Richards Thermocouple and Temperature Sensor Catalog 16

Heater Ribbon - Type A (80% Nickel and 20% Chromium)

The Arklay S. Richards Co., Inc. offers two types of resistance heating ribbon. The Richards NRA or Type A heater ribbon is composed of 80% Nickel and 20% Chromium. It has a lower temperature coefficient of resistance when compared to Type C ribbon. The Type A has a usable temperature range up to 1150°C or 2100°F . Our NRC or Type C is composed of 60% Nickel, 16% Chromium, and 24% Iron. The Type C has a usable temperature range up to 1000°C or 1850°F . It has a higher coefficient of resistance than the Type A. Both types have excellent corrosion resistance. The Type C wire is very useful in applications where a high resistance is required within a limited space. In heating and technical appli- cations, the Type A is most commonly used. The values in the chart are Ohms / foot. Use the chart below to build a part number. For Type A take NRA plus Code 1 (thickness) and Code 2 (width) for the desired type, thickness and width. Example: Type A 0.0100 thick x 1/8” wide = NRA2108. For Type C change the “ A ” to a “ C ”.

Heater Ribbon - Type A (80% Nickel, 20% Chromium) Part Number = NRA + Code 1 & Code 2 .0156 in 1/64 in .397 mm .0312 in 1/32 in .794 mm .0625 in 1/16 in 1.59 mm .0937 in 3/32 in 2.38 mm .1250 in 1/8 in 3.18 mm

.1875 in

.2500 in

.3750 in

.5000 in

.6250 in

.7500 in

1.000 in

3/16 in

1/4 in

3/8 in

1/2 in

5/8 in

3/4 in

1 in

4.76 mm

6.35 mm

9.53 mm

12.7 mm

15.88 mm

19.05 mm

25.4 mm

THICKNESS

CODE 2 - WIDTHS

C

Inches

mm

01

02

03

06

08

12

16

24

32

40

48

64

0

0.102

2.59

.02128 .01333 .01000 .008000 .006667 .005000

0

0.091

2.31

.02385 .01495 .01121 .008967 .007473 .005604

0

0.081

2.06

.02679 .01679 .01259 .01007 .008395 .006296

0

0.072

1.83

.03014 .01889 .01417 .01133 .009444 .007083

0 0 0

0.064 0.057 0.051

1.63 1.45

.04521 .03391 .02125 .01594 .01275 .05077 .03807 .02386 .01790 .01432 .05674 .04255 .02667 .02000 .01600

.01063 .007969 .01193 .008947

1.295

.01333

.01000

0

0.045

1.143

.06430 .04823 .03022 .02267 .01813

.01517

.01133

0

0.040

1.016

.1085 .07234 .05426 .03400 .02550 .02040

.01700

.01275

1

0.036

0.914

.1206 .08038 .06028 .03778 .02833 .02267

.01889

.01417

1

0.032

0.813

.1356 .09043 .06782 .04250 .03188 .02550

.02125

.01594

1

0.0285

0.724

.1523

.1015 .07615 .04772 .03579 .02863

.02386

.01790

1

0.0253 0.6426

.1716

.1144 .08578 .05376 .04032 .03225

.02688

.02016

1

0.0226 0.5740

.1921

.1204 .09027 .06018 .04513 .03611

.03009

.02257

1

0.0201 0.5105

.4319

.2879

.2159

.1353 .11015 .06766 .05075 .04060

.03383

.02537

1

0.0179 0.4547

.4850

.3233

.2425

.1520

.1140

.07598 .05698 .04559

.03799

.02849

1

0.0159 0.4039

1.092

.5460

.3640

.2730

.1711

.1283

.08554 .06415 .05232

.04277

.03208

1

0.0142 0.3607

1.223

.6113

.4076

.3057

.1915

.1437

.09578 .07183 .05747

.04789

.03592

1

0.0126 0.3200

1.378

.6890

.4593

.3445

.2159

.1619

.1079

.08095 .06476

.05397

.04048

2

0.0113 0.2870

1.536

.7682

.5121

.3841

.2407

.1805

.1204

.09027 .07221

.06018

.04513

2

0.0100 0.2540

3.472

1.736

.8681

.5787

.4340

.2720

.2040

.1360

.1020

.08180

.06800

.05100

2

0.0089 0.2261

3.902

1.951

.9754

.6503

.4877

.3056

.2292

.1528

.1146

.09169

.07640

.05730

2

0.0080 0.2032

4.340

2.170

1.085

.7234

.6145

.3400

.2550

.1700

.1275

.1020

.08500

.06375

2

0.0071 0.1803

4.891

2.445

1.223

.8151

.6923

.3831

.2873

.1915

.1437

.1149

.09578

.07183

2

0.0063 0.1600

5.512

2.756

1.378

.9186

.7803

.4317

.3238

.2159

.1619

.1295

.1079

.08095

2

0.0056 0.1422

6.201

3.100

1.550

1.170

.8778

.4857

.3643

.2429

.1821

.1457

.1214

.09107

2

0.0050 0.1270

6.945

3.472

1.736

1.311

.9831

.5440

.4080

.2720

.2040

.1632

.1360

.1020

2

0.0045 0.1143

7.716

3.858

1.929

1.456

1.092

.6044

.4533

.3022

.2267

.1813

.1511

.1133

2

0.0040 0.1016

8.681

4.340

2.458

1.639

1.229

.6800

.5100

.3400

.2550

.2040

.1700

.1275

3

0.0035 0.0889

9.921

4.960

2.809

1.873

1.404

.7771

.5829

.3886

.2914

.2331

.1943

.1457

3

0.0031 0.0787

11.20

5.601

3.171

2.114

1.586

.8774

.6581

.4387

.3290

.2632

.2194

.1645

3 0.00275 0.0699

12.63

6.313

3.575

2.383

1.788

.9891

.7418

.4945

.3709

.2967

.2473

.1855

3 0.00250 0.0635

13.89

6.945

3.933

2.622

1.966

1.088

.8160

.5440

.4080

.3264

.2720

.2040

3 0.00225 0.0559

15.43

7.716

4.369

2.913

2.185

1.209

.9067

.6044

.4533

.3627

.3022

.2267

3 0.00200 0.0508

17.36

9.831

4.916

3.277

2.458

1.360

1.020

.6800

.5100

.4080

.3400

.2550

Page 166

Phone: 617.527.4385 Fax: 617.964.3746 Email: sales@asrichards.com