RKI Instruments 65-2425 User manual

RKI Instruments, Inc.
www.rkiinstruments.com
65-2425
Hydrogen Cyanide Detector
Operator’s Manual
Part Number: 71-0623
Revision: P1
Released: 1/17/23

2• 65-2425 Hydrogen Cyanide Detector 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.

65-2425 Hydrogen Cyanide Detector 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• 65-2425 Hydrogen Cyanide Detector Operator’s Manual
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Detector Housing, Housing Cap, & Cap Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rubber Boot and Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mounting the HCN Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Wiring the HCN Detector to a Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setting the Zero Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Replacing Components of the HCN Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

65-2425 Hydrogen Cyanide Detector Operator’s Manual Overview • 5
Overview
This manual describes the 65-2425 hydrogen cyanide (HCN) detector. This manual also describes
how to install, start up, maintain, and calibrate the detector when it is used with a gas monitoring
controller. A parts list at the end of this manual lists replacement parts and accessories for the
HCN detector.
Specifications
WARNING: Do not use this product in a manner not specified in this instruction manual.
Table 1 lists specifications for the HCN detector.
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions:
Table 1: Specifications
Tar get G as Hydrogen cyanide (HCN)
Area Classification* Explosionproof 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).
Sampling Method Diffusion
HCN Detector Signal
Output
0.3 mA at 0 ppm HCN nominal
2.5 mA at 15.0 ppm HCN nominal
Detection Range 0 to 15.0 ppm (parts per million)
Accuracy ± 10% of reading or ± 5% of full scale (whichever is greater)
Response Time 90% in 30 seconds
Operating
Temperature
-4°F to 104°F (-20°C to 40°C)
* The area classification only applies if the detector is installed using a 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. The detector is not explosion proof if it is installed in a non-explosion proof
enclosure, such as in a conduit hub of a controller like the Beacon 200 or Beacon 800.
!

6• Description 65-2425 Hydrogen Cyanide Detector Operator’s Manual
WARNING: When using the 65-2425, you must follow the instructions and warnings in this
manual to assure proper and safe operation of the 65-2425 and to minimize the
risk of personal injury. Be sure to maintain and periodically calibrate the 65-
2425 as described in this manual.
Description
This section describes the components of the HCN detector. The detector consists of the detector
housing body, housing cap, cap gasket, rubber boot, spacer, and the HCN sensor.
Figure 1: HCN Detector Component Location
Detector Housing Body, Housing Cap, & Cap Gasket
The detector housing body protects the sensing components within the housing. Use the mounting
threads at the top of the housing to screw the HCN detector into a 3/4 NPT hub. 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 which may occur within the detector housing. A cap gasket seals the interface
between the housing and cap. A 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 HCN
detector to a controller. 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.
Rubber Boot
Flame
Arrestor
Guard
Detector
Housing Cap
Spacer
VersaporR Membrane
Detector Housing Body
Cap Gasket
HCN Plug-in Sensor

65-2425 Hydrogen Cyanide Detector Operator’s Manual Installation • 7
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.
Plug-In Sensor
The sensor is secured within the sensor housing by four pins. Through a series of chemical and
electrical reactions, the sensor produces an electrical output that is proportional to the detection
range of the detector. A VersaporR membrane is installed on the sensor face for added protection
from water and particulate contaminants.
Installation
NOTE: Normally, the HCN detector is shipped already installed in one of the bottom conduit
hubs of a controller and factory wired to the controller. If your detector is already
installed in a controller, use this section for reference only.
This section describes procedures to mount the HCN detector in the monitoring environment and
wire the detector to a controller.
Mounting the HCN Detector
1. Whether you will mount the detector directly to a controller or to a junction box, 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.
NOTE: If your application does not require a specific mounting site, mount the
detector at approximately breathing level.

8• Installation 65-2425 Hydrogen Cyanide Detector Operator’s Manual
Figure 2: Outline & Mounting Dimensions
2. At the monitoring site, mount the detector in one of the following two ways:
• Screw the detector’s 3/4 NPT mounting thread into an empty conduit hub on a controller.
OR
• Screw the detector’s 3/4 NPT mounting thread into an appropriately rated junction box.
CAUTION: Mount the HCN detector with the detector facing down (see Figure 2).
NOTE: If the mounting site requires the detector installation to be explosion proof,
you must install the detector in a 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.
Wiring the HCN Detector to a Controller
WARNING: Always verify that the power source is OFF before you make wiring connections.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
Shrink Tubing
3/4 NPT
1.62 Flats for
Wrench
1-1/2-20 ForCalibration Cup
9.75 Ref
2.25 Ref
Ø 1.75
0.75
3.59

65-2425 Hydrogen Cyanide Detector Operator’s Manual Installation • 9
3. If the detector is mounted remotely from a controller using an explosion proof junction box,
proceed to step 4.
If the detector is mounted directly to a controller, connect the detector’s red and black
wires to the appropriate controller detector terminals and skip to the Startup Section.
4. Remove the junction box cover.
WARNING: To maintain the explosion proof classification of the HCN detector/junction
box combination, a conduit seal must be used within 2 inches of the junction
box conduit hub used for wiring to the controller.
5. Guide a two-conductor, shielded cable or two wires in conduit through an unused conduit hub
of the junction box.
6. Connect the two wires to the detector using an appropriate 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 HCN detector through one of the conduit hubs at the
controller housing.
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.

10 • Installation 65-2425 Hydrogen Cyanide Detector Operator’s Manual
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 HCN detector.
Figure 3: Wiring the HCN Detector to a Controller
10. 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.
11. Reinstall the junction box cover.
Controller HCN Detector Terminals
(typical terminal designation shown) S
+
RedBlack

65-2425 Hydrogen Cyanide Detector Operator’s Manual Start Up • 11
Start Up
This section describes procedures to start up the HCN detector and place the detector 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 at the power source end, then turn on the controller.
4. Verify that the controller is on and operating properly. Refer to the controller operator’s
manual.
CAUTION: Allow the detector to warm up for 5 minutes before you continue with the next
section, “Setting the Zero Signal”.
Setting the Zero Signal
WARNING: If the detector installation is explosion proof, do not remove the sensor cap or
junction box cover while the circuits are energized unless the area is determined
to be non-hazardous. Keep the sensor cap and junction box cover tightly closed
during operation.
CAUTION: If you suspect the presence of the target gas in the monitoring environment, use the
calibration kit and the zero air calibration cylinder to introduce “fresh air” to the
sensor and verify an accurate zero setting.
1. Verify that the detector is in a fresh air environment (environment known to be free of
hydrogen cyanide, other toxic and combustible gases, and of normal oxygen content, 20.9%).
2. Verify a reading of 0 ppm HCN at the controller.
If the display reading is 0 ppm HCN, start up is complete. The detector is in normal
operation. If the display reading is not 0 ppm HCN, continue with step 3.
3. Perform a zeroing operation at the controller. See the controller operator’s manual for
directions.

12 • Maintenance 65-2425 Hydrogen Cyanide Detector Operator’s Manual
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 HCN detector. It includes daily and quarterly procedures.
Daily
Verify a display reading of 0 ppm HCN at the controller. Investigate significant changes in the
display reading.
Quarterly
Calibrate the HCN detector as described in “Calibration” on page 16.
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended action for
problems you may encounter with the HCN detector.
NOTE: This troubleshooting guide describes detector problems only. See the controller
operator’s manual for problems you may encounter with the controller.
Condition Symptom(s) Probable Causes Recommended Action
Fail Condi-
tion
• Controller indicates a
fail condition.
• The transmitter wiring
to the controller is
disconnected or
misconnected.
• The transmitter’s zero
reading is low enough
to cause a fail
condition.
• The detector is
malfunctioning.
1. Verify that the detector wiring is
correct and secure.
2. Perform a full calibration.
3. If the fail condition continues,
replace the plug-in sensor as
described later in this section.
4. If the fail condition continues,
contact RKI for further instruction.

65-2425 Hydrogen Cyanide Detector Operator’s Manual Maintenance • 13
Replacing Components of the HCN Detector
This section includes a procedure to replace the HCN sensor and one to replace the entire detector
assembly. In most cases, it is not necessary to replace the entire detector assembly.
Replacing the Sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not disassemble the
sensor when replacing it with a new one. If sensor electrolyte comes in contact with
your skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Unscrew the detector housing cap from the detector housing.
4. Unplug and remove the HCN sensor with the rubber boot and spacer attached.
5. Remove the rubber boot and spacer from the old sensor.
6. Remove the replacement sensor from its packaging and remove the wire jumper. This wire
jumper is installed on the sensor pins for shipment or storage but must be removed for the
sensor to operate properly when installed in a detector.
Slow or No
Response/
Difficult or
Unable to
Calibrate
• Unable to accurately
set the zero or
response reading
during calibration.
• Detector requires
frequent calibration.
NOTE: Under
“normal”
circumstances, the
transmitter requires
calibration once every
3 months.
Some applications may
require a more frequent
calibration schedule.
• 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.
•TheVersaporR
membrane on the
sensor face is blocked
by dirt or some other
particulate
contamination.
• The detector is
malfunctioning.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Examine the detector housing cap. If
it is only saturated with liquid, dry it
out. If it appears dirty, replace it.
3. Examine the VersaporR membrane
and replace it if it appears dirty.
4. If the calibration/response difficulties
continue, replace the plug-in sensor
as described later in this section.
5. If the calibration/response difficulties
continue, contact RKI for further
instruction.
Condition Symptom(s) Probable Causes Recommended Action

14 • Maintenance 65-2425 Hydrogen Cyanide Detector Operator’s Manual
WARNING: The HCN sensor will not operate properly if the wire jumper is not removed.
7. Install the spacer and rubber boot onto the replacement sensor’s face.
8. Carefully plug the replacement sensor into the socket pattern that is located in the detector
housing.
NOTE: Match the sensor’s male pins with the four female sockets as you plug the
sensor into the sockets.
9. Screw the detector housing cap onto the top section.
10. Turn on power to the controller.
11. Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 15 minutes before you
continue with the next step.
12. Calibrate the detector as described in “Calibration” on page 16.
Replacing the VersaporR Membrane
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 body.
4. Unplug the plug-in sensor from the four-socket pattern in the detector housing body.
5. Gently pry up the edge of the white VersaporR membrane from the sensor face with a small
flat blade screwdriver or a similar tool.
6. Peel off the VersaporR membrane. It may be necessary to clean off the sensor face to remove
any residue left from the adhesive backed membrane.
7. Install the new membrane on the face of the plug-in sensor.
8. Plug the sensor back into the four-socket pattern in the detector housing body.
9. Make sure the cap gasket is in place and screw the detector housing cap back onto the detector
housing body.
10. Turn on power to the controller.
Figure 4: Plug-In Sensor Jumper Removal
Remove jumper

65-2425 Hydrogen Cyanide Detector Operator’s Manual Maintenance • 15
11. Turn on the controller.
Replacing the HCN Detector
NOTE: In most cases, it is only necessary to replace the HCN sensor.
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. If the detector is installed directly on a controller, open the controller door.
If the detector is installed remotely from a controller in a junction box, remove the junction
box cover.
4. If the detector is installed directly on a controller, disconnect the detector leads from the
detector terminal strip in the controller. Note the position of the color-coded leads as you
remove them.
If the detector is installed remotely from a controller in a junction box, disconnect the
detector leads from the terminal block in the junction box. Note the position of the color-
coded leads as you remove them.
5. Unscrew the detector from the controller conduit hub or junction box hub.
6. Guide the detector leads of the replacement detector through the controller conduit hub or
junction box hub then screw the mounting threads of the detector into the hub.
7. If the detector is installed directly on a controller, connect the detector leads to the appropriate
detector terminal strip terminals. See the controller operator’s manual and the controller’s
detector head specification sheet for the HCN detector.
If the detector is installed remotely from a controller in a junction box, connect the detector
leads to the terminal block the same way the old detector was wired. See the controller
operator’s manual and the controller’s detector head specification sheet for the HCN
detector to verify the connections are correct.
8. If the detector is installed remotely from a controller in a junction box, reinstall the junction
box cover.
9. Turn on or plug in power to the controller.
10. Turn on the controller.
CAUTION: Allow the replacement detector to warm up for 15 minutes before you
continue with the next step.
11. Calibrate the replacement detector as described in “Calibration” on page 16.

16 • Calibration Frequency 65-2425 Hydrogen Cyanide Detector Operator’s Manual
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most HCN detector applications. Unless
experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a
calibration frequency of every 3 months for the HCN detector.
If an application is not very demanding, for example detection in a clean, temperature controlled
environment, and calibration adjustments are minimal 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.
Calibration
This section describes how to calibrate the HCN detector. It includes procedures to prepare for
calibration, set the zero reading, set the response reading, and return to normal operation. It
describes calibration 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.
Preparing for Calibration
1. Screw the calibration cup onto the bottom of the HCN detector.
2. Screw the regulator into the zero air calibration cylinder.
3. Use the sample tubing to connect the regulator to the calibration cup.
NOTE: If you can verify that the HCN detector is in a fresh air environment, you do
not need to apply zero air to the detector before adjusting the zero reading.
4. Put the controller into its calibration program.
Setting the Zero Reading
1. Follow the directions in the controller operator’s manual for setting the zero reading.
2. When the instructions call for applying zero air to the detector, turn the regulator’s on/off
knob counterclockwise to open it. Gas will begin to flow.
3. Allow the gas to flow for two minutes.
4. Set the zero reading according to the controller operator’s manual.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.

65-2425 Hydrogen Cyanide Detector Operator’s Manual Calibration • 17
Setting the Response Reading
1. Follow the directions in the controller operator’s manual for setting the response reading.
2. For toxic gas cylinders (like HCN), it is important to vent the regulator while installing it onto
the cylinder. Venting the regulator during installation helps prevent air from getting into the
cylinder and degrading the gas. When the directions call for exposing the detector to gas, open
the regulator by turning the knob counterclockwise and then install it onto the cylinder.
3. Allow the gas to flow to the detector for 2 minutes.
4. Set the response reading according to the controller operator’s manual.
5. After setting the response reading, unscrew the regulator from the cylinder and remove the
calibration cup from the detector.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
Returning to Normal Operation
1. Allow about 45 seconds for the gas reading to decrease below the alarm points and then return
the controller to normal operation.
NOTE: If you do not allow the gas reading decrease below the alarm points, then
unwanted alarms may occur.
2. Verify that the controller display reading decreases and stabilizes at 0 ppm HCN.
3. Store the components of the calibration kit in a safe and convenient place.

18 • Parts List 65-2425 Hydrogen Cyanide Detector Operator’s Manual
Parts List
Table 2 lists replacement parts and accessories for the HCN detector.
Table 2: Parts List
Part Number Description
06-1248RK Sample tubing (order by the foot)
07-0033RK Detector housing cap gasket
07-0203RK Rubber retaining boot
14-2101RK Spacer between sensor and rubber boot
33-0157RK VersaporR membrane for sensor face
65-2049-01 HCN replacement sensor, with membrane
65-2425 HCN replacement detector assembly (includes sensor)
71-0623 65-2425 HCN Detector Operator’s Manual (this document)
81-0064RK-04 Calibration cylinder, 10 ppm HCN in nitrogen, 34 liter aluminum
81-0076RK Zero air calibration cylinder, 17 liter
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0076RK-03 Zero air calibration cylinder, 103 liter
81-0196RK-02 Calibration gas cylinder, 10 ppm HCN in nitrogen, 58 liter aluminum
81-0196RK-04 Calibration gas cylinder, 10 ppm HCN in nitrogen, 34 liter aluminum
81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17 liter and 34 liter
steel calibration cylinders (cylinders with external threads)
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34 liter aluminum, 58
liter, and 103 liter cylinders (cylinders with internal thread)
81-1117RK Calibration cup