Sentry Industries 5000 User Manual
MODEL 5000
S E N T R Y
GAS MONITORING SYSTEM
Version 6
APPLICABILITY & EFFECTIVITY
Effective for all Sentry systems manufactured after September 1, 1995.
Instruction Manual Part Number T12001-A1
SMC sierra monitor corporation Sentry Instruction Manual - Version 6
FMRC APPROVAL
ONLY THE FOLLOWING ITEMS, FUNCTIONS AND OPTIONS ARE FMRC* APPROVED
Sentry Model 5000 Gas Monitoring System
Controllers
Model 5000-02 Two Channel Controller
Model 5000-04 Four Channel Controller
Model 5000-08 Eight Channel Controller
Controller Options:
Model 5380-00
Rack Mount Configuration
Sensor Module
Model 5100-02 Combustible Gas Sensor Module
Model 5100-05 Hydrogen Sulfide Sensor Module - EC Cell
Calibration Equipment
Model 1200-26 Calibration Gas Delivery System
Model 1290-02 Combustible Gas Cylinder
Model 5358-00 Calibration Head, Magnetic
Model 5358-01 Calibration Head, Standard
Model 5360-00 Calibration Gas Delivery Fitting
Notes:
1) FMRC Approval applies only to conventional (one cable run per sensor module) or
multiplexed (multiple sensor modules per cable) installations. Apparatus must be
installed in accordance with National Electrical Code.
2) FMRC Approval of the RS232C Data Output option applies only if used as a printer
port and the apparatus connected to the controller does not use or generate greater
than 250 Vrms.
Model 5383-00
Model 5387-00
Model 5392-00
NEMA-4X Configuration
Printer Output Software
Individual Alarm Relays
3) FMRC Approval for Hydrogen Sulfide Sensor Module applies to Model 5100-05
electrochemical cell only. Model 5100-01 solid state sensor is not approved.
4) FMRC Approval allows the presence of MODBUS firmware in the Sentry controller
but does not cover the operation of the MODBUS firmware itself.
*FMRC: Factory Mutual Research Corporation
SMC sierra monitor corporation Sentry Instruction Manual - Version 6
TABLE OF CONTENTS
1. PRODUCT DESCRIPTION.............................................................................................................................................1
1.1 GENERAL.......................................................................................................................................................................1
1.2 CONTROLLER...............................................................................................................................................................1
1.2.1 ENHANCEMENT PACKAGE ...............................................................................................................................1
1.3 SENSOR MODULES......................................................................................................................................................1
1.4 INTERCONNECT WIRING...........................................................................................................................................2
1.5 DATA TRANSMISSION................................................................................................................................................2
1.6 POWER REQUIREMENTS............................................................................................................................................2
2. CAUTIONS & WARNINGS...........................................................................................................................................15
2.1 INTRODUCTION.........................................................................................................................................................15
2.2 CONTROLLER.............................................................................................................................................................15
2.3 WIRING ........................................................................................................................................................................15
2.4 SENSOR MODULES - GENERAL..............................................................................................................................15
2.4.1 COMBUSTIBLE SENSOR MODULES...............................................................................................................15
3. INSTALLATION.............................................................................................................................................................17
3.1 CONTROLLER LOCATION........................................................................................................................................17
3.2 SENSOR MODULE LOCATIONS..............................................................................................................................17
3.3 WIRING ........................................................................................................................................................................17
3.4 SENSOR MODULE INSTALLATION ........................................................................................................................18
3.5 CONTROLLER INSTALLATION ...............................................................................................................................19
3.5.1 CONTROLLER CONFIGURATIONS .................................................................................................................19
3.5.2 CONTROLLER MOUNTING...............................................................................................................................19
3.5.3 ALARM DEVICE INSTALLATION....................................................................................................................20
3.5.4 RELAY OUTPUTS...............................................................................................................................................20
3.5.5 DC POWER LOAD...............................................................................................................................................20
3.5.6 POWER UP ...........................................................................................................................................................21
3.5.7 POWER DOWN....................................................................................................................................................21
4. CONFIGURATION PROCEDURE...............................................................................................................................33
4.1 INTRODUCTION.........................................................................................................................................................33
4.2 START-UP PREPARATION........................................................................................................................................33
4.3 CONFIGURATION INSTRUCTIONS.........................................................................................................................35
4.4 SENTRY TRAINING....................................................................................................................................................35
4.5 SENTRY MENU...........................................................................................................................................................37
4.5.1 TEST KEY.............................................................................................................................................................37
4.5.2 TIME KEY ............................................................................................................................................................37
4.5.3 RESET KEY..........................................................................................................................................................38
4.5.4 MODE KEY - CALIB/CHANGE..........................................................................................................................38
4.5.5 MODE KEY - OTHER..........................................................................................................................................39
5. CALIBRATION...............................................................................................................................................................47
5.1 SENTRY CALIBRATION - AN OVERVIEW.............................................................................................................47
5.1.1 GLOBAL CALIBRATION....................................................................................................................................47
5.1.2 LOCAL CALIBRATION ......................................................................................................................................47
5.2 CALIBRATION INITIALIZATION.............................................................................................................................47
5.2.1 MODULES............................................................................................................................................................47
5.2.2 CALIBRATION PARAMETERS .........................................................................................................................48
5.3 CALIBRATION PROCEDURE....................................................................................................................................48
5.3.1 CONTROLLER SET-UP.......................................................................................................................................48
5.3.2 CALIBRATION GAS DELIVERY METHODS...................................................................................................51
5.3.3 SENSOR EXPOSURE TO GAS ...........................................................................................................................51
TABLE OF CONTENTS
SMC sierra monitor corporation Sentry Instruction Manual - Version 6
6. MAINTENANCE.............................................................................................................................................................53
6.1 MAINTENANCE REQUIREMENTS...........................................................................................................................53
7. SERVICE..........................................................................................................................................................................55
7.1 OVERVIEW ..................................................................................................................................................................55
7.1.1 GENERAL.............................................................................................................................................................55
7.1.2 INSTALLATION INSPECTION...........................................................................................................................55
7.1.3 DATA COLLECTION...........................................................................................................................................55
7.1.4 INSPECTION AND TROUBLESHOOTING GUIDE..........................................................................................55
7.2 CONTROLLER .............................................................................................................................................................58
7.2.1 MECHANICAL/FUNCTIONAL DESCRIPTION................................................................................................58
7.2.2 ELECTRICAL DESCRIPTION.............................................................................................................................58
7.3 COMMUNICATIONS...................................................................................................................................................63
7.3.1 DESCRIPTION OF COMMUNICATIONS..........................................................................................................63
7.3.2 WARNING AND ERROR MESSAGES...............................................................................................................64
7.3.3 WARM-UP TIMERS.............................................................................................................................................64
7.3.4 ACCESS CODES...................................................................................................................................................64
7.3.5 DIAGNOSTIC CODES .........................................................................................................................................64
7.3.6 DIAGNOSTIC REPORT.......................................................................................................................................65
7.4 HYDROGEN SULFIDE MODULE (5100-01).............................................................................................................66
7.4.1 DESCRIPTION......................................................................................................................................................66
7.4.2 TROUBLE ANALYSIS.........................................................................................................................................66
7.4.3 ADJUSTMENT PROCEDURE.............................................................................................................................66
7.4.4 SENSOR REPLACEMENT...................................................................................................................................67
7.5 COMBUSTIBLE GAS SENSOR MODULE (5100-02)................................................................................................69
7.5.1 DESCRIPTION......................................................................................................................................................69
7.5.2 TROUBLE ANALYSIS.........................................................................................................................................69
7.5.3 ADJUSTMENT PROCEDURE.............................................................................................................................69
7.5.4 SENSOR REPLACEMENT...................................................................................................................................70
7.5.5 COMBUSTIBLE GAS SCALING FACTORS......................................................................................................71
7.6 OXYGEN MODULE (5100-03)....................................................................................................................................72
7.6.1 DESCRIPTION......................................................................................................................................................72
7.6.2 TROUBLE ANALYSIS.........................................................................................................................................72
7.6.3 ADJUSTMENT PROCEDURE.............................................................................................................................72
7.6.4 SENSOR REPLACEMENT...................................................................................................................................72
7.7 CARBON MONOXIDE MODULE (5100-04)..............................................................................................................74
7.7.1 DESCRIPTION......................................................................................................................................................74
7.7.2 TROUBLE ANALYSIS.........................................................................................................................................74
7.7.3 ADJUSTMENT PROCEDURE.............................................................................................................................74
7.8 HYDROGEN SULFIDE MODULE (5100-05).............................................................................................................76
7.8.1 DESCRIPTION......................................................................................................................................................76
7.8.2 TROUBLE ANALYSIS.........................................................................................................................................76
7.8.3 ADJUSTMENT PROCEDURE.............................................................................................................................76
7.9 TOXIC GAS SENSOR MODULE ................................................................................................................................78
7.9.1 DESCRIPTION......................................................................................................................................................78
7.9.2 TROUBLE ANALYSIS.........................................................................................................................................78
7.9.3 ADJUSTMENT PROCEDURE.............................................................................................................................78
7.10 AMMONIA SENSOR MODULE (5100-25).................................................................................................................81
7.10.1 DESCRIPTION......................................................................................................................................................81
7.10.2 TROUBLE ANALYSIS.........................................................................................................................................81
7.10.3 ADJUSTMENT PROCEDURE.............................................................................................................................81
TABLE OF CONTENTS
SMC sierra monitor corporation Sentry Instruction Manual - Version 6
8. APPENDICES..................................................................................................................................................................83
8.1 APPENDIX A - SPECIFICATIONS.............................................................................................................................85
8.2 APPENDIX B - LIMITED WARRANTY ....................................................................................................................89
8.3 APPENDIX C - ACCESS CONTROL BY USER CODE.............................................................................................91
8.3.1 INTRODUCTION.................................................................................................................................................91
8.3.2 DEFINITIONS.......................................................................................................................................................91
8.3.3 USER CODE INSTALLATION............................................................................................................................91
8.3.4 USER CODE REMOVAL.....................................................................................................................................91
8.3.5 DIAGNOSTIC CODES:........................................................................................................................................91
8.3.6 LOST ENTRY CODE ...........................................................................................................................................92
8.4 APPENDIX D: - MODEL NUMBERS & PARTS LIST ..............................................................................................93
8.4.1 CONTROLLER ITEMS........................................................................................................................................93
8.4.2 SENSOR MODULE ITEMS.................................................................................................................................94
8.4.3 CALIBRATION EQUIPMENT ............................................................................................................................95
8.5 APPENDIX E - INSTRUCTIONS FOR PRINTER SOFTWARE OPTION...............................................................97
8.5.1 IDENTIFICATION ...............................................................................................................................................97
8.5.2 CAPABILITY........................................................................................................................................................97
8.5.3 REPORTS..............................................................................................................................................................97
8.6 APPENDIX F - MODEL 5392 INDIVIDUAL RELAY ..............................................................................................99
8.6.1 RELAY PANEL DESCRIPTION..........................................................................................................................99
8.6.2 RELAY PANEL ASSEMBLY ..............................................................................................................................99
8.6.3 INSTALLATION ..................................................................................................................................................99
8.6.4 OPERATION.........................................................................................................................................................99
8.6.5 INDIVIDUAL RELAY SPECIFICATIONS.........................................................................................................99
8.7 APPENDIX G - MODEL 4314 OUTPUT EXPANSION PANEL ............................................................................103
8.7.1 EXPANSION PANEL DESCRIPTION ..............................................................................................................103
8.7.2 EXPANSION PANEL ASSEMBLY...................................................................................................................103
8.7.3 INSTALLATION ................................................................................................................................................103
8.7.4 OPERATION.......................................................................................................................................................103
8.7.5 OUTPUT EXPANSION PANEL TESTING.......................................................................................................104
8.7.6 INDIVIDUAL RELAY SPECIFICATIONS.......................................................................................................104
8.8 APPENDIX H - MODEL 5100-99 ANALOG INPUT MODULE.............................................................................106
8.8.1 DESCRIPTION ...................................................................................................................................................106
8.8.2 INSTALLATION ................................................................................................................................................106
8.8.3 ADJUSTMENT PROCEDURE...........................................................................................................................106
8.9 APPENDIX I - MODEL 5100-90 8-CHANNEL ANALOG-DIGITAL CONVERTER............................................107
8.9.1 DESCRIPTION ...................................................................................................................................................107
8.9.2 INSTALLATION ................................................................................................................................................107
8.9.3 SERVICE.............................................................................................................................................................107
8.10 APPENDIX J - REFERENCE DRAWINGS...............................................................................................................109
9. INDEX ............................................................................................................................................................................119
10. LIST OF FIGURES...................................................................................................................................................121
11. LIST OF TABLES.....................................................................................................................................................122
TABLE OF CONTENTS
SMC sierra monitor corporation Sentry Instruction Manual - Version 6
1. PRODUCT DESCRIPTION
1.1 GENERAL
The Sentry 5000 is a fixed installation gas monitoring
system designed for continuous operation in open or
confined areas. The system is comprised of a controller
and up to eight sensor modules. The sensor modules are
supplied for detection of combustible gas, oxygen
deficiency or various toxic gases and can be mixed within
one system as required.
1.2 CONTROLLER
The Sentry controller is a microprocessor computer which
performs functions including management of the sensor
modules, management of alarm relays and interface with
the user via the front panel which includes a concentration
display, an alphanumeric display, keypad and status
indicators. The microprocessor functions are permanently
installed in the controller. They cannot be changed or
damaged by the user and will not be altered by loss of
power.
Configuration variables, such as alarm levels, can be
changed via a simple keypad sequence. Information
provided to the controller in this manner is retained even
when the power is interrupted. This information can be
protected by a "user code" to avoid unauthorized
modification.
Sentry continually scans all modules for alarm conditions.
No sequence of key presses can prevent the scanning
except specific actions during calibration or deliberate
disabling of the sensor module.
The Sentry controller is provided in a rack or panel mount
version for control rooms, an environmental enclosure for
outdoor, stand alone applications, or other packages for
specialty applications.
1.2.1 ENHANCEMENT PACKAGE
Various factory installed firmware enhancements are
available for the Sentry controller. These are selected at
the time of purchase or subsequent upgrade. The
enhancements, which are described in detail in the
appropriate sections of this manual, include:
− Addition of printer output firmware for models
5000-04 or 5000-02. Printer output is standard
on model 5000-08.
− Replace printer output firmware with MODBUS
data address protocol for host computer or DCS
interface. MODBUS is an industry standard
communication protocol which allows bidirectional communication via the controller RS232C serial port.
− High Alarm Acknowledge function for alarm
reset.
− Low Alarm Acknowledge function for alarm
reset
− Emergency Alarm function adds a third alarm
level.
− Zone and Voting assignment of individual alarm
relays.
− Analog Output software driver for use with
Model 4314-01 output module.
− Custom default Gas Tags and Engineering Units
Tags for up to eight input devices.
− Custom default Module Tags for up to eight
module addresses.
− Configure alarm relays to be normally energized
in the safe condition.
1.3 SENSOR MODULES
Each sensor module ("module") is labeled internally to
identify the type of gas it is designed to detect. For each
gas group, the sensor and the electronics board in the
explosion proof housing is different. During installation,
switches in the electronics are set by the user to give the
module an address (module number) to make it unique
from others in the same system. Sentry then
"communicates" with each module to determine its
number, the type of gas it detects, the gas concentration
and other information.
Inside the module housing is an electronic assembly
consisting of two printed circuit board assemblies mounted
under a metal top plate. The address switches and
adjustment potentiometers are accessible through the plate
and electrical test points (test lead jacks) are installed in
the plate. Connectors for wiring from the controller and
the sensor are located on the bottom of the electronic
assembly. The sensor is installed in one hub of the
enclosure.
PRODUCT DESCRIPTION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
1.4 INTERCONNECT WIRING
Not supplied with Sentry, but necessary to the installation
and operation is the three conductor wiring which connects
the controller to the modules. Before this wiring is
installed it is important to read and understand the
installation instructions (Chapter 3) because significant
economies can be realized by connecting more than one
module onto a common wiring run. This standard feature
is accomplished by multiplexing the signals from the
modules to the controller.
1.5 DATA TRANSMISSION
Transparent to the user is the data transfer which occurs on
the installed interconnect wiring. Two of the conductors
are used to pass direct current (DC) from the controller to
the modules. The third wire transfers a series of very rapid
pulses between the controller and the sensor modules. This
digital transfer of information is an important feature of the
system which significantly reduces RFI and EMI problems.
1.6 POWER REQUIREMENTS
The standard system requires 120 VAC, 60 Hz, at 0.5 Amp
electrical supply. A factory option can be ordered for
220 VAC operation. DC voltage (12 to 28 VDC) can be
used for standby power. The system will automatically
switch to supplied DC operation at any time the AC
voltage is interrupted.
The system includes a lithium battery for RAM memory
retention during power interruptions. To ensure
continuous trouble free operation, however, the primary
power source must be one which is continuous and reliable,
preferably dedicated to this equipment. Battery back-up or
emergency power is recommended to insure continuous
operation.
PRODUCT DESCRIPTION
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Figure 1-1
Front Panel Display
PRODUCT DESCRIPTION
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Figure 1-2
Rack Mount Configuration - Outline
PRODUCT DESCRIPTION
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Figure 1-3
NEMA-4 Configuration - Outline
PRODUCT DESCRIPTION
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Figure 1-4
NEMA-7 Configuration - Outline
PRODUCT DESCRIPTION
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Figure 1-5
Panel Mount Configuration Outline
PRODUCT DESCRIPTION
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Figure 1-6
Wall Mount Configuration Outline
PRODUCT DESCRIPTION
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Figure 1-7
Hydrogen Sulfide Module - Outline
PRODUCT DESCRIPTION
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Figure 1-8
Combustible Sensor - Outline
PRODUCT DESCRIPTION
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Figure 1-9
Oxygen and Toxic Sensor Modules - Outline
PRODUCT DESCRIPTION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
Figure 1-10
Model 5100-05 Hydrogen Sulfide Sensor Module (FMRC Approved) - Outline
PRODUCT DESCRIPTION
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Figure 1-11
Model 5100-25 Ammonia Sensor Module - Outline
PRODUCT DESCRIPTION
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2. CAUTIONS & WARNINGS
2.1 INTRODUCTION
Although the Sentry system is designed and constructed
for installation and operation in industrial applications
including "hostile" environments, caution should be taken
to insure that the installation is made in compliance with
this instruction manual and that certain procedures and
conditions are avoided. This chapter discusses the
necessary cautions. Read the entire chapter prior to
installation of the equipment.
2.2 CONTROLLER
The controller should be installed in a location which is
safely accessible during a gas alarm.
Avoid installing the controller where it will be
unnecessarily exposed to wind, dust, shock or vibration or
direct sun. Observe temperature range limitations.
Adhere to standard electrical installation procedures. The
chassis ground on the controller must be connected to
earth ground.
2.3 WIRING
While the digital communication method used between
the controller and modules will greatly reduce problems
associated with electromagnetic and radio frequency
interference the manufacturer recommends that extra
caution be taken where the installation is near any sources
of these interferences:
• Avoid running sensor module cable close to high
power cables, radio transmission lines, or cables
subject to pulses of high current.
• Avoid running cables near large electric motors or
generators.
• When the risk of interference is present use shielded
cables. In conduit installations the shield should be
connected to the conduit. In cable applications the
shield should be connected to the cable connector.
• All splices must be via either a lug and terminal
system or soldered. Improperly spliced cable can
result in corrosion, resistance changes and system
errors.
NOTE
Installation and wiring must be in accordance with the
National Electrical Code
2.4 SENSOR MODULES - GENERAL
Avoid installing sensor modules where they will be
unnecessarily exposed to wind, dust, water (esp. direct
hose down), shock, or vibration. Observe temperature
range limitations.
Sensors may be adversely affected by prolonged exposure
to certain materials. Loss of sensitivity, or corrosion, may
be gradual if such materials are present in low
concentrations. These materials include: Halides
(compounds containing chlorine, fluorine, bromine,
iodine), silicones, acid vapors, caustic liquids or mists.
Care has been taken by the manufacturer to ship your
modules in protective packaging to avoid contamination
prior to installation. It is recommended that the sensors
remain protected during installation and that the covering
be removed immediately prior to system start-up.
During normal use the sensor is protected from dirt and
oil contamination by a sintered metal cover. If this cover
becomes clogged, the response of the sensor will be
reduced. Protect the sensor from contamination by careful
placement, or by use of rain and dust shields.
Sensor modules must not be painted. Paint may contain
compounds which will contaminate the sensor. Paint will
cause clogging of the sintered metal cover and will cause
difficulties during attachment of the calibration head or
other maintenance activity. It is recommended that the
module be tagged "DO NOT PAINT".
When sensors are replaced the thread must be Teflon
taped to avoid metal to metal binding which will damage
the housing threads.
2.4.1 COMBUSTIBLE SENSOR MODULES
Catalytic type combustible gas sensors may be poisoned
by exposure to silicones. Sierra Monitor Corporation
supplies resistant sensors, but care should be taken to
avoid exposure to silicones. No Silicone caulking (RTV)
should be used near the sensors. No other silicone based
compounds should be used near the sensors unless they
are fully protected during the entire cure cycle. If the
sensors will be exposed to silicone during normal
operation the manufacturer's sensor warranty is void.
CAUTIONS & WARNINGS
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3. INSTALLATION
All systems are factory are pre-configured and calibrated.
NOTE
All sensors are tagged to indicate the controller (alpha)
and the sensor module number (1 - 8).
Identify all components of the system during unpacking
and install using the factory configuration.
The system will power up in a calibrated and fully
functional condition.
3.1 CONTROLLER LOCATION
Rack mounted controllers should be installed in a control
room environment where they will be relatively free from
dust and temperature extremes. For ease of operation
select a rack window space at approximately eye level.
Four controllers can be installed side by side in a 19"
instrument shelf.
Enclosed controllers for outdoor applications should be
located in the most protected location available with
consideration for easy access for installation and
calibration. The enclosures should be mounted on a
vertical surface with the key board at approximately eye
level. The enclosure should not face directly into the sun.
3.2 SENSOR MODULE LOCATIONS
Select locations for each of the sensor modules based on
the following:
• Consider the density, relative to dry air, of the gas to
determine height of module above floor or ground
level:
Gas Density
(Air = 1.00)
Air 1.00
Ammonia 0.60
Carbon Monoxide 0.97
Chlorine 2.49
Ethylene Oxide 1.52
Hydrogen 0.07
Hydrogen Chloride 1.27
Hydrogen Cyanide 0.94
Hydrogen Sulfide 1.19
Methane 0.55
Nitrogen Dioxide 1.58
Oxygen (Air) 1.10
Sulfur Dioxide 2.26
• Modules should be placed close to the potential source
of gas.
• Modules should be placed in areas accessible for
calibration.
• Sensors should be pointed down and the conduit
should include an inverse trap to reduce moisture
(condensation) from accumulating in the electronics
enclosure Figure 3-3.
3.3 WIRING
Plan the wiring arrangement to minimize installation
expense but with redundancy for critical locations. Wire
shall be Belden (or equivalent) 949X (where X = 2, 3, 4, or
5 depending on wire gauge). If high RFI or EMI levels
exist wiring should be protected by conduit or shield.
Shielded wire shall be Belden (or equivalent) 936X.
In no case should the drain wire of shielded cable be used
as one of the conductors.
NOTE
• Any modules which are located in a common
geographical area a long distance from the controller
can be connected to the same three conductor wire run
installed from the controller to that area. Table 3-2,
Figure 3-4.
• The remote auxiliary power supply option can be used
for installation of one or more modules a long distance
from the controller location. The connection from the
controller to the remote power supply is via a two
conductor "data link" Figure 3-4.
Number of Maximum length of wire run (feet)
modules 500 1,000 2,000 3,000 5,000
1
2
3
4
20 20 18 16 14
20 18 14 12 xx
18 16 12 xx xx
16 14 12 xx xx
Table 3-2
Minimum Wire Gauges
Table 3-1
Specific Gravity of Selected Gases
INSTALLATION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
Install conduit as required. Provide for splice boxes where
multiple modules will be wired to a single run. Pull 3
(typical: white, black, green) conductors of the correct
gauge wire from the controller to each splice box and from
the respective splice box to each planned module location.
See Figure 3-5 for proper wire termination in the splice
box. Twisted wire secured with wire nuts is not an
acceptable splice.
NOTE
Installation and wiring must be in accordance with the
National Electrical Code
In installations where redundancy of module locations is a
requirement do not install multiple modules on one cabling
run as any damage to the primary wiring will disable all the
modules.
NOTE
Temperature rating of cable wire insulation must be
above 75oC (85oC or greater rating wiring is
recommended). If cable runs through higher temperature
environments, it should be specified for that environment.
3.4 SENSOR MODULE INSTALLATION
Note: Remove spring from the electromechanical
sensor (5100-04 through 5100-23) prior to installation.
See technical note provided with sensor module.
1. Remove the electronics from the module housing
by:
• Unscrew the two captive panel screws in the
top plate.
• Lift the electronics out of the housing.
• Unplug the sensor harness from the bottom
electronics board.
2. Install the module housing onto the end of the
supply conduit and/or bolt into position as
required.
Note
If housing grounding is required for the installation a
grounding lug is located under the two printed circuit
assemblies in the housing. Install the ground wire under
the green lug. Figure 3-5
Controller
Marking
Function Module
Marking
Color
1 +VDC P White
2 Signal S Black
3 DC Return G Green
Table 3-3
Sensor Module Wiring
4. Reconnect the sensor harness to the sensor
connector on the bottom of the electronic
assembly. Figure 3-7.
5. Twist the assembly 180o to take up the service
loop on both the incoming wire and the sensor
harness. With the sensor facing down the wording
on the cover plate will be correctly oriented.
6. Carefully fit the electronics over the two posts in
the housing and tighten the captive panel screws.
Module Switch Positions
# 1 2 3
1 ON ON ON
2 OFF ON ON
3 ON OFF ON
4 OFF OFF ON
5 ON ON OFF
6 OFF ON OFF
7 ON OFF OFF
8 OFF OFF OFF
Table 3-4
Sensor Module Binary Switch Positions
7. Set the dip switch Figure 3-8 on each module to
indicate the module number (Table 3-4). Each of
the modules connected to one controller must have
a different address. (Note: Switch position 4 is not
used.)
3. Connect the three wires which run from the
controller to the three position terminal strip on the
bottom of the electronics assembly. See Table 3-3
for terminal markings and normal wiring color
code conventions. Figure 3-7 shows the correct
wiring connections and the operation of the
connector mechanism.
INSTALLATION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
3.5 CONTROLLER INSTALLATION
3.5.1 CONTROLLER CONFIGURATIONS
Table 3-5 lists the number of sensor modules which can be
operated on each controller model.
Model Controller Capacity
5000-02 2 Sensor Modules
5000-04 4 Sensor Modules
5000-08 8 Sensor Modules
Table 3-5
Sentry Controller Capacity
Table 3-6 lists and describes Sentry controller enclosure
options.
Model Description
5380-00 Standard configuration, controller
intended for installation in instrument
rack. Wiring to back connector panel.
5381-00 Controller supplied with bezel for panel
or chassis installation. Wiring to back
connector panel.
3.5.2.2 CHASSIS MOUNTED CONTROLLER
The chassis mounted controller is provided with a preinstalled bezel and a template for the chassis cut-out. An
angle bracket is also provided to support the cantilever of
the controller. Select an appropriate location at
approximately eye level providing rear access for the
module and alarm wiring.
3.5.2.3 WALL MOUNTED CONTROLLER
The wall mounted controller is provided on a sheet metal
panel containing brackets which allow for removal of the
controller. Select a location, where module and alarm
wiring can be run up or down the wall for distribution, and
bolt the panel to the wall.
3.5.2.4 NEMA ENCLOSED CONTROLLER
Mount the NEMA enclosed controller on a vertical surface
with the display at approximately eye level. Mounting feet
are supplied with the enclosure for external mounting bolts.
Figure 1-3. Although the enclosure is designed for
exposure to weather, normal measures to protect the
system from harsh conditions are recommended. It is
particularly important to avoid exposure of the display to
direct sunlight as this can cause fading of the display
during very hot weather.
5382-00 Wall mount configuration includes a
mounting panel and brackets, display is
side mounted. Wiring to side facing
panel.
5383-00 NEMA-4X Enclosure with latching front
door and window for viewing display.
Wiring to front facing terminal strips.
5395-00 NEMA-7 Explosion Proof Enclosure
with screw in window for viewing of
display and external switches for
operation of keypad. Wiring to side
facing panel.
Table 3-6
Sentry Enclosure Options
3.5.2 CONTROLLER MOUNTING
3.5.2.1 RACK MOUNTED CONTROLLER
The instrument rack should be installed in a 19" electronic
cabinet at eye level. Care should be taken to avoid heat
from other instruments under the controller.
3.5.2.5 WIRING CONNECTIONS
Channel wiring connections at the controller (except
NEMA-4X) and at the module are made using a quick
connect terminal strip. Figure 3-7. The terminal can be
operated using an actuator (supplied in the system
accessory bag) or by pressing a small screwdriver into the
actuator slot.
It is important to understand that, because of multiplexed
communication, there is a difference between "channel"
numbers and "module" numbers. Channels are the physical
connectors at the controller. Module numbers are the
switched addresses on each module. More than one
module number may be installed on a channel, up to a
maximum of four modules.
NOTE
Installation and wiring must be in accordance with the
National Electrical Code
Make the following connections at the controller.:
• Attach the three wires for each channel to separate
channel connectors on the terminal strip marked CH1
through CH8. The sequence should exactly match that
at the sensor assembly. (Typical: White 1, Black 2,
Green 3.)
INSTALLATION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
• Connect the necessary remote audible and visual
alarms or other process control equipment to the
"HIGH", "LOW" and "TROUBLE" dry contact relays on
the connector panel.
The Double Pole/Double Throw (DPDT) relay
connections are marked to indicate Normally Open
(N/O) , Normally Closed (N/C) and Common (COM)
terminals for each pole. No voltage is applied to the
terminals internally.
Typical wiring configuration is described in Figure
3-11. The trouble relay is fail safe so that it will
switch from Normally Closed to Normally Open if all
system power is lost.
NOTE
It may be preferably to delay wiring the alarms, or delay
powering them, until the detection system has been fully
activated, tested and calibrated.
Connect 120 volts AC wiring to the terminals marked Hot
(black), Neutral (white), and Ground (Green).
If a 12-28 VDC supply is to be used as either back-up or as
the primary operating voltage make the necessary
connections to the terminal marked "DC INPUT 12 - 28V"
"+" (Red) & "-" (Black).
NOTE
When a battery is to be used for back-up DC supply only,
a Sentry feature provides protection against battery
damage by shutting off the battery before complete
discharge. When this feature is used, the Sentry
controller can only be restarted by AC voltage.
To implement the battery protection feature, two red
jumper wires located on the power supply board must be
cut. See Figure 7-3.
If splice boxes are used to combine multiple modules on a
channel the splice connections should be made using a
terminal block/wire lug assembly or all wires should be
soldered and insulated. Figure 3-5.
3.5.3 ALARM DEVICE INSTALLATION
Alarm devices must be installed according to the
manufacturer's instructions for the particular device.
Sentry dry contact relays provide switching capability as
rated in the specifications. (See Appendix A.)
NOTE
Certain warning strobes have a very high peak current
which is dependent upon the phase angle of the AC line at
the precise moment the strobe is switched on. A high
current at the time of switching may cause the relay
contacts to stick together.
The corrective action to avoid contacts sticking together is
to install a 10 Ohm, 5 Watt resistor in series with the
strobe power, preferably close to the relay.
3.5.4 RELAY OUTPUTS
Three relays on the standard Sentry controller are for: high
alarm, low alarm and trouble. The trouble relay is
normally energized (power applied to coil). The gas alarm
relays (high and low) are normally not energized.
Individual low and high alarm relays are optional
hardware.
NO
RELAY
COM.
110 VAC
NO
RELAY
COM.
+ -
MOV
1N4005
DC
Install MOV
close to switch
Install diode
close to load
Figure 3-1
Typical Protection Circuit
The relays are dry contact and may be used to actuate bells,
lights, sirens, solenoid valves, or contactors as required. It
is recommended that for 120 VAC circuits a metal oxide
varistor (MOV) rated for 150 Vrms be place across the
load (Figure 3-1). (General Electric V150LA20A or
equivalent). For DC circuits a general purpose rectifier
diode should be placed across the load (1N4005).
3.5.5 DC POWER LOAD
Table 3-7 is provided to allow correct sizing of battery
back-up. To determine total load add the applicable
individual loads. (All measurements are at 12 VDC.)
Test Condition Amps Watts
Controller, No Sensors, No Alarms 0.560 6.7
Controller, No Sensors, All Alarms 0.660 8.0
Controller, 8 Combust, All Alarms 4.000 48.0
Individual Relay Board 0.750 9.3
Hydrogen Sulfide (Type 1) Module 0.260 3.1
Combustible (Type 2) Module 0.420 5.0
Electrochemical Sensor (typical) 0.050 0.6
Table 3-7
Sentry Power Load
INSTALLATION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
3.5.6 POWER UP
Systems shipped complete from the factory are preconfigured and calibrated. When power is turned on the
power light will start flashing and the alpha-numeric
display will indicate "SYSTEM WARM-UP" "PLEASE WAIT
MM:SS" (where MM:SS is a five minute count-down
clock). When the warm-up ends the two displays will
begin functioning in the "continuous scan" mode which is
described in the next chapter. The large display will cycle
through each module number for any modules which have
been installed.
If modules have been added to the system since it was
factory configured, those modules will have a blank (“—“)
concentration display and the lower display will show the
module type and units with "FACTOR MISSING" or
"UNCALIBRATED" messages.
If the display indicates module numbers which match the
numbers used in installation, the wiring is correct and
module configuration can begin. If any number is omitted
the controller is not recognizing that module and the wiring
should be checked for errors (the system will display "NO
MODULE" when any attempt is made to obtain information
on that module).
If the controller does not recognize any modules the
display will read "NO MODULES INSTALLED".
NOTE
On 2 and 4 Channel systems any module set with a
number higher than four will cause the lower display to
indicate "MODULE # MUST BE 1 THROUGH 4" and
the upper display to display "#E --" (where # = the
erroneous module number).
3.5.7 POWER DOWN
If it is necessary to remove the power all operator
configured data and parameters will be saved by Sentry. (It
is important to turn off the main power prior to
disconnection of any module wiring because while under
power Sentry will interpret certain changes as errors.)
INSTALLATION
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
Figure 3-2
Controller Mounting Options
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
Figure 3-3
Sensor Module Mounting
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SMC sierra monitor corporation Sentry Instruction Manual - Version 6
Figure 3-4
Wiring Options
Page: 24
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