
6 3⁄4 (171)
6 3⁄4 [phone] 300 (46.5) SS 0.60 (0.27) Stock

7 3⁄4 (197)
7 3⁄4 [phone] 291 (45.1) SS 0.66 (0.30) Stock
7 3⁄4 [phone] 291 (45.1) Brass 0.66 (0.30) Stock
7 3⁄4 [phone] 291 (45.1) SS 0.66 (0.30) Stock

8 1⁄2 [phone] 300 (46.5) Brass 0.68 (0.31) Stock
8 1⁄2 (216)
8 1⁄2 [phone] 300 (46.5) Brass 0.68 (0.31) Stock
8 1⁄2 [phone] 300 (46.5) SS 0.68 (0.31) Stock

9 1⁄4 [phone] 300 (46.5) Brass 0.72 (0.33) Stock
9 1⁄4 [phone] 300 (46.5) SS 0.72 (0.33) Stock
9 1⁄4 [phone] 300 (46.5) Brass 0.72 (0.33) Stock
9 1⁄4 (235)

11 [phone] 300 (46.5) Brass 0.80 (0.36) Stock

(279)

11
11 [phone] 300 (46.5) Brass 0.80 (0.36) Stock
11 [phone] 300 (46.5) SS 0.80 (0.36) Stock

240

480

240

240

480

240

1000

1500 300 (46.5) Brass 0.60 (0.27) Stock

2000 291 (45.1) Brass 0.66 (0.30) Stock

2500

3000

4000

2

(W/cm2) Type lbs (kg) Availability Code No.

254 (39.4) SS 0.58 (0.26) Stock

300

300

300

(46.5)

(46.5)

(46.5)

SS 0.68 (0.31) Stock

SS

SS 0.80 (0.36) Stock

0.72 (0.33) Stock

3

⁄4 inch NPT double

F.O.B.: St. Louis, Missouri

LL66EEXX1122AA
LL66EEXX1122BB
LL66EEXX1133AA
LL66EEXX1133BB**
LL66EEXX1144AA

LL66EEXX1144BB
LL66EEXX1155AA
LL66EEXX1155BB
LL66EEXX1166AA
LL66EEXX1166BB

LL66EEXX1177AA
LL66EEXX1177BB
LL66NNXX77AA
LL66NNXX77BB
LL66NNXX88AA
LL66NNXX88BB

LL77NNXX55AA
LL77NNXX55BB
LL77NNXX66AA
LL77NNXX66BB

LL88JJXX1166AA
LL88JJXX1166BB
LL88JJXX1177AA
LL88JJXX1177BB**

LL99EEXX1111AA
LL99EEXX1111BB
LL99EEXX1122AA
LL99EEXX1122BB

LL1111AAXX5599AA
LL1111AAXX5599BB
LL1111AAXX6600AA
LL1111AAXX6600BB

CONTINUED

Cartridge Heaters

* Limited quantities available, consult factory for delivery.

113

Cartridge Heaters

FIREROD Immersion

Overall Approx

Diameter length Watt Density Fittings Net Wt.

in. in. (mm) Volts Watts W/in

5

⁄8 12 3⁄4 [phone] 300 (46.5) Brass 0.89 (0.41) Stock

12 3⁄4 [phone] 300 (46.5) SS 0.89 (0.41) Stock
12 3⁄4 [phone] 300 (46.5) Brass 0.89 (0.41) Stock
12 3⁄4 [phone] 300 (46.5) SS 0.89 (0.41) Stock

14 1⁄2 [phone] 300 (46.5) Brass 0.95 (0.43) Stock
14 1⁄2 [phone] 300 (46.5) SS 0.95 (0.43) Stock
14 1⁄2 [phone] 300 (46.5) Brass 0.95 (0.43) Stock
14 1⁄2 [phone] 300 (46.5) SS 0.95 (0.43) Stock

18 [phone] 295 (45.7) Brass 1.14 (0.52) Stock
18 [phone] 295 (45.7) SS 1.14 (0.52) Stock
18 [phone] 295 (45.7) Brass 1.14 (0.52) Stock
18 [phone] 295 (45.7) SS 1.14 (0.52) Stock

21 1⁄4 (540) 240 10000 300 (46.5) Brass 1.3 (0.59) Stock
21 1⁄4 (540) 240 10000 300 (46.5) SS 1.3 (0.59) Stock
21 1⁄4 (540) 480 10000 300 (46.5) Brass 1.3 (0.59) Stock
21 1⁄4 (540) 480 10000 300 (46.5) SS 1.3 (0.59) Stock

24 3⁄4 (629) 480 12000 300 (46.5) Brass 1.5 (0.68) Stock
24 3⁄4 (629) 480 12000 300 (46.5) SS 1.5 (0.68) Stock
29 3⁄4 (756) 480 15000 300 (46.5) Brass 1.8 (0.82) Stock
29 3⁄4 (756) 480 15000 300 (46.5) SS 1.8 (0.82) Stock

35 (889) 480 18000 300 (46.5) Brass 2.0 (0.91) Stock
35 (889) 480 18000 300 (46.5) SS 2.0 (0.91) Stock

* Limited quantities available, consult factory for delivery.

2

(W/cm2) Type lbs (kg) Availability Code No.

F.O.B.: St. Louis, Missouri

LL1122NNXX44AA
LL1122NNXX44BB
LL1122NNXX55AA
LL1122NNXX55BB

LL1144JJXX88AA
LL1144JJXX88BB
LL1144JJXX99AA
LL1144JJXX99BB

LL1188AAXX4433AA
LL1188AAXX4433BB
LL1188AAXX4444AA
LL1188AAXX4444BB

LL2211EEXX11AA
LL2211EEXX11BB
LL2211EEXX22AA
LL2211EEXX22BB

LL2244NNXX11AA
LL2244NNXX11BB**
LL2299NNXX55AA
LL2299NNXX55BB**

LL3355AAXX55AA
LL3355AAXX55BB

114