The Watlow EB cartridge heater is a
proven performer like the metric
FIREROD®. That’s because the
same quality materials go into its
construction; MgO insulation, nickelchromium resistance wire,
silicone-fiberglass insulated lead
wires. The only difference is that the
EB cartridge is packaged in a more
economical design. Instead of
having the high watt density
capabilities of a metric FIREROD,
it’s made for medium watt density
applications.
Performance Capabilities
• Part temperatures to 600°C
(1100°F)
• Maximum watt density to
2
30 W/cm
• Maximum voltage to 480VÅ(ac)
Features and Benefits
• Magnesium oxide insulation,
compacted to the proper density,
results in high dielectric strength
and contributes to faster heat-up.
• Nickel-chromium resistancewire, precisely woundthrough the
heated length, assures even,
efficient distribution of heat to the
sheath.
• Metallurgically-bonded conductor pins, crimpconnected to the resistance wires,
ensure trouble-free electrical
continuity. This process provides
lead flexibility just 8 mm (5⁄16 inch)
from the end of the heater.
• Flexible stranded wires, with
silicone-fiberglass sleeve, insulate
the wires to temperatures of
250°C (480°F).
• Optional lead end with siliconerubber seal protects the leads
against moisture and other
contaminants.
Both the Maximum Allowable Watt
Density metric and inch-base charts
will tell you either the hole fit or
recommended watt density in
relationship to part temperature.
Enter the chart with either known
variable, part fit in hole dimension or
watt density. Then find the part
temperature by reading up or over
on the chart. The part temperature
curves shown are measured
13 mm (
mild steel block. For stainless steel
blocks, enter the graph with a fit of
0.04 mm (0.0015 inch) larger than
actual. For aluminum and brass
blocks, enter the graph with a
temperature 55°C (100°F) above
actual block temperature.
On-Off Cycling: On-off cycling
shortens heater life. If the heater
cycles more than once per hour,
multiply the watt density, shown on
the chart, by 0.8 to determine the
maximum allowable watt density for
the application. If the heater cycles
more than once a minute, multiply
by 0.7.
Tolerances
Diameter: -0.02 mm, -0.08 mm
Length: ±
Resistance: +5 percent, -10
Wattage: +10 percent, -5 percent.
1
⁄2 inch) from the heater in a
(-0.0008 inch, -0.0031 inch)
3 percent with
3
(±
⁄32 inch) minimum
percent. Resistance is measured
at room temperature following first
heater operation.
Wattage decreases approximately
5 percent with temperature.
Wattage tolerances are for
heaters at operating temperature.
Maximum Amps 4.44.4 6.7 9.723 23
Maximum Wattage @ 230V 101010101540 223052905290
Maximum Wattage @ 400V
Swaged-in Leads
Maximum Amps 3.1/4.4
Maximum Wattage @ 230V 710/1010710/101010101750/28751750/28752875
Maximum Wattage @ 400V
➀
———3040/50003040/5000 5000
3.1/4.4
➀
4.4 7.6/12.5 ➁7.6/12.5 12.5
388092009200
➀ On certain lead construction, maximum amperage is 3.1. Please consult Watlow.
➁ On certain lead construction, maximum amperage is 7.6. Please consult Watlow.
Termination Options
Crimped-on Lead
Crimped-on leads with a 6 mm
(1⁄4 inch) unheated section are
recommended for applications
where the lead wire temperature
does not exceed 250°C (480°F).
No-Heat Zone
An unheated section can be used to
extend the leads safely into a cool
zone in a high temperature
Galvanized Conduit
Flexible galvanized conduit can be
installed over the leads for abrasion
protection. It is attached with either a
Straight
Right Angle
straight or 90 degree elbow copper
coupler. The copper coupler
Unless a longer length is specified,
250 mm (10 inch) leads will be
supplied. To order, request
crimped-on leads and desired lead
length.
application. Leads should be kept
below 250°C (480°F) for maximum
service life. To order, specify no-heat zone and length of unheated
section.
overlaps the heater sheath by
6 mm (1⁄4 inch). A no-heat section
is required. To order, specify
galvanized conduit, straight or
right angle.
Cartridge Heaters
Stainless Steel Hose
Stainless steel hose also protects
leads against abrasion. It is attached
with a straight or 90 degree elbow
copper coupler. The copper coupler
overlaps the heater sheath by
6 mm (1⁄4 inch).
It can also be swaged-in straight or
silver soldered to the heater sheath
at a right angle. A no-heat section is
required. To order, specify stainless
steel hose, straight or right angle
with copper coupler, straight
swaged-in or right angle silver
soldered.
129
Page 4
25 mm
(1")
Min
6 mm
(
1
/
4
"
)
No-Heat
B
A
Cartridge Heaters
No-Heat
Section
Minimum
No-Heat
Minimum
No-Heat
Metric EB Cartridge
Termination Options
Continued
Galvanized Conduit and
Stainless Steel Hose Dimensions
Dimensions are shown for designs with copper coupler only.
7
⁄16)22(
1
⁄2)22(
5
⁄8)28(1 1⁄8)30(1 3⁄16)14(
3
⁄4)28(1 1⁄8)34(1 3⁄8)14(
7
⁄8)29(1 1⁄8)36(1 7⁄16)16(
7
⁄8)29(1 1⁄8)10(
7
⁄8)29(1 1⁄8)10(
7
⁄8)29(1 1⁄8)10(
3
⁄8)5.6(3⁄16)
3
⁄8)6.5(1⁄4)
3
⁄8)7.2(5⁄16)
9
⁄16)9.5(3⁄8)
9
⁄16)12.7(1⁄2)
5
⁄8)15.9(5⁄8)
Brass Stainless Steel
Stainless Steel Braid
Like stainless steel hose, stainless
steel braid also protects against
abrasion. Stainless steel braid is
swaged-in straight or crimped-on to
the heater at a right angle. Metal
Swaged-in Flexible Lead
Swaged-in flexible leads, with a
silicone-fiberglass insulation, are
recommended for applications in
which the leads must be bent at the
exit point from the heater. Unless
longer length is specified, 250 mm
(10 inch) leads are supplied.
Moisture Resistant Seal
Silicone rubber moisture resistant
seals can be provided at the lead
end to virtually seal the heater. This
seal is rated to 230°C (450°F)
continuous operation.
A 25 mm (one inch) no-heat section
is required at the lead end. Solid pin
leads exit through the seal with
Threaded Fitting
Either brass or stainless steel threaded fittings for screw-in mounting can
be added to units that have moisture
resistant seals. Available dimensions
are shown on the Threaded Fittings
braid is recommended when
excellent flexibility with good
physical protection is needed.
A unheated section is required. To
order, specify stainless steel braid,straight or right angle.
Heaters 140 mm (5 1⁄2 inches) or
shorter generally have a six mm
1
⁄4 inch) no-heat section. Heaters to
(
250 mm (10 inches) require a 25 mm
(one inch) no-heat section. Heaters
greater than 250 mm may require
more than a 25 mm no-heat section.
To order, please specify swaged-in
flexible leads.
crimped-on silicone rubber insulated
lead wires and silicone rubber
sleeves that extend into the seal.
Swaged-in leads are also an option
where flexibility at the lead exit is
required. To order specify, siliconerubber moisture resistant seal and
either crimped-on or swaged-in
leads
.
charts. To order, please request
brass or stainless steel threaded
fittings and location on the heater.
Note: For liquid immersion
applications, please also specify
heavy weld end disc.
ASTM Conductor CharacteristicsTemperature Range
Code
JCopperConstantan (Silver Color) -60 to 370(-75 to 700)
KChromel
For other ASTM types, contact Watlow.
Positive Negative
®
(Non-Magnetic)Alumel®(Magnetic) -20 to 1260(0 to 2300)
How to Order
To order stock AB cartridge heaters,
please specify:
• Code number
• Termination options, and length
of leads
Alumel®and Chromel®are registered
trademarks of Hoskins Manufacturing Co.
Internal Thermocouple
Style A is used to evaluate heat
transfer efficiency of an application.
The junction is located in the heater
core to monitor the internal
temperature of the heater.
Style B approximates part
temperature, and is available in all
diameters. The thermocouple
junction can be in contact with the
inside of the heater sheath, located
in the 13 mm (1⁄2 inch) no-heat
For made-to-order units, please
specify:
Diameter
•
Overall length
•
• Watts
Termination options, and length of
•
leads
section anywhere along the heater
length.
Style C is useful in applications
where material flows past the end of
the heater. This junction is embedded
in a special end disc. Type C is
available only on 6.5, 8,10, 12.5 and
16 mm diameter units.
To order, specify internal
thermocouple, Style A, B or C and
thermocouple ASTM Type J, T, K or
E. If not specified, 250 mm (10 inch)