RKI Instruments 35-3001-13 Series User manual

www.rkiinstruments.com
35-3001-13-XX
Carbon Dioxide/Oxygen
Sample-Draw Detector
Operator’s Manual
Part Number: 71-0506
Revision: P1
Released: 9/10/19

35-3001-13-02 Carbon Dioxide/Oxygen 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.

35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
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

35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Internal Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Connecting the Sample Lines to the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Replacing Components of the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Adjusting the Low Flow Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Removing the Particle Filter’s Tubing Stub, if Necessary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Calibration, IR CO2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Calibration, Oxygen Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector • 5
Overview
This operator’s manual describes the 35-3001-13-XX carbon dioxide/oxygen 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 carbon dioxide/oxygen sample-draw detector. See the controller Operator’s
Manual for information specific to the controller.
Table 1: Specifications
Target Gases and Detection Range Carbon
Dioxide
(CO2)
35-3001-13-02: 0 - 5,000 ppm (parts per million)
35-3001-13-03: 0 - 5% volume
35-3001-13-05: 0 - 50% volume
35-3001-13-10: 0 - 100% volume
Oxygen 0 - 25% 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
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 Carbon Dioxide:
± 5% of reading or ± 2% of full scale (whichever is greater)
Oxygen:
± 0.5% O2

6 • 35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
WARNING: When using the 35-3001-13-XX, you must follow the instructions and warnings in this manual
to assure proper and safe operation of the 35-3001-13-XX and to minimize the risk of personal
injury. Be sure to maintain and periodically calibrate the 35-3001-13-XX as described in this
manual.

35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector • 7
Description
This section describes the components of the carbon dioxide/oxygen 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.
Figure 1: Component Location
Pump
O
X
Y
G
E
N
B
+
W
Oxygen
Sensor
Oxygen
Sensor
Terminal
Strip
IR CO 2 Sensor
PCB
BG
Mounting
Foot, 4X
_
S
OXY
+ RS
IR CO 2 Flow
Block
IR CO2 Sensor
(i nsi de b lo ck)
++
AMP AM P 2
Sensor Flow
Control V alve
Fail LED
Pilot LED
BG
In te rc onnect
Terminal
Strip
Pump Reset
Switch
Flowmeter
Pressure Switch
Adjustment Screw
(behind P CB)
OXY
GW
+ RS
AM P 2
+
AM P 1
+S
This End To
Inlet Fitting
LEL/ IR
W
Particle Filter
LEL/ IR
W
Flowmeter Circuit
Board Connector
Pump Connector
Oxygen Flow
Block
Exhaust
Fitting
Inlet
Fitting
3/4" C o ndui t H ub
EXHAUST
INLET
Hydrophobic
Filter
Detec tor/Am p
Term i nal Strip
(F actory W ir ed)

8 • 35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
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 11 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.
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.
Flowmeter
Pump
Restrictor
Oxygen
Sensor
Particle Filter
Flowmeter PCB
Exhaust
Sensor Flow
Control Valve
IR CO2
Sensor
Hydrophobic Filter
Pressure Switch
Inlet
Figure 2: Flow Diagram

35-3001-13-02 Carbon Dioxide/Oxygen 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 carbon dioxide sensor to the main circuit board.
NOTE: The carbon dioxide sensor is factory-wired to the main circuit board. See the “Installation” section on
page 11 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.
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 the “Installation” section on page 11
for all wiring procedures related to 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 11 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 11 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.

10 • 35-3001-13-02 Carbon Dioxide/Oxygen Sample-Draw Detector
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 “Adjusting the Low Flow Setting” on page 19 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 CO2Gas Sensor/IR CO2Sensor PCB
The CO2 sensor is an infrared type plug-in sensor. The IR CO2 sensor is installed in the IR CO2 flow block. The
IR CO2 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 CO2 sensor PCB, with a 4-wire cable mates to
the IR CO2 sensor and retains it in the flow block. The cable is wired to the main PCB. The IR CO2 sensor PCB
allows you to replace the sensor without disconnecting the wiring.
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 upper 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.