H-492-1 Bourns Inc., H-492-1 Datasheet

H-492-1

Manufacturer Part Number

H-492-1

Description

Knobs & Dials 1 inch 0-30 Turns CO

Manufacturer

Bourns Inc.

Series

Type

Dialr

Datasheet

1.H-491-3.pdf (1 pages)

Specifications of H-492-1

Design

Hex Set Screw

Shaft Size

3.18 mm

Diameter

25.4 mm

Color

Satin Chrome

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

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H-490 MOUNTING INSTRUCTIONS

1. Discard standard mounting nut and lockwasher supplied with

2. Insert potentiometer in panel.

3. Using parts supplied with dial, position anti-rotation washer

4. Install mounting nut supplied with dial. Be sure:

Number of Turns ............................................................................................................................................................................. 0 to 30

Dial Divisions ...........................................................................................................................................................................100 per turn

Readability - Over 10 Turns ................................................................................................................................................. 1 part in 1000

Torque With Brake Engaged ........................................................................................................................ 350 g-cm (5 oz-in.) minimum

Markings ........................................................................................................................................................ White on black background

Locking Brake ............................................................................................................................................................Refer to chart below

Weight ..................................................................................................................................................... Approximately 7 grams (1/4 oz.)

Set Screws ........................................................................................................................................ UNC-3A 4-40, 2 screws 120 º apart

Set Screw Tightening Torque ..................................................................................................................22.59 N-cm (2 lbs.-in.) minimum

Hex Key Size ............................................................................................................................................................................0.05 in. hex

Shaft Diameter Requirements ................................................................................................................................... Refer to chart below

Shaft Extension Beyond Panel ................................................................................................................... 15.75 mm (0.62 in.) minimum

Bushing Extension Beyond Panel ................................................................................................................ 9.02 mm (0.35 in.) maximum

Mechanical and Physical Characteristics

Shaft and Bushing Requirements

Number

Dimensional Drawings

How To Order

H-493-2

H-494-2

H-491-3

H-492-3

H-493-3

H-494-3

H-492-2

the potentiometer; they will not be used.

against panel. Tangs of washer should stick out from panel.

a. Shoulder on nut engages hold of anti rotation washer.

b. Tangs of anti-rotation washer are aligned vertically.

Part

This positions the turns-counting window properly.

25.4

(1.0)

3.18 mm (.125 in.)

6.35 mm (.250 in.)

3.18 mm (.125 in.)

DIA.

Accepts Shaft

Diameter

(.720)

18.29

BRAKE

RAD. MAX.

(.500)

(.440)

11.18

12.7

6.35 mm-32UNEF-2A

9.53 mm-32UNEF-2A

6.35 mm-32UNEF-2A

Fits Bushing Size

(.909

23.11

Features

■

H-490 Turns-Counting Dial

No backlash - mounted directly to

potentiometer shaft

For use with precision potentiometers or

other rotating devices up to 30 turns

Compact size - requires only 25.4 mm

diameter panel space

Available with or without brake

.029)

.76

Brake

Yes

5. Turn potentiometer shaft counterclockwise to minimum

6. Loosen set screw in knob of dial assembly. Set dial to “0.00”

7. Holding outer ring of dial assembly, engage locating tangs on

8. While holding outer ring, position unit lightly against panel.

Satin Chrome

Body Finish

resistance or voltage ratio. This is not necessarily at the end of

travel.

reading. Slip dial assembly over end of potentiometer shaft.

anti-rotation washer in notches on dial assembly.

Uniformly tighten knob set screws to potentiometer shaft with

furnished hex wrench.

Black

Customers should verify actual device performance in their speciﬁ c applications

*RoHS Directive 2002/95/EC Jan 27 2003 including Annex.

■

RoHS compliant*

Speciﬁ cations are subject to change without notice.

21.21 mm (0.83 in.) maximum

10.36

(.407)

DIA.

DIMENSIONS:

(INCHES)

REV. 10/08

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