RKI Instruments 35-3001A-01 1 Series User manual

www.rkiinstruments.com
35-3001A-01-XX1
Sample-Draw Detector
Operator’s Manual
Part Number: 71-0585
Revision: P1
Released: 1/25/22

2 • 35-3001A-01-XX1 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. For most applications,
typical calibration frequencies are between 3 and 6 months but can be
more often or less often based on your usage.

35-3001A-01-XX1 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:
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 A PARTICULAR PURPOSE. IN NO 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.
a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses

4 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Internal Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Mounting the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Connecting the Sample Lines to the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . 14
Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Low Flow Contact Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Replacing Components of the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Adjusting the Low Flow Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Removing the Particle Filter’s Tubing Stub, if Necessary . . . . . . . . . . . . . . . . . . . . . . . . 25
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 5
Overview
This operator’s manual describes the 35-3001A-01-XX1 sample-draw detector. This version
of the sample-draw detector has low flow contacts that allow the user to monitor the detector’s
low flow status. 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 sample-draw detector. See the controller Operator’s Manual
for information specific to the controller.
Table 1:Specifications
Target Gas and Detection
Range
35-3001A-01-011
•Methane(CH
4): 0 - 100% LEL
35-3001A-01-021
• General hydrocarbons (calibrated to propane): 0 - 100% LEL
35-3001A-01-031
•Methane(CH
4): 0 - 100% volume
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
100 feet 0 feet
50 feet 50 feet

6 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
WARNING: When using the 35-3001A-01-XX1, you must follow the instructions and
warnings in this manual to assure proper and safe operation of the 35-3001A-
01-XX1 and to minimize the risk of personal injury. Be sure to maintain and
periodically calibrate the 35-3001A-01-XX1 as described in this manual.
Maximum Recommended
Inlet/Exhaust Line Length
for 1/4” O.D. x 0.170” I.D.
Tubing
Inlet Exhaust
100 feet 100 feet
Response Time 90% in 30 seconds
Accuracy ± 5% of reading or ± 2% of full scale (whichever is greater)
Table 1:Specifications

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 7
Description
This section describes the components of the sample-draw detector.
Figure 1: Sample-Draw Detector Component Location
Oxygen
Sensor
Terminal
Strip
Mounting
Foot, 4X
+
B
O
X
Y
G
E
N
_
IR Sensor
(inside block)
Pump
W
S
PWR /SIG
IR Sensor PCB
Detector/Amp
Terminal Strip
(Factory
Wired)+
S
AMP 2
AMP
+
+OXY
S
Pilot LED
Fail LED
Sensor Flow
Control Valve
Pump Reset
Switch
Pressure
Switch
Adjustment
Screw
(behind PCB)
Flowmeter
Interconnect
Terminal
Strip
S
+AMP 1
+
AMP 2 +
W G
S
OXY
Particle
Filter
Flowmeter Circuit
Board Connector
FLOW
FAIL
Inlet
Fitting
Exhaust
Fitting
This End
To Inlet
Fitting
FLOW
FAIL
3/4 NPT Conduit Hub
IR Flow Block
Pump Connector
IR Amplifier
WLELG BR
Sensor
Current
148mA
INLET
EXHAUST
Hydrophobic
Filter

8 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
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 12 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 NPT 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.

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 9
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: 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 amplifier
to the main circuit board.
NOTE: The amplifier is factory-wired to the main circuit board. See the “Installation”
section on page 12 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.
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
IR
Sensor
Flowmeter
Particle Filter
Flowmeter PCB
Exhaust Pressure Switch
Hydrophobic Filter
Inlet Restrictor
Sensor
Flow
Control
Valve

10 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
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 12
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 12 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
counterclockwise to increase the flow and clockwise 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.
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.

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 11
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 24 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.
IR Sensor/IR Sensor PCB
The IR sensor is an infrared type plug-in detector. Infrared combustible detectors are generally
used instead of the catalytic combustible detectors in applications where there may be catalyst
poisons such as silicone present or where oxygen is not present in the monitoring
environment.
The IR sensor is installed in the IR flow block, and the IR flow block is mounted to the middle
of the main circuit board. A small circuit board, the IR sensor PCB with a 4-wire cable mates
to the IR sensor and retains it in the flow block. The cable is wired to the main PCB. The IR
sensor PCB allows you to replace the sensor without disconnecting the wiring.
Amplifier
The amplifier converts the electrical output from the 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: Amplifier Component Location
S
PWR / SIG
Sensor
Current
148mA
Zero Pot
Span Pot
Controller
Terminal Strip
Detector
Terminal Strip
Test Points
100-500 mV Range
Factory Set Pots
WLELGBR

12 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
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.
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.
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?

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 13
Figure 4: Outline and Mounting Dimensions
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 4).
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.
Ø .30x .50 (4X) MOUNTING
.78
1.13
.40
Pilot Fail
.85
.80
4.50
NOTE: Housing is4.3 inchesdeep
8.88
4.00
6.50
35-3001
www.rkiinstruments.com
Sample Drawing
GasDetector
8.50

14 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
Connecting the Sample Lines to the Sample-Draw Detector
See Figure 6 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 6 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 5 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.
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 5 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 6 for the arrangement of the fitting components.
4. Route tubing from the inlet fitting to the sample area. See “Specifications” on page 5 for
maximum tubing lengths based on tubing size.

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 15
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 5 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 6 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 5 for maximum tubing lengths based
on tubing size.
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 three-conductor, shielded cable or three 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 5.
6. Close and latch the housing door of the sample-draw detector.

16 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
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 5. Refer to the controller operator’s manual and the controller detector
head specification sheet for the 35-3001A-01-XX1 for detector/terminal strip connections
specific to the controller.

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 17
Figure 5: 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.
Not Used on
This Version
S
PWR /SIG
ZERO
SPAN
OXY
Green
Black
Red
White
PATS201PATS201
OXY
AMP 1
FLOW
FAIL
FLOW
FAIL
PATS101PATS101
AMP 1
Contact
Monitoring
Device
OR
Controller or
Recording
Device
+24VDC
AMP 2
AMP 2
4/20 Signal
- (DC Ground)
IR Sensor
Resistive
Load Device
Power
WLELGB
R
Sensor
Current
148mA
IR Sensor
PCB
Low Flow
Relay Contact Ratings:
125 VAC 0.6A
30 VDC 1A
110 VDC 0.6A

18 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
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.
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
counterclockwise to increase the flow and clockwise 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.”

35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 19
Setting the Zero Reading
CAUTION: If you suspect the presence of combustible gas in the monitoring environment,
use the calibration kit and the zero air calibration cylinder to introduce “fresh
air” to the sensor and verify an accurate zero setting. See “Calibration” on
page 26 for instructions on using a zero air calibration cylinder for setting the
zero reading.
1. Verify that the sample-draw detector is sampling a fresh air environment (environment
known to be free of combustible gas).
2. Open the housing door.
3. Set a voltmeter to measure in the millivolt (mV) range.
4. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead into the
red (+) test point; plug the negative lead into the black (-) test point.
5. Verify a voltmeter reading of 100 mV (± 2 mV).
6. If necessary, use a small flat-blade screwdriver to adjust the zero potentiometer until the
voltmeter reading is 100 mV (± 2 mV).
7. Remove the voltmeter leads from the test points.
8. Close the housing door.
Low Flow Contact Operation
The low flow contact is closed during normal operation and opens during a low flow
condition or if the sample-draw detector loses power.
Monitoring of the low flow contacts can be done with a contact monitoring device that
does not exceed the relay ratings below. Alternatively, the contacts could be used to power
a device that does not exceed the relay contact ratings below. The ratings are for a resistive
load.
Table 2: Low Flow Relay Specifications
Voltage Amps
125 VAC 0.6 A
30 VDC 1 A
110 VDC 0.6 A

20 • 35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual
Maintenance
This section describes maintenance procedures. It includes preventive maintenance
procedures. This section also includes procedures to troubleshoot the sample-draw detector,
replace components of the sample-draw detector, adjust the low flow setting, and remove the
particle filter’s tubing stub.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum performance
of the sample-draw detector. It includes daily and biannual procedures.
Daily Visual Checks
1. Verify that the Pilot LED is on.
2. 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 to 1.0 SCFH. Turn the valve’s
knob counterclockwise to increase the flow and clockwise to decrease the flow.
3. Verify a display reading of 0% LEL 0% vol at the controller or a reading of 100 mV at the
amplifier test points. Investigate significant changes in the display reading.
Biannual Calibration
Calibrate the sample-draw detector as described in “Calibration” on page 26.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the sample-draw detector.
NOTE: This troubleshooting guide describes sample-draw detector problems only. See the
controller Operator’s Manual if the controller exhibits any problems.
Fail Condition
Symptoms
• The sample-draw detector’s Fail LED is on.
• The monitoring device is operating properly but indicates a reading well below zero or a
failure alarm.
Probable causes
• The sample-draw detector’s flow rate is too low because of an obstructed sample line,
failed pump, etc.
• The sample-draw detector is malfunctioning.
• The sensor and/or amplifier wiring is disconnected or misconnected.