Beckwith Electronics


Hamburg, Illinois 62045
(618) 232-1139

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EAO Switch



Lamps & Legends

Light Sources

The following information presents a description of the various light sources available for EAO products and a guide to their selection.

All EAO light sources in a socket can be relamped from the front panel for quick and easy replacement.

All EAO light sources are stationary within the switch assembly. By avoiding lamp travel, operating life is materially increased.

All EAO light sources are designed for even distribution, with no halo or hot spots.

Incandescent lamps, neon lamps, and LEDs (light emitting diodes) are available for most EAO switch products (see chart "Light Sources Available" for selection.) These three types of light sources have distinctly different characteristics. Each must be matched with appropriate lenses and other accessories for best results.

EAO lighted devices offer the designer a wide range of appearance options. Colors can be vivid or subdued. Lenses and legends can change color when illuminated. Legends can be hidden, appearing only when lighted, or be split, with one part always visible, another part appearing only when lighted. Components and application techniques must be selected for the effect desired.

The following information is intended to help the designer choose the combination of light source, lens, lens holder or diffuser, film insert, color filter, etc. to best meet the needs of a particular application.

Incandescent Lamps

The miniature and subminiature incandescent lamp is the most widely used light source for illumination panel devices because of its great versatility. Its omnidirectional and broad-spectrum characteristics make its emissions readily diffusible for even illumination of relatively large areas. The broad spectrum permits filtering for attractive color effects. High intensity provides good brightness even after attenuation by diffusing and/or filtering materials. Good broad area brightness permits free use of legends (by engraving, film inserts, or both) with assured contrast for legibility. Finally, incandescent lamps are available for direct connection to most common system voltages and are inherently self-regulating when so used.

The less desirable characteristics of incandescent lamps are that they operate at relatively high current levels and generate considerable heat. Lamp filaments, unlike solid state semiconductor devices, must operate in a self-destructive mode to produce light. Service life, although often long, is limited.

The average life ratings published by lamp manufacturers (and included in the tables that follow) are based on tests performed under laboratory conditions: stable ambient temperature, no shock or vibration, filaments operated on AC voltage-regulated to 1%. Average life is the elapsed time after which 50% of the lamps under test have failed. Failure includes a current increase to 10% above the initial current value and/or a brightness decrease to 20% less than initial brightness.

Average lamp life may be shortened by as much as 50% when lamps are operated on DC, which accelerates grain growth of the tungsten filament, leading to earlier development of hot spots. High ambient temperature (above 200F) shortens lamp life by increasing the rate of tungsten migration away from the filament wire. Lamps become increasingly vulnerable to failure from shock and vibration as they age and filaments are embrittled by grain growth. Failure most often occurs while no current is flowing, when the filament is most brittle.

When shock and vibration will be present it is best to use a low-voltage lamp. Higher-voltage filaments are generally longer and smaller in diameter, with a great number of resonant points. Derating lamps (operating them at less than rated voltage) improves life by lowering filament temperature. Maintaining current through the filament keeps the filament more resilient than if current is switched off entirely, and minimizes cold tungsten filament shock. (Less than 1% of rated voltage is required.) Operation of lamps in constant current or series circuit applications may reduce lamp life by subjecting filaments to excessive voltage.

Operating the pushbutton of an EAO device does not subject the lamp to shock or vibration forces. The lamp is fixed, its socket being integral with the body of the device. Moving parts of the pushbutton are all isolated from the lamp.

Lamps carried in stock by EAO meet most common application needs. Quantity permitting, many other lamps can be obtained to meet special requirements. Consult Beckwith Electronics.

When a lamp is to operate at other than rated voltage, the following formulas may be used to predict the effects on luminous intensity, life, and current. The results are reliable for applied voltages close to the rated voltage. The further the deviation from rated voltage, the greater the percentage of error in the approximation.

Formulas to rerate lamps:

Neon Lamps

Neon lamps are low-current, long-life light sources limited by the high ionization voltage of neon (>80 V) for use in line voltage circuits. Because the ionized gas holds a constant potential between lamp electrodes, a series resistor is required for current limiting. Larger lamps often include an integral resistor sized for a specific voltage.

Neon lamps glow with a low-intensity amber light, or green if the lamp is phosphor-coated. Bright light and vivid colors are not obtainable with neon lamps, but their typical low current drain, better than 25,000 hour service life, and good resistance to shock and vibration make them useful alternatives in many line voltage applications. For best visibility, they should be used with clear lenses and diffusers.

Light Emitting Diodes

Solid-state LEDs operate at relatively low current levels and have virtually unlimited service life. Characteristics do not change significantly with age, and they are not easily damaged by shock or vibration. The light emitted, however, is of relatively low intensity. To offset this, instead of using the single chip concept in certain LED base configurations, we use a four, six, or eight chip configuration with a wide viewing angle and increased light intensity. Although not as intense as an incandescent lamp, multi-chip performance is very good, and should be adequate for many applications.

Another feature of multi-chip based LEDs is the inclusion of a built-in resistor to accommodate higher voltages without an external resistor. EAO stocks the common voltages of 6, 12, 24, and 48 volts, and are offered in red, green, and yellow.

The single chip LED is only used in our T-1 configuration. Due to small size, multi-chip design currently is not practical in T-1 size. However, since the T-1 normally is used in a confined space with a small lens, the high efficiency single-chip LEDs we use produce excellent results.

Current limiting and reverse polarity protection for LEDs can be provided by external LED control circuits.

Selection of a proper lens can increase brightness. For example, the use of a transparent lens cap and transparent diffuser increases light output, and is usually needed for the larger lenses.

Lamp Tables

The following tables help users select illumination for each EAO switch series. They present data characterizing incandescent lamps, neons, and LEDs.

The tables indicate each switch series covered and include the following information:

Illumination type and style of bulb

Outline drawing of bulb

General data including color and number of LED chips

Electrical ratings: volts and milliamps

Luminous intensity in mean spherical candle power (mscp), millicandela (mcd), millilumens (mim)

Average expected life in hours

EAO part number

Series 01, 14 Illumination
Illumination
Type
General
Data
Electrical Ratings Luminous
Intensity
Average
Life (hours)
Former
P/N
Part Number
Volts Milliamps
Incandescent*
T-5.5, Slide Base


Clear 6 200 0.48 mscp 6,000 01-903.0 10-1106.1369
Clear 12 100 0.32 mscp 5,000 01-903.1 10-1109.1329
Clear 24 50 0.27 mscp 6,000 01-903.2 10-1112.1279
Clear 30 40 0.29 mscp 6,000 01-903.3 10-1114.1249
Clear 36 35 0.25 mscp 5,000 01-903.4 10-1116.1229
Clear 48 25 0.21 mscp 5,000 01-903.5 10-1119.1199
Clear 60 20 0.17 mscp 6,000 01-903.6 10-1120.1179
Neon
T-5.5, with integral resistor

Amber 115 1.7 100 mim >25,000 01-960.8 10-7123.2022
Amber 230 1.8 100 mim >25,000 01-960.9 10-7125.2032
Green 115 1.6 100 mim >25,000 01-961.8 10-7123.2025
Green 230 1.7 100 mim >25,000 01-961.9 10-7125.2025
Multi-chip LED
T-5.5, with integral resistor


6-chip 6 DC 45 45/50/115 mcd** >50,000 01-968.0 10-5106.325
6-chip 12 DC 30 45/50/115 mcd** >50,000 01-968.1 10-5109.320
6-chip 24 DC 15 45/50/115 mcd** >50,000 01-968.2 10-5112.314
6-chip 28 DC 15 36/63/90 mcd** >50,000   10-5113.314
6-chip 48 DC 14 42/46/107 mcd** >50,000 01-968.4 10-5119.313
Series 02, 03 Illumination
Incandescent*
T-6.8, Slide Base


Clear 6 200 0.48 mscp 5,000 02-903.0 10-1206.1369
Clear 12 100 0.44 mscp 5,000 02-903.1 10-1209.1329
Clear 24 50 0.28 mscp 6,000 02-903.2 10-1212.1279
Clear 30 40 0.36 mscp 6,000 02-903.3 10-1214.1249
Clear 36 35 0.25 mscp 5,000 02-903.4 10-1216.1229
Clear 48 25 0.21 mscp 5,000 02-903.5 10-1219.1199
Clear 60 20 0.18 mscp 6,000 02-903.6 10-1220.1179
Neon
T-6.8, with integral resistor

Amber 115 1.7 60 mim >25,000 02-960.8 10-7223.2022
Amber 230 1.8 60 mim >25,000 02-960.9 10-7225.2032
Green 115 1.6 60 mim >25,000 02-961.8 10-7223.2025
Green 230 1.7 60 mim >25,000 02-961.9 10-7225.2025
Multi-chip LED
T-6.8, with integral resistor


6-chip 6 DC 45 45/50/115 mcd** >50,000 02-968.0 10-5216.325
6-chip 12 DC 30 45/50/115 mcd** >50,000 02-968.1 10-5209.320
6-chip 24 DC 15 45/50/115 mcd** >50,000 02-968.2 10-5212.314
6-chip 28 DC 15 36/63/90 mcd** >50,000   10-5213.314
6-chip 48 DC 14 42/46/107 mcd** >50,000 02-968.4 Discontinued
for reference only

10-5219.312

Series 04 Illumination
Incandescent
T-3 1/4, bayonet base
For higher voltages use lamp transformer or resistor/capacitor block



Clear 6 200 0.30 mscp 15,000 700-000.0 10-1406.1369
Clear 12 100 0.25 mscp 10,000 700-000.1 10-1409.1329
Clear 24 50 0.32 mscp 5,000 700-000.2 10-1412.1279
Clear 36 56 0.50 mscp 5,000 700-000.3 10-1416.1289
Clear 48 42 0.50 mscp 5,000 700-000.4 10-1419.1249
Clear 60 33 0.40 mscp 3,000 700-000.5 10-1426.1219
Clear 110 22 0.30 mscp 4,000 700-000.6 10-1422.1179
Clear 130 20 0.10 mscp 7,000 700-000.7 10-1424.1179
Neon
T-3 1/4, with integral resistor

Amber 115 0.7 100 mim >25,000 700-001.0 10-7423.2012
Amber 230 1.5 100 mim >25,000 700-001.1 10-7425.2022
Amber 400 0.8 100 mim >25,000 700-001.2 10-7426.2012
Multi-chip LED
T-3 1/4, with integral resistor


8-chip 6 DC 80 50/30/30 mcd** >50,000 700-002.0 10-6406.331
8-chip 12 DC 40 50/30/30 mcd** >50,000 700-002.1 10-6409.324
8-chip 24 DC 19 50/30/30 mcd** >50,000 700-002.2 10-6412.316
8-chip 48 DC 16 50/30/30 mcd** >50,000 704-002.4 10-6419.315
Series 11, 19, 99 Illumination
Incandescent*
T-1, Bi-Pin

Series 11, 99


Clear 6 115 0.15 mscp 3,000 11-903.0 10-1606.1339
Clear 12 60 0.15 mscp 10,000 11-903.1 10-1609.1289
Clear 18 26 0.15 mscp 10,000 11-903.2 10-1611.1199
Clear 24 24 0.15 mscp 25,000 11-903.3 10-1612.1189
Clear 28 24 0.15 mscp 25,000 11-903.4 10-1613.1189
Incandescent*
T-1, Bi-Pin

Series 19

Clear 6 70 0.90 mscp 40,000 19-903.00 Discontinued
for reference only

10-1606.1309

Clear 12 25 0.25 mscp 2,000 19-903.10 10-1609.1199
Clear 24 20 0.20 mscp 5,000 19-903.30 Discontinued
for reference only
Use 10-1612-1189

10-1612.1179

LED
T-1, Bi-Pin

Red 1.7 DC 20 30 mcd 50,000 99-943.02 10-2602.3172C
Yellow 2.1 DC 20 30 mcd 50,000 99-943.04 10-2602.3174C
Green 2.1 DC 20 20 mcd 50,000 99-943.05 10-2602.3175C
Multi-chip LED,
T-1, Bi-Pin

Red, 4-chip 28 DC 12 14 mcd 50,000 11-968.32 10-4613.3102B
Orange, 4-chip 28 DC 12 26 mcd 50,000 11-968.33 10-4613.3103B
Yellow, 4-chip 28 DC 12 22 mcd 50,000 11-968.34 10-4613.3104B
Green, 4-chip 28 DC 12 30 mcd 50,000 11-968.35 10-4613.3105B
Series 22, 30, 31, 51, 52, 61, 71 Illumination
Incandescent*
T-1 3/4, Midget Grove Base


Clear 6.3 200 0.40 mscp 20,000 31-963.0 10-1307.1369
Clear 14 80 0.30 mscp 15,000 31-963.1 10-1310.1319
Clear 28 40 0.30 mscp 10,000 31-963.2 10-1313.1249
Clear 36 30 0.28 mscp 5,000 31-963.5 10-1316.1209
Clear 48 25 0.20 mscp 5,000 31-963.3 10-1319.1199
Clear 60 20 0.15 mscp 5,000 31-963.4 10-1320.1179
Multi-chip LED
T-1 3/4 with integral resistor


6-chip 6 DC 45 45/50/115 mcd** >50,000 31-968.0 10-5306.325
6-chip 12 DC 30 45/50/115 mcd** >50,000 31-968.1 10-5309.320
6-chip 24 DC 14 45/50/115 mcd** >50,000 31-968.2 10-5312.313
6-chip 48 DC 12 36/40/92 mcd** >50,000 31-968.4 10-5319.312
Series 41 Illumination
Incandescent*
T-1 3/4, Midget Grove Base


Clear 6 125 0.35 mscp 10,000 41-963.0 10-1306.1349
Clear 12 75 0.20 mscp 10,000 41-963.1 10-1309.1309
Clear 18 40 0.20 mscp 5,000 41-963.2 10-1311.1249
Clear 24 35 0.20 mscp 5,000 41-963.3 10-1312.1229
Clear 28 30 0.30 mscp 5,000 41-963.4 10-1313.1209
Clear 48 20 0.20 mscp 5,000 41-963.5 10-1319.1179
Multi-chip LED
T-1 3/4 with integral resistor


6-chip 6 DC 45 45/50/115 mcd** >50,000 31-968.0 10-5306.325
6-chip 12 DC 30 45/50/115 mcd** >50,000 31-968.1 10-5309.320
6-chip 24 DC 15 45/50/115 mcd** >50,000 31-968.2 10-5312.313
6-chip 48 DC 12 36/40/92 mcd** >50,000 31-968.4 10-5319.312
Series 70, 84, 92 Illumination
LED,
T-1 Bi-Pin


Red 2.0 DC 20 8 50,000 92-948.2 10-2602.3172D
Orange 2.2 DC 20 12 50,000 92-948.3 10-2602.3173D
Yellow 2.1 DC 20 20 50,000 92-948.4 10-2602.3174D
Green 2.1 DC 20 12 50,000 92-948.5 10-2602.3175D
LED,
T-1, Multi-Chip


Red 12.0 DC 20 45 50,000 92-945.2 10-5609.3172D
Orange 12.6 DC 20 50 50,000 92-945.3 10-5609.3173D
Yellow 12.9 DC 20 135 50,000 92-945.4 10-5609.3174D
Green 12.9 DC 20 30 50,000 92-945.5 10-5609.3175D
LED,
T-1, Multi-Chip

Red 6 40 45 >50,000 92-944.2 10-5606.3242D
Orange 6.3 40 50 >50,000 92-944.3 10-5606.3423D
Yellow Green 6.5 40 135 >50,000 92-944.4 10-5606.3244D
LED,
T-1, Multi-Chip, Bi-Color
Red/Green
4.2-8.5 DC use external resistors 20 20/30 50,000 92-945.2/5 10-5604.317AD
Series 96 Illumination
LED, T-1, Bi-Pin


Standard - leads not cut
Red 2.1 DC 20 3.5 50,000 98-843.021 EUS98-843.021
Yellow 2.1 DC 20 3.5 50,000 98-843.041 EUS98-843.041
Green 2.1 DC 20 2.5 50,000 98-843.051 EUS98-843.051


Leads cut to proper length with special form to lock in position
Red 2.1 DC 20 3.5 50,000 98-843.022 10-2602.3172E
Yellow 2.1 DC 20 3.5 50,000 98-843.042 10-2602.3174E
Green 2.1 DC 20 2.5 50,000 98-843.052 10-2602.3175E


Leads formed for A & D holes
Red 2.1 DC 20 3.5 50,000 98-843.023 10-2602.3172H
Yellow 2.1 DC 20 3.5 50,000 98-843.043 10-2602.3174H
Green 2.1 DC 20 2.5 50,000 98-843.053 10-2602.3175H
Discontinued
for reference only



Leads cut for Euro-style key caps

Red 2.1 DC 20 3.5 50,000 96-848.21 10-2602.3172K
Yellow 2.1 DC 20 3.5 50,000 96-848.41 10-2602.3174K
Green 2.1 DC 20 2.5 50,000 96-848.51 10-2602.3175K
Series 97 Illumination
LED, T-1, Bi-Pin
High intensity , wide angle

Red 2.0 DC 20 8 50,000 97-946.02 10-2602.3172G
Qrange 2.0 DC 20 12 50,000 97-946.03 10-2602.3173G
Yellow 2.1 DC 20 20 50,000 97-946.04 10-2602.3174G
Green 2.1 DC 20 12 50,000 97-946.05 10-2602.3175G


Series 18 Illumination
Illumination
Type
General
Data
Electrical Ratings Luminous
Intensity
(mcd)
Average
Life (hours)
Integral Lens and LED Part Number
Volts Milliamps Rectangular Square Round
LED
High intensity LED is part of the Weries 18 illuminated lens
Red 2.0 DC 20 8 >50,000 18-941.2 18-951.2 18-931.2
Yellow 2.1 DC 20 20 >50,000 18-941.4 18-951.4 18-931.4
Green 2.1 DC 20 12 >50,000 18-941.5 18-951.5 18-931.5

Legend & Illumination Techniques
General. The great variety of legend and illumination effects obtainable with EAO devices includes not only the choice of light source, but also lens and legend style selection. While details vary from series to series, the lens system generally consists of two parts: 1. the lens cap and 2. a diffuser or lens holder that usually are combined under one part number.

Illumination effects depend on the following component choices:

Legends are usually produced by engraving on the lens or diffuser surface, or films can be inserted between the lens cap and the diffuser.

Intensity changes when illuminated.
This most common effect is obtained by using any colored lens and is called transmitted color. More vivid color change effects can be created by using a Solar Black lens. When unlit, this lens appears to be opaque black and will conceal a colored film insert or film holder behind it. When the lamp lights, however, the lens becomes illuminated and visible.

Visible legend: background lights.
This effect can be obtained with any lens by having the legend engraved into the lens and filled with contrasting ink. Where heavy pushbutton use might wear off an engraving, the legend can instead be engraved and filled on the diffuser. As an alternative to engraving, a film positive insert can be used between a transparent lens and a translucent backing element.

Visible legend: background color changes when lighted.
For this effect, use a clear lens, a film positive insert, a translucent white backing element, and a color filter boot on the lamp. This is called projected color.

Dead front: legend appears only when illuminated. With a translucent lens, this can be done by engraving and filling the legend on the backing element, or by using a film insert (positive for lighted background, negative for lighted legend). It can also be obtained using a Solar Black lens with a film insert and white or colored backing element.

Other effects.
Combined visible/hidden legend effects can be achieved by engraving the visible portion on a translucent or Solar Black lens and the hidden portion on the backing element. For phototypes and low-volume projects, transfer lettering and transparent color films available at art supply shops may be useful additions to the lenses, accessories, and services offered by EAO.





Film Legends

Film Legends
A film, either black and white or color, may be inserted between the lens cap and diffuser. To prepare the lens for film, simply press the diffuser legs together and remove the lens cap. Film then may be placed on the diffuser and the cap snapped back into its original position. When using film, it is recommended that a transparent lens cap be used. In applications where the legend is to appear only when illuminated, use the dead front technique.

Typical film application

Color Filter Boots
Color filter boots are made from silicon rubber material and fit over the specific lamp. The effect of using a colored filter boot is to project the color of the boot onto the lens area. Used with a translucent white lens or a clear lens, this technique presents a change from a white indication when unlighted to a pleasing pastel colored glow when illuminated. A second advantage of using a color filter boot is an increase in lamp life by 5-6 percent because the boot acts as a heat sink.

Description Color T-1 3/4
Part No.
T-3 1/4
Part No.
Flexible color
filter boots for
indicator lamps
Red 31-102 704-102
Orange 31-103 704-103
Yellow 31-104 704-104
Green 31-105 704-105
Blue 31-106 704-106
White correcting blue 31-109 704-109

Film thickness: 0.2 mm (0.008) except Series 92: See below
Series Rectangular Square
01 10.2 x 16.2 mm
(0.401 x 0.637)
10.2 x 10.2 mm
(0.401 x 0.401)
02 22.4 x 13.4 mm
(0.881 x 0.527)
 
03 34.3 x 14.3 mm
(1.35 x 0.562)
15.6 x 14.3 mm
(0.614 x 0.562)
 
04   21.4 x 21.4 mm
(0.843 x 0.843)
22 22.4 x 13.4 mm
(0.881 x 0.527)
 
30 12.7 x 18.7 mm
(0.500 x 0.736)
 
31 12.7 x 18.7 mm
(0.500 x 0.736)
12.7 x 12.7 mm
(0.500 x 0.500)
41 12.7 x 18.7 mm
(0.500 x 0.736)
 
51 12.7 x 18.7 mm
(0.500 x 0.736)
12.7 x 12.7 mm
(0.500 x 0.500)
61


Overhanging
lens
12.7 x 18.7 mm
(0.500 x 0.736)

11.9 x 18 mm
(0.469 x 0.709)
12.7 x 12.7 mm     16.9 x 16.9 mm
(0.500 x 0.500)     (0.666 x 0.666)

11.9 x 11.9 mm
(0.469 x 0.469)
85 12.7 x 18.7 mm
(0.500 x 0.736)
 
96 7 x 12 mm
(0.276 x 0.472)
 
92  
For IP 67
10.4 x 10.4 mm
(0.410 x 0.410)
thickness : 0.2 mm   
For IP 40
11.4 x 11.4 mm
(0.449 x 0.449)
thickness : 0.2 mm
99 Single: 16 x 16 mm (0.629 x 0.629)
Double: 16 x 34.7mm (0.629 x 1.37)
Triple: 16 x 53.8 mm (0.629 x 2.12)

Series 92 Legends
Series 92 pushbuttons and indicators can be obtained with a legend or symbol. A drawing or artwork is required. IP 40 actuators are engraved on the lens surface. IP 67 actuators are engraved on the legend plate.

The standard stroke thickness is 0.5 mm (0.020").

Legends are filled with a special hard enamel paint. Red, blue, green, black, and gray colored lenses are filled with white paint. All other color lenses are filled with black paint.

Film legends may be used. The film should be as specified in the above chart. Consult Beckwith Electronics for details. When removing membrane caps to insert film, tool 92-998 must be used to assure proper installation.

Laser and pad printing are also available when large quantities are required. Cost savings are substantial, but these techniques require high costs for initial set-up.

Any special symbols will require a one-time charge for producing plates or appropriate computer programming.

Height of
letters (mm)
No. of lines Letters per line
(capitals)
3 2 5-6
4 2 4
5 1 3
6 1 2-3
8 1 2







Legend & Engraving information

Engraved legends

Legends are engraved on the front surface of the lens cap and ink filled. Red, blue, green, black, and gray colored lens caps are refilled with white ink. All other colons are filled with black Ink.

Engraving type is condensed gothic, with standard 0.125" by 0.020" stroke. Legend Arrangements

How to Order Engraved Legends
Clearly identify legends requirement, as a separate item, using the following instructions:



Legend Arrangements
Series Rectangular
Vertical
Round
Square
Split Rec. (R) Vert.(V) Sections
Lens
Part
No.
Max.
No.
of
Lines
Max.
No.
of
Letters
Lens
Part
No.
Max.
No.
of
Lines
Max.
No.
of
Letters
Lens
Part
No.
Max.
No.
of
Lines
Max.
No.
of
Letters
Lens
Part
No.
Max.
No.
of
Lines
Max.
No.
of
Letters
Lens
Part
No.
Max.
No.
of
Lines
Max.
No.
of
Letters
01 01-901 2 7 01-901 4 4 01-931 2 5 01-951 2 4      
02/22 02-901 3 10 02-901
02-902
4 7                  
03 03-901
03-941
4 16 03-901
03-941
8 6             03-902
03-943
3 6
04             704-608.9 3 9 704-708.9 4 9      
704-609.9 3 7 704-709.9 4 8
14             See Series 04            
18, 19 Pushbuttons and indicators can be engraved. Please contact Beckwith Electronics
30 See series 31                  
31 31-901 3 8 31-901 4 5 31-931 2 5 31-951 3 5      
41 See Series 31             41-903 4 3(R)
41-907 2 5(V)
51 51-901 3 8 51-901 4 5 51-931 2 5 51-951 3 5      
61 Std.

Overhang. lens
61-923.1 3 8 61-923.1 4 5 61-921.1 2 5 61-922.1 3 5 (Large Sq. 61-925.1, 3 lines, 7 letters)
61-928.1 3 9 61-928.1 4 6       61-927.1 3 6      
92                   See Note 1 2 6      
99 99-963 3 16             99-908 3 6      
99-968 3 25


Series 96
Height of
letters
(h)
No.
of
lines
Letters
per
line
No.
of
lines
Letters
per
line
No.
of
lines
Letters
per
line
2.5 (0.098) 2 5 2 6 2 7-8
3 (0.118) 2 4 2 5 2 6-7
4 (0.157) 1 3-4 1 4 1 4-5
5 (0.196) 1 2-3 1 3 1 3-4
6 (0.236) 1 2 1 2-3 1 2-3
8 (0.314) 1 1 1 1-2 1 2






Legend and ISO-Symbols for Series 04

Legends and ISO-Symbols are hot stamped on Series 04 and Series 14 diffusers or Series 04 square film. The following part numbers will indicate the component for requesting legends or ISO-Symbols.

Component for Legend or ISO-SymbolPart Number
Indicator -- round diffuser704-608.9
Indicator -- round knurled diffuser704-608.7
Pushbutton -- round diffuser 704-609.9
Pushbutton -- round knurled diffuser704-609.7
Pushbutton -- round extended diffuser704-610.9
Pushbutton -- round knurled extended diffuser    704-610.7
Indicator -- square diffuser704-708.9
Indicator -- square film704-706.7
Pushbutton -- square diffuser704-709.9
Pushbutton -- square film704-707.7

When ordering a legend or ISO-Symbol to be part of the above part numbers, please order as follows:
Example 1:     704-608.9 Legend 1
Example 2:704-706.7 ISO-8
Example 3:704-707.7 Legend 15
Example 4:704-609.9 ISO-27

We carry a large stock of the above components but to assure proper delivery, please allow 6-8 weeks for selected legends or ISO-Symbols to be hot stamped.