Watlow Metric EB Cartridge Data sheet

6 mm (

in.)

No-Heat

Heated Length

6 mm (

in.)

No-Heat

WW AA TT LL OO W

Cartridge Heaters

Metric EB Cartridge

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

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 resistance wire, 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 silicone rubber seal protects the leads against moisture and other contaminants.

(190 W/in2)

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• VDE component recognition to 230VÅ(ac) according to VDE 0721 part 1/3.78 and part 2/3.78 Section E in connection with VDE 0720 part 1/11.74.

Next day shipment on all stock units.

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Applications

• Plastic injection molds, dies and sealing jaws

Hot melt systems, labeling

•

Industrial and textile

• manufacturing equipment

Cartridge Heaters

127

Cartridge Heaters

Watt Density—W/cm

Fit in Hole—mm

1 2 3 4 5 10 15 20 30 40 50

2.5

2.0

1.0

0.25

0.1

0.05

0.01

100°C

300°C

400°C

500°C

600°C

200°C

10 20 40 60 80 100 200 300

0.10

0.050

0.020

0.010

0.005

0.002

0.001

Watt Density—W/in

Fit in Hole—inches

1100°F

900°F

700°F

500°F

200°F

Metric EB Cartridge

Applications and Technical Data

Continued

Maximum Allowable Watt Density

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.

⁄2 inch) from the heater in a

(-0.0008 inch, -0.0031 inch)

3 percent with

(±

⁄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.

2.4 mm

Maximum Allowable Watt Density

128

WW AA TT LL OO W

6 mm

(

)

Specified

Cartridge Heaters

Metric EB Cartridge

Applications and Technical Data

Continued

Dimensional & Electrical Data

Heater Diameter (mm) 6.5 8 10 12.5 16 20

Nominal Diameter (in) 0.256 0.315 0.394 0.492 0.630 0.787

Maximum Voltage 250 250 250 400 480 480

Crimped-on Leads

Maximum Amps 4.4 4.4 6.7 9.7 23 23 Maximum Wattage @ 230V 1010 1010 1540 2230 5290 5290 Maximum Wattage @ 400V

Swaged-in Leads

Maximum Amps 3.1/4.4 Maximum Wattage @ 230V 710/1010 710/1010 1010 1750/2875 1750/2875 2875 Maximum Wattage @ 400V

➀

— — — 3040/5000 3040/5000 5000

3.1/4.4

➀

4.4 7.6/12.5 ➁7.6/12.5 12.5

3880 9200 9200

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.

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