RKI Instruments 65-2516RK User Manual

65-2516RK

Oxygen Transmitter

Operator’s Manual

Part Number: 71-0116RK
Revision: 0
Released: 3/1/11

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.

65-2516RK 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 a ny accident or damag e c au sed by the operatio n of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.

65-2516RK Oxygen Transmitter

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting the Oxygen Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring the Oxygen Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Setting the Fresh Air Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Replacing Components of the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

65-2516RK Oxygen Transmitter

Overview

!

This instruction manual describes the explosion proof capillary type oxygen transmitter.
This manual also describes how to insta ll, start up, configure, maintain, and calibrate the
transmitter when using it with a gas monito ring controller. A parts list at the end of this
manual lists replacement parts and accessories for the oxygen transm itter. See the
controller operator’s manual for informat ion specific to the controller.

Specifications

WARN ING: Do not use this product in a manner not specified in thi s instruction

Table 1 lists specifications for the oxygen transmitter.

manual.

Table 1: Specifications

Target Gas Oxygen (O
Area Classification Explosionproof 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).
Input Voltage 11 VDC - 30 VDC
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 25% volume
Accuracy ± 0.5% O

Oxygen Detector Signal Output 0 mV at 0% volume oxygen nominal

18 mV at 25% oxygen nominal
Response Time 90% in 30 seconds
Operating Temperature -20°C to 45°C

)

2

2

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 65-2516RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2516RK and to
minimize the risk of personal injury. Be sure to maintain and period ically
calibrate the 65-2516RK as described in this manual.

65-2516RK Oxygen T r an s mi t te r • 1

Description

g

I

nstalled On Oxygen

Detector Terminal

This section describes the components of the oxygen transmitter. The transmitter consists
of the oxygen detector, amplifier, and junction box.

3/4" NPT Conduit Openin

Test Point (-)

Factory Set

Potentiometer

Zero

Potentiometer

Span

Potentiometer

Jumper Block

Select Header

Strip

ZERO

SPAN

OXYGEN

TP

-

FB

Not

Used

4/20

POWER/SIG

SENSOR

OXY

Not

Used

W

+

TP

+

24V

G

For Wire Entry

Interconnect Terminal
Strip

Test Point (+)

Amplifier

Securing Screw (2X)

Detector
Housing

Detector Housing
Cap

Oxygen

Detector

Flame Arrestor
Guard

Figure 1: Oxygen Transmitt er Comp on ent Location

Oxygen Detector

The oxygen detector includes the detector housing and sensor.

Detector Housing

The detector housing protects the sensing components within the housing. Use the
mounting threads at the top of the housi ng to screw the oxygen detector into the bottom
conduit hub of the junction box. Use the removable cap near the bottom of the housing to
access the sensor for maintenance or replacement. The cap protects the sensor from
damage and includes a flame arrestor which contains any sparks wh ich may occu r withi n
the detector housing. A cap gasket seals the interface between the housing and cap. The
flame arrestor guard is permanently bonded to the cap.

Two wires extend from the top of the detector housing. Use these wires to connect the
oxygen detector to the amplifier . The housing includes sockets installed on a circuit board.
These sockets accept the sensor’s two pins to secure the sensor within the detector
housing. The circuit board with the sockets conditions the sensor’s signal before the signal
reaches the amplifier.

2 • 65-2516RK Oxygen Transmitt er

Sensor

The sensor is secured within the sensor housing by the two pins. Through a series of
chemical and electrical reactions, the sensor produces an electrical output that is
proportional to the detector range of the transmitter.

Amplifier

The amplifier converts the electrical output from the sensor to a 4 to 20 mA signal (that is
proportional to the detection range) and transmits the signal to a gas monitoring
controller. The amplifier includes the amplifier type selector, detector terminal strip,
interconnect terminal strip, span pot, zero pot, and test points (see Figure 1).

Amplifier Type Selector

The amplifier type selector is near the bottom left corner of the amplifier. It is to the left of
the detector terminal strip and below the span pot.

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 blo c k 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 to p of the
amplifier. Use the interconnect terminal strip to connect the amplifier to a controller.

Span Pot

The span pot is on the left side of the amplifier. Of the three pots, the span pot is bottom
most. Use the span pot to adjust the transmitter’s fresh air output during the start-up and
calibration procedures.

Zero Pot

The zero pot is above the span pot. Use the zero pot to adjust the transmitter’s oxygen-free
output during the calibration procedures.

CAUTION: The third potentiometer is factory-set. Do not adjust it.

Test Points

The test points (labeled TP- and TP+) are on the left and right side of the interconnect
terminal strip. The test points produce a 100 to 500 mV output that is proportional to the
transmitter’s 4 to 20 mA output. Use the test points and a voltme ter to mea sure the
transmitter’s output during the start-up and calibration procedures.

65-2516RK Oxygen T r an s mi t te r • 3

Installation

1

g

Junction Box

Use the junction box to install the oxyg en 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 mountin g 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 junct ion box.

This section describes procedures to mount the oxygen transmitter in the monitoring
environment and wire the transmitter to a gas monitoring 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.

CAUTION: Mount the ox ygen transmitter with the detector facing down (see Figure 2).

.25 Dia. Mountin
Hole, 2X

3/4 NPT
Conduit Hub

8.5 max

3.2
max

6.10

3.94

5.20

2.75

5.46

1 1/2-20 For
Calibration Cup

.10

Figure 2: Mounting the Oxygen Transmitter

4 • 65-2516RK Oxygen Transmitt er

NOTE: The oxygen detector used in this transmitter is normally provided with a Killark

HKB junction box and an HFC lid rated explosion pr oo f for Cl as s I, Gr o ups B, C,
and D. This combination is shown in Figure 2 above. Any junction box with an
internal volume less than or equal to 69 cubic inches and rated explosion proof
for Class I, Groups B, C, and D may be used for th is transmitter as long as the
amplifier will fit in it.

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.

Wiring the Oxygen Transmitter to a Controller

WARN ING: Always verify that the power source is OFF bef ore you make wiring

connections.

1. Turn off the controller.

2. Turn off or unplug incoming 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 detector leads to the detector terminal strip as shown in
Figure 3.

5. V er ify that the jumper block is installed over the Oxygen selector of the am pl if ier ty pe
selector as shown in Figure 3.

6. Guide a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the junction box.

WARN ING: 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.

7. 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 (or signal) wire to the terminal labeled 4/20 FB.

CAUTION: If using shielded cable, leave the drain wire insulated and disconne cted at the

transmitter. You will connect the opposite end of the cable’s drain wire at the
controller.

8. Secure the junction box cover to the junction box.

9. 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 conduit hub. The

power cable may disrupt the transmission of the tran smitter signal to t he controller.

65-2516RK Oxygen T r an s mi t te r • 5

10. Connect the wires to the to the applicable controller transmitter terminal strip as

er

shown in Figure 3.

4 - 20 mA In
(FB or S)

+ 24 VDC

Cable Shield

Controller Transmitt

FB

+

4/20

W

OXY

24V

TP

+

G

Terminals,Typical

ZERO

SPAN

OXYGEN

TP

-

Not

Used

POWER/SIG

SENSOR

Not

Used

Green

White

Figure 3: Wiring the Oxygen Transmitter to a Controller

11. 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.

6 • 65-2516RK Oxygen Transmitt er

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 or plug in the incoming power to the controller, then turn on the control ler.

4. 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, “Setting the Fresh Air Signal”.

Setting the Fresh Air Signal

WARN ING: Do not remove the detector housing cap or junction box cover while the

circuits are energized unless the area is deter mined t o 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. Verify that the transmitter area is non-hazardous.

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 ne gative lead into the test point labeled TP-.

5. Screw the calibration cup onto the bottom of the detector.

6. Screw the regulator into the zero air calibration cylinder.

7. Use the sample tubing to connect the regulator to the calibration cup.

8. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.

9. Allow the gas to flow for 2 minutes.

10. Verify a voltmeter reading of 434 mV (±2 mV).

11. If necessary, use a flat-blade screwdriver to adjust the span pot until the voltmeter
reading is 434 mV (±2 mV).

65-2516RK Oxygen T r an s mi t te r • 7

12. Turn the regulator’s on/off knob clockwise to close it.

13. Unscrew the calibration cup from the detector.

14. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave

15. Store the components of the calibration kit in a safe and conve nient place.

16. Remove the voltmeter leads from the test points.

17. 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% 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 befor e
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 7 of this man ual , then conti n ue this pr o c edure.

2. Set a voltmeter to measure in the millivolt (mV) range.

WARN ING: Do not remove the detector housing cap or junction box cover while the

circuits are energized unless the area is deter mined t o be non-hazardous.
Keep the detector housing cap and junction box cover tightly closed during
operation.

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.

2. Stop exhaling into the bottom of the detector, then verify that the reading on the

8 • 65-2516RK Oxygen Transmitt er

voltmeter decreased from the normal reading (434 mV).

NOTE: If the reading does not decrease, calibrate the transmitter as described in

“Calibrati on” on page 13 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 detector as described in “Calibration” on page 13. See the calibration
frequency discussion in the calibration section to d etermine 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

Slow or No
Response/
Difficult or
Unable to
Calibrate

fail condition.

• 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 mont hs.

Some applications may
require a more freque nt
calibration schedule.

• The transmitter wiring
is disconnected or
misconnected.

• The transmitter is
malfunctioning.

• 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 transmitter is
malfunctioning.

1. Verify that the transmitter wiring is
correct and secure.

2. Calibrate the transm itt er.

3. If the fail condition continues, replace
the oxygen sensor.

4. If the fail condition continues, contact
RKI for further instruction.

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. If the calibration/response difficulties
continue, replace the oxygen sensor.

4. If the calibration/response difficulties
continue, contact RKI for further
instructions.

65-2516RK Oxygen T r an s mi t te r • 9

Replacing Components of the Oxygen Transmitter

This section includes procedures to replace the oxygen sensor 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 Oxygen Sensor

1. Turn off the controller.

2. Turn off or unplug incoming power to the controller.

3. Unscrew the detector housing cap from the detector housing.

4. Unplug and remove the oxyge n sensor.

5. Carefully plug the replacement sensor into the socket pattern that is located in the top
section of the detector housing.

NOTE: Match the sensor’s male pins with the two female sockets as you plug the sensor

into the socket.

6. Screw the detector housing cap onto the detector housing.

7. Turn on or plug in incoming power to the controller.

8. Turn on the controller.

CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the

next step.

9. Calibrate the replacement sensor as described in the Calibration section of this
manual.

Replacing the Amplifier

1. Turn off the controller.

2. Turn off or unplug incoming power to the controller.

3. Remove the junction box cover.

4. Disconnect the detector leads from the detector terminal strip.

5. 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.

6. Remove the amplifier.

7. Place the new amplifier in the same position as the old amplifier.

8. Use the two screws you removed in step 5 to secure the new amplifier to the junction
box.

9. Verify that the jumper block is installed over the OXYGEN selector of the amplifie r
type selector as shown in Figure 3.

10 • 65-2516RK Oxygen Transmit ter

10. Reconnect the wiring from the controller to the interconnect terminal strip as shown
in Table 3 and Figure 3.

Table 3: Reconnecting the Oxygen Amplifier to a Controller

Amplifier

Interconnect Terminal

Strip

Controller Transmitter

Terminal Strip (typical)

4/20 FB 4 -20 (FB)

24V + + V (11 - 30 VDC)

11. Reconnect the detector leads to the detector terminal strip as shown in Table 4 a nd
Figure 3.

Table 4: Reconnecting the Oxygen Detector to the Amplifier

Amplifier

Oxygen Detector Lead

Interconnect Terminal

Strip

White OXY W
Green OXY G

12. Reinstall the junction box cover.

13. Turn on or plug in incoming power to the controller.

14. Turn on the controller.

CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with th e next

step.

15. Calibrate the oxygen transmitter as described in the Calibration section of this
manual.

Replacing the Oxygen Detect or

NOTE: In most cases, it is only necessary to replace the oxygen sensor.

1. Turn off the controller.

2. Turn off or unplug incoming 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.

65-2516RK Oxygen T ra n sm i tt er • 11

7. Connect the detector leads to the detector terminal strip as shown in Table 4 and
Figure 3.

Table 5: Connecting the Replacement Oxygen Detector to the Amplifier

Amplifier

Oxygen Detector Lead

White OXY W
Green OXY G

8. Reinstall the junction box cover.

9. Turn on or plug in incoming power to the controller.

10. Turn on the controller.

CAUTION: Allow the replacement detector to warm up for 5 minutes before y o u c o ntinue with

the next step.

11. Calibrate the replacement detector as described in “Calibration” on page 13.

12. Secure the junction box cover to the junction box.

Interconnect Terminal

Strip

Calibration Frequency

Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for mo st applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months (quarterly).

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.

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.

12 • 65-2516RK Oxygen Transmit ter

Calibration

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 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.

Prepari ng for Ca libration

NOTE: Calibrating the oxygen transmitter may cause alarms. Be sure to put the

controller into its calibration program or disable external alarms before
continuing.

1. Unscrew and remove the junction box cover.

2. Set a voltmeter to measure in the millivolt (mV) range.

WARN ING: Do not remove the detector housing cap or junction box cover while the

circuits are energized unless the area is deter mined t o be non-hazardous.
Keep the detector housing cap and junction box cover tightly closed during
operation.

3. Plug the positive lead into the test point labeled TP+; plug the negative lead into the
test point labeled TP-.

4. Screw the calibration cup onto the detector housing.

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 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’s on/off knob counterclockwise to open it.

4. Allow the gas to flow for 2 minutes.

5. Verify a voltmeter reading of 434 mV (±2 mV).

6. If necessary, use a flat-bla de screwdriver to adjust the span pot on the amplifier unt il
the voltmeter reading is 434 mV (±2 mV).

7. Turn the regulator on/off knob clockwise to close it.

8. Unscrew the regulator from the zero air calibration cylinder.
Leave the sample tubing connected to the regulator and the calibration cup.

Setting the Zero Reading

1. Screw the regulator into the 100% nitrogen calibration cylinder.

2. Turn the regulator’s on/off knob counterclockwise to open it.

3. Allow the gas to flow for two minutes and verify a reading of 100 mV (±2 mV).

4. If necessary, use the zero pot on the amplifier to adjust the reading to 100 mV (±2 mV).

65-2516RK Oxygen T ra n sm i tt er • 13

5. Turn the regulator’s on/off knob clockwise to close it.

6. Unscrew the regulator from the calibration cylind er.

7. Unscrew the calibration cup from the oxygen detector.

NOTE: For convenience, leave the components of the calibration kit connected by the

sample tubing.

Returning to Normal Operation

1. Remove the voltmeter leads from the am plif ier test points.

2. Secure the junction box cover to the junction box.

3. When the display reading rises above the decreasing alarm setpoint, return the
controller to normal operation.

NOTE: If you do not allow the oxygen reading to increase above the decreasing alarm

point, then unwanted alarms may occur.

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.

14 • 65-2516RK Oxygen Transmit ter

Parts List

Table 5 lists replacement parts and accessories for the oxygen transmitter.

Table 6: Parts List

Part Number Description

06-1248RK Sample tubing (order by the foot)
07-0033RK Detector housing cap gasket
18-0405RK-01 Junction box (without cover; pre drilled for amplifier)
18-0406RK Junction box cover
57-1062RK Amplifier for oxy gen tra nsmitter
65-1025RK Oxygen replacement sensor, plug-in
65-2514RK Oxygen replacement detector assembly (includes sensor), CSA clas-

sified

65-2516RK Oxygen transmitter (includes detector and amplifier), CSA classi-

fied
71-0116RK Oxygen Transmitter Operator’s Manual (this document)
81-F301RK-LV Calibration kit, 34 liter
81-0076RK-01 Zero air calibration cylinder (34 liter)
81-0078RK Calibration cylinder (100% nitrogen, 17-liter)
81-0078RK-01 Calibration cylinder (100% nitroge n ; 34-liter)
81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17- and 34-liter steel

81-1117RK Calibration cup

calibration cylinders

65-2516RK Oxygen T ra n sm i tt er • 15