Safety Technology International STI Stopper II Data Sheet
FIRE PRODUCTS
ADA
®
STI STOPPER II
Compliant
SEE REVERSE
FOR DETAILS
®
STI-1100
PRODUCT OVERVIEW
This protective cover has been helping to stop false fire alarms around the world for
more than 40 years, without restricting legitimate alarms. All models offer excellent
protection against physical damage (both accidental and intentional) and several
against severe environments both inside and out. It is ideal for schools, colleges,
hospitals, nursing homes, stores, hotels and public buildings of almost every kind
where there is a threat of false alarms.
HOW IT WORKS
Stopper II consists of a clear, tamperproof, tough polycarbonate shield and frame, but
the line includes models with the option of a piezo horn, spacer, Form “C” dry relay
contact and gaskets. The cover accommodates most manual pull stations. When the
Stopper II with horn is lifted to gain access to the protected alarm, a piercing selfcontained 95 or 105 dB warning horn (at one foot) sounds. Immediate attention is
drawn to the area and a prankster will either run or be caught. The cover is connected
to the frame by a cable. When the cover is lifted, it drops off of the frame and a horn
will sound (models with horn) until the cover is snapped back onto the frame or for the
life of the battery.
KEY FEATURES
General Information
· Proven effective for more than
40 years in helping stop false fire
alarms without restricting legitimate
alarms.
· Can be used as a guard against
physical damage to a manual pull
station, with or without the optional
warning horn.
· Three year guarantee against
breakage of polycarbonate in
normal use (one year on electro
mechanical and electronic
components).
Design
· Larger sizes and surface mounted
pull stations accommodated with
STI-3100 conduit spacer.
· Weather models have closed cell
gaskets.
· The Stopper II design is a registered
trademark of Safety Technology
International, Inc.
Construction
· UL Listed to U.S. and Canadian
safety standards (also for custom
labeling).
Installation
· When covering a pull station
outside, UL requires stations to be
listed for outdoor use.
· Typical working proper ties of
polycarbonate are -40° to 250°F
(-40° to 121°C).
Electronics
· Power source is a 9V DC alkaline
battery included on standard
Stopper II ( remote powered unit
available).
Options
· Optional horn has a choice of 95 or
105 dB at one foot.
· Standard red units have “In Case
of Fire...” label unless specified with
“no label” or “custom label” (extra
charge for custom label).
STI Stopper II
COVER
COVER
8.875 in.
(225mm)
6 in.
(152mm)
5.37 in.
(137mm)
8.875 in.
(225mm)
7.4 in.
(188mm)
5.34 in.
(136mm)
2 in.
(51mm)
.5 in.
(13mm)
3.175 in.
(81mm)
1 in.
(25mm)
3.175 in.
(81mm)
2 in.
(51mm)
10.07 in.
(256mm)
®
Dimensions and Technical Information
MODELS AVAILABLE
Stopper II® Models Indoor Use
STI-1100* H
ST I -113 0 * H With horn and spacer
ST I-1200* H Without horn flush mount
STI-1230*H Without horn with spacer
Weather Stopper® with gaskets (Indoor/Outdoor rated)
ST I -115 0 *
ST I -115 5 * With horn surface mount and gaskets
ST I-1250 * Without horn flush mount and gaskets
STI-3 150*H Without horn surface mount and gaskets
Accessories
KIT-316
KI T-H19 015 Two 3/32” Allen wrenches
KIT-M02002 Clear Frame for Stopper II Series
STI-1102 Replacement horn for cover with alarm
ST I-1280 Backplate
STI-3002 Weather gasket
With horn for flush mount
With horn flush mount and gaskets
Louvers for STI-3100
APPROVALS & WARRANTY
TESTING
It has been tested and approved or listed by:
· UL/cUL Listed No. S2466
· For fire alarm applications, UL38 requires outdoor listed stations for
outdoor use
· State of California (obtain local fire marshal approval)
· MEA 49-00-E (STI-1200)
· Flush models ADA Compliant. Surface models ADA Compliant for
operation (UL Certified No. S2466)
· Weather Stopper
of IP54.
· The indoor/outdoor rated station covers, when mounted on a
smooth sur face, provide a rain tight seal similar to a 3R enclosure
rating.
WARRANTY
Three year guarantee against breakage of polycarbonate in normal
use (one year on electro mechanical and electronic components).
STI-3003 Conduit gasket
STI-3004 Rigid conduit gasket
STI- 3100 2” conduit spacer with a frame, ½” or ¾” conduit entry
STI- 3104 2” conduit spacer with ½” or ¾” conduit entry
(includes one ¾” conduit entry gasket)
Add -NR for no label on horn housing
*
Add -CR for custom label on horn housing
Add -FR for French labeling
Add -ES for Spanish labeling
HAvailable in a 6-pack (STI-1100 & STI-1130 also in a 12-pack)
IMPORTANT NOTICE
Stopper II “FIRE” models are intended to be used in areas where
the incidence of false fire alarms from manual pull stations is high or
has proven to be a serious problem. Any disadvantage of this device
is more than balanced when one considers the consequences of
false fire alarms, especially if fire service personnel and equipment
are responding to a false fire alarm when they are needed for a real
fire somewhere else. Add to this the disruption to the facility when
false alarms occur. If you have, or may have, a problem with false
fire alarms or physical/weather damage to your fire alarm activation
devices, the Stopper II could prove invaluable.
HORN HOUSING
SPACER
SPACER
COVER
5.37 in.
(137mm)
6 in.
MODELS WITH HORN (STI-1100 Series)
COVER
MODELS WITHOUT HORN (STI-3150 Series)
(152mm)
8.875 in.
(225mm)
SIDE VIEW
5.34 in.
(136mm)
7.4 in.
(188mm)
8.875 in.
(225mm)
SIDE VIEW
(25mm)
(51mm)
(13mm)
2 in.
(51mm)
1 in.
2 in.
.5 in.
3.175 in.
(81mm)
3.175 in.
(81mm)
*WARNING: ! For RC models: UL Listing does not permit relay
contacts to connect to the fire alarm or a life safety function.
The power supply for horns, according to UL Listing, cannot
be connected to a UL Listed fire alarm system. For electrical
specifications see install book. RC models contain one set of Form
“C” dry contacts. Contacts rated 30 VAC/VDC 1 amp.
EXTERNAL DIMENSIONS: • Flush 7.2 W x 10.2 H x 3.3 D in. (183x259x84mm)
• Surface 7.2 W x 10.2 H x 5.5 D in. (183x259x140mm)
®
versions designed to meet the requirements
3 in.
(76mm)
4 in.
(102mm)
5.5 in.
(140mm)
6.81 in.
(173mm)
5 in.
(127mm)
.78 in.
(20mm)
1.61 in.
(41mm)
2.32 in.
(59mm)
SPACER ADDS
2” DEPTH (50mm)
ALL MODELS END VIEW
2.73 in.
(70mm)
3.18 in.
(81mm)
Printed in U.S.A., © 1987-2009 Safety Technology International, Inc.
Printed in U.S.A., © 1987-2017 Safety Technology International, Inc.
04/11Subject to change without notice.
10/ 19Subject to change without notice.
10/ 20Subject to change without notice.Printed in U.S.A., © 1987-2020 Safety Technology International, Inc.
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