Watlow Electric Firerod Immersion User Manual

FIREROD

Compact Unit Gives
Versatility in
Designing a Heating
System

®

IMMERSION

FIREROD®immersion heaters package up to 300 W/in
(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
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.

3

⁄4 (19 mm) NPT double threaded screw plug,

2

Performance Capabilities

• Maximum operating temperature in water to 100OC (212OF)

at 14.7 psi

2

• Maximum watt density to 300 W/in

Maximum voltage to 480V

•

Å(ac)

(46.5 W/cm2)

Applications

• Plastic reclamation

• Food preparation

Lab equipment

•

Features and Benefits

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

• Ensures a trouble-free electrical continuity

Lead end with silicone rubber seal

• Protects the heater against moisture contamination

Optional stainless steel fittings

• Available for use in corrosive applications

Horizontal through the wall tank mounting

• Makes setup faster

240 and 480VÅ(ac)

• Provides wiring flexibility

Stock availability

• Same day shipment on various 5⁄8 in. diameter heaters with

3

⁄4 in. NPT

Nickel-Chromium
Resistance Wire

4 in. (100 mm)

No-Heat

Magnesium
Oxide Insulation

Double Threaded Brass

3

⁄4 in. NPT - 13⁄8 in. long*

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

*Standard on 5⁄8 and 3⁄4 in. diameter heaters.

Incoloy is a registered trademark of Special Metals Corporation.

© 2005 Watlow Electric Manufacturing Company

Incoloy
Sheath

®

STL-FRI-0505

12001 Lackland Road
St. Louis, Missouri 63146 USA
Phone: [phone]

: [phone]

FAX
Internet: www.watlow.com
e-mail: [e-mail]

The small size and big capacity of FIREROD cartridge heating
units make them ideal immersion heaters in cramped quarters.

hen heating liquids of low viscosity, FIRERODs have the high

W
watt density to pack more heat into tight spots. For water
heating applications a rating of 150 to 300 W/in
recommended. (Laboratory test show that under certain
conditions ratings as high as 700 W/in

t high watt densities:

a

• 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 liquids at
all times.

• The heater should not be allowed to cycle on and off too
frequently.

• Scale should not be allowed to form on the sheath.

2

are safe.) For longer life

2

is

Ordering Information

To order stock FIREROD immersion heaters, specify
Watlow code number (from Watlow Heater’s catalog)
and quantity.

For made-to-order units, please specify:

• Diameter

Overall length

•

• Immersed length

• Heated length

• Watts

• Volts

• Threaded fitting material and size

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 resistant 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
standard but other sheath materials can be provided. Headers
and sheath material should be suited to the material being
heated.

®

or 304 stainless steel sheaths are

Availability

Stock: Same day shipment

Made-to-Order: Consult Watlow

To be automatically connected to the nearest North American Technical and Sales Office call:

1-800-WATLOW2

International Technical and Sales Offices:

Germany, [phone] • Italy, [phone] • Japan, [phone] • Korea, [phone] • Malaysia, [phone] •
Mexico, [phone] • Singapore, [phone] • Spain, [phone] • Sweden, [phone] • Taiwan, [phone] •
United Kingdom, [phone]

Australia,

[phone] • China, [phone] • France, [phone] •