Page 1
35-3010A-11 Sample-Draw
Part Number: 71-0496
Revision: P1
Released: 5/29/19
Detector
www.rkiinstruments.com
Page 2
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.
35-3010A-11 Sample-Draw Detector
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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 witho u t our prior
approval.
a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses
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 d istributors,
dealers, and representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any a ccident or damage caused by the opera tion of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
35-3010A-11 Sample-Draw Detector
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Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Flow System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Detection System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Start Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Verifying the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Low Flow Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Replacing Components of the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Adjusting the Low Flow Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Calibration, LEL Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Calibration, H2S and IR CO2 Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
35-3010A-11 Sample-Draw Detector
Page 5
Overview
This manual describes t he 35-3010A-11 sample draw det ect or. Th is manual also describes
how to install, start up, maintain, and calibrate the sample draw detector when it is used
with a gas monitoring controller. A parts list at the end of this manual lists replacement
parts and accessories for the detector.
Specifications
Table 1 lists spe cifications for the 35-3010A-11.
Target Gases & Detection Ranges Combustible Gas: 0 - 100% LEL
Input Power 24 VDC
Current Draw 200 mA
Table 1: Specifications
Hydrogen Sulfide (H
Carbon Dioxide (CO
2
S): 0 - 100 pp m
2
): 0 - 5% volume
Construction (housing) Fiberglass/polyester (NEMA 4X)
Dimensions 15.44 in. H x 12.55 in. W x 8.31 in. D
Weight 14 lbs.
Sampling Method Sample draw
Sample Flow 1.2 SCFH (nominal)
Response Time 90% in 30 seconds
Accuracy Combustible Gas
:
± 5% of reading or ± 2% LEL (whichever is greater)
Hydrogen Sulfide
± 5% of reading or ± 2 ppm H
IR Carbon Dioxide (CO
:
S (whichever is greater)
2
):
2
± 5% of reading or ± 2% of full scale (whichever is greater)
WARNING: When using the 35-3010A-11, you must follow the instructions and
warnings in this manual to assur e proper and safe operation of the
35-3010A-11 and to minimize the r isk of personal injury. Be sure to
maintain and periodically calibrate the 35-3010A-11 as described in this
manual.
35-3010A-11 Sample-Draw Detector • 5
Page 6
Description
Amp 2Amp 1
Combustible Gas
and H2S Fl owB lock
IR CO2
Flow Block
IR CO2
Sensor
Pream p
Circuit Board
IR C O2 Trans mitter
Main Circuit Board
Pum p
Hydrophobic Filter
(AcroPak)
Exhaust F itting For 1/4" OD Rig id Tubi ng
CharcoalF ilter
Com bustible Gas Sensor
Dummy Plugfor Oxygen Sensor
Dum my Plug fo r CO Sensor
H2S Sensor
3/4 C onduitHub, 2X
Inlet Fitting For 1/4" OD Rigid Tubing
Reset S witch
This section describes the components of the 35-3010A-11 sam ple draw detector. The sample
draw detector consists of the housing, flow system, and detection system.
Housing
The sample draw detector’s fiberglass housing is weath e r- 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.
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. Use the two conduit hubs on the
bottom of the housing to make wiring connections.
An aluminum subpanel is mounted to th e interior of the housing. The sample draw
detector’s internal components are mounted to the subpanel.
6 • 35-3010A-11 Sample-Draw Detector
Figure 1: Sample Draw Detector Compo n en t Location
Page 7
Flow System
CO2
Charcoal
Filter
Pressu reSwitch
H2S
Oxygen
Dummy
Plug
Flow meter
Bypass
Valve
Flow Block
CO
Dummy
Plug
LEL
Pump
Exhaust
Inlet
Hydrophobic
Filter
The sample draw detector’s flow system consists of the INLET fitting, hydrophobic filter,
charcoal filter, pump, flowmeter, bypass valve, status lights, pressure switch, flow block,
and EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves
through the flow system.
Figure 2: Sample Draw Detector Fl ow Diagram
INLET Fitt i n g
The INLET fitting on the bottom of the housing allows the gas sample to enter the sample
draw detector. The INLET fitting accepts 1/4 in. rigid tubing. See “Installation” on
page 13 for instructions to connect tubing to the INLET fitting.
Hydrophobic Filter
The hydrophobic filter is to the left of the main circuit board. It is held in place by a metal
clip. It prevents water and other liquids from contaminating the flow system. Replace the
filter when it appears dirty, discolored, or clogged. If a liquid other tha n water is drawn
into the filter, replace the filter as soon as possible.
35-3010A-11 Sample-Draw Detector • 7
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Charcoal Filter
The charcoal filter is located in the top left corner of the enclosure. It is held in place by a
metal clip. The charcoal filter is placed after the H
S sensor and before the CO sensor (if
2
one is installed) in the flow system. It scrubs out interfering gases which may cause the
CO sensor to respond, such as H
S or certain hydrocarbons. It is included in this version
2
of the sample draw detector in case a CO sensor is added in the field. If a CO sensor is
added in the field, a new charcoal filter should also be installed.
Pump
The pump is located to the left of the main circuit board near the bottom left of the sample
draw detector. 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 to the sample draw
detector.
Flowmeter
The flowmeter is attached to the main circuit board near the top left corner (see Figure 1).
A ball in the flowmeter column indicates the flow rate of the sample draw detector. The
flowmeter measures the flow in the range 0.2 to 2.0 SCFH (Standard Cubic Feet per Hour).
Although the sample draw detector will operate down to a flow of 0.6 SCFH, the
optimum flow rate is 1.2 SCFH.
Bypass Valve
The bypass valve is to the left of the flowmeter. The bypass valve adjusts the flow rate to
the sensor. Use a flat-blade screwdriver to adjust the bypass valve.
NOTE: The bypass valve allows fine adjustments of the flow rate. For a wider range of
adjustment, use the flow adjust potentiometer (see Figure 1).
Status Lights
Two status lights are above the flowmeter.
Pilot Light
The green Pilot light is on when the sample draw dete ctor is receiving power.
Fail Light
The red Fail light is on when the sample flow rate is below the low flow level.
NOTE: The factory set low flow level is 0.6 SCFH (±0.2). See “Adjusting the Low Flow
Setting” on page 22 for instructions to adjust this setting.
Pressure Switch
The pressure switch is mounted to the opposite side of the main circuit board. The
pressure switch monitors the flow rate of the incom ing gas sample.
If the flow rate falls below the preset low flow level, the pressure switch causes the fail
relay to interrupt the sensor signal for the LEL channel and the 4-20 mA signal for H
and CO
channels. This causes a downscale reading at the monitor on these channels. The
2
low flow level is factory-set at 0.6 SCFH ( ±0 . 2 SCFH).
8 • 35-3010A-11 Sample-Draw Detector
S
2
Page 9
Flow Block
The flow block is located in the lower right corner of the sample draw detector. All the
sensors are installed in the flow block. The flow block routes the sampled air to each
sensor.
EXHAUST Fitting
The EXHAUST fitting on the bottom of the housin g allows the gas sample to exit the
sample draw detector. The EXHAUST fitting accepts 1/4 in. rigid tubing. See
“Installation” on page 13 for instructions to connect tubing to the EX HAUST fitting.
Detection System
The detection system consists of the LEL, H2S, and CO2 sensors, preamp circuit board,
and the main circuit board.
Combustible Gas Sensor
The combustible gas sensor is installed in the lower left of the flow block. The combustible
gas sensor includes the sensing elements, flame arrestor, connector, and sensor leads.
Sensing El ements
Two sensing elements are protected within the sensor assembly. Through a series of
thermal and electronic reactions, these elements produce an output that is proportional to
the detection range of the sample draw detector. The signal from the sensor is sent to a
controller.
The porous flame arrestor allows the gas sample to enter the sensor assembly and contact
the sensing element. The flame arrestor also contains sparks within the sensor.
Connector
The top of the sensor includes five pins that plug into the socket connector. This connector
allows you to replace the sensor without disconnecting the wiring. The sensor leads are
soldered to the connector.
Sensor Leads
Four color-coded leads extend from the connector. The leads allow you to connect the
combustible gas sensor to the main circuit board.
CO Dummy Plug
The CO sensor position in the flow block is occupied by a plastic dummy plug in the
35-3010A-11.
Hydrogen Sulfide Gas Sensor
The hydrogen sulfide gas sensor is installed in the upper right side of the flow block. It
has 4 pins which mate with sockets on the preamp circuit board.
Carbon Dioxide Sensor
The infrared carbon dioxide sensor is installed in the smaller flow block. A small circuit
board with a cable mates to it and retains it in the block. The cable is wired to the main
PCB.
35-3010A-11 Sample-Draw Detector • 9
Page 10
IR CO2 Transmitter
Zero Pot
Interconnect
Terminal Strip
Test Point TP-
Test Point TP+
Span Pot
The IR CO
transmitter is mounted above the main circuit boar d. It consists of the span
2
pot, zero pot, one internally wired terminal strip, and the test points.
Figure 3: IR CO
Span/Zero Pots
Transmitter
2
The span and zero pots are located at the bottom edge of the transmitter and are used for
calibration. Use the span pot to make adjustmen ts to gas response readings and the zero
pot to make adjustments to the zero reading.
Transmitter Interconnect Terminal Strip
The transmitter interconnect terminal strip is the seven-point terminal strip near the right
edge of the transmitter. The transmitter is factory wired to the sensor and main circuit
board.
Test Points
The test points are located on the left side of the transmitter and are labeled TP+ and TP-.
A 100 mV - 500 mV output is available at these test points for use during calibration.
Preamp Circuit Board
The preamp circuit is used to connect the CO and H
S sensors to the main circuit board
2
and to secure the sensors in the flow block. Two cables mate to the main circuit board: the
one on the left is for the CO sensor signal and the one of the right is for the H
S sensor
2
signal. Since the CO sensor is replaced with a dummy plug in the 35-3010A-11 the CO
sensor signal cable carries no signal in this version of the 35-3010RK.
10 • 35-3010A-11 Sample-Draw Detector
Page 11
Main Circuit Board
Test Point CAL + 2
Amp 1
(CO)
Zero Span Zero
Fai l LED
Sensor/Transmitter
Terminal Strip
Pre ssure Sw i tch
Reset
Switch
Pilot LED
Amp 2
(H2S)
Span
Test Point CAL + 1
Test Point CAL - 2
Te st Point CAL - 1
AC Te rminal
Strip Not Used
Interconnect Terminal
Strip
Low Flow Adjust
Flow Adjust Pot
Flowmeter
Pump Terminal Stip
Relay
Figure 4: Main Circuit Board
The main circuit board includes the interconnect terminal strip, sensor/transmitter
terminal strip, amp 1 circuit, amp 2 circuit, pump terminal strip, relay, and reset switch
(see Figure 3).
NOTE: The flowmeter and status lights are mounted to the main circuit board but are
considered part of the flow system.
Interconnect Terminal Strip
The interconnect terminal strip is the sixteen-point terminal strip near the bottom edge of
the main circuit board. Use the interconnect terminal strip to connect the sample draw
detector to the controller.
Sensor/Transmitter Terminal Strip
The sensor/transmitter terminal strip is the sixteen-point terminal strip near the right
edge of the circuit board. Use the sensor/transmitter terminal strip to connect sensors or
transmitters to the main circuit board.
NOTE: The sensors are factory wired to the sensor/transmitter terminal strip. See
“Wiring the Sample Draw Detector” on page 14 for all wiring procedures related
to the sample draw detector.
35-3010A-11 Sample-Draw Detector • 11
Page 12
Amp 1 and Amp 2 Circuits
These circuits are located to the left of the sensor/transmitter terminal strip. They each
include test points, a zero pot, and a span pot. Amp 1 is on the left and is for the CO
channel. Amp 2 is on the right and is for the H
S channel. Since there is no CO channel in
2
the 35-3010A-11, Amp 1 is not used.
The zero and span pots are used during calibration. Use the span pot to make adjustments
to gas response readings and the zero pot to make adjustments to the zero reading.
The test points are labeled CAL-1 and CAL+1 for the CO channel and CAL-2 and CAL+2
for the H
S channel. A 10 0 mV - 500 mV out put is available at the H2S test points for use
2
during calibration. No output is ava ilable at the CO test points.
Pump Terminal Strip
The pump terminal strip is the four-point terminal in the top left corner of the circuit
board. Use the pump terminal strip to connect the pump and pressure switch to the main
circuit board.
NOTE: The pump and pressure switch are factory-wired to the circuit board. See
“Wiring the Sample Draw Detector” on page 14 for all wiring procedures related
to the sample draw detector.
Relay
The relay is approximately in the middle of the circuit board. The relay is a four pole,
double-throw (4PD T) relay and is rated for 2 amps at 25 VDC (resistive). If the pressure
switch senses a low flow condition, the relay interrupts the signal from al l three channels
which will cause the display at the controller to indicate a fail condition for each channel.
Reset Switch
A small reset button is located in the upper left corner of the main PCB. When a low flow
condition occurs, the pump will be shut off. To reset the low fl ow condition and start the
pump again, press and hold the reset switch for abou t 2 seconds, then release.
12 • 35-3010A-11 Sample-Draw Detector
Page 13
Installation
Ø .31 x .50 slot, 4X
8.31
.18
Tube Fitting for 1/4"
OD tube, 2X
3/4" Conduit Hub, 2X
10.00
12.55
Door Latch
15.44
14.94
14.55
This section describes procedures to mount the sample draw gas 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 connections at
the bottom of the housing and tubing connections at the right of the housing?
• Make sure there is sufficient room to perform start-up, maintenance, an d
calibration procedures.
Figure 5: Mounting the Sample Draw Detector
2. Close and lat ch the housing door.
NOTE: The sam ple draw detector i s shi pped with the mounting feet “tucked under” the
housing to protect the mounting feet during shipment.
3. Slightly loosen the screw that secures one of the mounti ng f eet 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.
35-3010A-11 Sample-Draw Detector • 13
Page 14
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 in. or 5/16 in. 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
1. Attach 1/4 in. O.D. rigid polypropylene or rigid Teflon sample tubing to the INLET
fitting.
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.
2. Place the opposite end of the tubing at the sampling area.
CAUTION: Avoid loops or slumps in the incoming sample line. To reduce response time, keep the
incoming sample line as short as possibl e.
3. Attach rigid sample tubing to the EXHAUST fitting.
4. Route the opposite end of the tubing to an open area where the sample can safely
disperse.
Wiring the Sample Draw Detector
WARNING: Always verify that the power source is OFF b e fo re you make wiring
connections.
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. Unlatch and open the housing door of th e sample draw detector.
4. Guide a nine-conductor 18 gauge, shielded cable, or nine 18 gauge wires in conduit
through one of the cond uit hubs at the bottom of the samp le draw housing. If
necessary, use both hubs to bring the wires in making sure that all the wires for a
particular channel go through the same hub.
5. Connect the cable to the sample draw detector’s interconnect terminal strip as shown
in Figure 4.
6. Close and latch the housing door of the sample draw detector.
CAUTION: Leave the cable shield drain wire insulated and disconnec ted at the sample draw
detector. You will connect the opposite end of the drain wire at the device.
7. Route the cable or wires in conduit leading from the sample draw detector to the
controller.
8. Connect the drain wire to an available chassis ground at the controller end. RKI
controllers typically have a ground stud that can be used to ground the cable’s drain
wire.
14 • 35-3010A-11 Sample-Draw Detector
Page 15
Interconnect Terminal Strip
24 V DC -
24 V DC +
S (4/ 20 mA)
24 VDC +
S (4 /20 mA)
CO2 Ch annel
(Contro ller Transmitt er
Terminals)
H2S Channel
(Controller Transmitter
Terminals)
G
B
R
Mai n Circuit B oard
LEL Channel
(Controller LEL
Terminals)
W
Sample Draw Housing
Figure 6: External (Field) Wiring, Sample Draw Detector
35-3010A-11 Sample-Draw Detector • 15
Page 16
H2S
CO
Not
Used
H2SS ensor
Plugs Into
Far Side of
Preamp
Circuit Board
Black
Green
White
LELS ensor
Connector
Red
Gre en
White
Black
Red
CO2 S ensor
Connector
Red
Black
Yellow
LELS ensor
CO2 S ensor
Figure 7: Internal (Factory) Wiring, Sample Draw Detector
16 • 35-3010A-11 Sample-Draw Detector
Page 17
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 power wiring to the controller is correct and secure. See the controller
instruction manual.
3. Turn on or plug in the incoming power at the controller, then turn on the controller.
4. Verify that the controller is on and operating properly.
5. Verify that the Pilot light is on at the sample draw de tector.
6. Verify that the flowmeter indicates a flow rate of approximately 1.2 SCFH. If
necessary, use the bypass valve or flow adjust potentiometer to adjust the flow rate.
NOTE: The following step tests for leaks in the sample line. This test may cause a low
flow condition at the sample draw detector.
7. Verify that the incoming sample line is not le aking. To test the sample line, 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, press the pump reset switch, and verify the
flowmeter returns to a normal flow rate.
Verifying the Fresh Air Reading
CAUTION: If you suspect the presence of combustible gas, tox i c gases, an abnor ma l CO2
condition (not 200 - 400 ppm), or an abnormal oxygen condition (not 20.9%) in the
monitoring environment, use a zero ai r cylinder to verify an a ccurate fresh air
reading.
1. Verify a reading of 0% LEL for the combustible gas channel at the controller.
If the display reading is 0% LEL, the combustible detector is in normal operation.
If the display reading is not 0% LEL, perform a zeroing operation as described in
“Setting the Zero Reading” on page 23.
2. Verify a re ading of 0 ppm for the H
If the reading is 0 ppm, the H
2
If the reading is not 0 ppm, perform a zeroing operation as described in “Setting the
Zero Reading” on page 24.
3. Verify a reading of the background concentra tion of CO2 at the controller. Typical
background concentrations of CO
location.
If the CO
reading is the background concentration, the CO2 channel is in normal
2
operation.
S channel at the controller.
2
S channel is in normal operation.
vary from about 200 to 400 ppm depending on
2
If the CO
reading is not the background concentration, perform a zeroing operation
2
as described in “Setting the Zero Reading” on page 24.
35-3010A-11 Sample-Draw Detector • 17
Page 18
Operation
Normal Operation
During normal operation, the Pilot LED will be on and the flowmeter will indicate a b out
1.2 SCFH. The current gas readings will be indicated at the controller. See the controller’s
operator’s manual for a description of the reading indications.
Low Flow Alarm
If the flowrate falls below 0.6 SCFH (±0.2 SCFH), then the sample draw detector will
initiate a low flow alarm. In a low flow alarm the Fail LED will turn on and the pump will
shut off. In addition, the sensor signals to the controller will be interrupted by the sample
draw detector resulting in a failure indicat ion for each channel at the controller. If a low
flow alarm occurs, press the pump reset s wit ch for about 2 seconds to restart the pump,
turn off the Fail LED, and resume proper sensor signal transmission to the controller. If the
condition continues, find the cause of the reduced flow, correct it, and restart the pump
with the pump reset switch. A flow reduction can be caused by a flow blockage, a leak in
the flow system, a malfunctioning pres sure switch, or a malfunctioning pump.
18 • 35-3010A-11 Sample-Draw Detector
Page 19
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, and adjust the low flow setting.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the sample draw detector. It includes daily and quarterly procedures.
Daily
1. Verify that the pilot light is on.
2. Verify that the flowmeter indicates a flow rate of approximately 1.2 SCFH.
If necessary use the bypass valve or flow ad just potentiometer to adjust the flow rate
to 1.2 SCFH.
3. Verify a reading of 0%LEL for the combustible channel, 0 ppm for the H
(100 mV at the amp 2 test points), and background concen trat i on for the CO
(typical background concentration of CO
is about 0.04% volume depending on
2
S channel
2
channel
2
location).
4. Investigate significant changes in the display reading.
Quarterly
Calibrate the sample draw detector as described in the “Calibration” section.
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 instruction manual for the controller if it exhibits any problems.
Fail Condition
Symptoms
• The sample draw detector’s Fail light is on.
• The controller is operating properly but indicates a reading well below zero on one or
more channels.
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 or transmitter wiring is disconnected or misconnected.
Recommended Action
1. At the sample draw detector, set the correct flow rate with the bypass valve or flow
adjust potentiometer.
2. If you cannot set the correct flow rate, check the sample lines for obstructions or kinks.
35-3010A-11 Sample-Draw Detector • 19
Page 20
3. Verify that the sensor wiring is correct and secure. “Wiring the Sample Draw
Detector” on page 14 describes detector wiring connections.
4. Calibrate the problem channel or channels as described in the Calibration section.
5. If the fail condition continues, replace the sensor from the problem channel or
channels as described later in this section.
6. If the fail condition continues, contact RKI Instruments, Inc. for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
Symptoms
• Unable to accurately set the zero or response reading on one or more of the channels
during the calibration procedure.
• One or more of the sensors requires frequent calibration.
NOTE: Under “normal” circumstances, the sample draw detector requires calibration
once a quarter . Some applic ations may req u ire a more frequ ent calibrati o n
schedule.
Probable Causes
• The calibration cylinder is low, out-dated, or defecti v e.
• 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.
Recommended Action
1. Verify that the calibration cylinder contains an adequate supply of a fresh test sample.
2. If necessary, set the correct flow rate with the bypass valve or flow adjust
potentiometer.
3. If you cannot set the correct flow rate, check the sample line for obstructions or kinks.
4. If the calibration/response difficulties continue, replace the sensor as described later
in this section.
5. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for
further instruction.
Replacing Components of the Sample Draw Detector
This section includes procedures to replace the sensors, the hydrophobic filter, and the
charcoal filter.
Replacing the Combustible Sensor
1. Turn off incoming power.
2. Open the housing door of the sample draw detector.
3. Unscrew and remove the two screws that secure the retaining plate, then lift the plate,
connector, and sensor out of the housing.
4. Unplug the co nnector from the se nsor.
5. Verify that you are using the correct replacement sensor (NC-6245 is printed on the
sensor), then plug the sensor into the connector.
6. Place the sensor in the combustible gas sensor cavity, then position the retaining plate
on the two standoffs.
20 • 35-3010A-11 Sample-Draw Detector
Page 21
7. Secure the retaining plate to the standoffs with the two screws you removed in step 3.
8. Turn on incoming power.
9. Calibrate the replacement sensor as described in “Calibration, LEL Detector” on
page 23.
Replacing the Hydrogen Sulfide Sensor
1. Turn off incoming power.
2. Open the housing door of the sample draw detector.
3. Unscrew t he 5 screws that retain the preamp circu i t board.
4. Lift the preamp circuit board away from the flow block.
Be careful not to pull on the cables that connect the preamp circuit to the main circuit
board.
There is a foam gasket in the bottom of each flow cavity beneath th e circuit board.
Make sure the gaskets stay in place.
5. Pull the H
S sensor off the preamp circuit board. It is located in the amp 2 position
2
(right side) of the preamp circuit board.
6. Plug the new sensor into the preamp board.
7. Reinstall the preamp circuit board with the sensors onto the flow block.
8. Turn on incoming power.
9. Calibrate the replacement sensor as described in “Calibration, H
S and IR CO2
2
Detectors” on page 24.
Replacing the IR CO
Sensor
2
1. Turn off or unplug incoming power.
2. Unscrew the four screws that hold the circuit board on the flow block.
3. Pull the circuit board off the flow block.
4. Unplug the infrared detector from the circuit board.
5. Plug the new detector into the circuit board.
6. Reinstall the circuit board to the flow block .
7. Turn on or plug in power.
8. Calibrate the replacement sensor as described in “Calibration, H
S and IR CO2
2
Detectors” on page 24.
Replacing the Hydrophobic Filter
1. Turn off or unplug power to the controller.
2. Locate the hydrophobic filter. It is just to the left of the main circui t board.
3. Grasp the hydrophobic filter and pull it out of its metal clamp.
4. Remove the rubber seals from each end of the hydrophobic filter and remove the
filter.
5. Place the new hydrophobic filter in the same orientation as the one th at w as remo ved.
6. Place the new hydrophobic filter back into the metal clamp.
35-3010A-11 Sample-Draw Detector • 21
Page 22
Replacing the Charcoal Filter
NOTE: The charcoal filter does not normally need to be replaced in the 35-3010A-11
because it does not include a CO sensor.
1. Turn off or unplug power to the controller.
2. Locate the charcoal filter. It is located along the upper edge of the detector housing.
3. Grasp the charcoal filter and pull it out of its metal clamp.
4. Remove the rubber seals from each end of the charcoal filter and remove the filter.
5. Place the new charcoal filter in the same orientation as the one that was removed.
6. Place the new charcoal filter back into the metal clamp.
Adjusting the Low Flow Setting
The factory-set low flow setting is 0.6 SCFH (±0.2). To adjust the low flow setting:
1. Use the flow adjust potentiometer (VR1) to set the flow to 0.6 SCFH.
If the sample draw detector goes into low flow alarm before you can adjust the flow
down to 0.6 SCFH, adjust the low flow potentiometer 1/4 turn clockwise, then
attempt to set the flow again. Repeat this step until you are able to adjust the flow to
0.6 SCFH.
2. Slowly turn the low flow potentiometer counterclockwise just until the sample draw
detector goes into low flow alarm.
NOTE: The low flow potentiometer is accessible through a circular cutout in the main
circuit board. The cutout is labeled PS1.
3. Verify that the low flow alarm is 0.6 SCFH (±0.2). Repeat steps 3 and 4 if necessary.
4. Use the flow adjust potentiometer (VR1) to set the flow to 1.2 SCFH.
5. Make sure the sample draw detector’s Fail light is off.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applica tions, a
calibration frequency of every 3 months is adequate for most combustible gas and H
detector applications and every 6 months for most IR CO
experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months for the combustible gas and H
detectors and every 6 months for the IR CO
If an application is not very demanding, for example detection in a clean, temperature
controlled environment, and calibration adjustments are minimal at calibration, then a
calibration freque nc y of every 6 months is adequate for combustibl e gas and H
detectors and every 9 to 12 months is adequate for the IR CO
detector.
2
detector applications. Unless
2
S
2
detector.
2
S
2
S
2
If the application is very demanding, for example if the environ ment is not well
controlled, then more frequent calibration than every 3 months for the combustible gas
and H
22 • 35-3010A-11 Sample-Draw Detector
S detectors and every 6 months for the IR CO2 detector may be necessary.
2
Page 23
Calibration, LEL Detector
This section describes how to calibrate the LEL sensor in the sample draw detector. It
includes procedures to set the zero reading, set the response reading, and return to normal
operation.
NOTE: This procedure describes calibration using a demand flow regulator, a zero air
calibration cylinder, and a 4-gas calibration cylinder.
Setting the Zero Reading
NOTE: If you can verify a fresh air environment, it is not necessary to use the zero air
calibration cylinder to set the zero reading.
1. Open the housing door.
2. Screw the regulator into the zero air calibration cylinder.
3. Connect the calibration kit sample tubing to the regulator.
4. The zero reading for the LEL channel is set at the controller. See the controller
operator’s manual for instructions to set the zero reading.
5. When the instructions call for applying gas to the detector, connect the sample tubing
from the regulator to the inlet line at or near the INLET fitting.
6. Allow the gas to flow for 1 minute.
7. Set the zero reading according to the controller operator’s manual.
8. Disconnect the sample tubing from the inlet line.
9. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator.
Setting the Response Reading
1. Screw the regulator into the 4-gas calibration cylinder.
2. Connect the sample tubing to the regulator.
3. Follow the directions in the controller’s operator’s manual for setting the response
reading for the LEL channel.
4. When the instructions call for applying gas to the detector, connect the sample tubing
from the regulator to the inlet line at or near the INLET fitting.
5. Allow the calibration gas to flow for 1 minute.
6. Set the response reading according to the controller operator’s manual to match the
calibration gas concentration.
7. Disconnect the sample tubing from the inlet line.
8. Unscrew the regulator from the calibration cylinder.
NOTE: For convenience, leave the regulator connected to the sample tubing.
35-3010A-11 Sample-Draw Detector • 23
Page 24
Returning to Normal Operation
1. Remove the voltmeter leads from the test points.
2. Reconnect the incoming sample line.
3. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to
stabilize.
4. Close the housing door.
5. Store the components of the calibration kit in a safe and convenient place.
Calibration, H2S and IR CO2 Detectors
This section describes how to calibrate the H2S and IR CO2 detectors in the sample-draw
detector. It includes procedures to prepare for calibration, set the zero reading, set the
response reading, and return to normal operation.
NOTE: This procedure describes calibration using a demand flow regulator, a zero air
calibration cylinder, a 4-gas calibration cylinder, and a CO2 calibration cylinder.
Preparing for Calibration
CAUTION: This procedure may cause alarms at the controller. Take appropriate action to avoid
this, such as entering the calibration mode at the controller.
1. Open the housing door.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. For H
S detector calibration: Plug the voltmeter leads into the test points in the AMP 2
2
section of the main circuit board. Plug the positive lead into the test po int labeled
CAL+2; plug the negative lead into the test point labeled CAL-2.
4. For IR CO
detector calibration: Plug the voltmeter into the test points on the IR CO2
2
transmitter. Plug the positive lead into the test point labelled TP+; plug the negative
lead into the test point labelled TP-.
5. Use the following formula to determine the correct test points output for the H
CO
calibrating samples.
2
S and
2
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 25 ppm H
ppm H
S, the correct output for the H2S test points is 200 mV.
2
S and a fullscale setting of 100
2
200 (mV) = (25/100) X 400 +100
Setting the Zero Reading
1. Screw the regulator into the zero air cylinder. If you are sampling a fresh air
environment, you don’t need to use a zero air cylinder to zero the H
However, even if you are sampling a fresh air environment, since CO
present in fresh air, you must use either a zero air cylinder, a 4-gas cylinder, or a CO
scrubber to zero the CO
2. Connect the calibration kit sample tubing to the regulator.
24 • 35-3010A-11 Sample-Draw Detector
channel.
2
S channel.
2
is always
2
2
Page 25
3. Connect the sample tubing from the regulator to the inlet line at or near the INLET
fitting.
4. Allow the gas to flow for 1 minute.
5. Verify a voltmeter reading of 100 mV ± 2 mV at the AMP 2 test points for the H
S
2
channel as described in the Preparing for Calibration section above.
6. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the H
S
2
channel until the voltmeter reading is 100 mV ± 2 mV.
7. Verify a voltmeter reading of 100 mV ± 2 mV at the IR CO
test points as described in
2
the Preparing for Calibration section ab ove.
8. If necessary, use a small flat-blade screwdriver to adjust the zero pot for the CO
2
channel until the voltmeter reading is 100 mV ± 2 mV.
9. Disconnect the sample tubing from the inlet line.
10. Unscrew the regulator from the zero air cylinder. Leave the sample tubing connected
to the regulator.
Setting the Response Reading
1. Screw the regulator into the 4-gas calibration cylinder.
2. Connect the sample tubing from the regulator to the inlet line at or near the sa mple
draw detector’s INLET fitting.
3. Allow the calibration gas to flow for 1 minute.
4. Check the mV output on the AMP 2 test points for H
matches the response reading (±2 mV) you determined earlier.
5. If necessary, use the AMP 2 span pot to adjust the reading to match the correct
response reading.
6. Disconnect the sample tubing from the sa mple draw detector’s inlet line.
7. Unscrew the regulator from the 4-gas cal ibration cylinder.
8. Screw the regulator into the CO
calibration cylinder.
2
9. Connect the sample tubing from the regulator to the inlet line at or near the sa mple
draw detector’s INLET fitting.
10. Allow the calibration gas to flow for 1 minute.
11. Check the mV output on the IR CO
test points and verify that the reading matches
2
the response reading (±2 mV) you determined earlier.
12. If necessary, use the span pot on the IR CO
transmitter to adjust the reading to match
2
the correct response reading.
S and verify that the reading
2
13. Disconnect the sample tubing from the sample draw detector’s inlet line.
14. Unscrew the regulator from the CO
calibration cylinder.
2
NOTE: For convenience, leave the regulator connected to the sample tubing.
Returning to Normal Operation
1. Remove the voltmeter leads from the test points.
2. Reconnect the incoming sample line.
35-3010A-11 Sample-Draw Detector • 25
Page 26
3. Wait 1 to 2 minutes to allow the calibration gas to be drawn out and the reading to
stabilize.
4. Close the housing door.
5. Store the components of the calibration kit in a safe and convenient place.
Parts List
Table 4 lists replacement parts and accessories for the sample draw gas detector.
Table 2: Parts List
Part Number Description
06-1248RK Sample tubing, 3/16 x 5/16, specify length (for calibration kit)
07-0034RK Sealing gasket for H
S flow block cavity
2
30-0610RK Pump
33-0171RK Hydrophobic filter (AcroPak)
33-6010RK-01
33-6095RK Charcoal filter, CF-188
61-5040RK-03 IR CO
81-0072RK-01 2.5% volume CO
81-0072RK-03 2.5% volume CO
sensor, 0 - 5% volume
2
in N2 calibration cylinder, 34 liter steel
2
in N2 calibration cylinder, 103 liter
2
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0154RK-04 4-gas calibration gas cylinder, 50% LEL methane/12% oxygen/25 ppm H
S/50
2
ppm CO, 34 liter aluminum
81-1054RK Regulator, demand flow, for 34 liter aluminum, 58 liter, and 103 liter cylinders
(cylinders with external threads)
81-1055RK Regulator, demand flow, for 17 and 34 liter steel cylinders (cylinders with
external threads)
ES-1537-H2S H
S sensor
2
NC-6245 Combustible gas sensor
26 • 35-3010A-11 Sample-Draw Detector
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