Det-Tronics R8471H User manual

Instructions 95-8475
Combustible Gas Controller
R8471H
1.1 5/07 95-8475

SECTION I - INSTALLATION AND STARTUP
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Sensor Location . . . . . . . . . . . . . . . . . . . . . . . . 1
General Wiring Requirements . . . . . . . . . . . . . . 2
Controller Wiring . . . . . . . . . . . . . . . . . . . . . . . . 2
Typical Application . . . . . . . . . . . . . . . . . . . . . . 5
Controller Programming . . . . . . . . . . . . . . . . . . 5
INSTALLATION CHECKLIST . . . . . . . . . . . . . . . . . 7
STARTUP PROCEDURE . . . . . . . . . . . . . . . . . . . . 8
SETPOINT ADJUSTMENT . . . . . . . . . . . . . . . . . . . 8
Setpoint Display Mode . . . . . . . . . . . . . . . . . . . 8
Setpoint Adjustment Procedure . . . . . . . . . . . . . 9
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Calibration Procedure . . . . . . . . . . . . . . . . . . . . 9
Calibrating PointWatch . . . . . . . . . . . . . . . . . . 10
Calibrating the Controller . . . . . . . . . . . . . . . . . 11
Current Output Calibration . . . . . . . . . . . . . . . 11
SECTION II - DESCRIPTION AND OPERATING
CHARACTERISTICS
FACEPLATE DESCRIPTION . . . . . . . . . . . . . . . . . 12
OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
AUTOMATIC DIAGNOSTICS AND FAULT
IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . 13
OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . 13
Normal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Other Operating Modes . . . . . . . . . . . . . . . . . . 15
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION III - SYSTEM MAINTENANCE
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 15
ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . 17
Manual Check of Output Devices . . . . . . . . . . 17
Checkout in Normal Mode . . . . . . . . . . . . . . . . 17
PointWatch Maintenance . . . . . . . . . . . . . . . . 17
DEVICE REPAIR AND RETURN . . . . . . . . . . . . . 17
ORDERING INFORMATION . . . . . . . . . . . . . . . . . 18
Mounting Racks . . . . . . . . . . . . . . . . . . . . . . . . 19
Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Calibration Kits . . . . . . . . . . . . . . . . . . . . . . . . 19
APPENDIX A - FACTORY MUTUAL RESEARCH
CORPORATION (FMRC) APPROVAL DESCRIPTION
APPENDIX B - CANADIAN STANDARDS
ASSOCIATION (CSA) APPROVAL DESCRIPTION
List of Illustrations
Figure 1 Dimensions of Q4004 Mounting Rack . 3
Figure 2 Clip Positioning for Q4004 Mounting
Racks . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 3 Terminal Configuration for R8471H
Combustible Gas Controller . . . . . . . . . 4
Figure 4 A Typical System with Relay Outputs and
Non-Isolated Current Output . . . . . . . . 4
Figure 5 A Typical System with Relay Outputs and
Isolated Current Output . . . . . . . . . . . . 5
Figure 6 Open Collector Output with Inductive
Load and Transient Suppression
Device . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 7 R8471H Controller Wired to a
PointWatch Detector . . . . . . . . . . . . . . 6
Figure 8 Programming Jumper Plugs and
Switches . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9 Controller Front Panel . . . . . . . . . . . . 12
Figure 10 R8471H Controller Flow Chart . . . . . . 14
Figure 11 Controller Dimensions in Inches
(Centimeters) . . . . . . . . . . . . . . . . . . . 15
Fault Record Sheet . . . . . . . . . . . . . . 22
Recommended Test Form . . . . . . . . . 23
List of Tables
Table 1 Selectable Relay Options . . . . . . . . . . . 6
Table 2 System Status Codes . . . . . . . . . . . . . 10
Table 3 Troubleshooting Guide . . . . . . . . . . . . 16
Table of Contents

IMPORTANT
Be sure to read and understand the entire
instruction manual before installing, operating or
servicing the gas detection equipment.
WARNING
Do not open the PointWatch junction box with
power applied unless it is verified that no
combustible gases or vapors are present. A
portable gas detection instrument should be
used to ensure that the area is clear of any
combustible gases. Calibration or maintenance
should not be performed if there is any indication
of the presence of combustible gas at the
sensor.
CAUTION
The wiring instructions in this manual will provide
safe and proper functioning of the device under
normal conditions. However, local variations in
wiring codes and regulations exist, and total
compliance with these ordinances cannot be
guaranteed. Be certain that all wiring complies
with the IEC/NEC as well as all local ordinances.
If in doubt, consult the local authority having
jurisdiction before wiring the system.
Section I
Installation and Startup
INSTALLATION
SENSOR LOCATION
Proper sensor positioning is essential to ensure
maximum gas detection capability. Optimum sensor
placement and density varies depending upon the
conditions at the job site. The system designer and
installer must examine the specific area to be
protected and identify the most likely leak sources
and gas accumulation areas to determine the best
sensor locations.
The following factors should be considered for every
installation:
1. What kind of gas is to be detected? If it is lighter
than air (Acetylene, Hydrogen, Methane, etc.),
place the sensor above the potential gas leak.
Place it close to the floor for gases that are
heavier than air (Benzene, Butane, Butylene,
Propane, Hexane, Pentane, etc.) or for vapors
resulting from flammable liquid spills. Careful
analysis of both the vapor hazard and the
application is required — first to determine the
feasibility of detection and then to ensure that
proper sensor locations are selected.
2. How rapidly will the gas diffuse into the air?
Locate the sensor as close as practical to the
anticipated source of a gas leak.
3. Ventilation characteristics of the immediate area
must also be considered. Air movement can
cause the gas to accumulate more heavily in one
area than another. Smoke generator tests are
useful in identifying typical air current patterns as
well as “dead” air spots for both indoor and
outdoor applications. The sensors should be
placed where the most concentrated
accumulation of gas is anticipated.
INSTRUCTIONS
Combustible Gas Controller
R8471H
1.1 ©Detector Electronics Corporation 2007 5/07 95-8475

95-84751.1 2
4. The sensor should be located in an area where it
is safe from potential sources of contamination.
5. The sensor should be pointed down to prevent
the buildup of contaminants on the gas inlet.
6. The sensor must be accessible for testing and
calibration.
7. Exposure to excessive heat or vibration can result
in pre-mature failure of electronic devices and
should be avoided if possible. Shield the sensor
from intense sunlight to reduce solar heating.
IMPORTANT
All diffusion-based gas sensors must contact the
target gas in order to provide an accurate gas
measurement. This must always be remembered
when selecting locations for gas sensor
installation.
For additional information on determining quantity and
placement for sensors in a specific application, refer
to Instrument Society of America (ISA) Transaction
Volume 20, Number 2, titled “The Use of Combustible
Detectors in Protecting Facilities from Flammable
Hazards.”
GENERAL WIRING REQUIREMENTS
Wire Size and Type
In applications where the wiring cable is installed in
conduit, the conduit must not be used for wiring to
other electrical equipment.
Three wire shielded cable is highly recommended for
connecting the PointWatch to the controller. A foil
shield is recommended.
The maximum wiring distance between the
PointWatch and controller is limited by the gauge of
the wire being used. Refer to the PointWatch
manual for specific information on maximum loop
resistance.
CONDUIT SEALS, DRAINS, AND BREATHERS
When installing the PointWatch in hazardous areas
where explosion-proof equipment certification is
required, explosion-proof conduit seals should be
installed within 18 inches (46 cm) of the junction box
to prevent the passage of vapors or flames through
the conduit. Seals are recommended even if they are
not required by local wiring codes.
Conduit systems are never completely air-tight. As a
result, significant amounts of condensation can form
within the conduit system. Therefore, it is important to
take proper precautions during installation to ensure
that accumulated moisture will not cause damage to
the components of the system.
Conduit raceways should be inclined so that water
will flow to low points for drainage and will not collect
on conduit seals or inside enclosures. 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.
Conduit drains should 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.
When using steel wire armored or mineral-insulated
copper-sheathed cable, select an approved gland
with a watertight compression stage and an overall
gland shroud for outdoor applications. A sealing
washer must be fitted between the gland and the
conduit/cable entry to ensure IP66 rating.
CONTROLLER WIRING
Field Wiring Connector
The controller is furnished with a field wiring
connector backplate that incorporates pressure type
screw terminals for connecting the external wiring and
a circuit board edge connector for attaching to the
controller. The use of a mounting rack is
recommended for mounting the controller. The
backplate is attached to the back of the rack to allow
easy removal of the controller without disturbing the
wiring. See Figures 1 and 2.
The controller is designed for installation in a non-
hazardous area.
Figure 3 shows the terminal configuration for the
R8471H Controller.
Terminals 1 and 2 – 4 to 20 ma dc output.
Non-Isolated Current Output -
If the 4 to 20 ma current loop is
to be non-isolated, wire the
system as shown in Figure 4.
Note that terminal 2 is not used
with a non-isolated current loop.
Program the unit for a non-
isolated current loop as
described in the “Controller

395-84751.1
(A)
(B)
(C)
1.48 (37.59)
(D)
B1475
ALL CONTROLLER CAGES REQUIRE
A MINIMUM OF 10.12 INCHES (257.1 MM)
DEPTH CLEARANCE
(E)
1
A1476
FIRE CONTROLLERS ARE APPROX. TWO INCHES
WIDE AND REQUIRE TWO GUIDE RAILS FOR
INSERTION. PLACE THE RETAINING CLIP BETWEEN
RAILS TO FORM SETS, LEAVE A GAP BETWEEN SETS.
SET SETGAP
123 2
THE Q4004 CONTROLLER CAGE HAS BEEN MODIFIED
TO ACCOMMODATE EITHER FIRE OR GAS CONTROLLERS
OR ANY COMBINATION OF THE TWO.
BY FOLLOWING THE INSTRUCTIONS BELOW, THE CAGE
CAN BE SET UP TO ANY CONFIGURATION.
2TO INSERT A BLANK PANEL, PLACE A CLIP IN
THE TOP BRACKET IN LINE WITH THE CLIP IN THE
BOTTOM BRACKET.
3
GAS CONTROLLERS ARE APPROX. ONE INCH WIDE
AND REQUIRE ONE RAIL FOR INSERTION. PLACE CLIPS
IN LINE WITH GUIDE RAILS, CAGES WILL ACCEPT AS
MANY GAS CONTROLLERS AS RAILS PROVIDED.
Figure 1—Dimensions of the Q4004 Mounting Rack
Figure 2—Clip Positioning for Q4004 Mounting Racks
CONTROLLER
POSITIONS FOR HT: DIM. (A) DIM. (B) DIM. (C) DIM. (D) DIM. (E) WEIGHT
FLAME GAS INCH MM INCH MM INCH MM INCH MM INCH MM LB KG
8 16 4U 19.00 482.6 18.30 464.8 17.36 440.9 4.00 101.6 6.97 177.1 9.3 4.2
6 12 4U 15.06 382.6 14.36 364.7 13.42 340.9 7.6 3.5
4 8 4U 11.13 282.6 10.43 264.9 9.49 241.1 5.9 2.7
3 6 4U 9.16 232.7 8.46 214.9 7.52 191.0 5.1 2.3
2 4 4U 7.19 182.7 6.49 164.9 5.55 141.0 4.2 1.9
1 2 4U 5.22 132.6 4.52 114.8 3.58 90.9 3.1 1.4
16 3U 19.00 482.6 18.30 464.8 17.36 440.9 2.25 57.15 5.22 132.6 9.3 4.2
12 3U 15.06 382.6 14.36 364.7 13.42 340.9 7.6 3.5
8 3U 11.13 282.6 10.43 264.9 9.49 241.1 5.9 2.7
6 3U 9.16 232.7 8.46 214.9 7.52 191.0 5.1 2.3
4 3U 7.19 182.7 6.49 164.9 5.55 141.0 4.2 1.9
2 3U 5.22 132.6 4.52 114.8 3.58 90.9 3.1 1.4

Programming” section of this
manual.
Isolated Current Output - If an
isolated current loop is desired,
wire the system as shown in
Figure 5 and program the unit for
an isolated current loop as
described in the “Controller
Programming” section of this
manual. Note that this wiring
scheme requires an external
power source for the isolated
current output.
Terminal 3 – Chassis ground. Connect the
cable shield to this terminal.
NOTE
If local wiring codes permit and if a ground fault
monitoring system is not being used, the minus
side of the dc power source can be connected to
chassis (earth) ground. Alternatively, a 0.47
microfarad, 100 volt capacitor can be installed
(terminal 5 to ground) for best immunity against
electromagnetic interference.
Terminal 4 – Connect to the positive (+) side
of the 18 to 32 vdc power
source.
Terminal 5 – Connect to the negative (-) side
of the dc power source.
Terminal 6 – Make no connections to this
terminal.
Terminal 7 – 4 to 20 ma dc signal input from
PointWatch.
95-84751.1 4
ISOLATED OUTPUT
CURRENT LOOP
CHASSISGROUND
POWER
SENSOR
EXTERNAL RESET
HIGH ALARM
HIGH ALARM / OC
AUX. ALARM
AUX. ALARM / OC
LOW ALARM
LOW ALARM / OC
FAULT
FAULT / OC
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–
+
+
–
+
–
18TO 32VDC
GROUND
POWER
SIGNAL
HIGH
ALARM
AUXILIARY
ALARM
LOW
ALARM
FAULT
RESET
24
VDC
+
–
2
4-20 MA
B1954
R8471 CONTROLLER
*
*
*NO CONNECTION
DET-TRONICSJUNCTION BOX
SPARE
CAL
4 - 20
RET
+24
CHASSIS
CAL
4 - 20
RET
+24 POINTWATCH
DETECTOR
GREEN
YELLOW
WHITE
BLACK
RED
Figure 4—A Typical System with Relay Outputs and Non-Isolated Current Output
CURRENT OUTPUT
CHASSIS GROUND
POWER
SENSOR
EXTERNAL RESET
HIGH ALARM
HIGH ALARM / OC
AUX. ALARM
AUX. ALARM / OC
LOW ALARM
LOW ALARM / OC
FAULT
FAULT / OC
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–
+
+
–
+
–
18 TO 32
VDC
POWER
SIGNAL
2
OC = OPEN COLLECTOR OUTPUT
(BASE MODEL ONLY) B1390
Figure 3—Terminal Configuration for R8471H
Combustible Gas Controller

Terminal 8 – A normally open momentary
closure switch can be connected
between this terminal and the
negative (-) side of the power
source for remote reset.
Terminals 9 and 10 – High Alarm Output.
Terminals 11 and 12 – Auxiliary Alarm Output.
Terminals 13 and 14 – Low Alarm Output.
Terminals 15 and 16 – Fault Output.
Premium Controller – The relay outputs (terminals 9
to 16) are programmed for the desired operation
using the procedure described in the “Controller
Programming” section of this manual.
Base Controller – Connections to open collector
transistor outputs are made at terminals 10, 12, 14,
and 16. Terminals 9, 11, 13, and 15 are not used. See
Figure 6 for an example of a typical connection to an
open collector transistor output.
NOTE
External equipment that can generate transients
when switching (such as relays) must have a
transient suppression device (diode) properly
connected across the coil at the time of
installation. This will safeguard the output
transistors of the controller against possible
damage. Figure 6 illustrates an inductive load
with a diode used for transient suppression.
TYPICAL APPLICATION
Refer to Figure 7 for an illustration of an R8471H
Controller wired to a PointWatch IR gas detector.
CONTROLLER PROGRAMMING
Refer to Figure 8 to determine the location of
programming jumpers and switches. Table 1 shows
the selectable options for each relay.
NOTE
All controller jumper plugs must be installed. The
controller outputs will not function properly if a
jumper plug is missing.
595-84751.1
ISOLATED OUTPUT
CURRENT LOOP
CHASSISGROUND
POWER
SENSOR
EXTERNAL RESET
HIGH ALARM
HIGH ALARM / OC
AUX. ALARM
AUX. ALARM / OC
LOW ALARM
LOW ALARM / OC
FAULT
FAULT / OC
1
3
4
5
6
7
8
9
10
11
12
13
14
15
16
–
+
+
–
+
–
18TO 32VDC
GROUND
POWER
SIGNAL
HIGH
ALARM
AUXILIARY
ALARM
LOW
ALARM
FAULT
RESET
+
–
24
VDC
24
VDC
+
–
2
4-20 MA
R8471 CONTROLLER
*
*NO CONNECTION
B1955
DET-TRONICSJUNCTION BOX
SPARE
CAL
4 - 20
RET
+24
CHASSIS
CAL
4 - 20
RET
+24 POINTWATCH
DETECTOR
GREEN
YELLOW
WHITE
BLACK
RED
Figure 5—A Typical System with Relay Outputs and Isolated Current Output
100K
OPEN COLLECTOR OUTPUT
1N4004
TYPICAL
+32 VDC MAXIMUM
C1289
Figure 6—Open Collector Output with Inductive Load
and Transient Suppression Device

Normally Open/Closed Relays
The four relays are individually programmed for either
normally open or normally closed contacts. This is
accomplished by placing a jumper plug on the
appropriate pair of pins. Each relay has a set of three
pins. For normally open operation, place the plug on
the NO and center pins. For normally closed
operation, place it on the NC and center pins. The pin
groups are identified as follows:
J2 – High Alarm
J3 – Auxiliary Alarm
J4 – Low Alarm
J5 – Fault
The controller is programmed at the factory for
normally open relay contacts.
Latching/Non-Latching Relays
The Low and Auxiliary alarm relays are programmable
as a group for latching or non-latching operation. The
High alarm relay is always latching. Latching relay
operation is programmed using rocker switch 1 at
SW1 (SW1-1). For latching operation, place the switch
in the closed position. For non-latching operation,
place it in the open position. This switch is set at the
factory for non-latching relay operation.
95-84751.1 6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
SP.
CAL
SIG
RET
+ 24
CAL
SIG
RET
+ 24
+
–
POINTWATCH
24 VDC
POWER SUPPLY
NOTES:
1. REED SWITCH, LED, AND ALL INTERNAL CONNECTIONSARE PROVIDED ON
THE POINTWATCH JUNCTION BOX BASE CONNECTOR BOARD.
2. CONDUCT POINTWATCH CALIBRATION PROCEDURE BEFORE
R8471 CONTROLLER CALIBRATION.
3. POINTWATCH CALIBRATION INITIATION WILL CAUSE R8471 FAULT
CONDITION UNTIL POINTWATCH CALIBRATION PROCEDURE ISCOMPLETED.
4. CONDUCT R8471 CALIBRATION PROCEDURE AFTER POINTWATCH
CALIBRATION ISCOMPLETED.
5. CABLE SHIELD WIRE ISTO BE CUT BACK AND TAPED OFF WITHIN
POINTWATCH JUNCTION BOX.
6. CABLE SHIELD WIRE ISTO BE CONNECTED TO TERMINAL NO. 3AT R8471
BACKPLATE, WHICH ISTHE CONTROLLER EARTH GROUND CONNECTION.
MAGNETIC REED SWITCH FOR
POINTWATCH CALIBRATION COMMAND
GREEN
YELLOW
WHITE
BLACK
RED
B1956
Figure 7—R8471H Controller Wired to a PointWatch Detector
Relay Selectable Selectable*Selectable*
Normally Normally Latch/
Open/Closed Energized/ Non-Latch
De-Energized
Low Y Y Y
High Y Y N1
Auxiliary Y Y Y
Fault Y N2N3
Y = Yes N = No 1Latching only
2Normally Energized 3No latching option
*Relays selectable as a group.
Table 1—Selectable Relay Options

Normally Energized/De-Energized Relays
The three alarm relays are programmable as a group
for normally energized (fail-safe) or normally de-
energized operation. This is accomplished by setting
rocker switch 2 at SW1 (SW1-2). For normally
energized alarm relays, place the switch in the closed
position. For normally de-energized operation, place it
in the open position. This switch is set at the factory
for normally de-energized operation.
The Fault relay is always normally energized,
regardless of the setting of SW1-2.
4 to 20 ma Output
Isolated or non-isolated operation of the 4 to 20 ma
output is selected using a jumper plug at J1. For non-
isolated operation, as illustrated in Figure 4, place the
jumper plug in the INT (internal power source)
position. Place the plug in the EXT position for an
isolated circuit, as illustrated in Figure 5. The jumper
is set at the factory for non-isolated operation.
INSTALLATION CHECKLIST
The following checklist is provided as a means of
double checking the system to be sure that all phases
of system installation are complete and have been
performed correctly.
1. PointWatch detectors are installed following the
instructions in the PointWatch manual.
2. Junction boxes are securely mounted and covers
are tightly installed.
3. All cable shields are properly grounded.
4. Conduit seals have been installed at all junction
box entries (if conduit is being used).
5. PointWatch to controller wiring is correct.
6. Power wiring to the controller is installed and
power source is operational.
7. External loads are properly connected to the
controller.
8. Controller is programmed as desired. Record this
information for future reference.
9. Controller is properly installed in the mounting
enclosure.
10. Proper ventilation is provided to prevent over-
heating of the controller.
795-84751.1
A1392
SW1-1
CLOSED = LATCHING
OPEN = NON-LATCHING
SW1-2
CLOSED = NORMALLY ENERGIZED
OPEN = NORMALLY DE-ENERGIZED
J1INT = NON-ISOLATED
EXT = ISOLATED
HIGH ALARM
AUXILIARY ALARM
LOW ALARM
FAULT
NORMALLY
OPEN/CLOSED
RELAY
CONTACTS
Figure 8—Programming Jumper Plugs and Switches

Proceed to System Startup, Setpoint Adjustment, and
Calibration.
STARTUP PROCEDURE
1. Output loads that are normally actuated by the
gas detection system should be secured (remove
power from all output devices) to prevent
undesired activation.
2. Check all external wiring for proper connection.
3. Before installing the controller in the mounting
rack, inspect it to verify that it has not been
physically damaged in shipment. Check the
jumper plugs and rocker switches on the
controller for proper programming, then slide the
controller fully into the mounting enclosure.
4. Apply power to the system.
NOTE
The controller has a power-up delay before
beginning normal operation after power is
applied to the system. During this time the
outputs are inhibited, the FAULT LED is
illuminated, and the current output indicates a
fault condition. This delay allows time for the
PointWatch output to stabilize before beginning
normal operation.
5. Put the controller in the Setpoint Display mode to
determine the present alarm setpoints and
calibration gas concentration. If changes are
required, perform the Setpoint Adjustment
procedure.
6. Perform the calibration procedure. This involves
calibrating the PointWatch using the procedure
described in the PointWatch manual, then
calibrating the controller using the procedure
described in the “Calibration” section of this
manual.
7. Check the 4 to 20 ma current loop for proper
calibration and adjust as required.
8. After calibration is completed, restore the system
output loads to ready condition.
SETPOINT ADJUSTMENT
The R8471H Controller has independent Low, High,
and Auxiliary alarm setpoints, with corresponding
outputs.
The programmed calibration gas concentration in %
LFL is also displayed and adjusted with the alarm
setpoints.
The adjustment range for the alarm setpoints and
calibration gas concentration is as follows:
Low alarm 5 to 50% LFL
High alarm 10 to 60% LFL
Auxiliary alarm 3 to 90% LFL
Calibration gas 30 to 90% LFL
WARNING
Calibration gas concentration must be set at 50%
LFL when a PointWatch detector is used with the
R8471H Controller. Other calibration gas settings
may cause unreliable readings, which could
result in a fire or explosion.
The factory settings are:
Low alarm: 20% LFL
High alarm: 50% LFL
Auxiliary alarm: 50% LFL
Calibration gas: 50% LFL
To check the present levels, use the “Setpoint Display
Mode” described below. To change the values, use
the “Setpoint Adjustment Procedure”.
SETPOINT DISPLAY MODE
1. To enter the Setpoint Display mode, press and
hold the Reset button until the Low LED begins to
blink (approximately one second). Release the
Reset button. The low alarm setpoint will be
shown for two seconds on the digital display.
NOTE
The Reset button should be released as soon as
the controller has entered the Setpoint Display
mode (after one second). If the button is still
depressed at the end of the Setpoint Display
mode (9 seconds), the controller will
automatically enter the Calibrate mode. If the
operator is not prepared to perform a calibration,
a calibration fault will occur. Recycle power to
the controller to exit the calibrate mode without
affecting the calibration settings.
2. At the end of the two second interval, the Low
LED goes out, the High LED begins to blink, and
the digital display shows the high alarm setpoint.
3. Two seconds later the High LED goes out and the
Auxiliary LED blinks. The digital display now
shows the programmed auxiliary alarm setpoint.
95-84751.1 8

4. Two seconds later the Auxiliary LED goes out and
the CAL LED blinks. The digital display now
shows the calibration gas concentration. This
value should always be set at 50% LFL when a
PointWatch detector is used with the R8471H.
5. After displaying the calibration gas concentration
for two seconds, the controller automatically
leaves the Setpoint Display mode and returns to
the Normal operating mode.
6. If adjustments to the setpoints are required,
perform the Setpoint Adjustment procedure.
When the setpoint levels are acceptable, record
this information for future reference and perform
the Calibration procedure.
SETPOINT ADJUSTMENT PROCEDURE
1. Determine the required alarm setpoint levels.
2. Press and hold the Set button for one second,
then release. The digital display indicates the
present low alarm setpoint and the Low LED
blinks. Press the Reset button to increase the
reading or the Set button to decrease the reading.
(Pushing and holding the button will cause the
reading to change rapidly.)
3. When no changes to the setpoint level have been
made for 5 seconds, the Low LED goes out, the
High LED blinks, and the digital display shows the
high alarm setpoint. Press the appropriate button
(detailed in step 2 above) to obtain the desired
reading on the digital display.
4. When no changes to the setpoint level have been
made for 5 seconds, the High LED goes out, the
Auxiliary LED blinks, and the digital display shows
the auxiliary alarm setpoint. Press the appropriate
button to obtain the desired reading on the digital
display.
5. When no changes have been made for 5
seconds, the Auxiliary LED goes out, the CAL
LED blinks, and the digital display indicates the
calibration gas concentration. This value should
always be set at 50% LFL when a PointWatch
detector is used with the R8471H.
6. When no changes have been made for 5
seconds, the controller automatically returns to
the Normal operating mode.
7. Record the new values for future reference.
NOTE
The alarm setpoints, calibration gas
concentration, and calibration data are stored in
non-volatile memory and are retained in the
event of a power loss. However, if power is
interrupted while performing the Setpoint
Adjustment or Calibration procedure, the entire
procedure must be repeated when power is
restored.
CALIBRATION
The PointWatch IR gas detector is calibrated at the
factory for detection of methane gas. Recalibrating
the device for detection of methane before placing it
into operation is recommended, but not required. If
the application involves detection of other gases and
requires changing the PointWatch gas selection
rotary switch, the PointWatch must be recalibrated to
ensure accurate measurement.
Infrared gas detectors generally do not require the
same frequency of routine calibration as catalytic
sensors, however, unusual gas types and
applications may require special calibration
considerations. Refer to the PointWatch instruction
manual for additional information.
CALIBRATION PROCEDURE
Calibration of the R8471H/PointWatch combustible
gas detection system is a two step process —
calibrate PointWatch, then calibrate the controller.
NOTE
The PointWatch unit must always be calibrated
first.
PointWatch Calibration. PointWatch calibration
ensures a calibrated linear 4 to 20 ma input to the
controller.
PointWatch calibration is totally independent of the
R8471H Controller calibration. The PointWatch
calibration procedure can be performed by one
person, with all adjustments made at the PointWatch.
NOTE
During the time that the PointWatch is in the
calibrate mode, the R8471H indicates the status
of the PointWatch calibration on its digital display
(see Table 2). The controller cannot, however,
put the PointWatch unit into the calibrate mode
or control its calibration in any way.
Controller Calibration. This procedure calibrates the
controller’s displays and 4 to 20 ma output. Controller
995-84751.1

calibration typically requires two people, one at the
controller and another at the PointWatch. All
adjustments are made automatically by the controller.
The controller calibration procedure involves applying
a zero and span gas to the PointWatch, while the
controller calibrates its own display and current
output to the linear 4 to 20 ma current input provided
by the PointWatch. This procedure does not calibrate
the PointWatch.
CALIBRATING POINTWATCH
To calibrate the PointWatch unit, follow the calibration
procedure described in the PointWatch instruction
manual.
NOTE
For best calibration results, allow the PointWatch
detector to operate for at least an hour to ensure
a stable output before performing calibration.
95-84751.1 10
STATUS CONDITION
F9X Initialization failure. (Subcodes are as follows.)
F91 EPROM sumcheck failure.
F92 Sensor failure during startup - current too high or too low.
F93 Watchdog timer failure.
F94 RAM failure.
F95 Internal 5 volt power supply failure during startup.
F96 External 24 volt power supply failure during startup.
F97 Controller type invalid. Error in data from RAM.
F98 Watch dog timer reset the controller.
F70 External reset button has been activated for 15 seconds or longer. Self
clearing when button is released.
F60 External 24 vdc power input is not in the 18 to 32 vdc range.
F50 Internal 5 volt power supply is not in the 4.75 to 5.25 volt range.
F40 Sensor fault (after startup). Input is above 35 ma or below 0.5 ma.
F41 PointWatch unit has dirty optics.
F42 PointWatch calibration line fault.
F30 Negative zero drift. Sensor input is -9% full scale or lower.
F2X Calibration error. (Subcodes are as follows.)
F20 General calibration fault, or calibration aborted due to a higher priority
fault.
PointWatch calibration aborted.
F21 Time ran out while waiting for calibration gas to be applied to the sensor.
F22 Sensor input is too low. The sensor cannot generate enough offset to
get an accurate calibration. Replace sensor. Possible wiring fault.
F23 Sensor is too sensitive for the controller to read 100% full scale.
Replace sensor. Possible wiring fault.
F24 Zero gas level too high, or sensor zero input over limit.
F10 Sensor sensitivity problem.
CAL PointWatch in calibrate mode, doing Zero calibration.
SPn PointWatch in calibrate mode, doing Span calibration.
CC PointWatch in calibrate mode, successful calibration completed.
Table 2—System Status Codes

CALIBRATING THE CONTROLLER
The R8471H Controller can be calibrated using either
of two methods:
Factory Default Calibration
After the PointWatch has been calibrated, the
operator can set the controller for factory
programmed calibration default values. The
procedure is performed after the initial PointWatch
calibration and does not need to be repeated with
each subsequent PointWatch recalibration.
The controller is set for the factory default calibration
values as follows:
1. Press and hold the Reset button for approximately
9 seconds until the digital display begins flashing
and the CAL LED is illuminated. Release the
Reset button.
2. Press the Set button. The FAULT LED comes on.
3. Press the Reset button. The controller returns to
the normal operating mode (after a short time
delay).
4. The controller is now set for the factory default
values.
Field Calibration Procedure
1. Be certain that the controller is programmed for a
50% LFL calibration gas mixture. (See “Setpoint
Adjustment” section.)
2. Be sure that only clean air (0% LFL) is present at
the PointWatch. (The microprocessor begins
taking Zero readings immediately upon entering
the Calibrate mode.) If the possibility of
background gases exists, the PointWatch can be
purged with clean air to ensure accurate
calibration.
3. Place the controller in the calibrate mode by
depressing and holding the Reset button until the
CAL LED is illuminated and the digital display
starts to flash (approximately 9 seconds).
4. When the Zero calculations are complete (30
seconds minimum), the digital display stops
flashing.
5. Apply 50% LFL calibration gas to the PointWatch.
The digital display starts to flash.
6. When the microprocessor has completed the
Span adjustments (30 seconds minimum), the
digital display stops flashing.
7. Remove the calibration gas. When the gas level
falls below the lowest alarm setpoint, the
controller automatically exits the Calibrate mode.
If the operator fails to complete the calibration
procedure or if a successful calibration cannot be
completed, a calibration fault (“F2X” status) will be
generated and the controller will automatically revert
back to the former calibration settings (after 10
minutes).
CURRENT OUTPUT CALIBRATION
The controller’s 4 to 20 milliampere output is
calibrated at the factory, however, it can be
recalibrated by performing the following procedure.
1. A dc current meter capable of measuring 4 to 20
milliamperes must be connected to the current
loop output. This can be accomplished in one of
the following ways:
— by disconnecting all loads and connecting a
dc ammeter between the two 4 to 20
milliampere terminals,
— by connecting a dc ammeter in series with
the load,
— by connecting a digital dc voltmeter across a
known load resistance and calculating the
current flow using the formula:
I = voltage/load resistance.
2. Press and hold the Set button, then immediately
press the Reset button. (The Reset button must
be pressed within one second of pressing the Set
button.) Release both buttons. The Low LED
should flash slowly. The flashing Low LED
indicates that the system is now generating a 4
ma output.
3. Press the Reset (increase) or Set (decrease)
button to obtain a 4 ma reading on the meter.
(Pressing and holding the button will cause the
output to change rapidly.)
4. When no adjustments have been made for 7
seconds, the controller automatically switches to
a 20 ma output. This is indicated by a flashing
High LED. Press the appropriate button to obtain
a 20 ma reading.
11 95-84751.1

5. When no adjustments have been made for 7
seconds, the controller generates the current
output level for the calibrate mode. This is
indicated by a flashing CAL LED. Press the
appropriate button to obtain the desired current
output level for the calibrate mode.
6. When no changes have been made for 7
seconds, the controller automatically returns to
the Normal operating mode and saves the data in
non-volatile memory.
7. Remove the meter from the system output.
Section II
Description and Operating
Characteristics
FACEPLATE DESCRIPTION
The faceplate of the controller provides LEDs for
identifying status conditions, a digital display and bar
graph display for indicating the sensor input, and
pushbuttons for programming, calibrating and
resetting the system. See Figure 9 for the location of
indicators and pushbuttons.
1. Digital Display - In the Normal mode, the digital
display provides a continuous reading of the input
from the PointWatch. An input signal less than 4
ma is displayed as a negative reading by the
controller. An input signal greater than 20 ma is
displayed as an over-range reading by the
controller.
In the event of a fault, the digital display identifies
the nature of the fault using an alpha-numeric
code. When the PointWatch unit is in the calibrate
mode, the display tracks the calibration
procedure. In other operating modes it shows the
alarm setpoints and programmed calibration gas
concentration. Since this display is always lit, it
also functions as a power indicator.
2. Bar Graph Display - In the Normal mode, the 20
segment bar graph display provides a reading of
sensor input in 5% LFL increments.
3. High Alarm LED - Flashes in response to a
sensor signal that exceeds the high setpoint.
4. Auxiliary Alarm LED - Flashes in response to a
sensor signal that exceeds the auxiliary setpoint.
5. Low Alarm LED - Flashes in response to a
sensor signal that exceeds the low setpoint.
NOTE
The alarm LEDs flash when the setpoint is
exceeded and are on steady (until reset) when
the gas level drops below the setpoint, whether
the corresponding alarm output is latching or
non-latching.
6. Cal LED - Illuminated while the controller is in the
calibrate mode.
NOTE
In the Setpoint Display or Setpoint Adjust mode,
a flashing alarm LED identifies the particular
setpoint currently being indicated on the digital
display. A flashing Cal LED indicates that the
programmed calibration gas concentration (in %
LFL) is currently being shown on the digital
display.
95-84751.1 12
DIGITAL DISPLAY
BAR GRAPH
CAL LED
FAULT LED
➀
➁
➅
⑦
A1384
➇RESET
PUSHBUTTON
➈ SET
PUSHBUTTON
⑤LOW LED
➃AUXILIARY LED
➂HIGH LED
Figure 9—Controller Front Panel

7. Fault LED - Flashes upon detection of a system
fault and is on steady during the power-up time
delay.
8. Reset Pushbutton - Used for various system
programming and calibration functions as well as
for resetting the controller.
9. Set Pushbutton - Used for various system
programming and calibration functions.
OUTPUTS
The R8471H Controller is available in a Base version
and a Premium version. The differences between the
two models are the output configuration and
programming options.
Base Model - The base controller is furnished with
open collector transistor outputs (rated 100
milliamperes at 32 volts dc) for the Low alarm, High
alarm, Auxiliary alarm, and Fault circuits. The normally
de-energized alarm outputs are energized when their
corresponding setpoints are exceeded. The fault
output is normally energized and becomes de-
energized upon detection of a system fault.
Premium Model - The premium model is furnished
with a set of four relays in place of the four solid state
outputs. The relays have SPST contacts rated 5
amperes at 30 vdc or 250 vac.
This model also includes a selectable isolated/non-
isolated 4 to 20 ma dc current output for transmitting
system information to other monitoring devices. The
linear 4 to 20 ma output corresponds to levels from 0
to 100% LFL. If a system fault is detected, the output
drops to less than 1.0 ma. The current output can be
calibrated in the field to ensure maximum accuracy.
(Refer to the “Calibration” section of this manual for
details.)
AUTOMATIC DIAGNOSTICS AND
FAULT IDENTIFICATION
The microprocessor based controller features self-
testing circuitry that continuously checks for faulty
sensor or open sensor wiring, low or high input
voltage, and other problems that could prevent
proper system response. When power is applied, the
microprocessor automatically tests memory. In the
Normal operating mode, it continuously monitors the
input signal from the PointWatch to ensure proper
functioning. In addition, a “watchdog” timer is
maintained to ensure that the program is running
correctly. If a fault should occur:
— The Fault LED flashes.
— The digital display identifies the nature of the fault
using an alpha-numeric code. Refer to Table 2 for
an interpretation of the codes.
— The normally energized Fault output is de-
energized.
— The dc current output drops to less than 1 ma.
NOTE
The fault code will be shown for about 2 seconds
out of every 5 seconds. The gas concentration at
the sensor will be displayed during the remaining
time. If more than one fault should occur, the
highest priority fault will be displayed. (Table 2
lists the faults in order of priority.)
An alarm condition will normally over-ride a fault
condition unless the fault condition occurred first
(except F10, F2X). However, faults that affect the
actual function of the controller (F50, F60, F70, F9X)
may impair the ability of the controller to maintain an
alarm output.
All faults automatically reset except the F9X, F20, and
F10 faults. After the fault condition has been
corrected, the fault output automatically switches to
the normal (energized) state, the dc current output
returns to normal, and the Fault LED turns off.
Clearing F9X faults requires removing operating
power from the controller for approximately one
second.
CAUTION
The fault detection circuitry does not monitor the
operation of external response equipment or the
external wiring to these devices. It is important
that these devices be checked periodically to
ensure that they are operational.
OPERATING MODES
The controller can operate in any of the following
modes. See Figure 10. Operating modes other than
Normal are selected by pressing the appropriate
pushbutton(s) located on the controller front panel.
NORMAL
In the Normal operating mode with no alarm
condition:
— Digital display is on and indicates the sensor input
in % LFL.
— Bar graph display reads the same as the digital
display.
13 95-84751.1

— All LEDs are off.
— Alarm outputs are in their normal state (energized
or de-energized as programmed).
— Dc current output signal level corresponds to
sensor input.
— Fault output is energized.
In the Normal operating mode with a low and/or
auxiliary alarm condition occurring:
— Digital display and bar graph display indicate the
sensor input in % LFL.
— Low and/or Auxiliary LED flashes.
— Low and/or Auxiliary alarm output changes state.
— Dc current output signal level corresponds to
sensor input.
— Fault output energized and LED off.
When the signal decreases below the low or auxiliary
setpoint:
— Digital display, bar graph display, and 4 to 20 ma
output continue to track the sensor input.
— With latching operation programmed: No change
to alarm outputs.
— With non-latching operation programmed: Alarm
outputs return to their normal state.
— Low and Auxiliary LEDs are on steady until reset.
In the Normal operating mode and a high alarm
condition occurring:
— Same as low or auxiliary alarm, but High LED is on
and high alarm output is actuated.
When the signal decreases below the high alarm
setpoint:
— The high alarm is always latching and unaffected
by the latching/non-latching programming for the
low and auxiliary alarms. High LED is on steady
until reset.
In the event of a system fault:
— The normally energized Fault output is de-
energized and the Fault LED is illuminated.
RESET
The Reset mode is entered by pressing the Reset
button located on the front panel of the controller.
(See Figure 10.)
When the Reset button is momentarily depressed:
With no alarms or faults are occurring — all LEDs turn
off and all outputs return to their normal condition
(basic reset).
If an alarm or fault condition exists — the basic reset
will not reset the outputs.
95-84751.1 14
POWER-UP
TIME
DELAY
NORMAL RESET
< 0.5 SECOND 0.5 SECOND 1.0 SECOND
SET
1.0 SECOND
NO
YES
BASIC
RESET FORCED RESET
RELEASE
RESET
RELEASE
RESET
RELEASE
RESET
SETPOINT
DISPLAY
HOLD
RESET
HOLD
RESET
HOLD
RESET
SETPOINT
ADJUST
CURRENT
CALIBRATE
RESET
PUSHED WITH
SET?
CALIBRATE
9.0 SECONDS
A1957
Figure 10—R8471H Controller Flow Chart

When the Reset button is held for 0.5 second:
If an alarm or fault condition exists — the LEDs turn
off and the outputs return to their normal condition
(forced reset).
NOTE
If an alarm or fault condition exists, the controller
will return to alarm or fault status when the reset
button is released.
Remote reset capability is also provided. (Remote
reset performs a forced reset.)
NOTE
The remote reset performs a reset function only.
It cannot be used for entering other controller
operating modes.
OTHER OPERATING MODES
Setpoint Display, Setpoint Adjustment, Calibration,
and 4 to 20 ma Current Output Calibration modes are
also executed by pressing buttons on the controller
faceplate. Refer to the appropriate sections of this
manual for details.
SPECIFICATIONS
OPERATING VOLTAGE—
24 vdc recommended. Operating range of 18 to 32
vdc.
POWER CONSUMPTION (controller only, no trans-
mitter or sensor included)—
Base model: 0.7 watt nominal, 1.3 watts
maximum (25 ma nominal, 50 ma
maximum at 24 vdc.)
Premium model: 1.2 watts nominal, 3.5 watts
maximum (50 ma nominal, 145 ma
maximum at 24 vdc.)
MAXIMUM SUPPLY VOLTAGE RIPPLE—
Should not exceed 5 volts peak-to-peak. The sum of
dcV plus ripple must be ≥18 vdc and ≤32 vdc.
TEMPERATURE RANGE—
Operating: +32°F to +140°F (0°C to +60°C)
Storage: -49°F to +185°F (-45°C to +85°C).
OPERATING RANGE—
0 to 100% LFL.
SOLID STATE OUTPUTS (Base model only)—
Open collector transistors with a 100K resistor from
the collector to emitter with the emitter grounded,
rated 100 milliamperes at 32 volts dc maximum.
RELAY CONTACTS (Premium model only)—
Selectable normally open/normally closed contacts
rated 5 amperes at 30 vdc/250 vac. See Table 1 for
selectable relay options.
CURRENT OUTPUT (Premium model only)—
4 to 20 milliampere dc current, with a maximum loop
resistance of 600 ohms at 24 vdc. User-selectable
isolated or non-isolated signal reference from
controller input power common return.
DIMENSIONS—
See Figure 11.
SHIPPING WEIGHT (approximate)—
2.0 pounds (0.9 kilogram).
15 95-84751.1
➛
➛
9.3 (23.6)
1.0
(2.5)
7.0*
(17.8)
➛
➛
➛
➛
A1526 *4U DIMENSIONS SHOWN, 3U HEIGHT IS 5.2 (13.3)
Figure 11—Controller Dimensions in Inches (Centimeters)

SYSTEM APPROVAL—
The R8471H Combustible Gas Controller, base and
premium model in 3U and 4U height, has been tested
and approved by FMA. It can be used with any FMA
approved gas sensing device capable of generating
a 4 to 20 ma input. FMA approval of the R8471H
Combustible Gas Controller, however, does not
include or imply approval of input devices such as
sensors or transmitters, or devices connected to the
controller outputs. To maintain FMA system approval,
all equipment connected to the controller must be
FMA approved.
NOTE
Ensure sensor hazardous (classified) location
rating is applicable for the intended use.
The R8471H Combustible Gas Controller must be
used only in non-hazardous locations.
CENELEC: CE Mark, EN 61779-4 Compliant.
(Combustible gas performance).
Refer to Appendix C.
0539
DEMKO 04 ATEX 134903X
II (2) G.
Special Conditions for Safe Use (“X”):
Performance temperature rating 0°C to +60°C.
The R8471H Combustible Gas Controller must be
placed outside the Hazardous area.
The R8471H Combustible Gas Controller must be
used only in conjunction with stand-alone 4-20 mA
CENELEC certified Combustible Gas Sensors.
Section III
System Maintenance
TROUBLESHOOTING
Table 3 is intended to serve as an aid in locating the
cause of a system malfunction.
NOTE
Record all faults on the Fault Record Sheet
supplied with this manual.
The R8471H Controller is not designed to be repaired
in the field. If a problem should develop, first carefully
check for proper wiring, programming and
calibration. If it is determined that the problem is
caused by a defect in the controller’s electronics, the
device must be returned to the factory for repair.
NOTE
When replacing a controller, be sure that the
jumper plugs and rocker switches of the
replacement are the same as the original.
Remove power before removing the device from
the mounting cage or plugging in the
replacement unit.
ROUTINE MAINTENANCE
The gas detection system requires virtually no routine
maintenance, except for periodic checks to assure
proper system function and calibration. The
frequency of these checks is determined by the
requirements of the particular installation.
MANUAL CHECK OF OUTPUT DEVICES
Fault detection circuitry continuously monitors for a
sensor problem, excessive negative zero drift, wiring
problems, and various other problems that could
prevent proper response to a dangerous level of gas.
It does not monitor external response equipment or
the wiring to these devices. It is important that these
devices be checked initially when the system is
installed, as well as periodically during the ongoing
maintenance program.
CHECKOUT IN NORMAL MODE
The system must be checked periodically in the
Normal mode to ensure that those items not checked
by the controller diagnostic circuitry are functioning
properly.
CAUTION
Be sure to secure all output devices that are
actuated by the system to prevent unwanted
activation of this equipment, and remember to
place these same output devices back into
service when the checkout is complete.
POINTWATCH MAINTENANCE
Refer to the PointWatch instruction manual for
information regarding maintenance or repairs to the
PointWatch unit.
It is recommended that power be removed prior to
performing maintenance, repair or replacement.
A Recommended Test Form is supplied at the back of
this manual for recording maintenance performed on
the system.
95-84751.1 16

17 95-84751.1
Problem Possible Cause
No faceplate indicators 1. Wiring to external power source.
illuminated. 2. Input power failure.
FAULT LED on, digital 1. Power-up time delay (up to 5 minutes).
display blank. 2. If condition continues after 5 minutes, repeat power-up. If problem con-
tinues, replace controller.
F91 to F98 Status 1. Initialization failure. Repeat power-up. If successful, re-program and
re-calibrate. If not, replace controller.
F92 Status 1. Sensor failure (during startup) - current is over 35 ma or below 0.5 ma.
F94 Status 1. RAM failure. Repeat power-up. If not successful, return to factory for
repair. Do not press RESET button. If RESET is pressed, recalibrate
and check setpoints.
F96 Status 1. Input power problem (should be 18 to 32 volts). Check operation of
power source and power wiring.
F97 Status 1. Controller type invalid. Error in data from RAM. Repeat power-up. If not
successful, return to factory for repair. Do not press RESET button. If
RESET is pressed, recalibrate and check setpoints.
F70 Status 1. External reset activated for over 15 seconds. Check external switch and
wiring.
F60 Status 1. Input power out of tolerance. Check operation of power source and
power wiring.
F50 Status 1. Internal power supply problem. Replace controller.
F40 Status 1. Sensor output (after startup) is over 35 ma or below 0.5 ma. Check
PointWatch wiring and calibration.
2. Faulty sensor. Replace and calibrate.
F41 Status 1. PointWatch has dirty optics. Refer to PointWatch manual.
F42 Status 1. PointWatch calibration line fault.
F30 Status 1. Negative zero drift. Calibrate sensor.
2. Faulty sensor. Replace and calibrate.
F20, F21 Status 1. Calibration error. Re-calibrate.
F22, F23 Status 1. Sensor sensitivity out of tolerance. Calibrate PointWatch. If problem
continues, replace sensor and calibrate.
F24 Status 1. Wrong gas for zero calibration.
2. Background gas affecting the zero calibration.
3. Sensor zero input over limit, re-calibrate PointWatch.
F10 Status 1. Sensor sensitivity problem.
Table 3—Troubleshooting Guide

DEVICE REPAIR AND RETURN
Prior to returning devices or components, contact the
nearest local Detector Electronics office so that an
RMI (Return Material Identification) number can be
assigned. A written statement describing the
malfunction must accompany the returned device or
component to expedite finding the cause of the
failure, thereby reducing the time and cost of the
repair.
Pack the unit or component properly. Use sufficient
packing material in addition to an anti-static bag or
aluminum-backed cardboard as protection from
electrostatic discharge.
Return all equipment transportation prepaid to the
factory in Minneapolis.
ORDERING INFORMATION
The PointWatch Detector must be ordered separately
from the controller. When ordering please specify:
R8471H Combustible Gas Controller
Specify base or premium model, 3U or 4U height.
MOUNTING RACKS
A mounting rack is required for controller installation.
3U racks are slightly shorter in height than the 4U
models, and are not rack-compatible with flame
controllers. 4U racks can house gas or flame
controllers in any combination. See Figures 1 and 2.
Rack sizes are available to handle up to 8 flame
controllers or up to 16 gas controllers.
GAS DETECTOR
• PointWatch Infrared Hydrocarbon Gas Detector
• Junction box for PointWatch Detector
CALIBRATION KITS
Calibration Kit includes regulator, hose, calibration
cup, and two cylinders of calibration gas. Available
gases are:
Methane - 50% LFL
Ethane - 50% LFL
Ethylene - 50% LFL
Propane - 50% LFL
Replacement Parts for Calibration Kit
Regulator
3 foot hose
Replacement Cylinders
Methane (50% LFL)
Ethane (50% LFL)
Ethylene (50% LFL)
Propane (50% LFL)
Air (0% LFL)
For assistance in ordering a system to meet the
needs of a specific application, please contact:
Detector Electronics Corporation
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Operator: [phone] or (800) 765-FIRE
Customer Service: [phone]
Fax: [phone]
Web site: www.det-tronics.com
E-mail: [email protected]
95-84751.1 18