RKI Instruments 65-2336RKSS User manual

65-2336RKSS
Carbon Monoxide Transmitter
Operator’s Manual
Part Number: 71-0345
Revision: 0
Released: 7/6/20
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2 • 65-2336RKSS CO Transmitter
WARNING
Read and understand this instruction manual before operating detec-
tor. 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 frequen-
cies for most applications are between 3 and 6 months, but can be
required more often or less often based on your usage.
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65-2336RKSS CO Transmitter • 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 APARTICULAR 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
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4 • 65-2336RKSS CO Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CO Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting the CO Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the CO Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Introducing Incoming Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting the Zero Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Replacing Components of the CO Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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65-2336RKSS CO Transmitter • 5
Overview
This instruction manual describes the 65-2336RKSS carbon monoxide (CO) transmitter. This
manual also describes how to install, start up, configure, maintain, and calibrate the
transmitter when using it with a gas monitoring controller. A parts list at the end of this
manual lists replacement parts and accessories for the CO transmitter. See the controller
operator’s manual for information specific to the controller.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1 lists specifications for the CO transmitter.
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions:
WARNING: When using the 65-2336RKSS, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2336RKSS and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2336RKSS as described in this manual.
Table 1: Specifications
Target Gas Carbon Monoxide
Area Classification Explosion-proof for Class I, Groups B, C, and D
Temperature Code T6
Installation Category Installation Category 1. Signal level, special equipment or
parts of equipment, telecommunication, electronic, etc.,
with smaller transient overvoltages than Installation
Category (Overvoltage Category) II (ref. IEC 664).
Input Voltage 11 VDC - 30 VDC
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 300 ppm (parts per million)
Accuracy ± 5% of reading or ± 5 ppm CO (whichever is greater)
CO Detector Signal Output 0.3 mA at 0 ppm CO nominal
2.5 mA at 300 ppm CO nominal
Response Time 90% in 30 seconds
Operating Temperature 23°F to 104°F (-5°C to 40°C)
!
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6 • 65-2336RKSS CO Transmitter
Description
This section describes the components of the CO transmitter. The CO transmitter is a 4 to 20
mA type detector head. It consists of the CO detector, amplifier, and junction box.
Figure 1: CO Transmitter Component Location
Span Pot
Factory Adjust Pot
100mV - 500mV
Range - Test Point (Black)
+TestPoint(Red)
S
SPAN
TOXIC OXY
Zero Pot
SIG/PWR ZERO
Controller
Terminal
Strip
Amplifier
Detector
Terminal
Strip
J-Box
CO
Detector
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65-2336RKSS CO Transmitter • 7
CO Detector
The CO detector consists of the detector housing body, detector housing cap, cap gasket, plug-
in sensor, and the charcoal filter.
Figure 2: CO Detector Component Location
Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the CO detector into the 3/4” NPT hub on
the bottom of the junction box. Two wires extend from the top of the detector housing body.
Use these wires to connect the CO detector to the amplifier. One of the wires is red and one of
the wires is black.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins
to secure the sensor within the detector housing. A pre-amplifier, located between the sockets
and two interconnect wires, conditions the sensor’s signal before the signal reaches the
controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it
from damage. The housing cap also includes a flame arrestor which contains any sparks that
may occur within the detector and a flame arrestor guard which protects the flame arrestor
from damage. Unscrew the detector cap to access the plug-in sensor for maintenance or
replacement. A cap gasket seals the interface between the housing and cap.
Plug-In CO Sensor
The sensor is secured within the detector assembly by the housing cap. Through a series of
chemical and electrical reactions, the sensor produces an electrical output that corresponds to
the detection range of the transmitter.
Plug-In CO Sensor
Rubber Boot With
Charcoal Filter
Detector Housing Cap
Detector Housing Body
Cap Gasket
Flame Arrestor
Guard
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8 • 65-2336RKSS CO Transmitter
Charcoal Filter
The disc-shaped charcoal filter is secured to the face of the CO sensor with a rubber boot. The
charcoal filter prevents interference gases (hydrogen sulfide [H2S] and certain hydrocarbons)
from producing false CO readings.
Amplifier
The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that
corresponds to the detection range and transmits the signal to a gas monitoring controller. A
foam gasket that orients the amplifier and keeps it from rotating is installed on the bottom of
the amplifier. The amplifier includes the controller terminal strip, detector terminal strip, zero
pot, span pot, and test points (see Figure 1).
Controller Terminal Strip
The controller terminal strip is a two position plug-in style terminal strip located at the top
edge of the amplifier. Use the controller terminal strip to wire the amplifier to a controller.
Detector Terminal Strip
The detector terminal strip is a four position plug-in style terminal strip located below the
controller terminal strip. Two of the positions are for use with an oxygen detector and are not
used in the CO transmitter. Use the two detector terminal strip positions that are labeled
“TOXIC” to connect the detector to the amplifier.
NOTE: The detector is factory-wired to the detector terminal strip. See “Wiring the CO
Transmitter to a Controller” on page 10 for all wiring procedures related to the
transmitter.
Zero Pot
The zero pot is located in the upper left corner of the amplifier (see Figure 1). Use a small flat
blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s zero
(CO free) output during the start-up and calibration procedure. Turn the adjustment screw
clockwise to increase the zero output and counterclockwise to decrease the zero output.
Span Pot
The span pot is located to the right of the zero pot (see Figure 1). Use a small flat blade
screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s response output
during the start up and calibration procedure. Turn the adjustment screw clockwise to increase
the response output and counterclockwise to decrease the response output.
CAUTION: The amplifier includes an additional pot. It is factory-set. Do not adjust it.
Test Points
The test points are on the left side of the amplifier (see Figure 1). The test points produce a
100 mV to 500 mV output that corresponds to the transmitter’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 lower left corner is the negative (-) test point and the
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65-2336RKSS CO Transmitter • 9
red test point below the zero pot is the positive (+) test point.
Junction Box
The stainless steel, corrosion resistant junction box allows you to install the detector at a
mounting site that is remote from a controller, and it protects the amplifier and wiring
connections made to the amplifier. Two conduit hubs allow you to mount the detector to the
junction box and connect the wiring from the detector to a controller. An O-ring seals the
interface between the junction box cover and the junction box base.
The amplifier is factory installed in the junction box. A cover on the front of the junction box
allows access to the interior of the junction box. A locking set screw on the junction box cover
allows you to secure the junction box cover and prevent it from being removed.
Installation
This section describes procedures to mount the CO transmitter in the monitoring environment
and wire the transmitter to a controller.
Mounting the CO Transmitter
1. Select a mounting site that is representative of the monitoring environment. Consider the
following when you select the mounting site:
• Select a site where the transmitter is not likely to be bumped or disturbed. Make sure
there is sufficient room to perform start-up, maintenance, and calibration procedures.
• Select a site that is at normal breathing level.
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10 • 65-2336RKSS CO Transmitter
Figure 3: Mounting the CO Transmitter
2. At the monitoring site you select, hang or mount the junction box with the detector facing
down (see Figure 3).
Wiring the CO Transmitter to a Controller
WARNING: If the controller’s construction is not explosion-proof, the controller must be
installed in an ordinary location. Do non install a non-explosion-proof
controller in a classified location.
1. Turn off the controller.
2. Turn off power to the controller.
3. Remove the junction box cover.
3.15
3.66
.20 Dia. x .45
Slot, 2X
3/4 NPT
Female,
2X
J-Box
CO Detector
2.40
1.10
3.34
8.25 max
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65-2336RKSS CO Transmitter • 11
4. The detector leads are factory wired. Verify that the detector leads are wired to the
amplifier’s detector terminal strip as shown in Figure 4.
5. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by grasping the
terminal strip and pulling. The detector terminal strip is keyed so that the controller and
detector terminal strips cannot be reversed inadvertently.
WARNING: To maintain the explosion proof classification of the CO detector/junction box
combination, a conduit seal must be used within 2 inches of the junction box
conduit hub used for wiring to the controller. Adhere to your local electrical
code when installing the conduit seal.
6. Guide either a two-conductor, shielded cable, or two wires in conduit through the top
conduit hub of the junction box.
7. Pull out the controller terminal strip, and connect the two wires to the terminal strip as
follows (see Figure 4):
• Connect the positive wire to the SIG/PWR “+” terminal.
• Connect the signal wire to the SIG/PWR “S” terminal.
CAUTION: If shielded cable is used, leave the cable shield’s drain wire disconnected and
insulated at the transmitter. You will connect the opposite end of the cable’s
drain wire to the controller’s chassis (earth) ground.
8. Reinstall the controller terminal strip into its socket.
9. Secure the junction box cover to the junction box.
10. Route the cable or wires leading from the CO transmitter through one of the conduit hubs
at the controller housing.
CAUTION: Do not route power and transmitter wiring through the same controller conduit
hub. The power cable may disrupt the transmission of the transmitter signal to
the controller.
11. Connect the wires to the applicable detector/transmitter terminal strip at the controller as
shown in Figure 4.
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12 • 65-2336RKSS CO Transmitter
Figure 4: Wiring the CO Transmitter to a Controller
12. 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.
ZERO SPAN
S
SIG/PWRTOXIC OXY
Install conduit seal
within 2 inches
Black
Cable Shield
Controller Detector/
Transmitter Terminals,
Typical Designations
Red
J-Box
CO Detector
Controller Housing
(installed in ordinary location if
device isnon-explosion-proof)
+
S
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65-2336RKSS CO Transmitter • 13
Start Up
This section describes procedures to start up the CO transmitter and place the transmitter 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. Refer to the controller
operator’s manual.
3. Turn on power to the controller.
4. Turn on the controller.
5. Verify that the controller is on and operating properly. Refer to the controller operator’s
manual.
CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next
section, “Setting the Zero Signal”.
Setting the Zero Signal
WARNING: Do not remove the detector housing cap or junction box cover while the
circuits are energized unless the area is determined to be non-hazardous. Keep
the detector housing cap and junction box cover tightly closed during
operation.
NOTE: If you can verify that the detector is in a fresh air environment (environment known to
be of normal oxygen content and free of toxic and combustible gases), it is not
necessary to apply zero air when verifying or setting the fresh air reading.
The procedure below describes applying zero emission air, usually called zero air, using a
calibration kit that includes a calibration cup, calibration gas, sample tubing, and a fixed flow
regulator with an on/off knob. RKI Instruments, Inc. recommends using a 0.5 LPM (liters per
minute) fixed flow regulator.
1. Unscrew and remove the junction box cover from the junction box.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. 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.
4. Screw the calibration cup onto the bottom of the CO detector.
5. Screw the regulator into the zero air calibration cylinder.
6. Use the sample tubing to connect the regulator to the calibration cup.
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
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14 • 65-2336RKSS CO Transmitter
8. Allow the gas to flow for two minutes.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the voltmeter
reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
12. Unscrew the calibration cup from the detector.
13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave the
sample tubing connected to the regulator and the calibration cup.
14. Store the components of the calibration kit in a safe and convenient place.
15. Remove the voltmeter leads from the test points.
16. Secure the junction box cover to the junction box.
Maintenance
This section describes maintenance procedures. It includes preventive maintenance,
troubleshooting, and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum performance
of the CO transmitter. It includes daily and quarterly procedures.
Daily
Verify a display reading of 0 ppm CO at the controller. Investigate significant changes in the
display reading.
Quarterly
Calibrate the CO transmitter as described in “Calibration” on page 19 of this manual. See the
calibration frequency discussion in “Calibration Frequency” on page 19 to determine if a
quarterly calibration schedule fits your needs.
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65-2336RKSS CO Transmitter • 15
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the CO transmitter.
NOTE: This troubleshooting guide describes transmitter problems only. See the controller
instruction manual for problems you may encounter with the controller..
Table 2: Troubleshooting the CO Transmitter
Condition Symptom(s) Probable Causes Recommended Action
Fail
Condition
Controller indicates a
fail condition.
• The transmitter wiring
to the controller is
disconnected or
misconnected.
• The plug-in sensor is
not properly plugged
into the sockets in the
detector housing body.
• The wiring from the
detector to the
amplifier is
disconnected or
misconnected.
• The transmitter’s zero
reading is low enough
to cause a fail
condition.
• The transmitter is
malfunctioning.
1. Verify that the transmitter wiring to
the controller is correct and secure.
2. Confirm that the plug-in sensor is
installed properly.
3. Verify that the wiring from the
detector to the amplifier is correct
and secure.
4. Perform a zero adjustment. A full
calibration is recommended.
5. If the fail condition continues,
replace the plug-in sensor as
described later in this section.
6. If the fail condition continues,
contact RKI for further instruction.
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Unable to accurately
set the zero or
response reading
during calibration.
• Transmitter requires
frequent calibration.
Note: Under
“normal”
circumstances, the
transmitter requires
calibration once every
3 months.
Some applications
may require a more
frequent calibration
schedule.
• The calibration
cylinder is low, out-
dated, or defective.
• The flame arrestor in
the detector housing
cap is wet or clogged
with dirt or other
particulates.
• The calibration gas is
not an appropriate
concentration.
• The transmitter is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Check the detector housing cap to
determine if the flame arrestor is wet
or dirty. Clean if necessary.
3. Verify that the calibration gas
concentration is appropriate for the
transmitter. Zero emission air (20.9%
oxygen) is normally used for a zero
adjustment if the environment is
suspect and 50 PPM CO in air is
normally used for a response
adjustment.
4. If the calibration/response difficulties
continue, replace the plug-in sensor
as described later in this section.
5. If the calibration/response difficulties
continue, contact RKI for further
instruction.
Unexplained
Upscale
Readings or
Alarms
• Controller indicates
a CO reading that
cannot be verified.
• CO alarms occur at
the controller that
cannot be explained.
• Charcoal filter is
saturated and no
longer scrubbing out
interfering gases.
1. Replace charcoal filter.
2. If difficulties continue, contact RKI
for further instructions.
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16 • 65-2336RKSS CO Transmitter
Replacing Components of the CO Transmitter
This section includes a procedure to replace the CO plug-in sensor, charcoal filter, and
amplifier. A procedure to replace the entire detector assembly is at the end of this section. In
most cases, it is not necessary to replace the entire detector assembly.
Replacing the Plug-In CO sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the
sensor when replacing it with a new one. If sensor electrolyte comes in contact
with your skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the detector housing cap from the detector housing body. Make sure not to lose
the cap gasket.
4. Unplug and remove the CO sensor with the boot and charcoal filter attached.
5. Remove the rubber boot and charcoal filter from old sensor.
6. Remove the replacement sensor from its packaging and remove the wire jumper. This wire
jumper is installed on the sensor pins for shipment or storage but must be removed for the
sensor to operate properly when installed in a detector.
WARNING: The CO sensor will not operate properly if the wire jumper is not removed.
7. Install the rubber boot with charcoal filter onto the replacement sensor’s face.
8. Carefully plug the replacement sensor into the four-socket pattern that is located in the
detector housing.
9. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
10. Turn on or plug in power to the controller.
11. Turn on the controller and place into normal operation.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with
the next step.
Figure 5: Plug-In Sensor Jumper Removal
Remove jumper
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65-2336RKSS CO Transmitter • 17
12. Calibrate the transmitter as described in “Calibration” on page 19.
Replacing the Charcoal Filter
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the detector housing cap from the detector housing body.
4. Unplug and remove the CO sensor with the boot and charcoal filter attached.
5. Remove the rubber boot that secures the charcoal filter to the CO sensor.
6. Remove the charcoal filter from the rubber boot.
7. Place the replacement filter in the rubber boot in the same position as the filter you
removed in the previous step.
8. Reinstall the rubber boot with charcoal filter to the CO sensor.
9. Carefully plug the replacement sensor into the four-socket pattern that is located in the
detector housing.
10. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
11. Turn on or plug in power to the controller.
12. Turn on the controller and place into normal operation.
Replacing the CO Detector
NOTE: In most cases, it is only necessary to replace the plug-in CO sensor.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Remove the detector terminal strip from its socket.
5. Disconnect the detector leads from the detector terminal strip. Note the position of the
color-coded leads as you remove them.
6. Unscrew the detector from the junction box conduit hub.
7. Guide the detector leads of the replacement detector through the bottom conduit hub of the
junction box, then screw the mounting threads of the detector into the conduit hub. If
necessary for environmental conditions, apply thread sealant or teflon tape to the hub and/
or detector threads to seal them.
8. Connect the detector leads to the appropriate detector terminal strip terminals. Connect the
red wire to the terminal labeled TOXIC+ and the black wire to the terminal labeled
TOXIC-. See Figure 4 for the detector wiring connections to the amplifier.
9. Reinstall the detector terminal strip into its socket.
10. Turn on or plug in power to the controller.
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18 • 65-2336RKSS CO Transmitter
11. Turn on the controller and place it into normal operation.
CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue
with the next step.
12. Calibrate the replacement detector as described in “Calibration” on page 19.
13. Secure the junction box cover to the junction box.
Replacing the Amplifier
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Unplug the detector terminal strip and controller terminal strip from their sockets. You
may leave the wires connected to the terminal strips.
5. Unscrew and remove the screw with the flat and lock washers that secures the amplifier to
the junction box. The screw is at the bottom right of the amplifier.
6. Remove the old amplifier.
7. Place the new amplifier in the same position as the old amplifier. A foam gasket that
orients the amplifier and keeps it from rotating is installed on the bottom of the amplifier.
Make sure the amplifier is seated flat in the junction box.
8. Install the new amplifier into the junction box with the screw, lock washer, and flat washer
you removed in Step 5.
9. Install the detector and controller terminal strips into their sockets on the new amplifier as
shown in Figure 4. If controller leads or detector leads were removed during this
procedure, refer to Figure 4 for the detector and amplifier connections.
NOTE: When a transmitter is first powered up with a new amplifier, the initial output may be
either high or below zero depending on the setting of the zero pot. Be sure to make
arrangements so that this does not cause unwanted alarms.
10. Turn on or plug in power to the controller.
11. Turn on the controller and place it into normal operation.
12. Allow the transmitter to warm up for 5 minutes.
13. Calibrate the CO transmitter as described in “Calibration” on page 19.
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65-2336RKSS CO Transmitter • 19
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most CO transmitter applications.
Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months for the CO transmitter.
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 frequency of every 6 months is adequate.
If an application is very demanding, for example if the environment is not well controlled,
then more frequent calibration than every 3 months may be necessary.
Calibration
This section describes how to calibrate the CO transmitter. It includes procedures to prepare
for calibration, set the zero reading, set the response reading, and return to normal operation.
It describes the test using a calibration kit that includes a calibration cup, calibration gas,
sample tubing, and a fixed flow regulator with an on/off knob. RKI Instruments, Inc.
recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
Preparing for Calibration
NOTE: Calibrating the CO transmitter may cause alarms. Be sure to put the controller into its
calibration program or disable external alarms before calibrating.
WARNING: Do not remove the detector housing cap or junction box cover while the
circuits are energized unless the area is determined to be non-hazardous. Keep
the detector housing cap and junction box cover tightly closed during
operation.
1. Unscrew and remove the junction box cover.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. 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.
4. Use the following formula to determine the correct test points output for the calibrating
sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 50 ppm CO and a fullscale setting of
300 ppm, the correct output is 167 mV.
167 (mV) = (50/300) X 400 +100
5. Screw the calibration cup onto the detector housing.
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Setting the Zero Reading
NOTE: If you can verify that the CO transmitter is in a fresh air environment, you do not need
to apply zero air to the detector before adjusting the zero reading.
1. Screw the regulator into the zero air calibration cylinder.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. Turn the regulator knob counterclockwise to open the regulator.
4. Allow the gas to flow for two minutes, then verify a reading of 100 mV (± 2mV). If
necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (± 2mV).
5. Unscrew the regulator from the zero air calibration cylinder.
6. Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1. Screw the regulator into the calibration cylinder. Verify that the calibration gas is
representative of the transmitter’s target gas.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the gas to flow for two minutes, then verify that the reading matches the response
reading (± 2mV) you determined earlier. If necessary, use the span pot on the amplifier to
adjust the reading to match the correct response reading.
4. Turn the regulator knob clockwise to close the regulator.
5. Unscrew the regulator from the calibration cylinder.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the components of the calibration kit connected by the sample
tubing.
3. Secure the junction box cover to the junction box.
4. When the display reading falls below the alarm setpoints, return the controller to normal
operation.
5. Verify that the controller display reading decreases and stabilizes at 0 ppm.
6. Store the components of the calibration kit in a safe and convenient place.
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