Linear =
mm
inches
4.8
0.18
31.8
1.25
25.4
1.00
38.1
1.50
6.4
0.25
59.9
2.36
9.5
0.375
Drill and Tap #10-24 x 3/8" deep
to accept #10 button head screws
included with Thinswitch® limit switch
Cable
Liquid-Resistant THINSWITCH
Schematic Diagram
Normally
Closed
(red)
Normally
Open
(black)
Common
(white)
®
U.S. Patent Nos.
5,446,252
6,982,392
Installation and Operating Instructions
Applies to T-222-LR & HT-291-LR
General
The Thinswitch® Limit Switch verifies ejector plate return when tied
into the machine control. Placed next to the rest buttons in a mold,
the switch protects the mold from premature closure after part
ejection.
Installation
Install the Thinswitch® as follows:
1. Check height of rest buttons. If button height is
ess than .1875" (4.76mm), machine a pocket to
l
accept the switch to match rest button height.
The actuation spring should extend above the
rest button.
2. The switch may be positioned in any direction.
3. Verify that any rest buttons on the ejector plate
will not interfere with the switch, wire clips, or
wire routing.
The Thinswitch® can also be used with a bolt or pin actuator with a
minimum diameter of 3/8" (9.5mm). Care should be taken to avoid
crushing the housing with the actuator.
The Liquid-Resistant Thinswitch is designed to operate in conditions
where occasional water or oil spray is present. Do not immerse the
switch or subject it to direct, continuous liquid spray.
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.
4. Drill and tap two mounting holes 10-24 x 3/8"
(9.5mm) deep per drawing.
5. Verify switch contact operation before placing
mold in service.
6. Wire switch in accordance with prevailing
electrical standards. Wire switch directly to the
injection molding machine controls or to an
approved locking male plug. An electrical
receptacle can be mounted to the molding
machine for convenience.
4500 E 142nd Street • Grandview, MO 64030 • Tel. (816) 878-6675 • Fax (816) 878-6683 • www.smartflow-usa.com
Form #156 (12.14)
shown actual size
Operation
.250" (6.4mm) Max.
Actuation Height
.188" (4.8mm) Min.
Actuation Height
Rest Button
Thinswitch®
Spring Under
Dome
Ejector Housing Base
• The operating point of the switch is adjusted by
turning the set screw shown below.
• Minimum actuation height is .188" (4.7mm),
Maximum recommended actuation height is
.250" (6.4mm).
• Each 1/4 turn of the adjusting screw changes
actuation height .012" (0.3mm).
• Adjust the actuation height to .010" - .015"
(.25mm - .38mm) above minimum actuation
height.
Before shipment, all switches are
calibrated to optimum actuation
position.
Premature spring and switch
failure may result by adjusting the
operating point more than .020"
(.5mm) above minimum actuation
height.
Specifications
Rated current is dependent upon operating temperature. A lower
operating temperature allows more current safely through the
Thinswitch® cable. See the table below for details.
Rated Current (Resistive) vs. Operating Temperature
T-222-LR HT-291-LR
Amps °F °C Amps °F °C
5.0 85 29.4 5.0 100 37.7
4.0 120 49.0 4.5 155 68.3
3.0 155 68.3 4.0 210 98.8
2.0 175 79.4 3.5 250 121.1
Above rated current is resistive. Maximum inductive current is 4A.
Switching Element Contacts..........Form C - SPDT
Component Materials
Body ................................................Fiberglass-Reinforced Nylon
Spring ..............................................Stainless Steel
Back Cover......................................Polyester Film
Protective Dome..............................Polyethylene
Wire Leads ......................................22ga stranded
3 conductor, shielded
cable, 6ft. (1.8m) long,
ends stripped and tinned
adjusting
set screw
Limited Warranty
Seller warrants that this product supplied will conform to the description herein stated and that the product will be of
standard quality. This is the sole warranty made by Seller with respect to this product. Seller expressly disclaims any other
express or implied warranties, including, but not limited to, the implied warranty of merchantability and the implied
warranty of fitness for a particular purpose.
Seller shall not be liable for any cost or damages, whether direct, incidental or consequential, including, but not limited to,
any injury, loss or damage resulting from the use of this product, regardless of whether any claim for such cost or damages
is based on warranty, contract, negligence, tort or strict liability. The sole liability of Seller is limited to repairing or
replacing this product.
This warranty shall not apply to any products that have been repaired or altered by anyone other than Seller. The warranty
shall not apply to any products subject to misuse due to common negligence or accident, nor to any products manufactured
by Seller which are not installed or operated in accordance with the printed instructions of Seller or which have been
operated beyond the rated capacity of the goods.
2 800-764-3518
burger & brown engineering, inc.
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