Det-Tronics PIR9400 User manual

INSTRUCTIONS
PointWatch™ Infrared
Hydrocarbon Gas Detector
PIR9400
11/96 Form 95-8440
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APPLICATION ..........................................................................1
FEATURES...............................................................................1
SPECIFICATIONS....................................................................1
DESCRIPTION..........................................................................4
Detection Method...............................................................4
Current Loop Output..........................................................4
Operating Modes...............................................................4
INSTALLATION.........................................................................5
Detector Location...............................................................6
0 to 100% LFL Linearized Output Options.........................6
Junction Boxes ..................................................................7
General Wiring Requirements ...........................................8
Detector Wiring Procedure ................................................8
Detector Separation (Optional)..........................................8
STARTUP PROCEDURE .......................................................10
CALIBRATION........................................................................10
Calibration Equipment .....................................................10
Calibration Procedures....................................................11
TROUBLESHOOTING............................................................15
MAINTENANCE......................................................................15
Disassembly and Cleaning Procedure.............................16
To Replace the IR Module...............................................17
DEVICE REPAIR AND RETURN............................................18
Office Locations...............................................................18
ORDERING INFORMATION...................................................19
PointWatch Detector........................................................19
Junction Boxes ................................................................19
Calibration Equipment .....................................................19
Spare Parts......................................................................19
ASSISTANCE .........................................................................19
APPENDIX..............................................................................20
Approval...........................................................................20
Attachment/Options.........................................................20
Calibration........................................................................20
List of Illustrations
Figure 1 4 to 20 ma Current Loop Resistance.....................2
Figure 2 PointWatch Wiring Requirements .........................3
Figure 3 Aluminum PointWatch Unit Dimensions
in Inches (MM).......................................................3
Figure 4 Stainless Steel PointWatch Unit Dimensions
in Inches (MM).......................................................3
Figure 5 Junction Box Dimensions in Inches (MM) .............4
Figure 6 Tall PointWatch Junction Box with Window ..........5
Figure 7 Short PointWatch Junction Box ............................5
Figure 8 PointWatch Gas Absorption Curves......................6
Figure 9 Aluminum PointWatch Disassembly......................7
Figure 10 Stainless Steel PointWatch Disassembly..............7
Figure 11 IR Module and Base Assemblies ..........................7
Figure 12 IR Module Removal...............................................7
Figure 13 Gas Selection Switch Location at the Bottom
of the Electronics Assembly ..................................7
Figure 14 Typical PointWatch Wiring,
Standalone Configuration......................................9
Figure 15 Typical PointWatch Wiring,
PointWatch with Det-Tronics Junction Box ...........9
Figure 16 Junction Box Terminals and Calibration Switch ....9
Figure 17 Typical PointWatch Wiring
with Det-Tronics Infiniti Transmitter.....................10
Figure 18 Typical PointWatch Wiring
with Eagle Communication Module.....................10
Figure 19 Options for Detector Separation..........................10
Figure 20 Sensor Separation with Infiniti Transmitter
and PointWatch...................................................11
Figure 21 Aluminum PointWatch Detector Calibration Port.13
Figure 22 Aluminum PointWatch Detector Calibration
Configuration.......................................................13
Figure 23 Stainless Steel PointWatch Detector Calibration
Configuration.......................................................13
Figure 24 Aluminum PointWatch Detector Disassembly
for Cleaning.........................................................16
Figure 25 Stainless Steel PointWatch Detector
Disassembly for Cleaning....................................17
List of Tables
Table 1 Current Loop Output Levels and Corresponding
Status Indications..................................................2
Table 2 Mounting Orientation.............................................6
Table 3 Installation Options for Intrusive and
Non-intrusive Calibration.......................................8
Table 4 Calibrate or Check...............................................11
Table 5 Calibration Sequence, Inhibited Current Output..12
Table 6 Troubleshooting Table.........................................15
Table of Contents
ii

INSTRUCTIONS
PointWatch™ Infrared
Hydrocarbon Gas Detector
PIR9400
©Detector Electronics Corporation 1996 11/96 95-8440
APPLICATION
The PointWatch Detector is a diffusion-based point-type
infrared gas detector that provides continuous monitor-
ing of combustible hydrocarbon gas concentrations in
the range of 0 to 100% LFL. The detector provides a 4
to 20 milliampere output signal, corresponding to the
detected gas concentrations. The explosion-proof sen-
sor housing meets FM, CSA and CENELEC require-
ments for use in hazardous environments.
PointWatch is ideally suited for use in harsh environ-
ments and where the cost of required maintenance for
conventional catalytic detectors is prohibitive. The
PointWatch IR Detector will perform reliably in the pres-
ence of silicone and other catalytic poisoning agents
and can also operate in oxygen free environments or
where high background gas levels are present. There
are no known poisons that affect this technology.
The PointWatch detector can be used alone or as part
of a larger system such as Det-Tronics’ Infiniti Gas
Transmitter, R8471 Controller, or Eagle 2000 Hazard
Monitoring System.
FEATURES
•Requires no routine calibration to ensure proper oper-
ation.
•Continuous self-test automatically indicates a fault or
fouled optics condition.
•Unique multi-layered filtering system protects optics
from dirt and water ingress.
•Internal heating system minimizes condensation,
allowing reliable operation through temperature
extremes.
•Performs well in the presence of high concentrations
or constant background levels of hydrocarbons and in
oxygen depleted atmospheres.
•There are no known poisons, e.g. silicones or
hydrides, that compromise the integrity of the mea-
surement.
• Standard 4 to 20 milliampere output (current source).
• Standard 0 to 100% LFL detection range.
•Compact, lightweight, explosion-proof housing is
designed for duty in harsh environments.
SPECIFICATIONS
INPUT VOLTAGE—
+24 vdc nominal (range +18 to +32 vdc).
POWER CONSUMPTION (Watts)—
Input Voltage: 18 vdc 24 vdc 32 vdc
Nominal 3.5 4.6 6.2
Maximum 4.0 5.5 7.0
DETECTION RANGE—
0 to 100% LFL.
GASES —
Will respond to most hydrocarbon gases. Outputs lin-
earized for 0 to 100% LFL are provided for methane,
ethane, propane/butane, ethylene, propylene.
All devices are shipped with a 0 to 100% LFL linearized
output for methane. Other linearized outputs are field
selectable by means of a switch.
CURRENT OUTPUT (NON-ISOLATED)—
Linear 4 to 20 ma current source.
• 4 to 20 ma output indicates 0 to 100% LFL
detection range (for linearized gases)
• 23.2 ma indicates over-range condition (120%
LFL)
• 0 to 2.4 ma levels indicate calibration, fault and
fouled optics conditions.
Refer to Table 1 for a detailed description of current out-
puts.
Maximum loop resistance: 600 ohms at +24 vdc. See
Figure 1 for further information.

The following specifications for Accuracy, Stability
and Repeatability are based on a 0 to 100% LFL
methane calibration
ACCURACY (Room Temperature)—
±3% LFL from 0 to 50% LFL, ±5% LFL from 51% to
100% LFL.
RESPONSE TIME (Seconds)— T50 T90
Aluminum
Outside weather baffle only 6 17
All weather protection installed 9 21
Stainless Steel
All weather protection installed 2 5
(Det-Tronics verified)
STABILITY—
Temperature
Zero: ±2% LFL from
–40°F to +167°F (–40°C to +75°C).
Span: ±5% LFL at 50% LFL from
–13°F to +167°F (–25°C to +75°C),
±10% LFL at 50% LFL from
–40°F to –13°F (–40°C to –25°C).
Time (10 months) ±2% LFL (Det-Tronics verified).
REPEATABILITY (Room Temperature)—
Zero: ±1% LFL.
Span: ±2% LFL at 50% LFL.
(Det-Tronics verified)
WIRING—
The PointWatch detector has five 22 AWG wires, 20
inches long for wiring into a junction box or the Infiniti
transmitter.
Red = + 24 volts dc
Black = – (common)
White = 4 to 20 milliampere signal output
Yellow = Calibration input
Green = Chassis ground
Power Wiring: 18 AWG minimum is recommended for
power wiring. Larger diameter wire may be required to
maintain a minimum of 18 vdc (including ripple) at the
sensor for all operating conditions (see Figure 2). For
maximum EMI/RFI protection, shielded cable is recom-
mended.
OPERATING TEMPERATURE RANGE—
–40°C to +75°C (–40°F to +167°F).
HUMIDITY (Non-Condensing)—
0 to 99% relative humidity (Det-Tronics verified)
5 to 95% relative humidity (FMRC/CSA verified).
RFI/EMI PROTECTION—
EN50081-1. Class B, EN50082-1 (IEC 801-2, 3, 4). (ETL
verified -EMC).
Operates properly with 5 watt walkie talkie keyed at 1
meter.
INGRESS PROTECTION—
IP66 (DEMKO certified per EN60529).
ENCLOSURE MATERIALS—
Aluminum (clear anodized) enclosure and weather pro-
tection baffles. Content: 0.8% to 1.2% Mg, 0.15% to
0.40% CU.
Stainless Steel (316 electropolished) enclosure, polyph-
thalamide (PPA) weather protection baffle.
2
1000
900
800
700
600
500
400
300
18 20 22 24
INPUT VOLTAGE
26 28 30 32
LOOP RESISTANCE (OHMS)
A1750
Figure 1—4 to 20 ma Current Loop Resistance
Table 1—
Current Loop Output Levels and Corresponding Status Indications
Current Level Status
23.2 ma Over-range (120% LFL)
20.0 ma Full scale (100% LFL)
4.0 ma Zero gas level (0% LFL)
2.2 ma Zero calibration in progress
2.0 ma Span calibration in progress
1.8 ma Calibration complete - remove gas
1.6 ma Calibration fault
1.0 ma Fouled optics
0.8 ma 24 vdc line low (less than 17.5 vdc)
0.6 ma Calibrate input active at power-up
(probable wiring fault)
0.4 ma Active channel fault
0.2 ma Reference channel fault
0.0 ma CPU system fault, warmup

CERTIFICATION—
PointWatch Aluminum Stainless Steel
CENELEC1X X
FM2X
CSA3X
Gosstandart4X X
1CENELEC: Certificate No. 95D.119043
EEx d IIB + H2 T6 (Tamb –40°C to +40°C)
EEx d IIB + H2 T5 (Tamb –40°C to +75°C).
Ingress protection IP66.
2FM: Explosion-proof for Class I, Div. 1, Groups B,
C & D per FM 3615. Performance per FM
6320. (See Appendix for approval descrip-
tion.)
3CSA: Explosion-proof for Class I, Div. 1, Groups B,
C & D per CSA C22.2 No. 30. Performance
per CSA C22.2 No. 152.
4Gosstandart: Certificate No. A-0272; Performance
Certificate No. 1039.
1Ex d IIB T6/H2 (Tamb. -40°C to +40°C)
1Ex d IIB T5/H2 (Tamb. -40°C to +75°C).
Junction Box Aluminum Stainless Steel
CENELEC5X N/A
FM6X N/A
CSA7X N/A
Gosstandart8Pending N/A
5CENELEC: Certificate No. 96D1115
EEx d IIC T6 (Tamb –60°C to +40°C)
EEx d IIC T5 (Tamb –60°C to +75°C).
Ingress protection IP66.
6FM: Explosion-proof for Class I, Div. 1, Groups B,
C & D per FM 3615.
7CSA: Explosion-proof for Class I, Div. 1, Groups B,
C & D per CSA C22.2 No. 30.
8Gosstandart:
1Ex d IIC T6 (Tamb –60°C to +40°C)
1Ex d IIC T5 (Tamb –60°C to +75°C).
MOUNTING—
Detector can be threaded into any approved junction
box suitable for the specific applications. (Junction box
spacers may be required for flush mounting.)
PointWatch thread options:
• 3/4 inch NPT
• M20 (for use outside North America).
SHIPPING WEIGHT—
Aluminum: 2.8 pounds (1.3 kilograms).
Stainless Steel: 4.8 pounds (2.2 kilograms).
DIMENSIONS—
See Figures 3 and 4 for the dimensions of the
PointWatch Detector and Figure 5 for dimensions of the
PointWatch Junction Box.
TERMINALS—
Terminals UL/CSA rated for 14 to 22 AWG wire; termi-
nals DIN/VDE rated for 2.5 mm2wire.
A1752
8.95
(227)
2.5
(64)
3/4 – NPT
M20 X 1.5
M25 X 1.5
A1751
5000
4800
4600
4400
4200
4000
3800
3600
3400
3200
3000
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
018 20 22 24
POWER SUPPLY VOLTAGE (VDC)
26 28 30 32
WIRING DISTANCE (FT)
18 AWG
16 AWG
14 AWG
12 AWG
3 95-8440
Figure 2—PointWatch Wiring Requirements
Figure 3—Aluminum PointWatch Unit Dimensions in Inches (MM)
A1753
9.50
(241)
3.25
(83)
Figure 4—Stainless Steel PointWatch Unit Dimensions in Inches (MM)

DESCRIPTION
DETECTION METHOD
PointWatch operates on the infrared absorption principle.
A beam of modulated light is projected from an internal
infrared source to a reflector, which sends it back to a
pair of infrared sensors. One of the sensors is designat-
ed reference and the other active, with different optical fil-
ters in front of the two sensors to make them selective to
different infrared wavelengths. The reference wavelength
is unaffected by combustible gases, while the active
wavelength is absorbed by combustible gases. The ratio
of the active to the reference wavelength is computed
within the PointWatch detector to determine the concen-
tration of gas present. This value is then converted into a
4 to 20 milliampere current output for connection to exter-
nal display and control systems.
CURRENT LOOP OUTPUT
During normal operation, the PointWatch detector has a
current output from 4 to 20 milliamperes that is propor-
tional to gas concentrations from 0 to 100% LFL. A cur-
rent output other than 4 to 20 milliamperes indicates
either negative gas level, a fault or over-range condition,
or that the unit is in the calibrate mode as indicated in
Table 1.
OPERATING MODES
Warmup
When power is applied to the detector, it enters a
Warmup mode (for approximately one minute) in which
it performs diagnostic checks and allows the sensors to
stabilize before beginning normal operation. The cur-
4
Figure 5—Junction Box Dimensions in Inches (MM)
6.5
(16.5)
3.38 (8.4)
4.1 (10.4)
B1520
4.5 (11.4)
4.1
(10.4)
3/4 INCH NPT (2)
0.3 DIA.
(0.8)
TALL COVER J-BOX
3.7
(9.4)
3.3
(8.4)
4.1
(10.4)
B1482
4.5
(11.4)
4.1
(10.4)
0.3 DIA.
(0.8)
SHORT COVER J-BOX
3/4 INCH NPT (2)
20 MM OPTIONAL

rent output during this period is 0 milliamperes. At the
end of the warmup period with no faults present, the
detector automatically enters the Normal operating
mode. If a fault is present after the warmup, the detec-
tor current output will indicate a fault.
Normal
In the normal operating mode, the 4 to 20 milliampere
signal level corresponds to the detected gas concentra-
tion. The detector continuously checks for system faults
or initiation of calibration, and automatically changes to
the appropriate mode.
Fault
Faults detected during warmup, normal operation, or
calibration are indicated by the current loop output as
shown in Table 1.
Calibration
When the calibration lead is momentarily connected to
the negative lead (common) of the power supply, the
microprocessor executes the zero and span calibration
sequence. The output current during calibration
defaults to an inhibited state. See Table 1.
NOTE
The current output during calibration can be set for
live operation, however, this method is not usually
recommended. Refer to the “Calibration” section
for further information.
Two junction box types for use specifically with the
PointWatch detector are available from Det-Tronics.
• Tall Cover/Window Junction Box for one person,
non-intrusive calibration. This junction box includes
a magnetic reed calibration switch, calibration LED
and a windowed cover. Activating the magnetic
reed switch with the calibration magnet and viewing
the LED through the window provides one person,
non-intrusive calibration capability. See Figure 6.
• Short Cover Junction Box for PointWatch requires
two people to accomplish non-intrusive calibration.
This junction box includes a magnetic reed calibra-
tion switch, calibration LED and a solid cover.
Activating the magnetic reed calibration switch with
the calibration magnet or touching the calibration
lead to the negative lead (common) of the power
supply using an external switch are methods used
to initiate calibration. This junction box can also be
used for sensor separation. See Figure 7.
INSTALLATION
IMPORTANT
Hydrocarbon-based grease will emit hydrocarbon
vapors which will be measured by PointWatch and
will result in inaccurate gas level readings. Use
only low vapor pressure silicone grease when
lubricating threads on the PointWatch detector
and associated junction box. Do not get this
grease on the optics of the detector. A suitable
grease is listed in the “Spare Parts” section at the
end of this manual.
IMPORTANT
In applications where both PointWatch and catalyt-
ic type sensors are used, ensure that the silicone
grease used to lubricate the PointWatch detector
threads does not come into contact with the cat-
alytic sensors or poisoning of the catalytic sensors
will result. It is strongly recommended that mainte-
nance personnel wash their hands between han-
dling the two types of sensors.
5 95-8440
Figure 6—Tall PointWatch Junction Box with Window Figure 7—Short PointWatch Junction Box

DETECTOR LOCATION
It is essential that the device be properly located to
enable it to provide maximum protection. The most
effective number and placement of sensors varies
depending on the conditions at the job site. The indi-
vidual designing the installation must rely on experience
and common sense to determine the type and quantity
of sensors and the best sensor locations to adequately
protect the area. The following factors should be con-
sidered for every installation:
1. What kind of gas is to be detected? If it is lighter
than air, place the sensor above the potential gas
leak. Place the sensor close to the floor for gases
that are heavier than air or for vapors resulting from
flammable liquid spills. However, note that air cur-
rents can cause a gas that is heavier than air to
rise. In addition, if the gas is hotter than ambient air
or mixed with gases that are lighter than air, it could
also rise.
2. How rapidly will the gas diffuse into the air? Select
a location for 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. Movement of air may
cause gas to accumulate more heavily in one area
than another. The detector should be placed in the
areas where the most concentrated accumulation of
gas is anticipated. Also take into consideration the
fact that many ventilation systems do not operate
continuously.
4. Proper orientation is dependent upon the
PointWatch model used and the environmental con-
cerns at the installation. See Table 2.
5. The sensor should be accessible for maintenance.
6. Excessive heat or vibration can result in premature
failure of any electronic device and should be
avoided if possible.
NOTE
For additional information on determining the quan-
tity and placement of gas detectors in a specific
application, refer to the article titled “The Use of
Combustible Detectors in Protecting Facilities from
Flammable Hazards” contained in the Instrument
Society of America (ISA) Transaction, Volume 20,
Number 2.
0 TO 100% LFL LINEARIZED OUTPUT OPTIONS
The PointWatch detector is factory configured for 0 to
100% LFL methane. This configuration can be changed
to other gases in the field by changing the setting on the
rotary gas selection switch, which is located on the
electronics module, and calibrating the device with the
new standard gas selected.
PointWatch has a good response to hydrocarbon gases
and to the vapors of hydrocarbon liquids. However, the
response varies depending on the structure of the
hydrocarbon molecule (see Figure 8). The raw
response of PointWatch is linearized to provide a 0 to
100% LFL output for five standard gases: methane,
ethane, propane/butane, ethylene, propylene.
Changing Linearized Output Gas Selection
IMPORTANT
Remove power before removing and disassem-
bling the PointWatch detector.
1. Loosen the two captive screws on the flat end of the
detector and slide the filter assemblies off. For the
aluminum model, use a standard screwdriver. For
the stainless steel model, use a 7/64 inch hex driv-
er. See Figure 9 (aluminum) or Figure 10 (stainless
steel).
2. Unscrew and remove the electronics mounting
cover by rotating it counter-clockwise. See Figure
11.
3. Slide the electronics mounting cover back to the
base of the mirror assembly and pull the IR module
out of the base as shown in Figure 12.
6
Figure 8—PointWatch Gas Absorption Curves
A1754
60
40
20
00 30 60 90
GAS CONCENTRATION (% LEL) 120
ABSORPTION (%)
PROPYLENE
ETHYLENE
PROPANE
ETHANE
METHANE
Table 2—Mounting Orientation
Model Installation Environment Orientation
Aluminum Heavy rain or hose down Vertical
Blowing dust or sand Horizontal
Stainless Steel All applications Horizontal

4. Using a small screwdriver, rotate the gas selection
switch from position 0 (methane) to the desired
position. Refer to Figure 13. Ensure that the tip of
the arrow on the switch lines up with the position
selected.
5. The module is “keyed” using different sized pins on
the bottom of the module. Slide the IR module into
the base and rotate it until the keyed holes are
aligned, then press securely into place.
NOTE
This assembly fits correctly only in one orientation.
If it is not seating into place, rotate it 180°and try
again.
6. Screw the electronics mounting cover clockwise
onto the base assembly as shown in Figure 11.
7. For the aluminum model, slide the outer filter
assembly over the mirror assembly. The outer filter
should be oriented with the solid portion toward the
base of the unit. If it is not oriented correctly, the fil-
ter assembly will not slide onto the unit. Slide the
inner filter assembly into the outer filter assembly
and rotate until it is seated securely, then fasten the
two captive screws using a standard screwdriver.
See Figure 9.
For the stainless steel model, slide the stainless
steel collar onto the base assembly, then slide the
baffle onto the unit. Place the end cap on the baffle
and rotate it until it is seated securely, then fasten
the two captive screws using a 7/64 inch hex driver.
See Figure 10.
8. Calibrate the detector with 50% LFL of the gas that
matches the calibration gas switch position follow-
ing the instructions in the “Calibration” section of
this manual.
JUNCTION BOXES
The PointWatch detector is designed to be threaded
into a junction box, which can be mounted to a solid,
vibration free wall or post. A 3/8 inch spacer may be
required between the enclosure and the mounting sur-
face to allow adequate room for the sensor and calibra-
tion accessory.
Intrusive and Non-Intrusive Calibration
For hazardous locations, it is important to consider the
options for calibration of PointWatch. The device can
be installed so that calibration can be performed by one
person without opening the explosion-proof enclosure
(non-intrusive calibration). This is accomplished by
incorporating a display or LED that provides information
BASE ASSEMBLY
ELECTRONICS MOUNTING COVER
HYDROPHOBIC SCREEN (ALUMINUM MODEL)
REFLECTOR TUBES (INSIDE)
MIRROR ASSEMBLY
CAPTIVE SCREWS (2)
A1741
STAINLESS STEEL COLLAR
BAFFLE
END CAP
CAPTIVE HEX SCREWS (2) A1739
OUTER FILTER ASSEMBLY
INNER FILTER ASSEMBLY
CAPTIVE SCREWS (2)
A1738
7 95-8440
Figure 10—Stainless Steel PointWatch Disassembly
Figure 9—Aluminum PointWatch Disassembly
Figure 11—IR Module and Base Assemblies
ELECTRONICS MOUNTING COVER
IR MODULE BASE A1742
Figure 12—IR Module Removal
ACCESS TO GAS SELECTION SWITCH
GAS SELECTION SWITCH
0 = METHANE (FACTORY SETTING)
1 = ETHANE
2 = PROPANE
3 = ETHYLENE
4 = PROPYLENE
A1740
2
4
6
0
3
5
7
1
Figure 13—Gas Selection Switch Location
at the Bottom of the Electronics Assembly

and/or instructions for calibration. When a display is not
used or the LED is not visible from the outside, the
enclosure must be opened to observe the LED or to
insert a meter to read the output of the device (intrusive
calibration). With this type of installation, either a permit
must be obtained to open the enclosure or the proce-
dure must be accomplished by two people using walkie
talkies for communication.
Depending on the control devices selected, PointWatch
can be installed for either intrusive or non-intrusive cali-
bration. See Table 3 for a listing of the installation
options.
A user-supplied junction box can also be used, provid-
ed it has the appropriate sized entries. This junction
box must be suitable for use in the application and loca-
tion in which it is being installed. Calibration is initiated
by touching the calibration lead to the negative lead
(common) of the power supply. Although this can be
accomplished manually, installation of a switch is rec-
ommended. It is recommended that this switch be a
momentary contact type to prevent it from inadvertently
being left in the calibrate position.
GENERAL WIRING REQUIREMENTS
NOTE
The wiring procedures in this manual are intended
to ensure proper functioning of the device under
normal conditions. However, because of the many
variations in wiring codes and regulations, total
compliance to these ordinances cannot be guaran-
teed. Be certain that all wiring complies with appli-
cable regulations relating to the installation of elec-
trical equipment in a hazardous area. If in doubt,
consult the authority having jurisdiction before
wiring the system.
The use of shielded cable in conduit or shielded
armored cable is recommended for optimum RFI/EMI
protection. In applications where the wiring cable is
installed in conduit, the conduit must not be used for
wiring to other electrical equipment. To assure proper
operation of the detector, the resistance of the connect-
ing wire must be within the specified limits. The maxi-
mum distance between the detector and power source
is determined by the power supply capability and wire
size. See Figure 2 to determine the proper wire size
and maximum wiring distance allowed.
It is important that moisture not be allowed to come in
contact with the electrical connections of the system.
The use of proper piping techniques, breathers, glands,
and seals are required to prevent water ingress and/or
maintain the explosion-proof rating.
DETECTOR WIRING PROCEDURE
IMPORTANT
Do not apply power until the wiring procedure is
complete and has been verified.
1. Determine the best mounting location for the detec-
tor (refer to the “Detector Location” section above).
If it is determined that sensor separation is required,
see the following section for details.
2. The junction box should be electrically connected
to earth ground.
3. Figures 14 through 18 show typical wiring for vari-
ous system configurations using the PointWatch
detector. Refer to the appropriate figure as a guide
to system connection. Figure 14 shows typical
wiring for standalone operation. Figure 15 shows
typical wiring for PointWatch with Det-Tronics sup-
plied junction box. Figure 16 shows the junction box
terminals and calibration switch. Figure 17 shows
typical wiring for PointWatch/Infiniti transmitter oper-
ation. Figure 18 shows typical wiring for
PointWatch/Eagle communication module configura-
tion. The PointWatch wiring color code is:
Red lead = +24 volts dc
Black lead = – (common)
White lead = 4 to 20 ma signal output
Yellow lead* = Calibration input
Green lead = Chassis ground
*If the calibration wire (yellow lead) is not
being used, do not connect this wire to
ground. Trim excess length and insulate
wire so no shorting can occur.
4. Check the detector wiring to ensure proper connec-
tions, then pour the conduit seals and allow them to
dry (if conduit is being used).
DETECTOR SEPARATION (OPTIONAL)
In applications where the detector must be installed in a
different location from the control device, a junction box
must be installed at the detector location to make the
8
Table 3—
Installation Options for Intrusive and Non-Intrusive Calibration
Control Device Non-Intrusive Intrusive or
& 1 person 2 person
Infiniti Transmitter X
PointWatch Junction Box X
w/ tall cover/window
PointWatch Junction Box X
w/ short cover/no window
Eagle 2000 DCU X
Eagle 2000 Communication Module X

electrical connection. The control device can be either
the Infiniti Transmitter or the tall cover junction box with
window. Refer to Figure 19 for a typical separation dia-
gram. For purposes of brevity the following discussion
only refers to the Infiniti Transmitter as the control
device.
By connecting a length of tubing (1/4 inch O.D.) from
the direct inject calibration nozzle back to the control
device location, the operator can accomplish calibration
from the remote location.
Wiring Requirements for Detector Separation
Shielded four wire cable is recommended for connect-
ing the detector junction box to the transmitter. Cable
with a foil shield is recommended. The shield of the
cable should be open at the detector junction box and
connected to earth ground at the transmitter junction
box. Ensure that the shield wire is clipped short and
insulated with electrical tape to prevent accidental
grounding at the open end.
The maximum distance between the detector junction
box and the transmitter is limited by the resistance of
the connecting wiring, which is a function of the gauge
of the wire being used. Refer to Figure 2 to determine
the maximum separation distance for a given wire size.
NOTE
It is important to maintain a minimum of +18 volts
dc (including ripple) at the PointWatch detector.
When determining the appropriate wire size for the
installation, refer to Figure 2. Be sure to take into
account the distance from the power supply to the
PointWatch or to the Infiniti and then to the
PointWatch to ensure that the power requirements
are met.
Mounting and Connecting Procedure
for Detector Separation
The PointWatch junction box can be mounted to a wall
or post, or it can be suspended by the conduit if this
does not result in excessive vibration. A 3/8 inch spac-
er may be needed between the junction box and the
mounting surface to allow adequate room for the sensor
and calibration accessory. The junction box should be
electrically connected to earth ground.
1. Lubricate the sensor threads with low vapor pres-
sure silicone grease, then install the sensor in the
conduit entry of the junction box. It should be tight
to ensure an explosion-proof installation, however,
do not overtighten.
2. Connect the detector wires to the terminal strip in
the junction box as shown in Figure 20.
9 95-8440
Figure 14—Typical PointWatch Wiring, Standalone Configuration
–
RED
BLACK
WHITE
YELLOW
GREEN
4 TO 20 MILLIAMPERES
POINTWATCH DETECTOR
+
A1755
NOTE: 
CALIBRATION PUSHBUTT0N, CURRENT METER AND POWER SUPPLY ARE NOT SUPPLIED.
+24 VDC
POWER SUPPLY
–
+
CALIBRATE
Figure 15—Typical PointWatch Wiring,
PointWatch with Det-Tronics Junction Box
+24 VDC POWER OUT
4 TO 20 MILLIAMPERES IN
POINTWATCH
DETECTOR
DET-TRONICS JUNCTION BOX
–
+
A1756
RED
BLACK
WHITE
YELLOW
GREEN
SPARE
CAL
4 – 20
RET
+24
CHASSIS
CAL
4 – 20
RET
+24
Figure 16—Junction Box Terminals and Calibration Switch
CAL SWITCH
A1743
HOLD CAL MAGNET
AT OUTSIDE BASE OF J-BOX 
IN THIS LOCATION
TO ACTIVATE CAL SWITCH

3. Connect the cable leadwires from the Infiniti or junc-
tion box to the same terminals inside the separated
junction box. Do not ground the shield at the junc-
tion box. Ground the sensor wire shield at the
transmitter end only.
4. Check the connections inside the junction box and
place the cover on the junction box.
5. If used with the Infiniti Transmitter, mount and wire
the Infiniti Transmitter as shown in Figure 20 and as
described in the Infiniti Instruction Manual.
STARTUP PROCEDURE
1. Inhibit the output loads that are actuated by the sys-
tem to prevent activation of these devices.
2. Check that the detector has been wired properly.
3. Apply power to the system and allow the detector to
operate for a minimum of 2 hours, then check zero
and verify gas response. Perform a zero and span
calibration, if necessary.
NOTE
If the device is being used with a gas other than
methane, it must be calibrated with 50% LFL of the
gas selected with the calibration switch.
4. Place the system in normal operation by reactivat-
ing the output loads.
CALIBRATION
The PointWatch detector is factory calibrated for
methane and, unlike catalytic detectors, does not
require routine calibration to ensure proper operation.
Guidelines for when calibration should be performed or
checked are listed in Table 4.
NOTE
To check calibration, inhibit output loads as neces-
sary, then apply 50% LFL calibration gas to the
detector using the equipment provided in the cali-
bration kit. Ensure that the correct calibration gas
is used. Check the current output for the appropri-
ate response (12 milliamperes).
NOTE
Drift will be indicated by a constant zero offset in
one direction either above or below 4 milliamperes.
The presence of background gas would be indicat-
ed by a small but constantly changing output.
CALIBRATION EQUIPMENT
The following equipment is required to calibrate the
PointWatch detector (calibration kits from Det-Tronics
contain all items below):
— 50% LFL calibration gas
— Calibration nozzle (for aluminum model)
— Wind shield (for calibration in high wind situations)
— Regulator (minimum 2.5 liter/minute flow rate)
— Three feet of tubing.
10
Figure 17—Typical PointWatch Wiring
with Det-Tronics Infiniti Transmitter
+24 VDC
POWER SUPPLY
4 TO 20 MILLIAMPERES
INFINITI TRANSMITTER
+
+
–
–
POWER OUT
NO COM NC NO COM NC NO COM
AUX RELAY LOW RELAY HIGH RELAY
NC
NO COM NC S – +
S– –+ +
RESET
CAL
FAULT RELAY POWER PW
IN
A1735
RED
BLACK
WHITE
YELLOW
GREEN
POINTWATCH DETECTOR
Figure 18—Typical PointWatch Wiring
with Eagle Communication Module
+24 VDC
POINTWATCH DETECTOR
JUNCTION BOX GROUND SCREW
EAGLE COMMUNICATION MODULE
A1736
RED
BLACK
WHITE
YELLOW
GREEN
1
2
3
4
5
6
7
8
9 RELAY COM
18
17
16
15
14
13
12
11
10
+
–
4 – 20 MA IN
DIGITAL IN2
POWER GND
RELAY NO
JUNCTION BOX
POINTWATCH
DETECTOR
SUITABLE WIRING.
MUST MEET ALL LOCAL CODES.
CONTROL DEVICE SUCH AS INFINITI TRANSMITTER
OR TALL COVER JUNCTION BOX WITH WINDOW
A1757
Figure 19—Options for Detector Separation

CALIBRATION PROCEDURES
The procedures in this section explain calibration
sequences for both standalone PointWatch applications
(when a user supplied or no J-box is used) and for
applications where PointWatch is used with the Det-
Tronics supplied J-box (containing a magnetic reed
switch and LED). For applications where the
PointWatch detector is used with the Infiniti Transmitter
or the Eagle System, refer to those instruction manuals
for the calibration procedure.
When PointWatch is used as a standalone unit or with
transmitters or controllers other than those supplied by
Det-Tronics, the current loop output must be monitored
in order to calibrate (for both inhibited and live current
loop configurations).
When PointWatch is used with a Det-Tronics J-Box, the
magnetic switch and LED in the J-box are used to initi-
ate and annunciate the calibration sequence. The cur-
rent loop output also indicates the calibration sequence
(for both inhibited and live current loop configurations).
IMPORTANT CALIBRATION NOTES
WARNING
• Ensure that the detector has been operating for at
least two hours before calibrating.
• Do not open the explosion-proof enclosure when
power is applied to the system unless the appropri-
ate permits have been procured.
• The calibration gas used must be the same as
the gas selected on the Gas Selection Switch. The
factory setting is for methane, so use methane to
calibrate if the Gas Selection Switch is set in posi-
tion “0.” If the Gas Selection Switch is set in any
other position, ensure that the correct gas is used
to calibrate. See Figure 13. Only 50% LFL cali-
bration gas can be used to calibrate the
PointWatch detector.
• If the PointWatch is being used in a standalone
configuration, the use of an inhibited current loop is
recommended. Live current loop calibration was
designed primarily for use with the Infiniti
+24 VDC
POWER SUPPLY
4 TO 20 MILLIAMPERES
POINTWATCH
DETECTOR
INFINITI TRANSMITTER
DET-TRONICS JUNCTION BOX
CHASSIS
+
+
–
–
POWER OUT
NO COM NC NO COM NC NO COM
AUX RELAY LOW RELAY HIGH RELAY
NC
NO COM NC S – +
S– –+ +
RESET
CAL
FAULT RELAY POWER PW
IN
A1737
RED
BLACK
WHITE
YELLOW
GREEN
SPARE
CAL
4 – 20
RET
+24
CHASSIS
CAL
4 – 20
RET
+24
11 95-8440
Table 4—Calibrate or Check
Function Calibrate Check
Startup X
Gas selection switch changed X
Non-standard gas X
(using linearization other than methane)
Replace any part X
Constant zero offset X
Periodic Functional Testing X
(at least once a year)
Figure 20—Sensor Separation with Infiniti Transmitter and PointWatch

Transmitter or the Eagle 2000 system.
Accomplishing live current loop calibration manual-
ly is possible but not recommended. Instructions
for live current loop calibration are provided after
the “Calibration Procedure - Inhibited Current
Output During Calibration” procedure.
• The calibration sequence is initiated by momen-
tarily connecting the calibration lead to the nega-
tive lead (common) of the power supply using the
Cal Magnet or an external switch. If the Det-
Tronics J-box with magnetic Cal Switch is being
used, this is accomplished by holding the Cal
Magnet near the side of the J-box for one second.
The location of the Cal Switch is shown in Figure
16. An alternate way of accomplishing this is to
install a pushbutton switch between the yellow lead
and the power supply common (–), as shown in
Figure 14. Use of the Cal Magnet to activate the
Cal Switch in the J-box will be referred to through-
out the following procedures. If an alternate
method of initiating calibration is used, substitute
that method in all places in which the Cal
Magnet/Cal Switch activation are referenced.
• The calibration sequence can be exited at any
time during the span calibration by holding the Cal
Magnet near the Cal Switch in the J-box for one
second.
• At all times other than when calibration is being
performed, all calibration ports must be capped.
For aluminum models, the allen head plug must be
installed in the calibration port or the calibration
nozzle must be capped. For stainless steel mod-
els, the calibration ports must be capped. This
prevents dirt and water from entering the direct
path into the optics. Failure to protect the optics
can result in a fouled optics fault. If a permanent
gas delivery system is used, the delivery tube must
be plugged when not in use.
Calibration Procedure -
Inhibited Current Output During Calibration
See Table 5 for an overview of the calibration sequence.
1. Be sure that only clean air is present at the sensor.
(The microprocessor begins taking zero readings
immediately upon entering the Calibrate mode.) If
the possibility of background gases exists, purge
the sensor with clean air to ensure accurate calibra-
tion.
2. There are two methods of applying the calibration
gas. For windy situations, a calibration wind shield
is supplied in the calibration kit and can be slipped
over the sensor to capture the calibration gas for
accurate readings. Once in place, tighten the vel-
cro strap and connect the flexible tubing to the noz-
zle on the wind shield. Otherwise, calibration gas
can be applied directly to the sensor through the
calibration nozzle. For aluminum models, remove
the allen head plug (shown in Figure 21) from the
calibration port on the end of the detector and
replace it with the calibration nozzle.
3. Initiate calibration by either momentarily activating
the Calibrate pushbutton shown in Figure 14 or by
holding the Cal Magnet near the Cal Switch in the J-
box (if used) for one second.
— The LED will go on steady (if used).
— The current output will drop to 2.2 milliamperes.
4. Wait for the zero calibration point to stabilize (typi-
cally 1 minute).
After successful zero calibration:
— The LED will begin flashing (if used),
— The current will drop to 2.0 milliamperes.
Proceed to step 5.
12
Description Current LED Operator Action
Normal operation/no gas present 4.0 ma Off If the possibility of background gases exists, purge the
sensor with clean air to ensure accurate calibration.
Initiate calibration 2.2 ma On steady Use calibration magnet, calibrate pushbutton or manually
connect cal lead to power supply common for one second.
Zero calibration complete 2.0 ma Flashing Apply 50% LFL calibration gas.
Span calibration complete * 1.8 ma Off Shut off and remove calibration gas and cap the calibration
nozzle (or replace it with the allen head plug).
Calibration fault indication 1.6 ma Off See Troubleshooting Table 6.
*Span calibration can be aborted by using the calibration magnet, the calibrate pushbutton or manually connecting the cal
lead to power supply common for one second. The device will revert to live operation using data from the last calibration.
Table 5—Calibration Sequence, Inhibited Current Output

If zero calibration fails:
— The LED will turn off,
— The current output will drop to 1.6 milliamperes.
Reset the detector by cycling power to the detector
or by holding the Cal Magnet near the Cal Switch in
the J-box (if used) for one second. Begin calibra-
tion again at step 1.
5. Connect the calibration gas canister, valve and tub-
ing to the direct input nozzle as shown in either
Figure 22 (aluminum model) or Figure 23 (stainless
steel model) or to the windshield nozzle, depending
on the method used.
6. Apply 50% LFL calibration gas to the detector. This
is accomplished by opening the valve on the cali-
bration gas canister (see Figure 22 or Figure 23). A
2.5 liter per minute flow rate is recommended.
— The LED will continue flashing (if used).
—The current will remain at 2.0 milliamperes as
the gas concentration increases.
Proceed to step 7.
7. The detector will automatically accept the span cali-
bration when the detected gas level is stable (typi-
cally 1 to 2 minutes).
After successful span calibration:
— The LED will turn off (if used),
— The current will drop to 1.8 milliamperes.
Proceed to step 8.
If for any reason a successful calibration is not
accomplished within 10 minutes, a calibration fault
will occur:
— The LED will turn off,
— the current output will drop to 1.6 milliamperes.
Turn off the gas, then reset the detector by cycling
power to the detector or by holding the Cal Magnet
near the Cal Switch (if used). Begin calibration
again at step 1.
8. After successful calibration, close the valve on the
calibration gas canister, remove the flexible tube
from the calibration nozzle and replace the allen
head plug (aluminum model) or use the nozzle cap
CAL PORT
A1744
13 95-8440
Figure 21—Aluminum PointWatch Detector Calibration Port
Figure 22—Aluminum PointWatch Detector
Calibration Configuration
JUNCTION BOX
FLEXIBLE TUBING
CAL MAGNET
POINTWATCH DETECTOR
A1745 CALIBRATION NOZZLE
VALVE
CALIBRATION GAS CANISTER
Figure 23—Stainless Steel PointWatch Detector
Calibration Configuration
JUNCTION BOX
FLEXIBLE TUBING
POINTWATCH DETECTOR
A1746
CALIBRATION PORTS
(USE EITHER PORT
FOR CALIBRATION)
VALVE
CALIBRATION GAS CYLINDER

specified in the Spare Parts section to cap the noz-
zle. If the calibration wind shield was used, remove
it from the PointWatch. The detector will return to
normal operation after the gas level has returned
below 5% LFL.
IMPORTANT
For aluminum models, the allen head plug must be
installed in the calibration port or the calibration
nozzle must be capped. For stainless steel mod-
els, the calibration ports must be capped. This
prevents dirt and water from entering the direct
path into the optics. Failure to protect the optics
can result in a fouled optics fault. If a permanent
gas delivery system is used, the delivery tube must
be plugged when not in use.
Calibration Procedure - Live Current Output During
Calibration
Sequence Summary: During calibration with a live cur-
rent loop output, the current output drops to 2.2 mil-
liamperes during the zero calibration then rises to reflect
the actual gas level for the span calibration. At the end
of calibration, the current level locks to indicate that the
calibration is complete. These current levels and their
significance are summarized below.
4.0 ma Zero gas level (0% LFL), initial state - normal
operation, no gas present
2.2 ma Zero calibration in progress
12.0 ma Span calibration lock-in
1.6 ma Calibration fault - reset unit
IMPORTANT
LIVE CURRENT OUTPUT CALIBRATION NOTES
• If the PointWatch is being used in a standalone
configuration, the use of an inactive current loop is
recommended. Live current loop calibration was
designed primarily for use with the Infiniti
Transmitter or the Eagle 2000 system.
Accomplishing live current loop calibration manual-
ly is difficult because precision timing is required.
• Inhibit alarm outputs before performing this cali-
bration procedure. Alarm levels will be exceeded
using the live current output calibration procedure.
• All calibration notes listed at the beginning of the
“Calibration Procedures” section also apply to this
procedure. Review those notes prior to proceeding.
1. Be sure that only clean air is present at the sensor.
(The microprocessor begins taking zero readings
immediately upon entering the Calibrate mode.) If
the possibility of background gases exists, purge
the sensor with clean air to ensure accurate calibra-
tion.
2. There are two methods of applying the calibration
gas. For windy situations, a calibration wind shield
is supplied in the calibration kit and can be slipped
over the sensor to capture the calibration gas for
accurate readings. Once in place, tighten the vel-
cro strap. Otherwise, calibration gas can be
applied directly to the sensor through the calibra-
tion nozzle. For aluminum models, remove the allen
head plug (shown in Figure 21) from the calibration
port on the end of the detector and replace it with
the calibration nozzle.
3. Initiate calibration by either momentarily activating
the Calibrate pushbutton shown in Figure 14 or by
holding the Cal Magnet near the Cal Switch in the J-
box (if used) for one second.
—The LED will go on steady and the current out-
put will drop to 2.2 milliamperes. After the zero
is stable (typically 1 minute), the LED will start
to flash and the current level changes to 2.0
milliamperes. When the LED goes off for the
first flash, immediately reactivate the calibra-
tion switch for one second only. This places
the current loop output in the live mode.
—The current level rises to 4.0 milliamperes and
the LED begins flashing.
If unsuccessful at entering live calibration mode,
abort calibration by momentarily reactivating the
magnetic calibration switch or pressing the cali-
brate pushbutton. Repeat steps 1 - 3.
Proceed to step 4.
If calibration mode was inadvertently exited:
— The LED will turn off,
—the current output will remain at 4.0 mil-
liamperes (normal operation).
This occurs when the Cal magnet or cal switch is
activated for too long when the LED begins flash-
ing. Repeat all of step 3 and proceed.
If zero calibration fails:
— The LED will turn off,
— the current output will drop to 1.6 milliamperes.
Reset the detector by cycling power to the detector
or by holding the Cal Magnet near the Cal Switch in
the J-box (if used) for one second. Begin calibra-
tion again at step 1.
4. Connect the calibration gas canister, valve and tub-
ing to the direct input nozzle as shown in either
Figure 22 (aluminum model) or Figure 23 (stainless
steel model) or to the windshield nozzle, depending
on the method used.
14

5. Apply 50% LFL calibration gas to the detector. This
is accomplished by opening the valve on the cali-
bration gas canister (see Figure 22 or Figure 23). A
2.5 liter per minute flow rate is recommended.
— The LED will continue flashing.
—The current output will increase proportionally
as the gas concentration increases.
Proceed to step 6.
6. The detector will automatically accept the span cali-
bration when the detected gas level is stable (typi-
cally 1 to 2 minutes).
After successful span calibration:
— The LED will turn off steady,
—the current will lock in steadily at 12.0 mil-
liamperes, indicating a successful span calibra-
tion.
Proceed to step 7.
If for any reason a successful calibration is not
accomplished within 10 minutes, a calibration fault
will occur:
— The LED will turn off,
— the current output will drop to 1.6 milliamperes.
Turn off the gas, then reset the detector by cycling
power to the detector or by holding the Cal Magnet
near the Cal Switch. Begin the calibration
sequence again at step 1.
7. After successful calibration, close the valve on the
calibration gas canister, remove the flexible tube
from the calibration nozzle and replace the allen
head plug (aluminum model) or use the nozzle cap
specified in the Spare Parts section to cap the noz-
zle. If the calibration wind shield was used, remove
it from the PointWatch. After the detector output
falls below 45% LFL, the current loop will unlock
and will track the declining gas concentration back
to 4 milliamperes.
IMPORTANT
For aluminum models, the allen head plug must be
installed in the calibration port or the calibration
nozzle must be capped. For the stainless steel
models, the calibration ports must be capped. This
prevents dirt and water from entering the direct
path into the optics. Failure to protect the optics
can result in a fouled optics fault. If a permanent
gas delivery system is used, the delivery tube must
be plugged when not in use.
TROUBLESHOOTING
Use Table 6 to isolate and correct malfunctions with the
PointWatch Detector.
MAINTENANCE
It is recommended to have spare IR Modules on hand
(see “Spare Parts” section). Use Table 6 to isolate and
correct malfunctions.
15 95-8440
Current Level Status Corrective Action
2.4 to 3.9 ma Negative Zero Indication
NOTE: This fault can be caused by the presence of background gas
(–10% LFL) during calibration. Ensure that background gas is not present and
recalibrate the unit. If fault does not clear, perform disassembly and
cleaning procedure, then recalibrate. If fault still does not clear,
replace electronics assembly.
1.6 ma Calibration fault Make sure that the calibration gas being used matches the Gas
Selection Switch setting. If these match and the fault is still present,
perform disassembly and cleaning procedure, then recalibrate.
1.0 ma Fouled optics Perform disassembly and cleaning procedure, then recalibrate.
0.8 ma +24 vdc line low (less than +17.5 vdc) Ensure that input voltage is correct and that power connections are
good. If fault does not clear, replace the electronics assembly.
0.6 ma Calibrate input active at power-up Ensure that calibration line is not shorted and that the calibration
switch is open. If fault does not clear, replace the unit.
0.4 ma Active channel fault Replace electronics assembly.
0.2 ma Reference channel fault Replace electronics assembly.
0.0 ma CPU system fault, warmup Ensure that power is applied and that the warmup period is complete
(1 minute). If fault does not clear, replace the unit.
Table 6—Troubleshooting Table

IMPORTANT MAINTENANCE NOTES
• Hydrocarbon-based grease will emit hydrocarbon
vapors, which will be measured by PointWatch and
will cause inaccurate gas level readings. Use only
silicone grease (not hydrocarbon-based
grease) when lubricating threads on the
PointWatch detector and associated junction
box. A suitable grease is listed in the “Spare
Parts” section at the end of this manual.
• In applications where both PointWatch and cat-
alytic type sensors are used, ensure that the sili-
cone grease used to lubricate the PointWatch
detector threads does not come into contact with
the catalytic sensors or poisoning of the catalytic
sensors will result. It is strongly recommended that
maintenance personnel wash their hands between
handling the two types of sensors.
• It is recommended that spare IR modules be
stocked (See “Spare Parts” section) for ease and
speed of replacement when conditions warrant it.
If cleaning is indicated (fouled optics), the proce-
dure is most easily performed on a bench.
DISASSEMBLY AND CLEANING PROCEDURE
Cleaning of the optical surfaces is required only if an
optical fault is indicated (1.0 milliampere current out-
put). This procedure is most easily accomplished on a
bench.
Required materials: Clean, flat work surface, cotton
swabs, isopropyl alcohol or circuit cleaner.
IMPORTANT
Remove power before disconnecting and removing
the PointWatch detector for maintenance.
1. Disassemble the detector as shown in Figure 9 (alu-
minum) or Figure 10 (stainless steel). For aluminum
models, loosen the two captive screws on the flat
end of the detector using a standard screwdriver
and slide the filter assemblies off. For stainless
steel models, loosen the two captive screws on the
end cap using a 7/64 inch hex wrench, then slide
the baffle and stainless steel collar off.
2. Unscrew and remove the electronics mounting cover
by rotating it counter-clockwise. See Figure 11.
3. Slide the electronics mounting cover back to the
base of the mirror assembly and pull the IR module
out of the base as shown in Figure 12. Do not
grasp the hydrophobic screen (aluminum model
only) to pull the IR module from the base as this
may damage the screen. Once the IR module
assembly is pulled from the base, slide the elec-
tronics mounting cover back to the electronics
assembly as shown in Figure 24.
4. Loosen the two captive screws on top of the mirror
assembly (Figure11) and slide the mirror assembly,
hydrophobic screen (aluminum model only) and
reflector tubes away from the electronics assembly
and electronics mounting cover. See Figure 24 (alu-
minum model) and Figure 25 (stainless steel model).
5. Disassemble the mirror assembly, reflector tubes
and hydrophobic screen as shown in Figure 24 (alu-
minum model) and Figure 25 (stainless steel model).
Do not remove the electronics mounting cover.
6. Clean the inside of the mirrors (2), reflector tubes
(2), and the windows (2) using cotton swabs and
isopropyl alcohol or circuit cleaner.
7. Replace the two reflector tubes into the larger holes
in the mirror assembly and ensure that they are fully
seated. Make sure that the retaining ring that holds
the reflector tubes in place is centered on the tubes
and not blocking any holes.
16
Figure 24—Aluminum PointWatch Detector Disassembly for Cleaning
ELECTRONICS ASSEMBLY
ELECTRONICS MOUNTING COVER
HYDROPHOBIC SCREEN (ALUMINUM MODEL)
MOUNTING TUBES
MIRROR ASSEMBLY
A1747
WINDOWS
REFLECTOR TUBESMIRRORS

8. For the aluminum model, slide a new hydrophobic
screen over the two mounting tubes, being careful
not to fold or crumple the screen. It should be cen-
tered loosely around the two mounting tubes.
IMPORTANT
The hydrophobic screen in the aluminum model
should be replaced whenever the mirror assembly
and reflector tubes are cleaned or replaced or when
the screen appears fouled upon visual inspection.
9. For the aluminum model, carefully slide the
mirror/reflector tube assembly into the hydrophobic
screen and seat the reflector tubes securely into the
windows in the base. Again, be careful not to crum-
ple or fold the hydrophobic screen. For the stain-
less steel model, slide the reflector tubes into the
windows in the base.
10. Tighten the two captive screws on the top of the
mirror assembly. See Figure 9 (aluminum) or Figure
10 (stainless steel).
11. Slide the IR module into the base and rotate it until
the keyed holes are aligned, then press securely
into place. See Figure 13.
NOTE
This assembly fits correctly only in one orientation.
If it is not seating into place, rotate it 180°and try
again.
12. Screw the electronics mounting cover clockwise onto
the electronics assembly as shown in Figure 11.
13. For aluminum models, slide the outer filter assembly
over the mirror assembly. The outer filter should be
oriented with the solid portion toward the base of
the unit. If it is not oriented correctly, the filter
assembly will not slide onto the unit. Slide the inner
filter assembly into the outer filter assembly and
rotate until it is seated securely, then fasten the two
captive screws. See Figure 9.
For the stainless steel model, slide the stainless
steel collar onto the base assembly, then slide the
baffle onto the unit. Place the end cap on the baffle
and rotate it until it is seated securely, then fasten
the two captive screws using a 7/64 inch hex driver.
See Figure 10.
14. Calibrate the detector with 50% LFL of the gas that
matches the calibration gas switch position follow-
ing the instructions in the “Calibration” section of
this manual.
TO REPLACE THE IR MODULE
Perform steps 1 through 3 in the “Disassembly and
Cleaning Procedure” above to remove and replace the
IR Module. Perform steps 11 through 14 to replace the
IR module.
To Replace Base/Wire Assembly
1. Disconnect external PointWatch wiring.
2. Unscrew the base from its mounting (junction box,
Infiniti, or Eagle).
3. Install the new base by screwing it into the junction
box.
4. Connect the wires (refer to the “PointWatch Wiring”
section of this manual).
5. Reassemble the unit following the instructions in
steps 11 through 14 in the “Disassembly and
Cleaning Procedure” above.
17 95-8440
ELECTRONICS ASSEMBLY
RETAINER (MAY BE CENTERED ON REFLECTOR TUBES ON SOME MODELS)
MIRROR ASSEMBLY
MIRRORS
A1758
WINDOWS
REFLECTOR TUBES
ELECTRONICS MOUNTING COVER
Figure 25—Stainless Steel PointWatch Detector Disassembly for Cleaning

DEVICE REPAIR AND RETURN
The PIR9400 PointWatch IR Hydrocarbon Gas Detector
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 mechanical or electronic failure,
the device must be returned to the factory for repair.
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 malfunc-
tion must accompany the returned device or component
to expedite finding the cause of the failure, thereby
reducing the time and cost of the repair.
Return all equipment transportation prepaid to the
Minneapolis location.
OFFICE LOCATIONS
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Telephone [phone] or (800) 765-FIRE
Facsimile [phone]
www.detronics.com
E-mail: [email protected]
Cable Detronics
Telex 6879043 DETEL UW
Detector Electronics Corporation
13949 Williams Road
P. O. Box 1329
Glen Ellen, California 95442 USA
Telephone [phone]
Facsimile [phone]
Voice Mail Box Number 930
Detector Electronics Corporation
466 Conchester Highway
Aston, Pennsylvania 19014 USA
Telephone [phone]
Facsimile [phone]
Detector Electronics Corporation
11210 Steeplecrest Drive
Suite 104
Houston, Texas 77065 USA
Telephone [phone]
Facsimile [phone]
Detector Electronics (UK) Limited
Riverside Park, Poyle Road
Colnbrook
Slough, Berkshire
SL3 OHB
ENGLAND
Telephone [phone]
Telex 848124 GRAVIN G
Facsimile 01753 684540
Det-Tronics France
La Valette
Rue du Cimetiere
78790 Septeuil
FRANCE
Telephone [phone]
Facsimile 33 1 3497 0648
Det-Tronics Deutschland
Kidde Deugra GmbH
Postfach 1457
Harkortstrasse 3
D-4030 Ratingen 1
GERMANY
Telephone [phone]
Direct 49 2102 405152
Facsimile 49 2102 405151
Telex 8589029
Detector Electronics Italy
Fenwal Italia S.p.A.
Viale De Gasperi, 44
20010 Bareggio (Mi)
ITALY
Telephone [phone]
Facsimile (39) 2 90 36 16 27
Detector Electronics
108, Sai Prasad Complex
Opp. Khar Railway Station
Khar (W)
Bombay 400 052
INDIA
Telephone [phone]
Facsimile (91) 22 649 7775
Det-Tronics Benelux
Costerweg 5
NL-6702 AA Wageningen
THE NETHERLANDS
Telephone [phone]
Facsimile 31 (0)317 427308
18