Watlow Heater Catalog

Specialty Heaters

Coil/Cable Heaters Formation Options

Coil Heaters The coil heater can be tight wound or open pitch.

Lead Orientation Options for Coiled Cable Heaters

Closed Coil without Distributed Wattage

Width

Width

Width

°

90

°

90

I.D.

I.D.

I.D.

Closed Coil with Distributed Wattage

1 / 8 ± 1 / 8 in. (3 ± 3 mm) 1 ± 1 / 8 in. (25 ± 3 mm)

1 / 8 in. 3 mm)

1 ± 1 / 8 in. (25 ± 3 mm)

Tail Section

Tail Section

Tail Section

Nom. 3 / 8 in. (9.5 mm) O.D.

Flat Spiral

Option 2C

Option 2C

Option 2A

Option 2A

Width Width

Width

I.D.

45° Flat, spiral formations are used to heat flat circular surfaces. This formation is often used in semiconductor and medical applications.

I.D.

I.D.

45°

Tail Section

Tail Section

90 °

90 °

3 / 8 ± 1 / 8 in. (10 ± 3 mm)

3 / 8 ± 1 / 8 in. (10 ± 3 mm)

1 / 4 in. (6 mm) R

in. (6 mm) R

Tail Section

1 ± 1 / 8 in. (25 ± 3 mm)

Width Tail Section

1 ± 1 / 8 in. (25 ± 3 mm)

Width

Option 2B

°

90

Option 2B

Option 2B

I.D.

I.D.

Width

1 / 8 ± 1 / 8 in. (3 ± 3 mm)

Flat Spiral with 2F Type Lead Orientation

°

90

Flat Spiral with 2A Type Lead Orientation

Flat Spiral with 2C Type Lead Orientation

1 ± 1 / 8 in. (25 ± 3 mm)

Tail Section

I.D.

Tail Section

Nom. 3 / 8 in. (9.5 mm) O.D.

Option 2C

Flat Spiral Inside Diameter Standards Cable Diameter—in. 1 / 16 (0.062) 3 / 32 (0.094) 1 / 8 (0.125) 5 / 32 (0.156)

1 ± 1 / 8 in. (25 ± 3 mm)

ption 2A

Tail Section

3 / 16 (0.188)

Option 2C Option 2C

5 / 8 (0.625)

3 3 3

Width

Width

3 / 4

(0.75)

3 3 3 3

7 / 8 (0.875)

3 3

I.D.

I.D.

45°

1

(1.0)

3 3 3

Tail Section

Width

90 °

1 3 / 16 (1.187)

3 3

1 1 / 4

(1.25)

3 / 8 ± 1 / 8 in. (10 ± 3 mm)

1 / 4 in. (6 mm) R

I.D.

1 ± 1 / 8 in. (25 ± 3 mm) 1 1 / 2

Tail Section

(1.5) (2.0) (2.5) (3.0)

3 3 3

45°

Tail Section

2 2 1 / 2 3

3 3

Option 2B

3 / 8 ± 1 / 8 in. (10 ± 3 mm)

Spiral Inside Diameter—in. Note: Maximum outside diameter is 6 inches.

mm) R

Option 2F

3 3 3

Tail Section

1 ± 1 / 8 in. (25 ± 3 mm)

Option 2B Note: Coiling or complex forming of stock heaters will generally result in increased resistance and reduction in wattage below 10 percent tolerance. Please contact factory before specifying power and resistance tolerance for formed cables.

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