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RKI Instruments M2, Hydrogen Cyanide (HCN) 0 - 15 ppm Sensor/Transmitter, Non Explosion Proof with J-Box - 65-2618RK-HCN

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RKI Instruments M2, Hydrogen Cyanide (HCN) 0 - 15 ppm Sensor/Transmitter, Non Explosion Proof with J-Box - 65-2618RK-HCN

RKI Instruments M2, Hydrogen Cyanide (HCN) 0 - 15 ppm Sensor/Transmitter, Non Explosion Proof with J-Box - 65-2618RK-HCN


65-2618RK-HCN M2, Hydrogen Cyanide (HCN) 0 - 15 ppm Sensor/Transmitter, Non Explosion Proof with J-Box by RKI Instruments

, RKI Instruments uses the latest cutting edge technology when developing transmitters and sensors. Its dedication to workplace safety and reliable safety solutions is unparalleled. The M2 Stand Alone Transmitter utilizes state of the art sensor cell technology to integrate workplace safety with the industry's more advanced transmitter technologies.

M2 Stand Alone Transmitter

The M2 Stand Alone Transmitter is operational with or without a controller and is available in two forms: explosion proof and non-explosion proof. The unit has a backlit screen for a direct digital readout, and a user friendly setup with push buttons and easy to read LCD menus. The advanced technology transmitter can function as an independent standalone system or as part of an integrated detection and transmission system. Using state of the art technology, the transmitter uses a magnetic want technique for performing non-intrusive calibration. For optimal stability and accurate readings, the unit provides an automatic zero drift correction feature. This also reduces the need for adjustments due to sensor aging.

The M2 Stand Alone Transmitter is available for LEL, H2S, CO, PPM, HC, CO2, CI2, NH3, SO2, HCN, and more. The unit also features an infrared sensor for CO2 and combustible gases. With 2 fully programmable alarms and a fail relay, the visual color coded LED alarms are reliable and customizable to meet specific needs.

Advanced sensor technology

The state of the art sensors are long lasting with a lifespan typically over two years. Sensor construction is rated Class I, Division 1 groups B, C, and D for flammables, CO, H2S, O2, and CO2. The sensors are rated Class I, Division 2 for all other toxic gases. Depending on the gas, the sensors will operate through a catalytic, galvanic cell, electrochemical, or infrared design. The plug in nature of the sensors allows for a quick and tool free onsite replacement.


Each transmitter features 2 to 3 years of life with normal service. The explosion proof LEL H2 specific transmitter has 3 to 5 years with normal service, and the explosion proof carbon dioxide, methane, and hydrocarbons feature over 5 years of life with normal service. The explosion proof transmitters are also water repellant. Each device is approximately 8.5H x 5.2W x 4.5D and features an alphanumeric display with a backlight. The screen displays 8 characters per line with 2 lines for gas concentration readouts.

Optional Accessories

The M2 Stand Alone Transmitter has a variety of optional accessories available including calibration adaptors, flow through adaptors, remote horns and lights, calibration kits, battery backups, splash guards, air aspirator adaptors or panels, and dataloggers. The transmitters are directly compatible with Beacon 110, 200, 410, and 800 controllers.

*Please note we can only ship RKI products to customers within the United States

M2 Series Non Explosion Proof Specifications:
Hydrogen Sulfide
Carbon Monoxide
See Chart Below
Carbon Dioxide
See Chart Below
Galvanic cell
Measuring Ranges
0-25% Vol.
0-100 ppm
0-300 ppm
See Chart Below
0 - 5000 ppm
0 - 5% Vol.
0 - 50% Vol.
0 - 100% Vol.
0.1% Vol.
1 ppm
See Chart Below
20 ppm/0.1% Vol./1% Vol.
Lower Detectable Limit (LDL)
0.1% Vol.
2% of full scale
Response Time (T-90)
35 Seconds or less
60 Seconds or less
30 Seconds or less
Life Expectancy
2 to 3 years with normal service
5 years plus
(which ever is greater)
± 0.5% O2
± 5% of reading or
± 2 ppm H2S
± 5% of reading or
± 5 ppm CO
± 10% of reading or
± 5% of full scale
± 5% of reading or
± 2% of full scale
Alarm Settings
Two fully programmable alarm set points, increasing / decreasing, latching / self-resetting, on delays, off delays, normally energized or de-energized
Alarm Indication
Visual LEDs. Alarm 1=Amber; Alarm 2=Red; Fail=Red
5 Amp form ‘C’ contacts for alarm 1, alarm 2, and fail
Height: 8.5” (215 mm), Width: 5.2” (132 mm), Depth: 4.5” (114 mm)
Alphanumeric display with backlighting. 8 characters per line;
2 lines for gas concentration readout, plus user-friendly calibration and setup
Sensor Rating
Non explosion proof construction, Class I, Div. 2, Groups B, C, D
Housing J-Box
NEMA 4X, explosion proof, watertight, cast aluminum with o-ring seal and epoxy powder coating
Magnet used for calibration functions. Calibrates without opening the housing. Internal push-button controls also available for calibration and setup
Aluminum / Plastic (non explosion proof)
Operating Environment
Operating Temperature
-4°F to 122°F
-20°C to 50°C
14°F to 104°F
-10°C to 40°C
-4°F to 122°F
-20°C to 50°C
Relative Humidity
5 - 95% RH non-condensing
Indoor or outdoor.
Operating Voltage
19 VDC - 30 VDC, 12 VDC versions available
Linear 4-20 mA signal, into 500 ohms impedance max, corresponding to 0 - full scale
Modbus RTU output standard, fully configurable, 2-wire RS-485, 1200 to 19.2k baud
Compatible with all RKI Beacon controllers, as well as most DCS / PLC systems:
Beacon 110, Beacon 200, Beacon 410, Beacon 800, and Pioneer 4W and Pioneer 16R
One year materials and workmanship

M2 Toxic Transmitter Sensor Ordering Information:
Part Number With J-Box
Arsine (ASH3)
0 - 1.5 ppm
0.01 ppm
Ammonia (NH3)
0 - 75.0 ppm
0.1 ppm
Phosphine (PH3)
0 - 1.00 ppm
0.01 ppm
Hydrogen Cyanide (HCN)
0 - 15.0 ppm
0.1 ppm
Sulfur Dioxide (SO2)
0 - 6.00 ppm
0.01 ppm

M2 Wiring Matrix:
Number of Wires to Controller
Maximum Distance to Controller
18 AWG wire
16 AWG wire
14 AWG wire
M2 Transmitter
2500 ft.
5,000 ft.
8,000 ft.

Datasheets & User Manuals

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