RKI Instruments 65-2333 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2333
Hydrogen Cyanide Transmitter
Operator’s Manual
Part Number: 71-0265
Revision: P1
Released: 1/17/23

2• 65-2333 Hydrogen Cyanide Transmitter Operator’s Manual
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.

65-2333 Hydrogen Cyanide Transmitter Operator’s Manual • 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:
• Absorbent cartridges
•Fuses
• Pump diaphragms and valves
•Batteries
• Filter elements
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 APARTICULAR PURPOSE. INNO
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.

4• 65-2333 Hydrogen Cyanide Transmitter Operator’s Manual
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HCN Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting the HCN Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring the HCN Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Zero Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing Components of the HCN Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

65-2333 Hydrogen Cyanide Transmitter Operator’s Manual Overview • 5
Overview
This manual describes the 65-2333 explosion-proof hydrogen cyanide (HCN) transmitter. This
manual also describes how to install, start up, maintain, and calibrate the transmitter. A parts list
at the end of this manual lists replacement parts and accessories for the HCN transmitter.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1 lists specifications for the HCN transmitter.
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions:
WARNING: When using the 65-2333, you must follow the instructions and warnings in this
manual to assure proper and safe operation of the 65-2333 and to minimize the
risk of personal injury. Be sure to maintain and periodically calibrate the 65-
2333 as described in this manual.
Table 1: Specifications
Target Gas Hydrogen cyanide (HCN)
Area Classification Explosion-proof for Class I, Groups B, C, and D
Temperature Code T6
Installation Category
Installation Category 1. Signal level, special equipment or
parts of equipment, telecommunication, electronic, etc., with
smaller transient overvoltages than Installation 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 15.0 ppm (parts per million)
Accuracy ± 10% of reading or ± 5% of full scale (whichever is greater)
HCN Detector Signal
Output
0.3 mA at 0 ppm HCN nominal
2.5 mA at 15.0 ppm HCN nominal
Response Time 90% in 30 seconds
Operating Temperature -4°F to 104°F (-20°C to 40°C)
!

6• Description 65-2333 Hydrogen Cyanide Transmitter Operator’s Manual
Description
This section describes the components of the HCN transmitter. The transmitter consists of the
HCN detector, amplifier, and junction box.
Figure 1: HCN Transmitter Component Location
Amplifier
Controller Terminal Strip
SIG/PWR
HCN Detector
J-Box
Detector Terminal Strip
Factory Adjust Pot
Span Pot
Zero Pot
ZERO
SPAN
+ Test Point (Red)
- Test Point (Black)
S
TO XIC OXY

65-2333 Hydrogen Cyanide Transmitter Operator’s Manual Description • 7
HCN Detector
The HCN detector consists of the detector housing body, detector housing cap, cap gasket, rubber
boot, spacer, and the plug-in sensor.
Figure 2: HCN 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 housing to screw the HCN 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 HCN detector to the amplifier. One of the wires is red and one of the wires is
black.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four pins to
secure the sensor within the detector housing. A pre-amplifier, located between the sockets and
two interconnect wires, conditions the sensor’s signal before the signal reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and protects it
from damage. The housing cap also includes a flame arrestor which contains any sparks that may
occur within the detector and a flame arrestor guard which protects the 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.
Rubber Boot and Spacer
A rubber boot and spacer are installed between the detector housing cap and the sensor. They help
ensure that the detector remains plugged into the detector housing body.
Spacer
Rubber Boot
Flame
Arrestor
Guard
Detector
Housing Cap
Detector Housing Body
Cap Gasket
HCN Plug-in Sensor
VersaporR Membrane

8• Description 65-2333 Hydrogen Cyanide Transmitter Operator’s Manual
Plug-In HCN Sensor
The sensor is secured within the detector assembly by the housing cap. Through a series of
chemical and electrical reactions, the sensor produces an electrical output that corresponds to the
detection range of the transmitter. A VersaporR membrane is installed on the sensor face for
added protection from water and particulate contaminants.
Amplifier
The amplifier converts the electrical output from the sensor 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 (Figure 1).
Controller Terminal Strip
The interconnect 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 connect the amplifier to a controller.
Detector Terminal Strip
The detector terminal strip is a four-point plug-in style terminal strip near the bottom of the
amplifier. Use the detector terminal strip to connect the HCN detector to the amplifier.
NOTE: The HCN detector is factory-wired to the detector terminal strip. See “Installation” on
page 9 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 (HCN
free) output during the start-up and calibration procedures. 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 response output
during the calibration procedure. Turn the adjustment screw clockwise to increase the output and
counterclockwise to decrease the output.
CAUTION: The third potentiometer is factory-set. Do not adjust it.
Test Points
The test points (red and black) are on the left side of the amplifier (see Figure 1). The test points
produce a 100mV 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.

65-2333 Hydrogen Cyanide Transmitter Operator’s Manual Installation • 9
Junction Box
Use the junction box to install the HCN 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 NPT 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. 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.
Installation
This section describes procedures to mount the HCN transmitter in the monitoring environment
and wire the detector to a controller.
Mounting the HCN 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 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 that is at normal breathing level.
Figure 3: Mounting the HCN Detector
.38
.75
3.10
J-Box
3/4 NPT
Female
Rubber
Spacers
3X
3.65
HCN Detector
11/2-20Threadfor
Calibration Cup
8.18 Max

10 • Installation 65-2333 Hydrogen Cyanide Transmitter Operator’s Manual
2. At the monitoring site you select, hang or mount the junction box with the detector facing
down (see Figure 3).
Wiring the HCN 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 4.
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.
WARNING: To maintain the explosion proof classification of the HCN detector/junction
box combination, a conduit seal must be used within 18 inches of the junction
box conduit hub used for wiring to the controller.
6. Guide 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 4).
• Connect the positive wire to the terminal labeled SIG/PWR “+” terminal.
• Connect the signal wire to the terminal labeled SIG/PWR “S” terminal.
CAUTION: If a shielded cable is used, leave the cable shield’s drain wire insulated
and disconnected 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 HCN 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.