Watlow Electric Firerod Immersion - Manual (Page 2)

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
Availability
Stock: Same day shipment
Made-to-Order: Consult Watlow
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 to 300 W/in
2 is
recommended. (Laboratory test show that under certain
conditions ratings as high as 700 W/in
2 are 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 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.
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
® 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.
To be automatically connected to the nearest North American Technical and Sales Office call:
1-800-WATLOW2
International Technical and Sales Offices: Australia, +61 (39) 335-6449 • China, +86 (21) 5211-0231 • France, +33 (01) 3073-2425 •
Germany, +49 (0) 7253-9400-0 • Italy, +39 (02) 458-8841 • Japan, +81 (03) 3518-6630 • Korea, +82 (02) 575-9804 • Malaysia, +60 (4) 641-5977 •
Mexico, +52 (442) 217-6235 • Singapore, +65 6773-9488 • Spain, +34 91 675 12 92 • Sweden, +46 31 7014959 • Taiwan, +886 (0) 7-288-5168 •
United Kingdom, +44 (0) 115-964-0777