Instructions 95-8600
xWatch® Explosion-Proof Camera
Model X7050
3.1 Rev: 3/12 95-8600
Table Of Contents
DESCRIPTION ............................................1
FE ATURES ...............................................1
GENERAL APPLICATION INFORMATION .......................2
SPECIFICATIONS ..........................................3
IMPORTANT SAFETY NOTES ................................4
INSTALLATION ............................................4
Protection Against Moisture Damage ........................4
Camera Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Camera Mounting .......................................5
Wire Size and Type ......................................5
Wiring Procedure .......................................6
Aiming the Camera ......................................7
Leveling the Camera .....................................7
CONVERTING A C7050 FLAME DETECTOR TO A MODEL X7050
CAMERA .................................................8
TROUBLESHOOTING ......................................9
Replacing the xWatch Camera Module ......................9
MAINTENANCE ...........................................9
Cleaning ..............................................9
O-Rings ...............................................9
DEVICE REPAIR AND RETURN .............................10
ORDERING INFORMATION .................................10
Accessories ..........................................10
Replacement Parts .....................................10
Assistance ...........................................10
xWatch Model Matrix ...................................11
APPENDIX A – FM / CSA APPROVAL .........................12
APPENDIX B – ATEX / IECEx APPROVAL ......................13
INSTRUCTIONS
Important
Be sure to read and understand the entire
instruction manual before installing or
operating the system. Any deviation from the
recommendations in this manual may impair
system performance and compromise safety.
Description
The xWatch® Explosion-Proof Camera Model X7050
produces a high resolution color video picture
using a camera module that is mounted inside
an explosion-proof NEMA 4X rated housing. The
device’s explosion-proof rating makes it suitable for
Class I, Div. 1, Groups B, C and D locations. The
camera can be used alone or in combination with fire
and gas detectors in any application that requires
CCTV surveillance capabilities.
The xWatch Camera can be used in any of three
configurations:
• It can be used as a stand alone device to perform
typical CCTV functions.
• The camera module can be retrofitted in place of the
UV tube module in an existing C7050 Flame Detector
to provide basic visual information.
• The camera can be ordered from the factory as a
combined unit with any X-Series flame detector. With
this arrangement, the camera and detector share the
same field of view.
In the event of a fire or gas alarm, the operator can
immediately view the monitored area to determine
whether personnel are present and safe. An accurate
evaluation of the hazard’s size, nature, location and
severity can be determined quickly and safely.
The use of a digital video recorder (DVR) to capture the
event provides a permanent record for future analysis of
what occurred.
xWatch
®
Explosion-Proof Camera
Model X7050
Features
• Low cost surveillance of any flame, gas, or toxic
hazard location
• Parallel, non-interfering operation with hazard
detection system
• Easy connection to a video switcher using twisted
pair wiring
• Use existing wiring if suitable
• Easy retrofit into standard C7050 housing
• Simple no tool exchange of the tube module to
camera
• Compact housing for easy installation in small
spaces
• 3 lens options (wide, normal, or narrow) for flexible
field-of-view:
– Wide lens emulates a flame detector’s field of view
– Normal lens is ideal of monitoring general areas
– Narrow lens enables up-close viewing
• Ideally suited for remote and/or inaccessible areas
• Informed, appropriate response to incidents
• Pre- and post-event analysis of video recording
95-860013.1 ©Detector Electronics Corporation 2012 Rev: 3/12 95-8600
General application
inFormation
The xWatch Explosion-Proof Camera Model X7050 has
a balanced differential video output for driving a long
distance twisted pair signal to a remote site for monitoring
and/or recording. The video output format can be either
NTSC (National Television Systems Committee) or PAL
(Phase Alternating Line).
The video driver of the camera is designed for use with
twisted pair cable of 100 ohm impedance. The best
video performance in terms of distance, video quality,
and cost is attained using 22 AWG to 16 AWG, twisted
pair cable of 100 ohm impedance.
POWER
VIDEO
The monitor end must terminate the video cable with 100
ohms. Since most monitors have a built-in termination
resistor of 75 ohms instead of 100 ohms, a balun or other
matching network (video converter) must be used.
A variety of matrix control systems or DVRs can be suitable
for viewing or recording the video signal, depending
on the requirements of the individual application. The
detector’s auxiliary relay contacts are typically used to
signal the video system of an alarm event.
Refer to Figure 1 for a schematic of a typical system.
B2338
DVR
ETHERNET
(Optional)
Figure 1—System Block Diagram
CCTV MONITOR
OR PC
3.1 95-86002
speciFications
APPROVED
CERTIFICATIONS—
OPERATING TEMPERATURE—
–20°C to +70°C
HAZARDOUS LOCATION RATING—
–40°C to +75°C
STORAGE TEMPERATURE—
–30°C to +80°C
RELATIVE HUMIDITY—
5 to 95%, non-condensing
INGRESS PROTECTION—
NEMA/Type 4X
SENSOR—
Color low light CCD, 0.3 lux
RESOLUTION—
NTSC: 768 by 494 pixels, 570 lines of resolution
PAL: 752 by 582 pixels, 570 lines of resolution
VIDEO OUTPUT—
NTSC or PAL two wire twisted pair, unshielded,
Category 5
SHUTTER—
Electronic shutter, 1/60 – 1/100,000 second
FM
®
For complete approval details for the xWatch Explosion
Proof Camera Model X7050, refer to the appropriate
Appendix:
Appendix A - FM/CSA
Appendix B - ATEX/IECEx.
1/2 INCH NPT
OR 20 MM
A2330
Figure 2— xWatch Camera Dimensions in Inches (Centimeters)
2.5 (6.4) DIAMETER
4.75 (12.06)
120° ± 2 (2)
2.5
(6.35)
OPERATING VOLTAGE—
24 Vdc nominal, 18 to 30 Vdc
POWER CONSUMPTION—
2.8 watts
FIELD OF VIEW OPTIONS—
– 90 degrees, 2.33 mm lens, wide angle to match field
of view of flame detector.
– 50 degrees, 4.33 mm lens, normal angle for general
duty.
– 30 degrees, 8.0 mm lens, narrow angle for focus on
a specific point of interest.
(NOTE: FOV degrees are approximates)
USER INTERFACE—
Conventional off-the-shelf video switchers or digital
video recorders (DVR) can be used for the interface.
HOUSING MATERIAL—
Aluminum or 316 Stainless Steel
SHIPPING WEIGHT (Approximate)—
Aluminum: 1.2 pounds (0.6 kg)
Stainless Steel: 2.2 pounds (1.0 kg)
DIMENSIONS—
See Figures 2, 3 and 4.
2.0 (5.1) DIAMETER
2-1/2
(6.4)
DETECTOR LOCK NUT
Figure 3—Dimensions of Q9001A Aluminum Mounting Bracket
3/4 INCH NUT USED TO SECURE
XWATCH TO SWIVEL MOUNT
1/2 INCH NUT USED TO ADJUST
ELBOW TO DESIRED ANGLE
1-3/8 INCH NUT USED TO ROTATE
SWIVEL/CAMERA ASSEMBLY TO DESIRED POSITION
MOUNTING BASE
Figure 4—Dimensions of Q9001H Stainless Steel Mounting Bracket
in Inches (Centimeters)
in Inches (Centimeters)
45° (2)
0.25 (.64) DIAMETER (3)
POSITIONING SWIVEL NUT
A2368
2.5
(6.4)
5.25
(13.3)
A2370
3.1 95-86003
important saFety notes
installation
WarnIng
Do not open the camera assembly in a hazardous
area when power is applied. The device contains
no serviceable components and should not be
opened, except during installation and setup.
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 ordinances. If
in doubt, consult the authority having jurisdiction
before wiring the system.
attentIon
Observe precautions for handling electrostatic
sensitive devices. Do not plug the camera module
into the base with power applied.
CautIon
Installation and wiring of the Model X7050 Camera
should be performed only by qualied personnel.
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 or components 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, 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 camera
with a conduit drain at the lowest point of the loop.
Conduit seals are not required for compliance with
explosion-proof installation requirements, but are highly
recommended to prevent water ingress in outdoor
applications. Units with M25 thread must use an IP66
washer to prevent water ingress.
3.1 95-86004
CAMERA LOCATION
Cameras should be positioned to provide the best
unobstructed view of the area to be monitored. If the
camera is to monitor the same area as the detector,
it should be mounted as close to the detector as
practical. The following factors should also be taken into
consideration:
• Be sure that the unit is easily accessible for cleaning
and other periodic servicing.
• Care must be taken to ensure that dirt, moisture or
other contaminants will not accumulate on the lens
and obscure the vision of the camera. If possible,
point the camera slightly downward.
• The camera should be mounted on a rigid surface in
a low vibration area.
• The camera should not be placed where rising
combustion products can obscure its vision. If
dense smoke is expected to accumulate at the onset
of a fire, the camera should be mounted on a side
wall at least a few feet (approximately 1 meter) down
from the ceiling.
CAMERA MOUNTING
Install the swivel mounting bracket assembly on the wall.
The installation surface should be free of vibration and
suitable to receive 1/4 inch (M6) screws with a length of
at least 1 inch (25 mm), and have sufficient capacity to
hold the camera and bracket weight.
WIRE SIZE AND TYPE
General
The preferred wiring system for the xWatch Camera
Model X7050 utilizes unshielded twisted pair for the
video signal. Power wiring requires a wire gauge large
enough to ensure that 18 Vdc is available to the device
at all times.
NOTE
In applications where the wiring cable is installed
in conduit, the conduit must not be used for wiring
to other electrical equipment.
Video Cable Considerations
Proper video cable will ensure that the best quality video
is displayed on a remote monitor. Because composite
video frequencies span the range of 25 Hz to 6 MHz,
most cables will display transmission line characteristics.
Ensure that the same cable type (impedance) is used
throughout the entire length. For example, do not mix
twisted pair cable and coaxial cable without using a
balun for matching. In addition, the monitor end must
be properly terminated. Failure to properly implement
the video cabling system may result in smearing (loss
of detail) and/or loss of color and/or loss of picture sync.
The camera employs a balanced differential video
driver designed to drive twisted pair cable of 100 ohm
impedance. The best video performance in terms of
distance, video quality, and cost is attained using a 22
AWG to 16 AWG unshielded twisted pair cable of 100
ohm impedance. The wiring can be Category 2 or better,
stranded or solid.
The monitor end must terminate the video cable with 100
ohms. Most monitors have a built in termination resistor.
If the monitor uses 75 ohms instead of 100, a balun or
other matching network must be used.
There are manufacturers who support driving many
types of cable systems using active transceivers that
compensate for cable losses.
Galvanic isolation of the video may also be necessary
to avoid horizontal bars caused by line frequency
interference. This may be accomplished using isolating
active transceiving systems or passive video isolation
transformers/baluns. Specify a baseband video isolation
system with a frequency response of at least 25 Hz to 6
MHz. Small cable TV transformers will generally not work
as their frequency response is not low enough.
Power Cable Considerations
To ensure proper operation, a minimum of 18 Vdc is
required at the terminal block of the camera, considering
a worst case current draw of 0.156 Amps (2.8 Watts).
3.1 95-86005
WIRING TERMINAL BLOCK
INDEX PIN
CAMERA MODULE
TERMINAL CAP
QUICK CONNECT PLUG (4)
Figure 5—Exploded View of xWatch Camera
WIRING PROCEDURE
CautIon
Power must not be applied to the device while
opening the housing or while plugging in or
removing the module.
1. Disassemble the enclosure by turning the housing
cover counterclockwise. See Figure 5 for an
illustration of the camera assembly.
2. Carefully remove the camera module.
3. Connect the external wiring to the screw connectors
marked A-, B-, C-, and D- on the camera terminal
block. See Figure 6.
O-RING (2)
HOUSING COVER
A2366
4. Check all field wiring to be sure that the proper
connections have been made.
5. Using the index pin as a guide, install the camera
module on the terminal block.
6. Re-assemble the device housing.
7. Make the final sighting adjustments and ensure that
the mounting bracket hardware is tight.
VIDEO – (A)
QUICK CONNECT PLUG (4)
VIDEO + (D)
Important
Do not test any wiring connected to the camera
with a meg-ohmmeter. Disconnect wiring at
the camera before checking system wiring for
continuity.
3.1 95-86006
A2365
POWER + (B)
Figure 6—xWatch Camera Wiring Terminal Block
INDEX PIN
POWER – (C)
AIMING THE CAMERA
In installations where the Model X7050 Camera is used
for monitoring the same hazardous area as a single
detector, the recommended procedure for ensuring
that the camera is correctly aligned with the detector’s
cone of vision is to use a Cone of Vision Tester (Laser
Aimer) available from Detector Electronics Corporation
(Det-Tronics®).
1. Using the COV tester, locate the center of the
detector’s field of view. (Refer to the instruction
manual provided with the COV tester for complete
information regarding its use.)
2. Place the COV tester on the camera. Loosen the
mounting bracket, then adjust the center of the
camera’s field of view to match the center of the
detector’s field of view.
The COV tester can also be used to locate the outside
edge of the field of view.
LEVELING THE CAMERA
If the image on the monitor does not appear to be level,
this can be corrected by rotating the camera module
within the xWatch Camera.
1. Remove the housing cover from the xWatch Camera.
See Figure 5.
2. Loosen the setscrew on the side of the camera
module. See Figure 7.
3. Align the two notches on the face of the module so
that they are level with the horizon or until the image
on the monitor looks level.
4. When proper orientation has been achieved,
carefully tighten the setscrew. Do not overtighten.
LOOSEN SETSCREW
USING 5/64 INCH ALLEN WRENCH
TURN RING TO ALIGN THE TWO NOTCHES
LEVEL WITH HORIZON OR UNTIL IMAGE IS LEVEL
Figure 7—xWatch Camera Module
A2369
3.1 95-86007
convertinG a c7050 Flame
Detector to a moDel X7050
camera
The Model X7050 Camera module can be installed in
place of the UV tube module in an existing C7050 Flame
Detector to provide basic visual monitoring capability.
3. Remove the existing UV module from the C7050
detector.
4. Disconnect the existing wiring at the controller.
Connect the grounding strap between the new
index pin and the terminal mounting screw per the
instructions. See Figure 9.
CautIon
Under no circumstances can 290 Vdc be applied
to the camera.
1. Provide the correct wiring to the C7050/X7050
location as described in “Wire Size and Type” in the
Installation section of this manual.
CautIon
Power must not be applied to the device while
opening the housing or while plugging in or
removing the module.
2. Disassemble the enclosure by turning the housing
cover counterclockwise. See Figure 8 for an
illustration of the xWatch Camera assembly.
INDEX PIN
TERMINAL BLOCK
REMOVE EXISTING
UV SENSOR TUBE MODULE
Important
Do not test any wiring connected to the xWatch
Camera with a meg-ohmmeter. Disconnect wiring
at the camera before checking system wiring for
continuity.
5. Check all field wiring to be sure that the proper
connections have been made.
6. Using the index pin as a guide, install the xWatch
Camera module on the terminal block.
7. Re-assemble the device housing.
8. Make the final sighting adjustments and ensure that
the mounting bracket hardware is tight.
A
GROUNDING STRAP
D
SCREW
HOUSING COVER
INSTALL xWATCH CAMERA MODULE
IN PLACE OF EXISTING UV MODULE
B2331
Figure 8—Converting C7050 Flame Detector to X7050 Camera
NOTE: REQUIRES REWIRING TO VIDEO EQUIPMENT.
B
INDEX PIN
Figure 9—X7050 Camera Terminal Block
C
A2388
3.1 95-86008
troubleshootinG
maintenance
The xWatch Camera 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.
NOTE
It is highly recommended that spare modules
be kept on hand for eld replacement to ensure
continuous protection.
REPLACING THE XWATCH CAMERA MODULE
CautIon
Power must not be applied to the device while
opening the housing or while plugging in or
removing the module.
1. Disassemble the enclosure by turning the housing
cover counterclockwise. See Figure 5 for an
illustration of the xWatch Camera assembly.
2. Remove the existing camera module.
3. Using the index pin as a guide, install the new camera
module on the terminal block.
4. Check the housing O-rings and service as required
(see Maintenance section of this manual for details).
Re-assemble the device housing.
5. Check camera sighting and ensure that the mounting
bracket hardware is tight.
6. Clean the camera lens if required.
CLEANING
The camera requires no periodic calibration or servicing.
However, the camera lens should be cleaned on a regular
basis.
Clean the camera lens using a clean cloth or tissue
and Det-Tronics window cleaning solution (part number
001680-001). If a stronger solution is needed, isopropyl
alcohol may be used.
O-RINGS
Rubber O-rings are used on the Model X7050 Camera
housing to ensure the watertight integrity of the device.
It is imperative that these O-rings be properly installed
and in good condition. Failure to properly maintain these
rings can allow water to enter the housing and cause
premature failure.
When the housing cover is removed, the O-rings should
be inspected for breaks, cracks, or dryness. If cracks
are visible, the O-ring should be replaced. If they feel
dry to the touch, a thin coating of lubricant should be
applied. When re-installing the O-rings, be sure that they
are properly seated in the groove on the housing.
A coating of lubricant should also be applied to the
threads on the housing before reassembly. This will both
lubricate the threads and help to prevent moisture from
entering the housing.
CautIon
O-rings should be lubricated with a silicone-free
grease (such as p/n 005003-001 available from
Det-Tronics). If catalytic type combustible gas
sensors are being used anywhere on the premises,
silicone based lubricants should never be used,
since inadvertent use of a silicone lubricant on
or near the combustible gas sensor will cause
irreversible damage to the sensing element.
3.1 95-86009
Device repair anD return
Prior to returning devices, contact the nearest local
Detector Electronics office so that a Return Material
Identification (RMI) number can be assigned. A
written statement describing the malfunction must
accompany the returned device or component to
assist and expedite nding 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
Det-Tronics reserves the right to apply a service
charge for repairing returned product damaged as
a result of improper packaging.
Return all equipment transportation prepaid to the factory
in Minneapolis.
REPLACEMENT PARTS
Part Number Description
009448-003 Model DE2020N –
Replacement Camera Module, 2.33 mm, NTSC
009448-004 Model DE2020P –
Replacement Camera Module, 2.33 mm, PAL
009448-005 Model DE2022N –
Replacement Camera Module, 4.3 mm, NTSC
009448-006 Model DE2022P –
Replacement Camera Module, 4.33 mm, PAL
009448-007 Model DE2023N –
Replacement Camera Module, 8.0 mm, NTSC
009448-008 Model DE2023P –
Replacement Camera Module, 8.0 mm, PAL
107427-004 Rubber O-rings
001680-001 Window cleaner squeeze bottle
(package of six bottles)
005003-001 Silicone-free grease
orDerinG inFormation
When ordering, please specify:
xWatch Explosion Proof Camera Model X7050
Refer to the xWatch Model Matrix below for details.
ACCESSORIES
Swivel Mount Bracket is required for mounting the
camera:
– Q9001B1175 Aluminum Mounting Bracket
(p/n 002099-003)
– Q9001H8001 Stainless Steel Mounting Bracket
(p/n 004404-002)
Q1201A Laser Holder/Laser is used for sighting the
flame detector and xWatch Camera. The Laser Holder
easily attaches to the front of the detector or camera.
The Laser projects a red laser beam to show the exact
center of the field of view. Additional laser positions are
provided to show the outside edges of the field of view.
ASSISTANCE
For assistance in ordering a system to meet the needs of
a specific application, contact:
Detector Electronics Corporation
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Operator: (952) 941-5665 or (800) 765-FIRE
Customer Service: (952) 946-6491
Fax: (952) 829-8750
Web site: www.det-tronics.com
E-mail: det-tronics@det-tronics.com
3.1 95-860010
xWATCH MODEL MATRIX
MODEL DESCRIPTION
X7050 xWatch Explosion Proof Camera
TYPE MATERIAL
A Aluminum
S Stainless Steel (316)
TYPE THREAD TYPE
1E 1/2’ NPT
1F M20
TYPE VIDEO OUTPUT
50 NTSC
51 PA L
TYPE FIELD OF VIEW
1 Wide FOV (90°), 2.3 mm Lens*
2 Normal FOV (50°), 4.3 mm Lens
3 Narrow FOV (30°), 8.0 mm Lens
TYPE APPROVALS
W FM/CSA/ATEX/CE/IECEx
TYPE CLASSIFICATION
2 Division/Zone Ex d
*This lens emulates the 90° field of view
to match the X-Series Flame Detectors
3.1 95-860011
appenDiX a
FM / CSA APPROVAL
FM CERTIFICATION
CERTIFICATE OF COMPLIANCE - Hazardous (Classified) Location Electrical Equipment
Explosion-proof for Class I, Division 1, Groups B, C, and D; and dust ignition-proof for Class II/III, Division 1,
Group E, F, and G T5 Ta = 75°C hazardous (classified) locations, indoors and outdoors (Type 4X).
APPLICABLE STANDARDS
Electrical and Electronic Test, Measuring and Process Control Equipment, Class 3810, 2005.
Electrical Equipment for Use in Hazardous (Classified) Locations, General Requirements, 3600, 1998.
Explosionproof Electrical Equipment, General Requirements, 3615, 2006.
Enclosures for Electrical Equipment, ANSI/NEMA 250, 2003.
CSA
CERTIFICATION
CLASS 4818 01 - SIGNAL APPLIANCES - Systems - For Hazardous Locations
Class I, Division 1, Groups B, C, and D (T5); Class II/III, Division 1, Groups E, F, and G (T5); Enclosure NEMA/Type 4X;
xWatch Model X7050 Video Camera, NTSC or PAL system video output, rated 18-30 Vdc, 2.8 Watts maximum.
APPLICABLE REQUIREMENTS
CSA Std C22.2 No. 25-1996
CSA Std C22.2 No. 30-M1986
CAN/CSA C22.2 No. 94-M91
CSA Std C22.2 No. 142-M1987
–
Enclosures for use in Class II Groups E, F & G Hazardous Locations.
–
Explosion-Proof Enclosures for use in Class I Hazardous Locations.
–
Special Purpose Enclosures.
–
Process Control Equipment.
3.1 95-860012
ATEX CERTIFICATION
0539
Ex d IIC T5 Gb
FM07ATEX0053
T5 (Tamb = –40°C to +75°C)
IP66.
II 2 G
appenDiX b
ATEX / IECEx APPROVAL
EN Standards:
Special Conditions for Safe Use:
None.
IECEX CERTIFICATION
Certificate of Conformity
IECEx FMG 07.0019
Ex d IIC T5 Gb
T5 (Tamb = –40°C to +75°C)
IP66.
IEC Standards:
EN 60079-0: 2009
EN 60079-1: 2007
EN 60529: 1991+A1: 2000.
IEC 60079-0: 2007
IEC 60079-1: 2007
IEC 60529: 2001.
3.1 95-860013
X3301 Multispectrum
95-8600
IR Flame Detector
PointWatch Eclipse®
IR Combustible Gas Detector
Detector Electronics Corporation
6901 West 110th Street
Minneapolis, MN 55438 USA
T: 952.941.5665 or 800.765.3473
F: 952.829.8750
®
Universal Display
FlexVu
w/ GT3000 Toxic Gas Detector
Det-Tronics, the DET-TRONICS logo, Protect•IR, and Automatic Optical Integrity (oi) are registered trademarks or trademarks of Detector Electronics
Corporation in the United States, other countries, or both. Other company, product, or service names may be trademarks or service marks of others.
Eagle Quantum Premier
Safety System
®
© Copyright Detector Electronics Corporation 2012. All rights reserved
W: http://www.det-tronics.com
E: det-tronics@det-tronics.com
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