RKI Instruments 65-2320RK User manual

65-2320RK
Oxygen Transmitter
Operator’s Manual
Part Number: 71-0173RK
Revision: A
Released: 7/3/14
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65-2320RK Oxygen Transmitter
WARNING
Read and understand this instruction manual before operating
detector. Improper use of the detector could result in bodily harm
or death.
Periodic calibration and maintenance of the detector is essential
for proper operation and correct readings. Please calibrate and
maintain this detector regularly! Frequency of calibration
depends upon the type of use you have and the sensor types.
Typical calibration frequencies for most applications are between
3 and 6 months, but can be required more often or less often
based on your usage.
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65-2320RK 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 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
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65-2320RK Oxygen Transmitter
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mounting the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Wiring the Oxygen Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Verifying/Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Replacing Components of the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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65-2320RK Oxygen Transmitter • 1
Overview
This instruction manual describes the 65-2320RK 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. 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 information specific to the controller.
Specifications
Table 1 lists specifications for the oxygen transmitter.
WARNING: When using the 65-2320RK, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2320RK and to
minimize the risk of personal injury. Be sure to maintain and periodically
calibrate the 65-2320RK as described in this manual.
Table 1: Specifications
Target Gas Oxygen
Sampling Method Diffusion
Detection Range 0 to 25%
Signal Output 4 to 20 mA
Response Time 90% in 30 seconds
Accuracy ± 0.5% O2
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2 • 65-2320RK Oxygen Transmitter
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.
Figure 1: Oxygen Transmitter Component Location
Oxygen Detector
The sensing components of the detector are encapsulated within a conduit mounting
black anodized aluminum housing. Through a series of chemical and electronic reactions,
the detector produces a millivolt output that is proportional to the detection range. 3/4’’
NPT mounting threads at the top of the detector allow you to mount the detector to the
junction box or a 3/4’’ NPT conduit fitting. Two color-coded leads extend from the top of
the detector. The leads allow you to connect the detector to a controller.
Controller Terminal Strip
- Test Point (Black)
100mV - 500mV
Range
TOXIC OXY SIG/PWR
S
Amplifier
Detector Terminal Strip
ZERO
SPAN
Zero Pot
Factory Adjust Pot
+ Test Point (Red)
Span Pot
J-Box
Oxygen Detector
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65-2320RK 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 strip located at the
top edge of the amplifier. Use the controller terminal strip to wire the amplifier to a
controller.
Detector Terminal Strip
The detector terminal strip is a four position plug-in style terminal strip located below the
controller terminal strip. Two of the positions are for use with a toxic gas detector and are
not used in the oxygen transmitter. Use the two detector terminal strip 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 5 for all wiring procedures related
to the transmitter.
Zero Pot
The zero pot is located in the upper left corner of the amplifier (see Figure 1). Use a small
flat blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s
zero (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 counterclockwise 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 start-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’’ conduit hub to connect wiring from the amplifier to the
controller. Use the cover on the front 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
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4 • 65-2320RK Oxygen Transmitter
from a mounting surface and ensure that there is enough room to install a calibration cup
on the detector during calibration.
Installation
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.
Figure 2: Mounting the Oxygen Transmitter
2. At the monitoring site you select, hang or mount the junction box with the detector
facing down (see Figure 2).
.38
.75
3.65
3/4 NPT
Female
1 1/2-20 Thread
for Calibration Cup
Oxygen
Detector
J-Box
2.74
.10
Rubber
Spacer, 3X
7.9 MAX
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65-2320RK Oxygen Transmitter • 5
Wiring the Oxygen Transmitter to a Controller
WARNING: 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 3.
5. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by
grasping the terminal strip and pulling. The detector terminal strip is keyed so that
the controller and detector terminal strips cannot be reversed inadvertently.
6. Guide either a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the junction box.
7. Pull out the controller terminal strip, and connect the two wires to the terminal strip
as follows (see Figure 3).
• 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 cable may disrupt the transmission of the transmitter signal to the
controller.
11. Connect the wires to the applicable detector/transmitter terminal strip at the
controller as shown in Figure 3.
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6 • 65-2320RK Oxygen Transmitter
Figure 3: Wiring the Oxygen Transmitter to a Controller
12. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
ground at the controller. RKI controllers typically have a ground stud that can be used
to ground the cable’s drain wire.
Controller Detector/Transmitter
Terminals, Typical Designations
+
S
Cable Shield
SPAN
J-Box
Controller Housing
ZERO
TOXIC OXY SIG/PWR
S
White
Green
Oxygen Detector
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