Federal Signal Corporation 151XST Series Manual

256822J
REV. J 613
Printed in U.S.A.
Model 151XST Series Strobe Light
for Use in Hazardous Conditions
Installation and
Maintenance Manual
français...............page 21
español...............página 43

Warranty – Seller warrants all goods for ve years on parts and 2-1/2 years on labor,
under the following conditions and exceptions: Seller warrants that all goods of
Seller's manufacture will conform to any descriptions thereof for specications which
are expressly made a part of this sales contract and at the time of sale by Seller such
goods shall be commercially free from defects in material or workmanship. Seller
reserves the right at the Seller’s discretion to “Repair and Return” or “Replace” any
item deemed defective during the warranty period. This warranty does not cover
travel expenses, the cost of specialized equipment for gaining access to the product,
or labor charges for removal and reinstallation of the product. This warranty shall be
ineffective and shall not apply to goods that have been subjected to misuse, neglect,
accident, damage, improper maintenance, or to goods altered or repaired by anyone
other than Seller or its authorized representative, or if ve years have elapsed from
the date of shipment of the goods by Seller with the following exceptions: lamps
and strobe tubes are not covered under this warranty. Outdoor warning sirens and
controllers manufactured by Federal Warning Systems are warranteed for two years
on parts and one year on labor. No agent, employee, representative or distributor
of Seller has any authority to bind the Seller to any representation, afrmation, or
warranty concerning the goods and any such representation, afrmation or warranty
shall not be deemed to have become a part of the basics of the sales contract and shall
be unenforceable. THE FOREGOING WARRANTIES ARE EXCLUSIVE AND IN
LIEU OF ALL OTHER WARRANTIES OR MERCHANTABILITY, FITNESS FOR
PURPOSE AND OF ANY OTHER TYPE, WHETHER EXPRESS OR IMPLIED.
These warranties shall not apply unless Seller shall be given reasonable opportunity
to investigate all claims for allegedly defective goods. Upon Seller's instruction a
sample only of allegedly defective goods shall be returned to Seller for its inspection
and approval. The basis of all claims for alleged defects in the goods not discoverable
upon reasonable inspection thereof pursuant to paragraph 8 hereof must be fully
explained in writing and received by Seller within thirty days after Buyer learns of
the defect or such claim shall be deemed waived.
Industrial Systems
2645 Federal Signal Drive • University Park, IL 60484-3167
Tel: [phone] • Fax: [phone]
Email: [email protected] • www.federalsignal-indust.com
© 2013 Federal Signal Corporation. All rights reserved.

Models 151XST and 151XST-S
3
Contents
Safety Messages to Installers ..........................................................5
An Overview of the 151XST Series ..................................................6
Unpacking the Light..........................................................................7
Pipe-Mounting the Beacon (151XST)...............................................9
Surface-Mounting the Beacon (151XST-S)....................................10
Wiring the Beacon........................................................................... 11
Wiring the AC Models............................................................ 12
Wiring the DC Models ........................................................... 14
Safety Message to Maintenance Personnel..................................14
Replacing the Flash Tube ....................................................... 16
Replacing the Printed Circuit Board (PCB) ........................... 17
Cleaning the Fixture ............................................................... 18
Lubricating the Threaded Joint ............................................... 18
Getting Repair Service or Technical Assistance .........................19
Ordering Accessories and Replacement Parts ............................19
Returning the Product for Credit ...................................................20
Tables
Table 1 Specications ........................................................................7
Table 2 Voltage and operating current ...............................................7
Table 3 Flash rate and candelas ........................................................8
Table 4 Hazardous Location Rating ...................................................8
Table 5 Replacement parts ..............................................................19
Table 6 Accessory ............................................................................20

4
Models 151XST and 151XST-S
Contents
Figures
Figure 1 Pipe-mounted beacon .......................................................10
Figure 2 Surface-mounted beacon .................................................. 11
Figure 3 Cross section of beacons ..................................................13
Figure 4 Normal (A) and darkened (B) ash tube ............................17

5
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Safety Messages to Installers
It is important to follow all instructions shipped with this product.
This device is to be installed by a trained electrician who is
thoroughly familiar with the National Electrical Code and/or
Canadian Electrical Code and will follow the NEC and/or CEC
Guidelines as well as all local codes. This beacon should be
considered a part of the warning system and not the entire warning
system.
The selection of the mounting location for the beacon, its controls
and the routing of the wiring are to be accomplished under the
direction of the facilities engineer and the safety engineer. In
addition, listed below are some other important safety instructions
and precautions you should follow:
• Read and understand all instructions before installing or
operating this beacon.
• Never alter the beacon in any manner. Safety in hazardous
locations may be endangered if additional openings or other
alterations are made to units specically designed for use in
these locations.
• Do not connect this beacon to the system when power is on.
• After installation, ensure that the set screw is properly
tightened and that threaded joints are fully engaged.
• After installation, test the beacon to ensure that it is operating
properly.
• After testing is complete, provide a copy of this instruction
booklet to all operating personnel.
• Establish a procedure to routinely check the light installation
for integrity and proper operation.

6
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Failure to follow all safety precautions and instructions may result
in property damage, serious injury, or death.
An Overview of the 151XST Series
Federal Signal’s Model 151XST hazardous location strobe light
provides 80 high-intensity ashes per minute. This warning light is
available in 12-24 Vdc, 120 Vac and 240 Vac, 50/60 Hz.
The Model 151XST strobe light is UL Listed and CSA Certied
for Class I, Division 2, Groups A, B, C and D; Class II, Division 1,
Groups E, F and G; and Class III.
The 151XST meets Type 4X water-tight, dust-tight, and corrosion-
resistant requirements; constructed to IP66. This hazardous
location warning light has an aluminum base, coated for corrosion
resistance that is ready for mounting on a 3/4-inch NPT pipe.
The included dome guard ts over the glass dome to protect it
against accidental collision with moving equipment, such as
forklifts. An optional wall bracket is also available.
The 151XST has an effective candela (ECP) of 165 and a 520,000
peak candela. It is available in six dome colors, including amber,
blue, clear, green and red (magenta upon request).
Federal Signal’s rugged 151XST strobe warning light is
specically designed for hazardous locations or corrosive
environments where a very bright visual signal is required.
This warning light can be used for plant evacuation or other
communication needs.
Models are available for pipe mounting (151XST) or surface
mounting (151XST-S).
NOTE: The Model 151XST can be mounted to a Federal
Signal Model LHWB bracket. If installed in this way, the entire
assembled device is suitable only for Class I, Div. 2, Groups A, B,
C, and D; Class II, Div. 2, Groups F and G; Class III locations.

7
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Unpacking the Light
EXPLOSION HAZARD—Damaged domes can lead to
explosions that could result in serious injury or death.
After unpacking the beacon, examine it for damage that may
have occurred in transit. If the beacon has been damaged, do not
attempt to install or operate it. File a claim immediately with
the carrier, stating the extent of the damage. Carefully check all
envelopes, shipping labels, and tags before removing or discarding
them. Disposal of all shipping materials must be carried out in
accordance with national and local codes and standards. If any
parts are missing, please call Federal Signal Customer Support at
708-534-4756 or 877-289-3246.
Table 1 Specications
Lamp Life: 10,000 hours
Light Source: Strobe tube
Operating
Temperature:
-67 °F to 150 °F
(-55 °C to 65.6 °C)
Net Weight: 3.8 lb (1.7 kg)
Shipping Weight: 4.5 lb (2.0 kg)
Height: 9.25 in (234.95 mm)
Diameter: 5.5 in (139.7 mm)
Table 2 Voltage and operating current
Model Voltage Operating
Current
151XST(-S) 012-024__ 12-24 Vdc 1.3 A to 0.60 A
151XST(-S)-120__ 120 Vac, 50/60 Hz 0.35 A
151XST(-S)-240__ 240 Vac, 50/60 Hz 0.16 A
__ Indicates color: (A) amber, (B) blue, (C) clear, (G) green, (M) magenta
or (R) red.

8
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Table 3 Flash rate and candelas
Model Flash Rate
per Minute
Candela
Peak1ECP2
151XST(-S) 012-024__ 80 520,000 165
151XST(-S)-120__ 80 520,000 165
151XST(-S)-240__ 80 520,000 165
__ Indicates color: (A) amber, (B) blue, (C) clear, (G) green,
(M) magenta or (R) red.
1Peak candela is the maximum light intensity generated
by a ashing light during its light phase.
2ECP (Effective Candela) is the intensity that would appear
to an observer if the light were burning steadily.
Table 4 Hazardous Location Rating
Temperature Code at Maximum Temperature, °C
Hazardous Location 66 ºC
Class I, Div 2, Groups A, B, C & D T1/301º
Class II, Div 1, Groups E, F & G T5/100º
Class III T5/100º
To reduce the risk of re or explosion, do not install the beacon
in a hazardous location if the operating temperature exceeds the
ignition temperature of hazardous atmosphere.
Before proceeding, use Table 4 above as a guide and determine
that the unit’s operating temperature DOES NOT exceed the
hazardous atmosphere’s ignition temperature.
For marine applications, all wiring including supply wire must be
stranded wire and meet the USCG (CFR46) Sections (110-113).
NOTE: In high-humidity environments when units are mounted
dome down, condensation may occur in the conduit system. Use
properly rated conduit seals/drains to prevent moisture from
entering the xture.

9
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Pipe-Mounting the Beacon (151XST)
EXPLOSION HAZARD—To reduce the risk of re or explosion,
do not install the beacon in a hazardous location if the
operating temperature exceeds the hazardous atmosphere’s
ignition temperature. Before proceeding, consult the product
nameplate and determine the operating temperature of the
beacon.
NOTE: To comply with NEC Section 300-14, which requires a
minimum of 6 inches (15.25 cm) of free conductor at a junction,
when mounting the Model 151XST, the mounting pipe used to join
the unit to a splice box should be no longer than 10 in (25.4 cm).
The Model 151XST has provisions for mounting a 3/4" pipe and
can be mounted in any position.
1. Before mounting the beacon, ensure that the mating threads
are clean.
2. To prevent the ingress of water and dust, apply conductive
sealant to the conduit threads prior to mounting. If non-
conductive sealant is used, the enclosure must be earthed
via the provided internal grounding wire/grounding screw to
ensure proper grounding continuity (Figure 3 on page 13).
3. See Figure 1 on page 10. Thread the xture onto the 3/4-inch
pipe and secure it with the set screw.

10
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Figure 1 Pipe-mounted beacon
151XST LIGHT
ASSEMBLY
SET SCREW
3/4" NPT PIPE
290A6904
Surface-Mounting the Beacon (151XST-S)
To surface mount the beacon:
1. See Figure 2. Use the mounting base as a template to mark the
location of the two mounting holes.
2. Drill a 9/32-inch (7.143 mm) hole at each mark.
3. Secure the beacon to the mounting surface with installer
supplied hardware.

11
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Figure 2 Surface-mounted beacon
151XST-S LIGHT
ASSEMBLY
DRILL TWO 9/32 in
(7.143 mm) HOLES
MOUNTING SURFACE
290A6905
INSTALLER-SUPPLIED
MOUNTING HARDWARE
Wiring the Beacon
The Model 151XST Series Beacon should be installed per the
NEC or CEC, STATE and LOCAL CODES. Alternate installation
locations and/or orientations should only be performed with the
approval of the authority having jurisdiction. In addition, the unit
can be mounted using an optional ceiling mount or optional wall
mount.
NOTE: The 120 Vac or 230-240 Vac strobe units are designed
to operate on both 50 Hz and 60 Hz electrical power. Special
modications are NOT required for the two different AC line
frequencies.

12
Installation and Maintenance Instructions
Models 151XST and 151XST-S
SHOCK HAZARD—To avoid electrical shock hazards, do not
connect wires while power is applied.
EXPLOSION HAZARD—Do not disconnect the beacon while
the circuit is live or unless the area is known to be free of
ignitable concentrations. Keep the beacon tightly closed
when in operation.
REVERSE POLARITY/MISWIRING—Although the 151XST
is not polarity sensitive, it MAY BE DAMAGED by incorrect
electrical hookup. Damage will result if the voltage rating of
the particular model is exceeded.
NOTE: Wiring must comply with the National Electrical Code
or Canadian Electrical Code and the local authority having
jurisdiction.
Wiring the AC Models
The AC models have two 24-inch leads, one black and one
white. To wire the AC beacon:
1. Ensure that power is off.
2. Remove the threaded dome assembly by twisting it
counterclockwise.
3. Connect the black lead to the phase (hot) side of the power
source and the white lead to the common (neutral) side of
the AC power source.
4. If required, the green screw in the housing is provided
for connection to an earth ground (Figure 3 on page 13).
To gain access to the screw, remove the power supply
assembly.
5. Secure the dome to the base of the beacon.

13
Installation and Maintenance Instructions
Models 151XST and 151XST-S
6. Connect power to the beacon and test it for proper
operation.
Figure 3 Cross section of beacons
207.8 mm
(8.18 in)
165.6 mm (6.52 in)
2 x 3/4" NPT
ENTRY
DOME GUARD
(INCLUDED)
ALUNIMUM BASE
ALUMINUM
BASE
3/4" NPT PIPE MOUNT
290A7397
139.7 mm (5.5 in)
(9.25 in)
234.95 mm
FLASH TUBE
FLASH TUBE
GLASS DOME ASSY.
DOME GUARD
(INCLUDED)
GLASS DOME ASSY.
GASKET
GASKET
POWER WIRES
POWER WIRES
SET SCREW
GROUND
SCREW
GROUND SCREW
MODEL 151XST-S
MODEL 151XST

14
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Wiring the DC Models
The DC units have two 24-inch leads, one black and one red.
To wire the DC beacon:
1. Ensure that power is off.
2. Remove the threaded dome assembly by twisting it
counterclockwise.
3. Connect the red (+) lead to the positive side of the power
source and the black (–) lead to the negative side of power
source.
4. If required, the green screw in the housing is provided for
connection to an earth ground. To gain access to the screw,
remove the power supply assembly.
5. Secure the dome to the base of the beacon.
6. Connect power to the beacon and test it for proper operation.
Safety Message to Maintenance Personnel
Listed below are some important safety instructions and
precautions you should follow:
• Read and understand all instructions before operating this
system.
• Any maintenance to the light system must be done with power
turned off.
• Any maintenance to the light system must be performed
by a trained electrician who is thoroughly familiar with all
applicable national and local codes in the country of use.
• Do not connect this beacon to the system when power is on.
• Do not disconnect the beacon while the circuit is live or unless
the area is known to be free of ignitable concentrations. Keep
the beacon tightly closed when in operation.

15
Installation and Maintenance Instructions
Models 151XST and 151XST-S
• Never alter the unit in any manner. Safety of the unit may be
affected if additional openings or other alterations are made to
the internal components or housing.
• The nameplate should NOT be obscured, as it contains
cautionary and/or other information of importance to
maintenance personnel. Ensure the nameplate remains readable
if the housing exterior is painted.
• If the dome is damaged in any way, it MUST be replaced.
• After performing any maintenance, test the light system to
ensure that it is operating properly.
Failure to follow all safety precautions and instructions may result
in property damage, serious injury, or death.
Servicing the Beacon
EXPLOSION HAZARD—To prevent ignition of hazardous
atmospheres, disconnect the xture from the supply circuit
before opening it.
EXPLOSION HAZARD—Do not disconnect the beacon while
the circuit is live or unless the area is known to be free of
ignitable concentrations. Keep the beacon tightly closed
when in operation.
EXPLOSION HAZARD—To maintain the vapor-tight enclosure,
do not damage the globe or threads while disassembling or
reassembling the unit. Lubricated threaded joints exposed
for long periods of time may attract small particles of dirt or
other foreign materials. Housing and cover joints should be
reassembled immediately, with all the threads fully engaged.

16
Installation and Maintenance Instructions
Models 151XST and 151XST-S
SHOCK HAZARD—High voltages are present inside the light
assembly. Wait at least 5 minutes after shutting off the power
before servicing this unit.
Establishing a regular maintenance and inspection schedule
extends the life of the Model 151XST and ensures safety. For
service, support, or replacement parts, see pages 19 and 20.
Replacing the Flash Tube
As strobe lights are used, the ash tubes begin to darken,
causing the light output to decrease. This darkening is
characteristic of ash tubes. Darkening will begin near the base
of the tube and progress upward. Also, as ash tubes age, they
may have a tendency to misre (not re periodically).
After extended operation, occasionally check for ash tube
degradation. Should the ash tube misre, have a noticeable
decrease in light output, glow continuously or darken to a
point beyond that shown in Figure 4 on page 17, it should be
replaced.
To replace the ash tube:
1. Disconnect power to the beacon and wait at least 5 minutes
to allow all capacitors to discharge.
2. Remove the threaded dome assembly by twisting it
counterclockwise.
3. With the dome removed, gently pull the ash tube from its
socket. A rocking motion is most helpful when installing or
removing the tube.
4. Replace the ash tube. Ensure that the replacement tube is
fully seated in the socket.
5. Replace the globe assembly. Ensure that the globe
assembly is seated securely against the gasket.

17
Installation and Maintenance Instructions
Models 151XST and 151XST-S
6. Test the beacon for proper operation.
Figure 4 Normal (A) and darkened (B) ash tube
A B
290A7396
Replacing the Printed Circuit Board (PCB)
To replace the PCB:
1. Disconnect the power to the beacon and wait at least 5
minutes to allow all capacitors to discharge.
2. Remove the threaded dome assembly by twisting it
counterclockwise.
3. Remove and retain the screw that secures the circuit board
to the housing.
4. Disconnect power to the PCB:
a) To replace a Series A1 PCB, disconnect the two supply
wires from the old circuit board and connect them
to the mating side of the supplied adapter assembly.
Connect the other side of the adapter assembly to the
new circuit board.
b) To replace a Series A2 circuit board, disconnect the
power connector from the old circuit board and connect
it to the connector on the new circuit board.
NOTE: Ensure that the connector is fully seated on the
circuit board connectors.

18
Installation and Maintenance Instructions
Models 151XST and 151XST-S
5. Secure the new circuit board to the housing with the screw
removed in step 2.
6. Install the new ash tube in the socket. Ensure that the ash
tube is fully seated in the socket.
7. Replace the globe assembly. Ensure that the globe
assembly is seated securely against the gasket.
8. Test the light for proper operation.
Cleaning the Fixture
EXPLOSION HAZARD—Never use an abrasive material
or le to remove corrosive materials from threaded
surfaces. In extremely corrosive locations, equipment
should be periodically inspected to guard against unusual
deterioration and possible porosity, since this may weaken
the enclosure structurally.
Maintenance procedures sometimes require xtures to be hosed
down for good housekeeping. The circuit should be turned off
prior to hosing down the xture.
The xture should be cleaned periodically to maintain
maximum light output. Only mild, non-abrasive cleaning agents
should be used. The glass globe should be regularly inspected
for scratches and chips, and if damaged, MUST be replaced.
Lubricating the Threaded Joint
The threaded joint on the cover should be kept well lubricated
with a corrosion inhibiting grease such a petrolatum or soap-
thickened mineral oil. If corrosive materials have accumulated
on the threaded joints and cannot be removed with solvents, the
parts should be discarded and replaced.

19
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Getting Repair Service or Technical Assistance
Products returned for repair require a Return Authorization form
from your local distributor or from Federal Signal. To obtain
repair service or technical assistance from Federal Signal, call
708-534-4756 or 877-289-3246. For instruction manuals and
information on related products, visit:
http://www.federalsignal-indust.com
Ordering Accessories and Replacement Parts
EXPLOSION HAZARD—Substitution of components may
impair suitability for Class I, Division 2.
Typical spare parts are listed in Table 4. Due to certication,
certain component parts are not available for eld replacement.
Units with this type of damage must be either replaced entirely or
returned to Federal Signal for service. To order accessories and
replacement parts, please call Federal Signal Customer Support at
708-534-4756 or 877-289-3246.
Table 5 Replacement parts
Description Part Number
Dome Assy., Red K8449078
Dome Assy., Amber K8449078-01
Dome Assy., Clear K8449078-04
Dome Assy., Blue K8449078-06
Dome Assy., Green K8449078-07
Dome Assy., Magenta K8449078-05
Gasket K8449080
Grease, 8 oz Tube KR81-05-01
Dome Guard K8449090
Power Supply Assy., 12-24 Vdc K2001173
Power Supply Assy., 120 Vac K2001071
Power Supply Assy., 240 Vac K2001071-01
Flash Tube K149122

20
Installation and Maintenance Instructions
Models 151XST and 151XST-S
Table 6 Accessory
Description Model
Hazardous Location Wall-Mount Bracket LHWB*
* Cannot be used in Class II, Division 1 applications. NEMA 4X and IP66
rated when used with the appropriate conduit ttings.
Returning the Product for Credit
Product returns for credit require a return authorization from your
local distributor prior to returning the product to Federal Signal.
Please contact your distributor for assistance.
A product is qualied to be returned for credit when the following
conditions are met:
• Product is resalable and in the original cartons
• Product has not been previously installed
• Product is the current revision
• Product has not been previously repaired
• Product is a standard product
• Product is not a service part
All returns are subject to a re-stock fee.
Defective products that are returned within the warranty period
will be repaired or replaced at Federal Signal’s sole discretion.
Defective products do not include those products with lamp
failure.
Circumstances other than those listed above will be addressed on a
case-by-case basis.
Industrial Systems
2645 Federal Signal Drive • University Park, IL 60484-3167
Tel: [phone] • Fax: [phone]
Email: [email protected] • www.federalsignal-indust.com