65-2322RK
Part Number: 71-0157RK
Revision: 0
Released: 2/11/11
Oxygen Transmitter
Operator’s Manual
RKI Instruments, Inc.
www.rkiinstruments.com
WARNING
Read and understand this instruction manual before operating
detector . Improper use of the dete ctor 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.
T ypical calibration frequencies for most applications a re between
3 and 6 months, but can be required more often or less often
based on your usage.
65-2322RK Oxygen Transmitter
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 fr o m date of shipment
from RKI Instruments, Inc. Any parts found defective withi n tha t 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 ser v ice, and
which must be cleaned, repaired, or replaced on a routine basis. Examples of such items
are:
W arranty 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 , a nd we are not r esponsible for removal or r eplacement costs,
local repair costs, transportation costs, or contingent expenses incurred without 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 RK I 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 i ndemnification for any accident or dama g e ca u s e d by the operation of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
65-2322RK Oxygen Transmitte r
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting the Oxygen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring the Oxygen Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Verifying/Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Replacing Components of the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
65-2322RK Oxygen Transmitter
Overview
!
This instruction manual describes the explosion proof capillary type oxygen transmitter
65-2322RK. This manual also de scribes 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 oxygen transmitter. See
the controller operator’s manual for info rmation specific to the controller.
Specifications
Table 1 lists specif ications for the oxygen transmitter.
Table 1: Specifications
Target Gas Oxygen
Sampling Method Diffusion
Detection Range 0 to 25%
Accuracy ± 0.5% O
Area Classification CSA classified explosion proof for Class I, Groups B, C, and D
Temperature Code T6
Installation Category Installation Category 1. Signal level, special equipm ent or parts of
equipment, telecommunication, electronic, etc., with smaller
transient overvoltages than Installati on Category (Overvoltage
Category) II (ref. IEC 664).
Signal Output 4 to 20 mA
Oxygen Detector Signal Output 0 mV at 0% oxygen nominal
18 mV at 25% oxygen nominal
Response Time 90% in 30 seconds
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions :
W ARNING: When using the 65-2322RK, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2322RK and to
minimize the risk of personal injury. Be sure to maintain and period ically
calibrate the 65-2322RK as described in this manual.
2
65-2322RK Oxygen Transmitter • 1
Description
This section describes the components of the oxygen transmitter. The oxygen transmitter
is a 4 - 20 mA type detector head. It consists of the oxygen detector, amplifier, and junction
box.
Factory Adjust Pot
Span Pot
Controller Terminal Strip
10 0m V - 500m V
Range
Zero Pot
+ Test Point (Red)
- Test Point (Black)
Amplifier
SPAN
ZERO
S
SIG/PWR TOXIC OX Y
Detector Term in al Strip
J-Box
Oxygen Dete ctor
2 • 65-2322RK Oxygen Transmitter
Figure 1: Oxygen Transmitter Component Location
Oxygen Detector
The oxygen detector consists of the detector housing body, detector housing cap, cap
gasket, and the plug-in sensor.
Detector Housing Body
Cap Gasket
Plug- in Oxygen Senso r
Det ector Housi ng Cap
Flam e Arr est or
Guard
Figure 2: Oxygen 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 housi ng to screw the oxygen 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 oxygen detector to the amplifier. One of the
wires is white and one of the wires is green.
The housing includes two sockets installed on a circuit board. These sockets accept the
plug-in sensor’s two pins to provide electrical connection for the sensor. The circuit board
with the sockets conditions the sensor’s signal before the signal reaches the amplifier.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. A foam gasket is installed inside the ho using cap that seals
against the sensor face. The housing cap also includes a flame arrestor which contains any
sparks that may occur within the detector and a flam e arrestor guard wh ich protects th e
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 Oxygen Sensor
The plug-in sensor is secured in the dete ctor assembly by the housing cap. Through a
series of chemical and electrical reactions, the sensor produces a millivolt output that
corresponds to the detection range of the transmitter.
65-2322RK Oxygen Transmitter • 3
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 s trip 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 a toxic gas dete ctor and are
not used in the oxygen transmitter. Use the two detector terminal st rip positions that are
labelled “OXY” to connect the detector to the amplifier.
NOTE: The detector is factory-wired to the detector terminal strip. See “Wiring the
Oxygen Transmitter to a Controller” on page 6 for all wirin g 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 th e amplifier’s
zero (oxygen free) output during the 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 fresh air
output during the start up and calibration procedure. Turn the adjustment screw
clockwise to increase the fresh air output and counterclock wise to decrease the fresh air
output.
CAUTION: The amplifier includes an additional potentiometer. 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 star t-up and
calibration procedures. The black test point in the lower left corner is the negative (-) test
point and the red test point below the zero pot is the positive (+) test point.
Junction Box
Use the junction box to install the transmitter at a mounting site that is remote from the
controller. The junction box protects the amplifier and wiring connections made to the
amplifier. Use the top 3/4 inch conduit hub to connect wiring from the amplifier to the
controller. Use the cover on the f ront of the junction box to access the interior of the
junction box. The detector and amplifier are factory installed in the junction box. Three
spacers installed on the back of the junction box control the distance of the junction box
4 • 65-2322RK Oxygen Transmitter
Installation
3/4 NPT
Female
from a mounting surface and ensure that there is enough room to install a calibration cup
on the detector during calibration.
This section describes procedures to mount the oxygen transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the Oxygen 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.
3.10
.75
.38
3.65
8.25 Max
J-Box
Oxygen
Detector
1 1/2 - 20 Thr ead
for Calibration Cup
Figure 3: Mounting the Ox ygen Transmitter
Rubber
Sp ace r, 3X
2. At the monitoring site you select, hang or mount th e jun c tion box with the detector
facing down (see Figure 3).
65-2322RK Oxygen Transmitter • 5
Wiring the Oxygen Transmitter to a Controller
WARN ING: Always verify that power to the controller is off before you make wiring
connections.
1. Turn off the controller.
2. Turn off power to the controller.
3. Remove the junction box cover.
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 sock et by
grasping the terminal strip and pulling. The detector terminal strip is keyed so that
the controller and detector terminal strips cannot be reversed in advertently.
WARN IN G: To maintain the explosion proof classification of the oxygen detector/
junction box combination, a conduit seal must be used within 18 inches of
the junction box conduit hu b used for wiring to the controller.
6. Guide either a two-conductor, shielded cable or two wires in conduit that is
appropriate f o r hazardous locations 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 oxygen 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 cabl e may disrupt the transmission o f the transmitte r signal to the
controller.
11. Connect the wires to the applicable detector/transmitter terminal strip at the
controller as shown in Figure 4.
6 • 65-2322RK Oxygen Transmitter
Controller Detector/Transmitter
+
Terminals, Typical Designations
S
Cable Shield
Controller Housing
J-Box
S
SPAN
ZERO
SIG/PWR
TOXIC OXY
Green
White
Oxygen Detector
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.
Figure 4: Wiring the Oxygen Transmitter to a Controller
65-2322RK Oxygen Transmitter • 7
Start Up
This section describes procedures to start up the oxyg en tra nsmitter 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 pow er to the controller.
4. Turn on the controller.
5. Verify that the controller is on and operating properly. Refer to the controller
operator’s ma nual.
CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next
section, “Verifying/Setting the Fresh Air Reading”.
Verifying/Setting the Fresh Air Reading
WARN ING: Do not remove the detect or 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 oxygen 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.
8. Allow the gas to flow for two minutes.
9. Verify a voltmeter reading of 434 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until th e
voltmeter reading is 434 mV (±2 mV).
8 • 65-2322RK Oxygen Transmitter
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
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 oxygen transmitter. It includes daily, monthly, and quarterly
procedures.
Daily
the sample tubing connected to the regulator and the calibration cup.
Verify a display reading of 20.9% oxy gen at the controller. Investigate significant changes
in the display reading.
Monthly
This procedure describes a test to verify that the oxygen transmitter responds properly to
oxygen deficiency.
NOTE: Performing a response test on the oxygen transmitter may cause alarms. Be sure
to put the controller into its calibration mode or disable external alarms before
performing this test
Preparing for the response test
1. Place the controller into its calibration mode or disable external alarms.
2. Verify that the controller displa y reading fo r the cha nnel you are testing is 20.9%
oxygen.
If the display reading is not 20.9% oxygen, set the fresh air reading of the transmitter
as described in “Start Up” on page 8, then continue this procedure.
WARN ING: Do not remove the detect or 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.
3. Unscrew and remove the junction box cover.
4. Set a voltmeter to read in the millivolt (mV) range.
5. 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.
65-2322RK Oxygen Transmitter • 9
Performing the response test
1. Exhale into the bottom of the oxygen detector for a few seconds.
2. Stop exhaling into the bottom of the detector, then verify that the reading on the
voltmeter decreased from the normal reading, 434 mV.
NOTE: If the reading does not decrease, calibrate the detector as described in
“Calibration” on page 13.
3. Remove the voltmeter leads from the amplifier test points, then secure the junction
box cover to the junction box.
4. When the display reading rises above the decreasing alarm setpoint, return the
controller to normal operation.
Quarterly
Calibrate the oxygen transmitter as described in “Calibration” on page 13 of this manual.
See the calibration frequency discussion in “Calibration Frequency” on page 13 to
determine if a quarterly calibration schedule fits your needs.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the oxygen transmitter.
NOTE: This troubleshooting guide describes transmitter problems only. See the
controller operator’s manual for problems you may encounter with the
controller.
Table 2:Troubleshooting the Oxygen Transmitter
Condition Symptom(s) Probable Causes Recommended Action
Fail Condition • Controller indicates a
fail condition.
• The transmitter wiring
is disconnected or
misconnected.
• The plug-in sensor is
not properly plugged
into the sockets in the
detector housing body.
• The transmitter’s zero
reading is low enough
to cause a fail
condition.
• The transmitter is
malfunctioning.
1. Verify that the transmitter wiring is
correct and secure.
2. Confirm that the plug-in sensor is
installed properl y.
3. Perform a fresh air adjustment. A full
calibration is recommended
4. If the fail condition continues, replace
the plug-in sensor as described later
in this section.
5. If the fail condition continues, contact
RKI for further instruction.
10 • 65-2322RK Oxygen Transmitter
Table 2:Troubleshooting the Oxygen Transmitter (cont.)
Condition Symptom(s) Probable Causes Recommended Action
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Transmitter responds
slowly or does not
respond to response
test.
• Unable to accurately
set the fresh air or
zero 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 appr opriate
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 or replace 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 fresh
air adjustment if the environment is
suspect and 100% nitrogen (0%
oxygen) is normally used for a zero
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.
Replacing Components of the Oxygen Transmitter
This section includes a procedure to replace the plug-in oxygen sensor, a procedure to
replace the entire oxygen detector assembly, and one to replace the amplifier. In most
cases, it is not necessary to replace the entire detector assembly.
Replacing The Plug-in Oxygen Sensor
CAUTION: The plug-in sensor contains electrolyte that is an irritant. Do not disassemble the
sensor when replacing it with a new one. If 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 oxyge n sensor.
5. Carefully plug the replacement sensor into the socket pattern that is located in the
detector housing.
6. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
7. Turn on pow er to the controller.
8. Turn on the controller and place into normal operation.
CAUTION: Allow the replacem ent sens or to warm up for 5 minutes before you continue with the
next step.
9. Calibrate the detector as described in “Calibration” on page 13.
65-2322RK Oxygen Transmitter • 11
Replacing the Oxygen Detector
NOTE: In most cases, it is only necessary to replace the plug-in 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 en vironm e ntal 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 white wire to the terminal labelled Oxy + and the green wire to the
terminal labelled Oxy -. See Figure 4 on page 7 for the detector wiring connectio ns to
the amplifier.
9. Reinstall the detector terminal strip into its socket.
10. Reinstall the junction box cover.
11. Turn on or plug in power to the control ler.
12. Turn on the controller and place it into normal operation.
CAUTION: Allow the replacement detector to warm up for 5 minutes before y o u c o ntinue with
the next step.
13. Calibrate the replacement detector as described in “Calibration” on page 13.
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.
6. Remove the old amplifier.
7. Install the new amplifier in to the junction box with the screw, lock washer, and flat
washer you removed in Step 5 ab ove. A foa m 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 detector and controller terminals strips into their sockets on the new
amplifier as shown in Figu re 4 on page 7. If controller leads or detector leads were
removed during this procedure, refer to Figure 4 on page 7 for the detector and
12 • 65-2322RK Oxygen Transmitter
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.
9. Turn on pow er to the controller.
10. Turn on the controller and place it into normal operation.
11. Allow the transmitter to warm-up for 5 minutes.
12. Calibrate the transmitter as described in “Calibration” on page 13 of this manual.
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 oxygen transmi tter
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months for the oxygen
transmitter.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment, and calibration adjustments a re minima l at calibration, then a
calibration frequency of every 6 months is adequate.
Calibration
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.
This section describes how to calibrate the oxygen transmitter. It includes procedures to
prepare for calibration, set the fr esh air r eading, set the zero r eading, and return to normal
operation. It describes calibration 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.
Prepari ng for Ca libration
1. Place the controller into its calibration mode or disable external alarms.
WARN ING: Do not remove the detect or 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.
2. Unscrew and remove the junction box cover.
3. Set a voltmeter to measure in the millivolt (mV) range.
4. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the red + test point; plug the negative lead into the black - test point.
65-2322RK Oxygen Transmitter • 13
5. Use the following formula to determine the correct test points output for the
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
The concentration of oxygen in the atmosphere is 20.9%, so when setting the fresh air
reading, you will set the test points output to 434 mV (±2 mV).
434(mV) = (20.9/25) X 400 +100
NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
6. Screw the calibration cup onto the detector housing cap.
Setting the Fresh Air Reading
NOTE: If you can verify that the oxygen transmitter is in a fres h air envir onment, you do
not need to apply zero air to the detector before adjusting the fresh air 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 and verify a reading of 434 mV (±2 mV). If
necessary, use the span pot on the amplifier to adjust the reading to the correct value.
5. Turn the regulator knob clockwise to close the regulator.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the 100% nitrogen cylinder. If
necessary to fit the nitrogen cylinder, change the regulator.
Setting the Zero Reading
1. Screw the regulator into the 100% nitrogen calibration cylinder.
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the calibration gas to fl ow for two minutes and verify a reading of 100 mV (±2
mV). If necessary, use the zero 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 cylind er.
6. Unscrew the calibration cup from the detector housing cap.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
14 • 65-2322RK Oxygen Transmitter
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Secure the junction box cover to the junction box.
3. When the controller display reading rises above the decreasing alarm setpoint, return
the controller to normal ope r ation.
NOTE: If you do not allow the gas reading to increase above the decreasing alarm point,
then unwanted alarms may occur.
4. Verify that the controller dis p lay reading increases and stabilizes at 20.9% volume.
5. Store the components of the calibration kit in a safe and convenient place.
Parts List
Table 3 lists replacement parts and accessories f or the oxygen transmitter.
Table 3: Parts List
Part Number Description
06-1248RK -03 Calibration kit sampl e tubing, 3 fo ot length
07-0133RK Detector housing cap gask et
18-0400RK-01 Juncti on box with rubber spacers
57-1064RK-01 S2 series oxygen amplifier, w/orienting gasket, 0 - 25%
65-1025RK Oxygen plug-in sensor
65-2514RK Oxygen detector assembly, explosion proof, includes plug-in sensor
71-0157RK 65-2322RK Operator’s Manual (this document)
81-0076RK Zero air calibration cylinder, 17 liter steel
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0076RK-03 Zero air calibration cylinder, 103 liter steel
81-0078RK 100% nitrogen calibration cylinder, 17 liter steel
81-0078RK-01 100% nitrogen calibration cylinder, 34 liter steel
81-0078RK-03 100% nitrogen calibration cylinder, 103 liter steel
81-F301RK Calibration kit for oxygen detector head, 103 liter
81-F301RK-LV Calibration kit for oxygen detector head, 34 liter
81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17 liter and 34 liter steel calibration cylinders
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34AL/58/103 liter calibration cylinders
81-1117RK Calibration cup
65-2322RK Oxygen Transmitter • 15
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