RKI Instruments CT-7 Series User manual

www.rkiinstruments.com
65-2302/65-2303
CT-7 Series
Toxic Detector
Operator’s Manual
Part Number: 71-0422
Revision: H
Released: 6/24/21

2 • 65-2302/65-2303 Toxic Detector
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.

65-2302/65-2303 Toxic Detector • 3
Product Warranty
RKI Instruments, Inc. warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year from date of shipment from
RKI Instruments, Inc. Any parts found defective within that period will be repaired or
replaced, at our option, free of charge. This warranty does not apply to those items which by
their nature are subject to deterioration or consumption in normal service, and which must be
cleaned, repaired, or replaced on a routine basis. Examples of such items are:
Warranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty indicates the
full extent of our liability, and we are not responsible for removal or replacement costs, local
repair costs, transportation costs, or contingent expenses incurred without our prior approval.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED, AND ALL
OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF RKI INSTRUMENTS,
INC. INCLUDING BUT NOT LIMITED TO, THE WARRANTY OF
MERCHANTABILITY OR FITNESS FOR 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

4 • 65-2302/65-2303 Toxic Detector
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
65-2302 Toxic Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Mounting the Toxic Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring the Toxic Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting the Zero (Fresh Air) Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacing Components of the Toxic Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Special Note About Calibrating a ClO2Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Setting the Zero (Fresh Air) Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Response Reading (Span) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

65-2302/65-2303 Toxic Detector • 5
Overview
This manual describes the 65-2302 and 65-2303 toxic detectors. This manual also describes
how to install, start up, maintain, and calibrate the toxic detector when used with a gas
monitoring controller. A parts list at the end of this manual lists replacement parts and
accessories for the toxic detector.
The 65-2303 toxic detector includes the 65-2302 toxic detector and a junction box.
The 65-2302 toxic detector does not include a junction box and is normally mounted in one of
a controller’s conduit hubs. If you are using a 65-2302 toxic detector, disregard all references
to the junction box and junction box terminal strip.
The 65-2302 and 65-2303 detectors can be used for various target gases which are listed in
Table 1 below.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1: Specifications
Target Gas and
Detection Range
Ammonia (NH3) 0 - 75 ppm • 65-2302-NH3-75
• 65-2303-NH3-75
Ammonia (NH3) 0 - 100 ppm • 65-2302-NH3-1
• 65-2303-NH3-1
Ammonia (NH3) 0 - 200 ppm • 65-2302-NH3-2
• 65-2303-NH3-2
Ammonia (NH3) 0 - 500 ppm • 65-2302-NH3-5
• 65-2303-NH3-5
Chlorine (Cl2) 0 - 3.00 ppm • 65-2302-CL2-3
• 65-2303-CL2-3
Chlorine (Cl2) 0 - 5.00 ppm • 65-2302-CL2-5
• 65-2303-CL2-5
Chlorine (Cl2) 0 - 10.0 ppm • 65-2302-CL2-10
• 65-2303-CL2-10
Chlorine Dioxide (ClO2) 0 - 1.00 ppm • 65-2302-CLO2-1
• 65-2303-CLO2-1
Chlorine Dioxide (ClO2) 0 - 3.00 ppm • 65-2302-CLO2-3
• 65-2303-CLO2-3
Chlorine Dioxide (ClO2) 0 - 5.00 ppm • 65-2302-CLO2-5
• 65-2303-CLO2-5
Hydrogen Cyanide (HCN) 0 - 15 ppm • 65-2302-HCN-15
• 65-2303-HCN-15

6 • 65-2302/65-2303 Toxic Detector
WARNING: When using the 65-2302/65-2303, you must follow the instructions and
warnings in this manual to assure proper and safe operation of the 65-2302/
65-2303 and to minimize the risk of personal injury. Be sure to maintain and
periodically calibrate the 65-2302/65-2303 as described in this manual.
Description
This section describes the components of the 65-2302 and 65-2303. The 65-2303 includes the
65-2302 toxic detector and a junction box. The 65-2302 does not include a junction box.
Figure 1 below shows the components of the 65-2303.
Sampling Method Diffusion
Accuracy ± 10% of reading or ± 5% of full scale (whichever is greater)
Response Time T90 in 60 seconds
Operating Temperature &
Humidity
-4°F to 104°F (-20°C to 40°C)
Table 1: Specifications
3/4 NPT Conduit Hub
Junction Box
Detector
Figure 1: 65-2303 Component Location

65-2302/65-2303 Toxic Detector • 7
65-2302 Toxic Detector
The 65-2302 toxic detector consists of the detector housing body, detector housing cap, cap
gasket, and the plug-in sensor.
Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the detector into a 3/4 NPT hub. Two
wires extend from the top of the detector housing body. Use these wires to connect the
detector to a controller. One of the wires is black and one of the wires is color-coded
depending on the detector type. See Figure 4 on page 10 for the color code assignments.
The housing body includes a four-socket pattern at the bottom of the housing body. The plug-
in sensor mates to this socket pattern. A pre-amplifier located between the sockets and the two
wires conditions the sensor’s signal before the signal reaches the controller. Each plug-in
sensor type (Cl2for example) requires a different pre-amplifier, so there is a different detector
housing body for each gas type.
Housing Cap and Cap Gasket
The housing cap screws onto the detector housing. It retains the sensor and protects it from
damage. A foam gasket inside the housing cap seals against the face of the sensor when the
cap is screwed on the housing body. Unscrew the detector cap to access the sensor for
replacement. A cap gasket seals the interface between the housing and cap.
Plug-in Sensor
The plug-in sensor is secured in the detector assembly by the housing cap. There is a different
sensor for each target gas. Through a series of chemical and electrical reactions, the sensor
produces an electrical output that corresponds to the detection range of the sensor. A
VersaporR membrane is installed on the sensor face for protection from water and debris.
Junction Box
The junction box protects the detector wiring connections and allows you to install the toxic
detector at a mounting site that is remote from a controller. Two conduit hubs allow you to
mount the toxic detector to the junction box and connect the wiring from the detector to a
Plug-in Sensor
(different for each detector type)
Detector
Housing Cap
VersaporR Membrane
Detector Housing Body
(different for each detector type)
Cap Gasket
Figure 2: 65-2302 Toxic Detector Component Location

8 • 65-2302/65-2303 Toxic Detector
controller. Three spacers installed on the back of the junction box control the distance of the
junction box from a mounting surface and ensure that there is enough room to install a
calibration cup on the detector during calibration. A terminal block within the junction box
facilitates the wiring connections. A cover on the front of the junction box allows access to the
interior of the junction box.
Installation
This section describes procedures to mount the toxic detector in the monitoring environment
and wire the detector to a controller.
Mounting the Toxic Detector
NOTE: If you are installing a 65-2302, it does not include a junction box and is usually
factory installed in one of a controller’s conduit hubs or may be field installed using
the 3/4 NPT threads on the end with the wires. The 65-2303 includes a junction box
as shown in Figure 3 below.
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 detector 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 where the target gas is likely to be found first.

65-2302/65-2303 Toxic Detector • 9
NOTE: If your application does not require a specific mounting site, mount the detector at
approximately breathing level.
2. At the mounting site you select, hang or mount the junction box with the detector facing
down (see Figure 3).
CAUTION:Mount the toxic detector with the detector facing down (see Figure 3.)
Wiring the Toxic Detector 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 or unplug power to the controller.
3. If the detector is mounted remotely from a controller using the junction box, proceed to
step 4.
If the detector is mounted directly to a controller, connect the detector’s color-coded and
black wires to the appropriate controller detector terminals (see Figure 4 for the color
coding of the non-black wire) and skip to the Startup Section.
4. Remove the junction box cover.
Figure 3: Outline and Mounting Dimensions
Rubber
Spacer, 3X
.38
.75
3.10
Detector
+3/4" NPT
7.30 .25
3.65
65-2302
1 1/2-20 Thread for
Calibration Cup
Ø1.75
3/4 NPT
Conduit Hub
1 1/2-20 Thread for
Calibration Cup
Junction
Box
65-2303
6.70 Max
.75
1.22

10 • 65-2302/65-2303 Toxic Detector
5. Guide a two-conductor, shielded cable or two wires in conduit through the unused conduit
hub of the junction box. Use appropriate conduit fittings and construction technique for
the environmental rating of the junction box. The junction box is rated NEMA 4X.
6. Connect the two wires to the detector using the terminal block.
CAUTION:If using shielded cable, leave the drain wire insulated and disconnected at the
detector. You will connect the opposite end of the cable’s drain wire at the
controller.
7. Secure the junction box cover to the junction box.
8. Route the cable or wires leading from the toxic detector through one of the conduit hubs at
the controller housing. Use appropriate conduit fittings and construction technique for the
environmental rating of the controller. RKI controllers are typically rated NEMA 4X.
CAUTION:Do not route power and detector wiring through the same conduit hub. The power
cable may disrupt the transmission of the detector signal to the controller.
9. Connect the wires to the applicable controller terminal strip. See the controller operator’s
manual and the controller’s detector head specification sheet for the 65-2302 or 65-2303
detector.
10. If using shielded cable, connect the cable’s drain wire to an available chassis ground at the
controller. RKI controllers typically have a ground stud that is a convenient grounding
location.
(+) See Table
CL2
CLO2
HCN violet
yellow
Controller Detector Terminals,
Typical Designations
Controller Housing
+
S
Terminal Strip
Detector
Black (S)
Shielded
Cable
Gas Type + Wire
white
redNH3
Figure 4: Wiring to a Controller