RKI Instruments 35-3001A-10 User manual

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35-3001A-10
Oxygen/Carbon Monoxide
Sample-Draw Detector
Operator’s Manual
Part Number: 71-0558
Revision: P1
Released: 5/3/21

2 • 35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector
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-10 Oxygen/Carbon Monoxide Sample-Draw Detector • 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-10 Oxygen/Carbon Monoxide Sample-Draw Detector
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
External Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Internal Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mounting the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connecting the Sample Lines to the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Replacing Components of the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Adjusting the Low Flow Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Removing the Particle Filter’s Tubing Stub, if Necessary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Calibration, Oxygen Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Calibration, CO Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector • 5
Overview
This operator’s manual describes the 35-3001A-10 oxygen/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 oxygen/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
Oxygen: 0 - 25% 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
Response Time 90% in 30 seconds
Accuracy Oxygen:
± 0.5% O2
Carbon Monoxide:
± 5% of reading or ± 5 ppm CO (whichever is greater)

6 • 35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector
WARNING: When using the 35-3001A-10, you must follow the instructions and warnings in this
manual to assure proper and safe operation of the 35-3001A-10 and to minimize the
risk of personal injury. Be sure to maintain and periodically calibrate the 35-3001A-
10 as described in this manual.

35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector • 7
Description
This section describes the components of the oxygen/carbon monoxide sample-draw detector.
Figure 1: Component Location
+
W
CO Amplifier
CO Sensor
(inside block)
Pump
PumpConnector
Oxygen Sensor
Terminal Strip
Mounting
Foot, 4X
Oxygen A mplif ier
OXYTOXIC SIG / PWR
S
Oxygen
Sensor
BG
CO FlowBlock
S
++
AMP AMP 2
S
OXY
+ R
Pilot LED
Sensor Flow
Control Valve
Fail LED
Pressure Switch
Adjustment Screw
(behind PCB)
Pump Reset
Switch
Flowmeter
R
3/4" Conduit Hub
BG
OXY
GW
+
+
AMP 1
S
+S
AMP 2
Flow Baffle
This End To
Inlet Fitting
O
X
Y
G
E
N
B
Particle Filter
Oxygen Flow
Block
_
Interconnect
Terminal
Strip
LEL /IR
W
LEL /IR
W
Flowmeter Circuit
BoardConnector
Exhaust
Fitting
Inlet
Fitting EXHAUST
INLET
Detector/Amp
Terminal Strip
(Factory Wired)
Hydrophobic
Filter

8 • 35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector
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 page 13 for instructions 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.
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: Flow Diagram
Restrictor
Oxygen
Sensor
Pump
CO
Sensor
Flowmeter
Flow Baffle
Particle Filter
Sensor Flow
Control Valve
Exhaust
Flowmeter PCB
Pressure Switch
Hydrophobic Filter
Inlet

35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector • 9
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 oxygen sensor to the oxygen
amplifier and to connect the oxygen amplifier and the carbon monoxide sensor to the main circuit
board.
NOTE: The oxygen sensor is factory wired to the oxygen sensor terminal strip. The oxygen amplifier
and the carbon monoxide sensor are factory-wired to the main circuit board. See page 13 for
wiring instructions.
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. Use the oxygen sensor terminal strip to connect the oxygen sensor to the main circuit
board.
NOTE: The oxygen sensor is factory-wired to the main circuit board. See page 13 for wiring
instructions.
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 page 13 for wiring instructions.
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 page 13 for wiring
instructions.

10 • 35-3001A-10 Oxygen/Carbon Monoxide 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.
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 page 23 for instructions 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.
Oxygen Sensor
The oxygen sensor is installed in a flow block and the 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. The oxygen
sensor is retained in the flow block by a bracket with two screws.
The oxygen cell is protected within the sensor assembly. Through a series of chemical and electronic
reactions, the oxygen cell produces a millivolt output that is proportional to the detection range of the
sample-draw detector. The leads extending from the sensor terminate in lugs that connect to the
oxygen terminal strip.