Velocity SmokeWatch VDOT-U5015 User manual

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
WARNING
Be sure to read and understand the entire instruction manual
before installing or operating the smoke detection system. Any
deviation from the recommendations in this manual may impair
system performance and compromise safety.
OVERVIEW
The SmokeWatch™ VDOT-U5015 Explosion Proof Smoke Detector
has Division and Zone explosion-proof ratings and is suitable for
industrial and commercial applications. The detector is designed to
operate effectively with smoldering and rapidly growing fires and
contains the ability to annunciate fault ensuring no undisclosed
failures. The SmokeWatch VDOT-U5015 Smoke Detector outputs
include 0-20 mA, a localized LED, and relays.
Typical applications that use the U5015 include:
•Combustible storage facilities
•Munitions manufacturing
•Volatile chemical storage
•Chemical processing plants
•Petroleum refineries
•Turbine enclosures
•Battery rooms
•HVAC applications
The hot-swappable sensor module is intrinsically safe and allows live
maintenance while under power, without de-classifying the
hazardous area.
The integrated junction box is available in a variety of port
configurations for simplified wiring and installation.
See Figure 1 for all the U5015 Smoke Detector components.
FEATURES
•FM Approved for use in Class I, Division 1 hazardous
locations
•FM Approved for smoke detection performance
•IECEx Zone approved
•Trouble-free photoelectric operation
•0-20 mA output for DCS integration
•Self-checking circuitry ensures reliable smoke detection
Alarm, Auxiliary, and Fault relays for controlling
•LED provides a visual indication that an alarm has occurred
•IP44 ingress protection level suitable for onshore or
offshore requirements
BENEFITS
•Ideally suited for classified areas in the petrochemical, oil,
and gas industry
•DCS, PLC, integration with milliamp or relay outputs
•Rugged design for environmental extremes
•Visual confirmation of detector alarm
•Detects smoldering fires
•No undisclosed failures

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
SPECIFICATIONS
OPERATING VOLTAGE—
12-30 Vdc (24 Vdc nominal)
SMOKE DENSITY—
1.5% - 2.5% obscuration per foot.
(4.9% - 8.2% obscuration per meter).
POWER CONSUMPTION—
3.5 watts maximum (2.75 Watts at 24 Vdc)
0.674 Watts with no relays energized.
1.23 Watts with one relay energized.
2.12 Watts with two relays energized.
2.68 Watts with three relays energized.
OUTPUT RELAYS—
Smoke alarm relay, Form C, 5 amperes at 30 Vdc:
The smoke alarm relay has normally open/ normally closed contacts
and normally de-energized operation.
Fault relay, Form A, 5 amperes at 30 Vdc:
The fault relay has normally open contacts and normally energized
operation.
Auxiliary relay, Form C, 5 amperes at 30 Vdc:
The auxiliary relay has normally open/normally closed contacts and
normally de-energized operation.
TEMPERATURE RANGE—
Operating: –20°C to +65°C (–4°F to +149°F)
Storage: –55°C to +70°C (–67°F to +158°F ).
HUMIDITY RANGE—
5 to 95% relative humidity.
INGRESS PROTECTION—
IP44
Note: Applicable to ceiling mount only
CURRENT OUTPUT—
0-20 mA (±0.3 mA) dc current, with maximum loop resistance of 300
ohms from 12-17.9 Vdc, 500 ohms from 18 to 19.9 Vdc, and 600 ohms
from 20-30 Vdc.
TERMINALS—
UL/CSA rated for 14-18 AWG or 2.5-0.75 mm2 wire.
THREAD OPTIONS—
3/4 inch NPT or M25.
Multi-port models available.
ENCLOSURE MATERIAL—
Polycarbonate / ABS - Smoke Detector.
Copper-free aluminum (painted) - Junction Box
SHIPPING WEIGHT (Approximate)—
7.85 lbs (3.56 kg).
WARRANTY PERIOD—
1 year.
DIMENSIONS—
See Figure 2.
CERTIFICATION—
For complete approval details, refer to the appropriate Appendix:
Appendix A - FM Appendix B - CSA Appendix C - IECEx
Appendix D - Additional Approvals
OPERATION
WARM UP
When the detector is initially powered up, a warm-up period of one
–two seconds is allotted for internal checks and communication.
During this time, the LED is off and the current level is 3 mA. After
the checks are completed, normal operation will be indicated by the
LED flashing every four seconds (current level is 4 mA).
If the detector is unable to reach the normal operating mode, the
warm-up period may extend to five seconds, followed by a critical
fault or an advisory fault (see Table 1 for all current levels). If the
problem persists, check for any loose wiring connections, ensure
that the voltage supply is sufficient, and cycle power if necessary.
OUTPUTS
Relays
The U5015 detector is furnished with smoke alarm, fault, and
auxiliary relays. All three relays are rated to 5 amperes at 30 Vdc.

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
The smoke alarm relay has a single set of terminals and normally
open / normally closed contacts, and normally de-energized
operation.
The fault relay has a single set of terminals and normally open
contacts, and normally energized operation.
The auxiliary relay has a single set of terminals and normally open /
normally closed contacts, and normally de-energized operation.
IMPORTANT
The auxiliary relay functions as pre-alarm.
0 to 20 mA Output
The U5015 provides a 0 to 20 mA dc current for transmitting
detector status information to other devices. The circuit is wired in a
non-isolated configuration and can drive a maximum loop resistance
of 300 ohms from 12 to 17.9 Vdc, 500 ohms from 18 to 19.9 Vdc,
and 600 ohms from 20 to 30 Vdc. Table 1 defines the current levels
and corresponding detector status. The output is calibrated at the
factory, with no need for field calibration.
NOTE
The output of the 0 to 20 mA current loop is monitored by the fault
detection circuitry of the U5015. Therefore, an open circuit on the
loop will cause the fault relay to change state.
An alarm will normally over-ride a fault, unless the nature of the
fault impairs the ability of the detector to generate or maintain an
alarm output (i.e., loss of operating power).
INTEGRAL WIRING COMPARTMENT
All external wiring to the device is connected within the integral
junction box. The detector is furnished with a maximum of four
conduit entries, with either 3/4 inch NPT or M25 threads.
LED
An LED, located on the detector (see Figure 1), indicates normal
operation and notifies personnel of an alarm. Table 2 indicates the
condition of the LED for each status.
LATCHING
A detector configured for latching operation will remain in an alarm
state indefinitely, after an alarm occurs.
NON-LATCHING
A detector configured for non-latching operation will check the alarm
status of the detector once every 10 seconds. Once smoke falls below
the alarm threshold, the alarm annunciation will clear within 10
seconds.
IMPORTANT
The latching or non-latching configuration must be specified
during order placement. It is not field configurable.
Only the alarm annunciation can be configured for latching
operation.
CONTINUOUS SELF-TEST
During normal operation, the detector performs the Self-Test
function automatically in the background once per second. During the
test, detection is not interrupted and no indication is given if the test
passed. If the test fails, a critical fault will occur. If degradation is
present and approaching critical levels, an advisory fault will occur.
MANUAL SELF-TEST
The Manual Self-Test function will immediately check the smoke
chamber optics for degradation. Once initiated, there will be a one
second delay before the result of the check is active. If there is a
failure, the LED will shut off immediately after the one second test
and a critical fault will occur. If the test passes, an alarm will be
annunciated while the LED remains active.
For a latching detector, the alarm will continue until power is cycled
to the unit. If the test passes, but there is degradation present and
approaching critical levels, an advisory fault will occur. For a non-
latching detector the alarm will clear after 10 seconds.
MAGNECTIC SWITCH
The magnetic switch is used to initiate the Manual Self-Test (see
Figure 3). Apply the magnet to the exterior housing and the LED will
light to indicate that the magnet is detected. The LED will remain lit
for at least one second during the test. After the initial delay, the
test status will be indicated as described in the "Manual Self-Test"
section.

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
IMPORTANT SAFETY NOTES
CAUTION
The wiring procedures in this manual are intended to ensure
proper functioning of the device under normal conditions.
However, because of the many variations in wiring codes and
regulations, total compliance to these ordinances cannot be
guaranteed. Be certain that all wiring complies with the NEC
as well as all local codes. If in doubt, consult the authority
having jurisdiction before wiring the system. Installation
must be done by a properly trained person.
CAUTION
This product has been tested and approved for use in
hazardous areas. However, it must be properly installed and
used only under the conditions specified within this manual
and the specific approval certificates. Any device modification,
improper installation, or use in a faulty or incomplete
configuration will render warranty and product certifications
invalid.
CAUTION
The device contains no user serviceable components. Service
or repair should never be attempted by the user. Device
repair should be performed only by the manufacturer.
CAUTION
The U5015 is to be installed in locations where the risk of
mechanical damage is low.
LIABILITIES
The manufacturer’s warranty for this product is void, and all
liability for proper function of the detector is irrevocably
transferred to the owner or operator in the event that the
device is serviced or repaired by personnel not employed or
authorized by Detector Electronics Corporation, or if the
device is used in a manner not conforming to its intended
use.
NOTE
Observe precautions for handling electrostatic sensitive
devices.
NOTE
The U5015 should not be installed in areas in which
Ammonia, Hydrogen Sulfide and Chlorine are normally
present.
INSTALLATION
WARNING
All entries must contain appropriately rated plugs or fittings.
It is required that each plug or fitting be wrench-tightened to
an appropriate installation torque and meet the minimum
thread engagement requirements per the applicable local
standards, codes, and practices in order to retain the defined
ratings. PTFE sealant or equivalent should be used on NPT
threads.
NOTE
Detector housings must be electrically connected to earth
ground. Internal and external earth ground terminals are
provided. For AEx (United States Zone) installations the
internal ground terminal shall be used for the equipment
grounding connection. The external terminal can be used for
supplementary bonding where local codes permit or require.
NOTE
The U5015 detector uses an internal Intrinsically Safe (I.S.)
Barrier. Proper NEC I.S. grounding must be ensured
GREASE/LUBRICATION
To ease installation and future removal, all threaded covers,
stopping plugs, and thread adapters must be installed using
thread lubricant. The recommended lubricant is a silicone-free
grease, available from Det-Tronics.
For devices with NPT threads, Teflon tape or thread seal
lubricant must be used for enhanced sealing capabilities.
IDENTIFICATION OF DETECTOR MOUNTING
LOCATIONS
The most effective number and placement of detectors varies
depending on the conditions on site. The individual designing
the installation must often rely on experience and sound
judgment to determine the detector quantity and best
locations to adequately protect the area. Note that it is
typically advantageous to locate detectors where they are
accessible for maintenance.
For additional information on detector location and spacing,
visit the National Fire Protection Association's website
(www.nfpa.org) and refer to the National Fire Alarm and
Signaling Code, NFPA 72.

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
PROTECTION AGAINST MOISTURE DAMAGE
It is important to take proper precautions during installation to
ensure that moisture will not come in contact with the electrical
connections of the system. The integrity of the system regarding
moisture protection must be maintained for proper operation and is
the responsibility of the installer.
If conduit is used, the use of proper conduit installation techniques,
breathers, glands, and seals is required to prevent water ingress
and/or maintain the explosion-proof rating.
Conduit drains must be installed at water collection points to
automatically drain accumulated moisture. Conduit breathers
should be installed at upper locations to provide ventilation and
allow water vapor to escape. At least one breather should be used
with each drain.
Conduit raceways should be inclined so that water will flow to low
points for drainage and will not collect inside enclosures or on
conduit seals. If this is not possible, install conduit drains above the
seals to prevent the collection of water or install a drain loop below
the detector with a conduit drain at the lowest point of the loop.
POWER SUPPLY REQUIREMENTS
Calculate the total detection system power consumption rate in
watts from cold start-up. Select a power supply with adequate
capability for the calculated load. Ensure that the selected power
supply provides sufficient regulated and filtered output power for
the entire system. If a back-up power system is required, a
float-type battery charging system is recommended. If an existing
source of power is being used, verify that system requirements are
met.
TRANSPORT COVER
The Transport Cover (see Figure 4) keeps dust and particles out of
the smoke chamber that may enter during transport, handling, or
installation. It should remain fastened on the detector through the
installation process.
IMPORTANT
Remove the cover only after installation is complete and prior to
powering the detector for the first time.
MOUNTING LOCATION OPTIONS
Ceiling Mount
The U5015 is intended for surface mounting. It is normally mounted
on the ceiling no less than six inches from a side wall (See Figure 5).
The exact location of the detector must be determined by an
evaluation based on engineering judgement, or if possible, by field
tests.
Wall Mount
The U5015 can also be mounted on a side wall (See Figure 6). The
exact location of the detector must be determined by an evaluation
based on supplemented engineering judgement, or if possible, by
field tests.
IMPORTANT
Whenever possible, select a mounting orientation where the LED is
visible to personnel within the area.
MOUNT THE DETECTOR
Using three No. 8 flat head screws (or equivalent) placed through
the counter bored holes in the detector flange, secure the detector
junction box to the surface location.
WIRING CABLE REQUIREMENTS
Always use proper temperature rated cabling type and diameter for
input power as well as output signal wiring. 14 to 18 AWG shielded
stranded copper wire is recommended.

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
The field wiring terminal connections are certified for a single wire in
size from 0.2 to 2.5 mm2 (or two conductors with same cross section
0.2 to 0.75 mm2). The screws must be tightened down with a torque
0.4 to 0.5 N•m. The metal housing must be electrically connected to
earth ground.
A minimum of 12 Vdc must be present at the U5015 to ensure
proper operation. The maximum cable length from power source to
U5015 is 2000 feet. When the U5015 Smoke Detector is mounted
remotely using an STB termination box, maximum cable length from
U5015 to STB is 500 feet.
WARNING
For field connections, use wires/cables that are rated at 20°C
greater than the maximum ambient temperature.
NOTE
In applications where the wiring is installed in conduit, dedicated
conduit is recommended. Avoid low frequency, high voltage, and
non-signaling conductors to prevent nuisance EMI problems.
JUMPER
Depending on the wiring option that is used, jumpers may be
required. See Table 3 for the Jumper Usage Guide and Figures 12 to
15 for wiring examples.
WIRING PROCEDURE
Ensure that all cables are terminated properly. Conductor insulation
should be stripped off with a bare conductor length of 0.2 inch (5 mm)
minimum and 0.7 inch (18 mm) maximum. Ensure that cable shield is
properly terminated and that bare shield wire is not allowed to
accidentally contact the metal housing or any other wire.
Use the following instructions when wiring the U5015 detector:
1. Slightly loosen the three setscrews located on the retaining ring
(see Figure 7).
2. Unscrew the retaining ring to gain access to the wiring terminals
(see Figure 8), and complete the installation of the system conduit.
Feed the external wiring through the remaining junction box entry
or M25 to 3/4 inch adapter. When installing the junction box, use
care not to damagethe wires and refrain from twisting them.
3. Connect the external wiring to the appropriate terminals.
•Figure 9 shows the wiring terminals.
•Figure 10 shows the ground lug locations.
•Figures 12 and 13 show wiring for single detector
configurations.
•Figures 14 and 15 show wiring for multiple detector
configurations.
4. Re-install the assembly. Use the alignment guide (see Figure 11)
to align the retaining ring with the junction box.
5. Screw the retaining ring on to the junction box and re-tighten the
three setscrews.

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
MAINTENANCE
WARNING
To avoid a potential electrostatic discharge (ESD), do not wipe or
rub the surface of the VDOT-U5015 sensor module.
NOTE
The VDOT-U5015 Smoke Detector contains no user serviceable
components and should never be opened. The VDOT-U5015
wiring compartment is the only part of the smoke detector that
should be opened by the user in the field.
ROUTINE INSPECTION
Regularly scheduled maintenance is not required, however the U5015
cover and smoke chamber should be inspected periodically when
detectors are located in abnormally dirty or dusty environments. to
ensure the smoke chamber is not blocked by dirt or debris
The smoke detector can be tested using the same methods
employed for any photo-electric detector. It is recommended using
a test aerosol smoke dispenser for periodic maintenance of the
detector.

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VDOT-U5015 Explosion Proof Smoke Detector

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VDOT-U5015 Explosion Proof Smoke Detector

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VDOT-U5015 Explosion Proof Smoke Detector

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector
The detector is not designed to be repaired in the field. If it is
determined that the problem is caused by an electronic defect, the
device must be returned to the factory for repair. The sensor module
is field replaceable in case of dirtiness, damage, or failures incurred in
the field.
Prior to returning devices, contact the Velocity Detection office so
that a Return Material Authorization (RMA) number can be assigned.
A written statement describing the malfunction must accompany
the returned device or component to assist and expedite finding the
root cause of the failure.
Pack the unit properly. Always use sufficient packing material. Where
applicable, use an antistatic bag as protection from electrostatic
discharge.
NOTE
Velocity Detection reserves the right to apply a service charge for
repairing returned product damaged as a result of improper
packaging.
Return all equipment via transportation prepaid to the factory in the
United Kingdom

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector

www.velocitydetection.com Doc: GLT-311-7-1 Issue: 001 Date: 28/10/2020
VDOT-U5015 Explosion Proof Smoke Detector