H-492-3

H-492-3 Datasheet

H-490 Turns-Counting Dial

Part	Datasheet
H-492-3	H-492-3 (pdf)

Related Parts	Information
H-494-3	H-494-3

PDF Datasheet Preview
• No backlash - mounted directly to potentiometer shaft • For use with precision potentiometers or other rotating devices up to 30 turns • Compact size - requires only mm diameter panel space • Available with or without brake H-490 Turns-Counting Dial Mechanical and Physical Characteristics Number of Turns to 30 Dial Divisions per turn Readability - Over 10 Turns part in 1000 Torque With Brake Engaged g-cm 5 oz-in. minimum Markings on black background Locking to chart below Weight 7 grams 1/4 oz. Set Screws 4-40, 2 screws 120 º apart Set Screw Tightening Torque N-cm 2 lbs.-in. minimum Hex Key Size in. hex Shaft and Bushing Requirements Shaft Diameter Requirements to chart below Shaft Extension Beyond Panel mm in. minimum mm in. maximum Bushing Extension Beyond Panel mm in. maximum H-490 MOUNTING INSTRUCTIONS Discard standard mounting nut and lockwasher supplied with the potentiometer they will not be used. Insert potentiometer in panel. Using parts supplied with dial, position anti-rotation washer against panel. Tangs of washer should stick out from panel. Install mounting nut supplied with dial. Be sure: a. Shoulder on nut engages hold of anti rotation washer. b. Tangs of anti-rotation washer are aligned vertically. This positions the turns-counting window properly. Turn potentiometer shaft counterclockwise to minimum resistance or voltage ratio. This is not necessarily at the end of travel. Loosen set screw in knob of dial assembly. Set dial to reading. Slip dial assembly over end of potentiometer shaft. Holding outer ring of dial assembly, engage locating tangs on anti-rotation washer in notches on dial assembly. While holding outer ring, position unit lightly against panel. Uniformly tighten knob set screws to potentiometer shaft with furnished hex wrench. Dimensional Drawings 45 ° ± 10 ° BRAKE RAD. MAX. 30 ° ± 5 ° DIA. DIMENSIONS: MM INCHES ± ± How to Order H-493-2 H-494-2 H-491-3 H-492-3 H-493-3 H-494-3 H-492-2 Accepts Shaft Diameter mm in. mm in. mm in. mm in. mm in. mm in. mm in. Fits Bushing Size mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A Brake No Yes No Yes No Yes Body Finish Black Satin Chrome Satin Chrome Black Satin Chrome DIA.

PDF Datasheet Preview

• No backlash - mounted directly to potentiometer shaft
• For use with precision potentiometers or other rotating devices up to 30 turns
• Compact size - requires only mm diameter panel space
• Available with or without brake

H-490 Turns-Counting Dial

Mechanical and Physical Characteristics

Number of Turns to 30 Dial Divisions per turn Readability - Over 10 Turns part in 1000 Torque With Brake Engaged g-cm 5 oz-in. minimum Markings on black background Locking to chart below Weight 7 grams 1/4 oz. Set Screws 4-40, 2 screws 120 º apart Set Screw Tightening Torque N-cm 2 lbs.-in. minimum Hex Key Size in. hex

Shaft and Bushing Requirements

Shaft Diameter Requirements to chart below Shaft Extension Beyond Panel mm in. minimum
mm in. maximum Bushing Extension Beyond Panel mm in. maximum

H-490 MOUNTING INSTRUCTIONS

Discard standard mounting nut and lockwasher supplied with the potentiometer they will not be used.

Insert potentiometer in panel. Using parts supplied with dial, position anti-rotation washer
against panel. Tangs of washer should stick out from panel. Install mounting nut supplied with dial. Be sure:
a. Shoulder on nut engages hold of anti rotation washer. b. Tangs of anti-rotation washer are aligned vertically.

This positions the turns-counting window properly.

Turn potentiometer shaft counterclockwise to minimum resistance or voltage ratio. This is not necessarily at the end of travel.

Loosen set screw in knob of dial assembly. Set dial to reading. Slip dial assembly over end of potentiometer shaft.

Holding outer ring of dial assembly, engage locating tangs on anti-rotation washer in notches on dial assembly.

While holding outer ring, position unit lightly against panel. Uniformly tighten knob set screws to potentiometer shaft with furnished hex wrench.

Dimensional Drawings
45 ° ± 10 °

BRAKE RAD. MAX.
30 ° ± 5 °

DIA.

DIMENSIONS:

MM INCHES
± ±

How to Order

H-493-2 H-494-2 H-491-3 H-492-3 H-493-3 H-494-3 H-492-2

Accepts Shaft Diameter
mm in. mm in. mm in. mm in. mm in. mm in. mm in.

Fits Bushing Size
mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A mm-32UNEF-2A

Brake

No Yes No Yes No Yes

Body Finish

Black Satin Chrome Satin Chrome Black Satin Chrome

DIA.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived H-492-3 Datasheet file may be downloaded here without warranties.

Datasheet ID: H-492-3 522192