LIMIT SWITCHES Thinswitch ® Liquid-Resistant Limit Switch
T222LR & HT291LR MODELS SPECIFICATIONS
ELECTRICAL: 250VAC
U.S. Patents 5,446,252 and 6,982,392
5 AMPS RESISTIVE 4 AMPS INDUCTIVE (MAX) 5 AMPS RESISTIVE 4 AMPS INDUCTIVE (MAX)
28VDC (SEA LEVEL)
OPERATING TEMPERATURE: T222LR STANDARD MODEL
175°F MAX (79.4°C MAX) HT291LR HIGH TEMPERATURE MODEL 250°F MAX (121°C MAX) SWITCHING: SPDT MATERIALS BODY:
FIBERGLASS-REINFORCED NYLON
POLYURETHANE POLYESTER FILM
DOME:
BACK COVER: WIRE LEADS:
22 GA STRANDED, 3-CONDUCTOR, SHIELDED CABLE, 6 FT. (1.8M) LONG, ENDS STRIPPED AND TINNED
General Description Thinswitch ® Liquid-Resistant Limit Switch is designed to verify ejector plate return in areas where occasional water or oil spray is present. The Thinswitch helps prevent accidental mold close in injection molding applications by providing a position switch that is tied to the injection molding machine control. The liquid resistant switch uses the same mounting hole locations as the original Thinswitch. The Thinswitch has been tested for reliability over 10 million cycles without failure. Two switches can be used in series for larger molds to ensure the ejector plate return, preventing costly mold damage. Features and Benefits • Over 10 million cycle life • 175°F (79.4°C) standard temperature rating • 250°F (121°C) high-temperature unit for higher temperature needs • Adjustable actuation between .187" and .250" from the mold base • 3 ⁄ 16 " thick design fits snugly behind the ejector plate between the rest buttons • Stripped and tinned 6 ft. wire leads • Mounting screws and wire clips included
The Thinswitch ® Limit Switch is designed for use in very low power mold protection control circuits. It is not intended to switch heavy loads in power applications.
RATED CURRENT (RESISTIVE) VS. OPERATING STEEL TEMPERATURE
T222LR
HT291LR
AMPS
°F 85
°C
AMPS
°F
°C
5.0 4.0 3.0 2.0
29.4 49.0 68.3 79.4
5.0 4.5 4.0 3.5
100 155 210 250
37.7 68.3 98.8
120 155 175
121.1
Thinswitch Spring Under Dome ®
6.4mm/.250in Max Actuation Height
Rest Button
Ejector Housing Base
4.8mm/.188in Min Actuation Height
38.1mm/1.50in 25.4mm/ 1.00in
6.4mm/0.25in
9.5mm/ 0.375in
31.8mm/ 1.25in
59.9mm/ 2.36in
NOTE: Design and
specifications are subject to change without notice.
4.8mm/ 0.188in
NOTE: P remature spring and switch failure may result by adjusting the operating point more than .020" (.5mm) before the end of the ejector plate stroke.
CABLE
DRILL AND TAP #10-24 x 3/8" DEEP TO ACCEPT #10 BUTTON HEAD SCREWS INCLUDED WITH THINSWITCH ® LIQUID RESISTANT LIMIT SWITCH
180
U.S. 800-626-6653 ■ Canada 800-387-6600 ■ Mexico 52-442-713-5666 ■ dme.net ■ store.dme.net.
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