RKI Instruments 35-3001A-08-01 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
35-3001A-08-XX
Sample-Draw Detector
Operator’s Manual
Part Number: 71-0630
Revision: P1
Released: 1/31/23

2• 35-3001A-08-XX Sample-Draw Detector Operator’s Manual
WARNING
Read and understand this instruction manual before operating
detector. Improper use of the detector could result in bodily harm or
death.
Periodic calibration and maintenance of the detector is essential for
proper operation and correct readings. Please calibrate and maintain
this detector regularly! Frequency of calibration depends upon the
type of use you have and the sensor types.
Typical calibration frequencies for most applications are between 3
and 6 months, but can be required more often or less often based on
your usage.

35-3001A-08-XX Sample-Draw Detector Operator’s Manual • 3
Product Warranty
RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year from date of shipment from
RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at
our option, free of charge. This warranty does not apply to those items which by their nature are
subject to deterioration or consumption in normal service, and which must be cleaned, repaired, or
replaced on a routine basis. Examples of such items are:
• Absorbent cartridges
•Fuses
• Pump diaphragms and valves
•Batteries
• Filter elements
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or repair
procedures not in accordance with the operator’s manual. This warranty indicates the full extent
of our liability, and we are not responsible for removal or replacement costs, local repair costs,
transportation costs, or contingent expenses incurred without our prior approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND
REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL OTHER OBLIGATIONS OR
LIABILITIES ON THE PART OF RKI INSTRUMENTS, INC. INCLUDING BUT NOT LIMITED TO,
THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE. INNO
EVENT SHALL RKI INSTRUMENTS, INC. BE LIABLE FOR INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF ITS
PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors, dealers, and
representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of this gas
monitor, and our warranty is limited to the replacement of parts or our complete goods.

4• 35-3001A-08-XX Sample-Draw Detector Operator’s Manual
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Internal Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Mounting the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Connecting the Sample Lines to the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . 16
Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Replacing Components of the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Adjusting the Low Flow Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Removing the Particle Filter’s Tubing Stub, if Necessary . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Calibration, IR Combustible Gas Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Calibration, CO Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

35-3001A-08-XX Sample-Draw Detector Operator’s Manual • 5
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

35-3001A-08-XX Sample-Draw Detector Operator’s Manual Overview • 6
Overview
This operator’s manual describes the 35-3001A-08-XX combustible gas/carbon monoxide
sample-draw detector. This manual also describes how to install, start up, maintain, and calibrate
the sample-draw detector when using it with a gas monitoring controller. A parts list at the end of
this manual lists replacement parts and accessories for the sample-draw detector.
Specifications
Table 1 lists specifications for the combustible gas/carbon monoxide sample-draw detector. See
the controller Operator’s Manual for information specific to the controller.
Table 1: Specifications
Target Gases and
Detection Range
Combustible Gas:
• 35-3001A-08-01: CH4, 0 - 100% LEL
• 35-3001A-08-02: General hydrocarbons (propane
calibration standard), 0 - 100% LEL
• 35-3001A-08-03: CH4, 0 - 100% volume
Carbon Monoxide: 0 - 300 ppm
Input Power 24 VDC Nominal (18.5 VDC - 30 VDC)
Construction (housing) Fiberglass/polyester (NEMA 4X)
Dimensions 8.5 in. H x 6.5 in. W x 4.25 in. D
Weight 4.5 lbs.
Sampling Method Sample-draw
Sample Flow 3.0 SCFH typical, with no inlet or exhaust line
Flow to Sensor 1.0 SCFH (nominal)
Low Flow Setpoint 0.6 ± 0.1 SCFH
Maximum
Recommended Inlet/
Exhaust Line Length
for 1/4” O.D. x 1/8” I.D.
Tubing
Inlet Exhaust
50 feet 0 feet
* RKI Instruments, Inc. does not recommend installing this
tubing size on both the inlet and exhaust.
Maximum
Recommended Inlet/
Exhaust Line Length
for 1/4” O.D. x 0.170”
I.D. Tubing
Inlet Exhaust
50 feet 50 feet
75 feet 0 feet

35-3001A-08-XX Sample-Draw Detector Specifications • 7
WARNING: When using the 35-3001A-08-XX, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 35-3001A-08-XX and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 35-3001A-08-XX as described in this manual.
Response Time 90% in 30 seconds
Accuracy
Combustible Gas:
± 5% of reading or ± 2% of full scale (whichever is greater)
Carbon Monoxide:
± 5% of reading or ± 5 ppm CO (whichever is greater)
Table 1: Specifications

8• Description 35-3001A-08-XX Sample-Draw Detector
Description
This section describes the components of the combustible gas/carbon monoxide sample-draw
detector.
Figure 1: Combustible Gas/Carbon Monoxide Sample-Draw Detector Component Location
CO Amplifier
CO Sensor
(inside block)
Oxygen
Sensor
Terminal
Strip
Pump Connector
B
_
W
+
W
LE L
G BR S
PWR /SIG
G B
IRFlow Block
IR Sensor
(inside block)
IR Sensor PCB
+
S+
AMP OX Y AMP 2
+S R
Fail LED
Pilot LED
Charcoal
Filter
G B
Pressure Switch
Adjustment Screw
(behind PCB)
Pump Reset
Switch
AMP 1
+
AMP 2
S S R
+
W G
OXY
+
Pump
ParticleFilter
Sensor Flow
Control Valve
O
X
Y
G
E
N
This End To
Inlet Fitting
Interconnect
Terminal
Strip
Flowmeter
Flowmeter Circuit
Board Connector
W
LEL / IR
W
LEL / IR
Inlet
Fitting
Exhaust
Fitting
3/4" Conduit Hub
CO Flow
Block
INLET
EXHAUST
IR Amplifier
Mounting Foot, 4X
Hydrophobic
Filter
Detector/Amp
Terminal Strip
(Factory Wired)

35-3001A-08-XX Sample-Draw Detector External Components • 9
External Components
This section describes the sample-draw detector’s external components.
Housing
The sample-draw detector’s fiberglass housing is weather- and corrosion-resistant. It is suitable
for installation where general purpose equipment is in use.
The housing door is hinged on the left side and is secured by two latches on the right side. The
flowmeter and status LEDs are visible through a window in the housing door.
Four mounting feet are attached to the back of the housing (one at each corner). Use the mounting
feet to install the housing to a vertical surface.
Sample Fittings
The sample fittings are located on the left side of the bottom of the housing. The inlet fitting is
near the front of the housing and the exhaust fitting is near the back of the housing. The sample
fittings accept 1/4 in. rigid tubing. See the Installation section on page 15 to connect tubing to the
sample fittings.
Particle Filter
A particle filter with a tubing stub on one end is shipped with the instrument but it is not factory
installed. If the particle filter is installed directly to the inlet fitting, the tubing stub must be used.
If the particle filter is installed somewhere else, like at the end of the inlet line, the tubing stub can
be used or removed.
Conduit Hub
One 3/4” conduit hub is located on the right side of the bottom of the housing. It is used for
routing wiring into the housing by using conduit or an appropriate cable bushing.

10 • Internal Components 35-3001A-08-XX Sample-Draw Detector
Internal Components
This section describes the sample-draw detector’s internal components (see Figure 1). Figure 2
illustrates how the gas sample moves through the flow system.
Figure 2: Combustible Gas/Carbon Monoxide Sample-Draw Detector Flow Diagram
Main Circuit Board
The main circuit board includes the detector/amp terminal strip, interconnect terminal strip,
oxygen sensor terminal strip, pump connector, and flowmeter circuit board connector (see Figure
1).
Detector/Amp Terminal Strip
The detector/amp terminal strip is the upper twelve-point terminal strip in the bottom right corner
of the main circuit board. Use the detector/amp terminal strip to connect the IR combustible gas
amplifier and the CO amplifier to the main circuit board.
NOTE: The IR combustible gas amplifier and CO amplifier are factory-wired to the main circuit
board. See the “Installation” section on page 15 for all wiring procedures related to the
sample-draw detector.
Interconnect Terminal Strip
The interconnect terminal strip is the lower twelve-point terminal strip in the bottom right corner
of the main circuit board. Use the interconnect terminal strip to connect the sample-draw detector
to a controller.
Restrictor
Pump
IR
Sensor
Carbon
Monoxide
Sensor
Flowmeter
Particle Filter
Sensor Flow
Control Valve
Flowmeter PCB
Exhaust Pressure Switch
Hydrophobic Filter
Inlet Charcoal
Filter

35-3001A-08-XX Sample-Draw Detector Internal Components • 11
Oxygen Sensor Terminal Strip
The oxygen sensor terminal strip is a two-point terminal strip in the upper right corner of the main
circuit board. This terminal strip is not used in this version of the sample-draw detector.
Pump Connector
The pump connector is the two-point connector below the oxygen terminal strip in the upper right
corner of the main circuit board. Use the pump connector to connect the pump to the main circuit
board.
NOTE: The pump is factory-wired to the main circuit board. See “Installation” on page 15 for
all wiring procedures related to the sample-draw detector.
Flowmeter Circuit Board Connector
The flowmeter circuit board connector is a six-position connector in the upper left corner of the
main circuit board. Use the flowmeter circuit board connector to connect the flowmeter circuit
board to the main circuit board.
NOTE: The flowmeter circuit board is factory wired to the main circuit board. See “Installation”
on page 15 for all wiring procedures related to the sample-draw detector.
Flowmeter Circuit Board
The flowmeter circuit board is mounted to the left side of the main circuit board using standoffs. It
includes the flowmeter, sensor flow control valve, status LEDs, pressure switch, and pump reset
switch.
Flowmeter
The flowmeter is mounted to the right side of the flowmeter circuit board. You can see it through
the window in the door. A ball in the flowmeter column indicates the flow rate to the sensor. The
flowmeter measures the flow in the range 0.2 to 2.0 SCFH (Standard Cubic Feet per Hour). The
optimum flow rate is 1.0 SCFH.
Sensor Flow Control Valve
The sensor flow control valve is mounted to the flowmeter circuit board above the flowmeter. The
sensor flow control valve adjusts the flow rate to the detector. Turn the valve’s knob clockwise to
increase the flow and counterclockwise to decrease the flow.
Status LEDs
Two status LEDs are above the flowmeter. They are also visible through the window in the
housing door. The green Pilot LED is on when the sample-draw detector is receiving power from
the controller. The red Fail LED is on when the sample flow rate is below the low flow level.

12 • Internal Components 35-3001A-08-XX Sample-Draw Detector
Pressure Switch
The pressure switch is mounted to the back of the flowmeter circuit board. The pressure switch
monitors the flow rate of the incoming gas sample.
If the flow rate falls below the preset low flow level, the pressure switch causes the Fail LED to
turn on and interrupts the signal from the detector. The interrupted detector signal causes a fail
condition at the controller. The low flow level is factory-set at 0.6 SCFH (±0.1 SCFH). See
“Adjusting the Low Flow Setting” on page 28 to adjust this setting.
Pump Reset Switch
The pump reset switch is located to the left of the status LEDs. When a low flow condition occurs,
the pump will be shut off. To reset the low flow condition and start the pump again, press and hold
the pump reset switch for about 2 seconds, then release.
Hydrophobic Filter
The hydrophobic filter is located toward the bottom left of the main circuit board. The filter
prevents particulates and water in the incoming gas sample from damaging the flow and detection
systems. Replace the filter when it appears dirty, discolored, or clogged.
Pump
The pump is mounted to the right side of the main circuit board. The pump pulls the gas sample
into the sample-draw detector. The pump operates on 24 VAC, which is generated from the 24
VDC supplied by the controller.
Charcoal Filter
A charcoal filter is located at the top of the main circuit board. It scrubs out interfering gases
which may cause the CO sensor to respond, such as H2S or certain hydrocarbons. Replace the
charcoal filter when false high CO readings are noticed, especially in the presence of H2S.
IR Sensor/IR Sensor PCB
The combustible gas sensor is an infrared type plug-in detector. It is installed in the IR flow block,
and the IR flow block is mounted to the middle of the main circuit board. It is the lower of the two
flow blocks mounted to the main circuit board. A small circuit board, the IR combustible gas
sensor PCB, with a 4-wire cable mates to the IR combustible gas sensor and retains it in the flow
block. The cable is wired to the IR combustible gas amplifier. The IR combustible gas sensor PCB
allows you to replace the sensor without disconnecting the wiring.

35-3001A-08-XX Sample-Draw Detector Internal Components • 13
IR Amplifier
The IR amplifier converts the electrical output from the IR sensor to a 4 to 20 mA signal that
corresponds to the detection range and transmits the signal to a gas monitoring controller. A label
on the amplifier indicates the detector drive current. This drive current is factory set. The
amplifier is mounted on the top middle edge of the main circuit board. It consists of the zero pot,
span pot, controller terminal strip, detector terminal strip, and test points.
Figure 3: IR Amplifier Component Location
Zero Pot
The zero pot is located in the upper right corner of the amplifier (see Figure 3). Use a small flat
blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s zero (fresh
air) output during the start-up and calibration procedures. Turn the adjustment screw clockwise to
increase the fresh air output and counterclockwise to decrease the fresh air output.
Span Pot
The span pot is located below the zero pot (see Figure 3). Use a small flat blade screwdriver to
turn the span pot’s adjustment screw and adjust the amplifier’s gas response output during the
calibration procedure. Turn the adjustment screw clockwise to increase the span output and
counterclockwise to decrease the span output.
CAUTION: The amplifier includes additional pots. They are factory-set. Do not adjust them.
Controller and Detector Terminal Strips
The controller terminal strip and detector terminal strip are three- and four-position plug-in style
terminal strips, respectively. The controller terminal strip is located on the right side of the
amplifier and the detector terminal strip is to the left of it. Both terminal strips are factory wired to
the sensor and main circuit board.
Factory Set Pots
Sensor
Current
148mA
WLELG BR
Test Points
100-500 mV Range Zero Pot
Detector
Terminal Strip
Span Pot
Controller
Terminal Strip
S
PWR / SIG

14 • Internal Components 35-3001A-08-XX Sample-Draw Detector
Test Points
The test points are on the left side of the amplifier (see Figure 3). The test points produce a 100
mV to 500 mV output that corresponds to the sample-draw detector’s 4 to 20 mA output. Use the
test points and a voltmeter to measure the amplifier’s output during the start-up and calibration
procedures. The black test point in the upper left corner is the negative (-) test point and the red
test point to the left of the zero and span pots is the positive (+) test point.
Carbon Monoxide Sensor/CO Amplifier
The carbon monoxide sensor is a plug-in sensor that plugs into the back of the CO amplifier. The
sensor and amplifier are retained in the flow block by two screws. The flow block is mounted to
the middle of the main circuit board. It is the higher of the two flow blocks mounted to the main
circuit board.
Through a series of chemical and electronic reactions, the CO sensor produces a millivolt output
that is proportional to the detection range of the sample-draw detector. A red wire and a blue wire
extend from the CO amplifier and allow connection to the detector/amp terminal strip.
Figure 4: CO Amplifier Component Location
Zero Pot
The zero pot is located in the lower right corner of the amplifier (see Figure 4). Use a small flat
blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s zero output
during the start up and calibration procedures. Turn the adjustment screw clockwise to increase
the zero output and counterclockwise to decrease the zero output.
Span Pot
The span pot is located to the left of the zero pot (see Figure 4). Use a small flat blade screwdriver
to turn the span pot’s adjustment screw and adjust the amplifier’s gas response during the
calibration procedure. Turn the adjustment screw clockwise to increase the span output and
counterclockwise to decrease the span output.
Test Points
The test points are on the top edge of the amplifier (see Figure 4). The test points produce a 100
mV to 500 mV output that corresponds to the sample-draw detector’s 4 to 20 mA output. Use the
test points and a voltmeter to measure the amplifier’s output during the start-up and calibration
procedures. The black test point (CAL 2) in the upper left corner is the negative (-) test point and
the red test point (CAL 1) in the upper right corner is the positive (+) test point.
Zero Pot
Span Pot
Test Points
100-500 mV Range

35-3001A-08-XX Sample-Draw Detector Installation • 15
Installation
This section describes procedures to mount the sample-draw detector in the monitoring
environment and wire the sample-draw detector to a controller.
Mounting the Sample-Draw Detector
1. Select the mounting site. Consider the following when you select the mounting site:
• Is there enough room to open the housing door and make wiring and tubing connections at
the bottom of the housing?
• Make sure there is sufficient room to perform start-up, maintenance, and calibration
procedures.
• Are the flowmeter and status LEDs visible?
Figure 5: Outline and Mounting Dimensions
Ø.30 x.50(4X) MOUNTING
.40
1.13
.78
.80
.85
Pilot Fail
Sample Drawing
Gas Detector
www.rkiinstruments.com
35-3001
6.50
4.00
8.88
NOTE: Housingis4.3 inches deep
4.50
8.50

16 • Installation 35-3001A-08-XX Sample-Draw Detector
2. Close and latch the housing door.
NOTE: The sample-draw detector is shipped with the mounting feet “tucked under”
the housing to protect the mounting feet during shipment.
3. Slightly loosen the screw that secures the mounting foot to the housing, then rotate the
mounting foot 180 degrees (see Figure 5).
4. Tighten the screw that secures the mounting foot to the housing.
5. Repeat steps 3 and 4 for the remaining three mounting feet.
6. Position the sample-draw housing on a vertical surface at eye level (4 1/2 to 5 feet from the
floor).
7. Insert 1/4 inch screws through the slots in the mounting feet to secure the housing to the
mounting surface.
Connecting the Sample Lines to the Sample-Draw
Detector
See Figure 7 for the fitting layout.
Installing the Inlet Line with Particle Filter Connected to the Inlet
Fitting
1. Loosen the nut on the inlet fitting until 3 threads are visible.
2. Push the particle filter’s tubing stub into the inlet fitting until it stops. Be sure the arrow on the
particle filter is pointing toward the inlet fitting.
3. Hand tighten the nut on the inlet fitting so the ferrules clamp on the tubing. If the tube nut is
removed, see Figure 7 for the arrangement of the fitting components.
4. Connect a length of sample tubing to the other side of the particle filter and route it to the
sampling area. 1/4” O.D. rigid polypropylene, Teflon, or flexible polyurethane tubing may be
used. RKI Instruments, Inc. recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x
0.170” I.D. tubing based on your length requirements. See “Specifications” on page 6 for
maximum tubing lengths based on tubing size.
CAUTION: If you use flexible sample tubing (polyurethane is acceptable), use an
appropriate insert if necessary to provide support to the tubing and
ensure a good seal when connecting to the flexible stub on the filter.
CAUTION: Avoid loops or slumps in the incoming sample line. To reduce response
time, keep the incoming sample line as short as possible.

35-3001A-08-XX Sample-Draw Detector Installation • 17
Installing the Inlet Line without Particle Filter Connected to the Inlet
Fitting
1. Loosen the nut on the inlet fitting until 3 threads are visible.
2. Push 1/4” O.D. rigid polypropylene or rigid Teflon sample tubing into the fitting until it stops.
Flexible polyurethane tubing may be used with an appropriate insert. RKI Instruments, Inc.
recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x 0.170” I.D. tubing based on
your length requirements. See “Specifications” on page 6 for maximum tubing lengths based
on tubing size.
CAUTION: If you use flexible sample tubing (polyurethane is acceptable), use an
appropriate insert to seal the connection between the tubing and the
inlet fitting.
3. Hand tighten the nut on the inlet fitting so the ferrules clamp on the tubing. If the tube nut is
removed, see Figure 7 for the arrangement of the fitting components.
4. Route tubing from the inlet fitting to the sample area. See “Specifications” on page 6 for
maximum tubing lengths based on tubing size.
CAUTION: Avoid loops or slumps in the incoming sample line. To reduce response
time, keep the incoming sample line as short as possible.
5. If desired, install the particle filter onto the end of the inlet line. Be sure the arrow on the
particle filter is pointed toward the inlet line.
Installing the Exhaust Line
1. Loosen the nut on the exhaust fitting until 3 threads are visible.
2. Push 1/4” O.D. rigid polypropylene or rigid Teflon sample tubing into the fitting until it stops.
Flexible polyurethane tubing may be used with an appropriate insert. RKI Instruments, Inc.
recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x 0.170” I.D. tubing based on
your length requirements. See “Specifications” on page 6 for maximum tubing lengths based
on tubing size.
CAUTION: If you use flexible sample tubing (polyurethane is acceptable), use an
appropriate insert to seal the connection between the tubing and the
inlet fitting.
3. Hand tighten the nut on the exhaust fitting so the ferrules clamp on the tubing. If the tube nut
is removed, see Figure 7 for the arrangement of the fitting components.
4. Route the opposite end of the tubing to an open area where the sample can safely disperse or
to an exhaust duct. See “Specifications” on page 6 for maximum tubing lengths based on
tubing size.

18 • Installation 35-3001A-08-XX Sample-Draw Detector
Wiring the Sample-Draw Detector to a Controller
WARNING: Always verify that the controller is off and that power to the controller is off
before you make wiring connections.
1. Turn off the controller.
2. Turn off power to the controller.
3. Unlatch and open the housing door of the sample-draw detector.
4. Guide a five-conductor, shielded cable or five wires in conduit through the conduit hub at the
bottom of the sample-draw housing. A minimum of 18 AWG wire is recommended.
5. Connect the cable to the sample-draw detector’s interconnect terminal strip as shown in
Figure 6.
6. Close and latch the housing door of the sample-draw detector.
CAUTION: If using shielded cable, leave the cable shield’s drain wire insulated and
disconnected at the sample-draw detector. You will connect the opposite
end of the drain wire at the controller.
7. Route the cable or wires in conduit leading from the sample-draw detector through one of the
conduit hubs at the controller.
8. Connect the wires to the applicable detector/transmitter terminal strip at the controller as
shown in Figure 6. Refer to the controller operator’s manual and the controller detector head
specification sheet for the 35-3001A-08-XX for detector/terminal strip connections specific to
the controller.

35-3001A-08-XX Sample-Draw Detector Installation • 19
Figure 6: Wiring the Sample-Draw Detector to a Controller
9. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth) ground
at the controller. RKI controllers typically have a ground stud that can be used to ground the
cable’s drain wire.
Black
White
Red
Not Used on
ThisVersion
SPAN
ZE R O
Red (+)
Blue (S)
S
PWR/SIG
Green
Black
Red
LEL/IR
LEL/IR
AMP 2AMP 1
AMP 1AMP 2
PATS201PATS2 01
White
PATS101PATS1 01
CO
IR Sensor
OXY
OXY
- (DC Ground)
Controller or Recording Device
4/20 Signal
+ 24 VDC
4/20 Signal
+ 24 VDC
W
LEL
G BR
Sensor
Current
148mA
IR
IR Sensor
PCB

20 • Start Up 35-3001A-08-XX Sample-Draw Detector
Start Up
This section describes procedures to start up the sample-draw detector and place the sample-draw
detector into normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the wiring is correct and secure. Refer to the controller operator’s manual for
connections at the controller.
3. Turn on or plug in the power to the controller, then turn on the controller.
4. Verify that the sample-draw detector’s Pilot LED is on.
5. Verify that the controller is on and operating properly. Refer to the controller operator’s
manual.
NOTE: When first powered up, the sample-draw detector will enter about a one
minute period when the 4-20 mA output is stabilizing and may be above the
controller alarm points or well below zero momentarily. RKI controllers
have a one minute warmup period when the controller does not display any
gas reading or give any alarm indication. The CO2transmitter’s 4-20 mA
signal should be stable by the time the controller’s warmup period is over.
6. Verify that the flowmeter indicates a flow rate of approximately 1.0 SCFH. If necessary, use
the sensor flow control valve to adjust the flow rate. Turn the valve’s knob clockwise to
increase the flow and counterclockwise to decrease the flow.
NOTE: The following step tests for leaks in the sample line. This test will cause a
low flow condition at the sample-draw detector and a fail condition at the
controller. Be sure to put the controller into its calibration program or disable
external alarms before performing this test.
7. Verify that the incoming sample line is not leaking. To test the sample line, press and hold the
reset switch and plug the open end of the sample line with your thumb. If the flowmeter ball
drops to the bottom of the flowmeter, the incoming sample line is not leaking.
8. Remove your thumb from the sample line, release the reset switch, and verify the flowmeter
returns to a normal flow rate.
9. Enable alarms or place the controller in normal operation.
CAUTION: Allow the sample-draw detector to warm up for 5 minutes before you
continue with the next section, “Setting the Zero Reading.”