RKI Instruments 65-2507RK User manual

RKI Instruments, Inc. • 33248 Central Ave • Union City, CA 94587 • 510-441-5656
65-2507RK
OxygenTransmitter
Operator’s Manual
Part Number: 71-0080RK
Revision: 0
Released: 12/6/2002

65-2507RK Oxygen Transmitter • 2
Product Warranty
RKI Instruments, Inc., warranties gas alarm equipment sold by us to be free from defects
in materials, workmanship, and performance for a period of one year from date of
shipment from RKI Instruments, Inc. Any parts found defective within that period will be
repaired or replaced, at our option, free of charge. This warranty does not apply to those
items which by their nature are subject to deterioration or consumption in normal service,
and which must be cleaned, repaired, or replaced on a routine basis. Examples of such
items are:
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty indicates
the full extent of our liability, and we are not responsible for removal or replacement costs,
local repair costs, transportation costs, or contingent expenses incurred without our prior
approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,
AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF
RKI INSTRUMENTS, INC., INCLUDING BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC., BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF
ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR
OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors,
dealers, and representatives as appointed by RKI Instruments, Inc.
We do not assume indemnification for any accident or damage caused by the operation of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses

65-2507RK Oxygen Transmitter • 3
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting the Oxygen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring the Oxygen Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting the Fresh Air Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacing Components of the Oxygen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Assembling the Calibration Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

65-2507RK Oxygen Transmitter • 4
Overview
This instruction manual describes the oxygen transmitter. This manual also describes how
to install, start up, configure, maintain, and calibrate the transmitter when using it with a
gas monitoring controller. Aparts list at the end of this manual lists replacement parts and
accessories for the oxygen transmitter. See the operator’s manual for the controller for
information specific to the controller.
Specifications
Table 1 lists specifications for the oxygen transmitter.
Table 1: Specifications
Description Specification
Target Gas Oxygen (O
2
)
Area Classification Explosionproof for Class I, Groups B, C, and D
Sampling Method Diffusion
Signal Output 4 - 20 mA
Detection Range 0 to 25.0% VOL (by volume)
Response Time 90% in 30 seconds

65-2507RK Oxygen Transmitter • 5
Description
This section describes the components of the oxygen transmitter. The transmitter consists
of the oxygen detector, amplifier, and junction box.
Figure 1: OxygenTransmitter Component Location
Oxygen Detector
The oxygen detector includes the oxygen sensor, detector housing, and detector leads.
Oxygen sensor
The oxygen sensor is encapsulated within the detector housing. Through a series of
chemical and electronic reactions, the sensor produces an electrical output that is
proportional to the detection range of the transmitter. The oxygen sensor used is a
capillary type that is not susceptible to output changes with changes in atmospheric
pressure.
Detector housing
The oxygen sensor is encapsulated within the detector housing. Mounting threads
(3/4 in. NPT) at the top of the detector housing allow you to mount the oxygen detector
into the bottom conduit hub of the junction box.
Detector leads
Two color-coded leads extend from the top of the detector. The leads allow you to connect
the oxygen detector to the amplifier.
Oxygen detector
Test point (+)
Test point (-)
Zero potentiometer
Span potentiometer
Securing screw (2)
Oxygen amplifier
Amplifier type
selector
OXYGEN
ZERO
SPAN
Potentiometer
(factory-set)
Interconnect
terminal strip
BATT
-
+
4/20
FB +
24V
POWER/SIG
Detector
terminal strip
TOXIC
RD BK
OXY
WG
SENSOR
TP
-TP
+

65-2507RK Oxygen Transmitter • 6
Amplifier
The amplifier converts the electrical output from the oxygen detector to a 4 - 20 mAsignal
that is proportional to the detection range and transmits the signal to the controller. The
amplifier includes the amplifier type selector, detector terminal strip, interconnect
terminal strip, span potentiometer, zero potentiometer, and test points (see Figure 1).
Amplifier type selector
The amplifier type selector is near the bottom left corner of the amplifier. It is below the
span potentiometer and to the left of the detector terminal strip.
The amplifier included with the oxygen transmitter is designed for use with RKI’s oxygen
and toxic gas transmitters. The amplifier type selector determines for which transmitter
the amplifier is intended. For oxygen transmitters, a jumper block is installed over the
OXYGEN selector (see Figure 1).
Detector terminal strip
The detector terminal strip is the four-point terminal strip near the bottom of the
amplifier. Use the detector terminal strip to connect the oxygen detector to the amplifier.
NOTE: The oxygen detector is factory-wired to the amplifier. See the Installation section
of this manual for all wiring procedures related to the transmitter.
Interconnect terminal strip
The interconnect terminal strip is the four-point terminal strip near the top of the
amplifier. Use the interconnect terminal strip to connect the amplifier to the controller.
Span potentiometer
The span potentiometer is on the left side of the amplifier. Of the three potentiometers, the
span potentiometer is closest to the bottom of the amplifier. Use the span potentiometer to
adjust the transmitter’s response output during the start-up and calibration procedures.
Zero potentiometer
The zero potentiometer is directly above the span potentiometer. Use the zero
potentiometer to adjust the transmitter’s oxygen-free output during the start-up and
calibration procedure.
CAUTION: The amplifier includes an additional potentiometer above the zero potentiometer.
It is factory-set. Do not adjust it.
Test points
The test points (labeled TP- and TP+ ) are directly to the left and right of the interconnect
terminal strip. The test points produce a 100 - 500 mV output that is proportional to the
transmitter’s 4 - 20 mA output. Use the test points and a voltmeter to measure the
transmitter’s output during the start-up and calibration procedures.

65-2507RK Oxygen Transmitter • 7
Junction Box
Use the junction box to install the oxygen transmitter at a mounting site that is remote
from the controller. The junction box also protects the amplifier and wiring connections
made to the amplifier. Use the two 3/4 in. conduit hubs to mount the detector to the
junction box (bottom hub) and connect wiring from the amplifier to the controller
(top hub).
NOTE: The oxygen detector and amplifier are factory-mounted to the junction box.
Use the junction box’s two mounting holes to mount the oxygen transmitter to a vertical
surface at the monitoring site. Use the cover on the front of the junction box to access the
interior of the junction box.

65-2507RK Oxygen Transmitter • 8
Installation
This section describes procedures to mount the oxygen transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the OxygenTransmitter
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.
CAUTION: Mount the oxygen transmitter with the detector facing down (see Figure 2).
2. At the monitoring site, use #10 screws through the junction box’s two mounting holes
to secure the junction box to a vertical surface (see Figure 2).
Figure 2: Mounting the OxygenTransmitter
2.4 in.
(6.1 cm)
Note: The junction box is
4.6 in. (11.7 cm) deep.
5.2 in.
(13.2 cm)
7.8 in. (max.)
(19.8 cm)
5.46 in.
(13.9 cm)
2.75 in.
(7.0 cm)
0.25 in.
DIA.

65-2507RK Oxygen Transmitter •9
Wiring the OxygenTransmitter to a Controller
WARNING: Always verify that the controller is off and 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. Verify that the detector leads are wired to the amplifier’s detector terminal strip. If
necessary, connect the leads to the detector terminal strip as shown in Figure 3.
5. Verify that the jumper block is installed over the OXYGEN selector of the amplifier
type selector as shown in Figure 3.
6. Install an appropriate cable bushing or conduit fitting on the top conduit hub of the
junction box.
7. Guide a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the junction box.
8. Connect the two wires to the interconnect terminal strip as follows (see Figure 3.)
• Connect the positive wire to the terminal labeled 24V + .
• Connect the feedback wire to the terminal labeled 4/20 FB .
CAUTION: Leave the cable drain (shield) wire insulated and disconnected at the transmitter. You
will connect the opposite end of the cable’s drain wire at the controller.
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.
CAUTION: Do not route power and transmitter wiring through the same conduit hub. The
power cable may disrupt the transmission of the transmitter signal to the
controller.

65-2507RK Oxygen Transmitter •10
11. Connect the wires to the applicable transmitter terminal strip at the controller as
shown in Figure 3.
Figure 3: Wiring the OxygenTransmitter to a Controller
12. At the controller, connect the cable’s drain wire to an available chassis ground.
OXY
Controller or Recording Device
(typical)
(11 VDC - 30 VDC) +
4 - 20 mA In (FB)
G
TOXIC OXY
W
RD BK
BATT 4/2024V
ZERO
SPAN
FB
Not
Used
OxygenDetector
FactoryWired
Green
White
Jumper Block
Installed on Oxygen
Select Header
Factory Set Pot

65-2507RK Oxygen Transmitter •11
Start Up
This section describes procedures to start up the oxygen transmitter and place the
transmitter into normal operation with a controller.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring is correct and secure. Refer to the controller instruction
manual for connections at the controller.
3. Turn on or plug in the incoming power at the power source end, then turn on the
controller.
4. Verify that the controller is on and operating properly. Refer to the controller
instruction manual.
Setting the Fresh Air Signal
CAUTION: If you suspect the monitoring environment is not of normal oxygen content (20.9%),
use the calibration kit and the zero air calibration cylinder to introduce “fresh air” to
the sensor and verify an accurate normal setting.
1. Verify that the transmitter is in a fresh air environment (environment known to be free
of toxic and combustible gasses and of normal oxygen content, 20.9%).
2. Unscrew and remove the junction box cover from the junction box.
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 test point labeled TP+ ; plug the negative lead into the test point labeled TP- .
5. Verify a voltmeter reading of 434 mV (±2 mV).
6. If necessary, use a flat-blade screwdriver to adjust the span potentiometer until the
voltmeter reading is 434 mV (±2 mV).
7. Secure the junction box cover to the junction box.

65-2507RK Oxygen Transmitter •12
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
Verify a display reading of 20.9% oxygen at the controller. Investigate significant changes
in the 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 program or disable external alarms before
performing this test
Preparing for the response test
1. Verify that the display reading for the channel 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 11 of this manual, then continue this procedure.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier. Plug the positive lead into the test point labeled TP+ ; plug the negative
lead into the test point labeled TP- .
Performing the response test
1. Exhale into the bottom of the oxygen detector housing.
2. Stop exhaling into the bottom of the detector, then verify that the readings on the
voltmeter decreased from the normal reading (434 mV).
NOTE: If the reading does not decrease, calibrate the affected transmitter as described in
“Calibration” on page 16 of this manual.
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 16 of this manual.

65-2507RK Oxygen Transmitter •13
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 instruction manual for problems you may encounter with the
controller.
Table 2:Troubleshooting the OxygenTransmitter
Condition Symptom(s) Probable Causes Recommended Action
Fail Condition •Controllerindicatesa
fail condition. •The transmitter wiring is disconnected or
misconnected.
•The transmitter is
malfunctioning.
1. Verify that the transmitter wiring is
correct and secure.
2. Calibrate the transmitter.
3. If the fail condition continues, replace
the oxygen sensor.
4. If the fail condition continues, contact
RKI for further instruction.
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
three months.
Some applications may
require a more frequent
calibration schedule.
•Thecalibrationcylinder
is low, out-dated, or
defective.
•The transmitter is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. If the calibration/response difficulties
continue, replace the oxygen sensor.
3. If the calibration/response difficulties
continue, contact RKI for further
instruction.

65-2507RK Oxygen Transmitter •14
Replacing Components of the OxygenTransmitter
This section includes procedures to replace the oxygen detector and amplifier.
Replacing the oxygen detector
1. Turn off the controller
2. Turn off power to the controller.
3. Remove the junction box cover.
4. Disconnect the detector leads from the detector terminal strip. Note the position of the
color-coded leads as you remove them.
5. Unscrew the detector from the junction box.
6. 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.
7. Connect the detector leads to the amplifier’s detector terminal strip as shown in
Table 3 below and Figure 3 on page 10 of this manual.
8. Turn on power to the controller
9. Turn on the controller.
10. Calibrate the replacement detector as described in “Calibration” on page 16 of this
manual.
Replacing the amplifier
1. Turn off the controller
2. Turn off power to the controller.
3. Remove the junction box cover.
4. Disconnect the detector leads from the detector terminal strip.
5. Disconnect the wiring that connects the oxygen transmitter to the controller from the
amplifier’s interconnect terminal strip.
6. Unscrew and remove the two screws that secure the amplifier to the junction box.
The screws are at the top left and bottom right of the amplifier.
7. Remove the amplifier.
8. Place the new amplifier in the same position as the amplifier you removed in the
previous step.
9. Use the two screws you removed in step 5 to secure the amplifier to the junction box.
Table 3: Reconnecting the Oxygen Detector
to the Amplifier
Detector Lead DetectorTerminal
Strip
White OXY W
Green OXY G

65-2507RK Oxygen Transmitter •15
10. Reconnect the wiring that connects the controller and oxygen transmitter to the
amplifier’s interconnect terminal strip as shown in Table 4 below and Figure 3 on
page 10 of this manual.
11. Reconnect the detector leads to the amplifier’s detector terminal strip as shown in
Table 5 below and Figure 3 on page 10 of this manual.
12. Turn of power to the controller
13. Turn on the controller.
14. Calibrate the oxygen transmitter as described in “Calibration” on page 16 of this
manual.
Table 4: Reconnecting the Oxygen Amplifier
to the Controller
Amplifier
Interconnect
Terminal Strip
Controller
Transmitter Terminal
Strip
4/20 4 - 20 (FB)
24V + (11 VDC - 30VDC)
Table 5: Reconnecting the Oxygen Detector
to the Amplifier
Detector Lead DetectorTerminal
Strip
White OXY W
Green OXY G

65-2507RK Oxygen Transmitter •16
Calibration
This section describes how to calibrate the oxygen transmitter. It includes procedures to
set the fresh air reading, assemble the calibration kit, set the zero reading, and return to
normal operation.
NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the
controller into its calibration program or disable external alarms before
continuing.
Setting the Fresh Air Reading
1. Place the controller into its calibration program or disable external alarms.
2. Verify that the oxygen transmitter is in a fresh air environment (environment known
to be free of toxic and combustible gasses and of normal oxygen content, 20.9%).
3. Set a voltmeter to measure in the millivolt (mV) range.
4. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier.
Plug the positive lead into the test point labeled
TP+ ; plug the negative lead into the
test point labeled TP- .
5. Verify a voltmeter reading of 434 mV (±2 mV).
6. If necessary, use a flat-blade screwdriver to adjust the span potentiometer on the
amplifier until the voltmeter reading is 434 mV (±2 mV).
Assembling the Calibration Kit
1. Slide the calibration cup over the bottom of the oxygen detector, then secure the
calibration cup to the detector with the thumb screw.
2. Connect one end of the sample tubing to the regulator.
3. Connect the opposite end of the sample tubing to the calibration cup.
NOTE: Do not screw the regulator into the calibration cylinder at this time.
Setting the Zero Reading
1. Screw the regulator into the 100% nitrogen calibration cylinder.
2. When the reading on the voltmeter stabilizes, verify a reading of 100 mV (±2 mV).
3. If necessary, use the zero potentiometer on the amplifier to adjust the reading to
100 mV (±2 mV).
4. Unscrew the regulator from the calibration cylinder.
5. Remove the calibration cup from the oxygen detector.
NOTE: For convenience, leave the components of the calibration kit connected by the
sample tubing.

65-2507RK Oxygen Transmitter •17
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Secure the junction box cover to the junction box.
NOTE: If the oxygen reading is below the decreasing alarm setpoint when you return to
normal operation, the controller will initiate the appropriate alarm condition.
3. When the display reading rises above the decreasing alarm setpoint, return the
controller to normal operation.
4. Verify that the display 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 6 lists replacement parts and accessories for the oxygen transmitter.
Table 6: Parts List
Part Number Description
06-1248RK Sample tubing (3/16 in. x 5/16 in.; specify length when ordering)
18-0405RK-01 Junction box (does not include lid)
18-0406RK Junction box lid
57-1061RK Amplifier (specify target gas when ordering)
65-2506RK Oxygen detector, capillary type, conduit-mounting
65-2507RK Oxygen transmitter (includes detector and amplifier)
71-0080RK Oxygen Transmitter Operator’s Manual (this document)
81-0076RK-01 Zero air calibration cylinder (34 liter)
81-0078RK Calibration cylinder (100% nitrogen, 17-liter)
81-0078RK-01 Calibration cylinder (100% nitrogen; 34-liter)
81-1003RK Regulator, 0.5 liter/minute; continuous flow
(for 17- and 34-liter calibration cylinders)
81-1111RK Calibration cup