M2A_Hires

M2A Series Stand Alone
Explosion Proof Transmitter

  • Operates with or without a controller
  • Direct digital readout with OLED
    cold temperature display
  • LEL, O2, H2S, CO, CO2,
    • 100% Vol CH4, and 0-9,000 PPM CH4
    • Toxic Gases include NH3, SO2, HCN, and more
  • Infrared sensor for combustibles
    and CO2
  • 4-20 mA & digital Modbus outputs standard
  • 2 fully programmable alarm relays & fail relay
  • Non-intrusive calibration via magnetic wand
  • Explosion proof construction
  • Patented water repellent sensor cover
  • User friendly setup, push buttons & OLED
    menus
  • Long-life sensors (2+ years typical)

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    • Description
    • Applications
    • Specifications
    • Download

    The RKI M2A™ is a state-of-the-art transmitter that can operate as an independent, stand-alone monitor or as part of an integrated system. The M2A connects with an analog or digital signal to virtually any controller, PLC, or DCS. Setup procedures are simplified with user friendly push buttons and OLED menus. It utilizes a magnetic wand technique for performing non-intrusive calibration. The M2A provides an automatic zero drift correction feature, which results in more stable readings and reduces the need for adjustments due to sensor aging.

    The housing of the M2A does not need to be opened for zeroing or calibration, making it unnecessary to declassify the area for routine maintenance. It is designed so that a complete field calibration can be performed by one person. Sensor construction is rated Class I, Div. 1 Groups B, C, D for flammables, CO, H2S, O2, and CO2, and Class I, Div. 2 for all other toxics.

    The transmitter provides a 4-20 mA output in addition to a Modbus digital output. It also has two levels of alarms with relays, plus a fail alarm with relay. A digital display of the gas concentration, as well as alarm and status lights, can be viewed through the front window.

    The toxic sensors are electrochemical type plug-in sensors, which provide high specificity, fast response, and long life. The plug-in design allows quick replacement in the field with no tools required. Toxic sensors are designed for use in Class I, Div. 2 hazardous locations. Sensors available for NH3, SO2, PH3, AsH3, and HCN.

    The M2A represents the latest leading edge technology in sensor / transmitters today.

    • Petrochemical plants
    • Refineries
    • Water & wastewater treatment plants
    • Pulp & paper mills
    • Manufacturing facilities
    • Automotive
    • Semiconductor plants
    • Chemical plants

    Explosion Proof

    Combustibles

    LEL

    H2 Specific

    O2

    Oxygen

    H2S

    Hydrogen Sulfide

    CO

    Carbon Monoxide

    CH4

    Methane

    HC

    Hydrocarbons

    CO2

    Carbon Dioxide

    LEL

    PPM

    Part #

    UL

    65-2640RK

    65-2647RK

    65-2641RK

    65-2643RK-05

    65-2645RK-05

    65-2646RK-05

    65-2649RK-CH4

    65-2658RK-CH4

    65-2649RK-HC

    65-2660RK-02

    65-2660RK-03

    65-2660RK-05

    65-2660RK-10

    LEL

    65-2640RK-05

    65-2647RK-05

    65-2641RK-05

    Sensors

    Catalytic

    Galvanic cell

    Electrochemical

    Infrared

    Measuring Ranges

    0 – 100% LEL

    0 – 9000
    ppm

    CH4

    0 – 100%
    LEL

    0 – 25.0% Vol.

    0 – 100 ppm

    0 – 300 ppm

    0 – 100% LEL

    0 – 100% Vol.

    0 – 100% LEL

    -02

    0 – 5000 ppm

    -03

    -05

    0 – 5% Vol.

    0 – 50% Vol.

    -10

    0 – 100% Vol.

    Resolution

    1% LEL

    20 ppm

    1% LEL

    0.1% Vol.

    1 ppm

    1% LEL / 1% Vol.

    20 ppm / 0.01% Vol / 0.1% Vol. / 1% Vol.

    Lower Detectable Limit (LDL)

    2% of full scale

    0.1% Vol.

    2% of full scale

    Max Current Draw (24VDC)

    160 mA with alarm 1 and alarm 2 active and all relays energized

    125 mA with alarm 1 and alarm 2

    active and all relays energized

    160 mA with alarm 1 and alarm 2

    active and all relays energized

    Response Time (T-90)

    35 Seconds or less

    90 Seconds
    or less

    60 Seconds
    or less

    90 Seconds
    or less

    30 Seconds or less

    Life Expectancy

    2 to 3 years with normal service

    3 to 5 years with normal service

    2 to 3 years with normal service

    5 years plus with normal service

    Accuracy
    (which ever is greater)

    ± 5% of reading or ± 2% of full scale

    ± 0.5% Vol. O2

    ± 5% of
    reading or
    ± 2 ppm H2S

    ± 5% of
    reading or
    ± 5 ppm CO

    ± 5% of reading or ± 2 % of full scale

    Weather Resistant

    Patented water repellent sensor coating

    Alarms

    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

    Relays

    5 amp form ‘C’ contacts for alarm 1, alarm 2, and fail

    Physical

    Dimensions

    Height: 8.5” (215 mm), Width: 5.2” (132 mm), Depth: 4.5” (114 mm)

    Display

    Alphanumeric OLED display. 8 characters per line;
    2 lines for gas concentration readout, plus user-friendly calibration and setup

    Enclosure

    Explosion proof for Class I, Div 1, Groups B, C, D.

    Enclosure Rating

    NEMA 4X, explosion proof, watertight, cast aluminum with o-ring seal and epoxy powder coating

    Controls

    Magnet used for calibration functions. Calibrates without opening the housing.
    Internal push-button controls also available for calibration and setup

    Operating Environment

    Operating Temperature

    -40°F to 167°F

    -40°C to 75°C

    -4°F to 113°F -20°C to 45°C

    -40°F to 104°F

    -40°C to 40°C

    23°F to 104°F

    -5°C to 40°C

    -40°F to 122°F

    -40°C to 50°C

    Relative Humidity

    5 – 95% RH non-condensing

    Location

    Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, D.

    Operating Voltage

    10 VDC – 30 VDC

    Outputs

    Analog

    Linear 4-20 mA signal, into 1000 ohms impedance max (24DC), 0 – 500 ohms max (12VDC) corresponding to 0 – full scale

    Digital

    Modbus RTU output standard, fully configurable, 2-wire RS-485, 1200 to 19.2k baud

    Approvals

    65-2640RK
    UL

    65-2641RK

    UL

    C CSA US

    C UL US

    65-2640RK-05
    C CSA US

    65-2641RK-05
    C CSA US

    Controllers

    Beacon 110, Beacon 200, Beacon 410A, Beacon 800 as well as most DCS / PLC systems

    Warranty

    One year material and workmanship

    Non Explosion Proof

    O2

    Oxygen

    H2S

    Hydrogen Sulfide

    CO

    Carbon Monoxide

    Toxics

    See Chart Below

    CO2

    Carbon Dioxide

    Part#

    65-2666RK

    *65-2644RK

    65-2662RK

    65-2663RK

    See Chart Below

    65-2661RK-02

    65-2661RK-03

    65-2661RK-05

    65-2661RK-10

    Sensors

    Galvanic cell

    Electrochemical

    Infrared

    Measuring Ranges

    0-25% Vol.

    0-100 ppm

    0-300 ppm

    See Chart Below

    -02

    0 - 5000 ppm

    -03

    -05

    0 - 5% Vol.

    0 - 50% Vol.

    -10

    0 - 100% Vol.

    Resolution

    0.1% Vol.

    1 ppm

    See Chart Below

    20 ppm / 0.01% Vol. / 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

    Max Current Draw (24VDC)

    125 mA with alarm 1 and alarm 2 active and all relays energized

    160 mA with alarm 1 and alarm 2 active and all relays energized

    Life Expectancy

    2 to 3 years with normal service

    5 years plus

    Accuracy
    (which ever is greater)

    ± 0.5% Vol. 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

    Alarms

    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

    Relays

    5 Amp form ‘C’ contacts for alarm 1, alarm 2, and fail

    Physical

    Dimensions

    Height: 8.5” (215 mm), Width: 5.2” (132 mm), Depth: 4.5” (114 mm)

    Display

    Alphanumeric OLED display. 8 characters per line;
    2 lines for gas concentration readout, plus user-friendly calibration and setup

    Sensor Rating

    Non explosion proof construction, designed for Class I, Div. 2, Groups B, C, D (no certification)

    Housing J-Box

    NEMA 4X, explosion proof, watertight, cast aluminum with o-ring seal and epoxy powder coating

    Controls

    Magnet used for calibration functions. Calibrates without opening the housing.
    Internal push-button controls also available for calibration and setup

    Sensor

    Aluminum / Plastic (non explosion proof)

    Operating Environment

    Operating Temperature

    -4°F to 113°F
    -20°C to 45°C

    -40°F to 104°F

    -40°C to 40°C

    23°F to 104°F

    -5°C to 40°C

    14°F to 104°F
    -10°C to 40°C

    -40°F to 122°F
    -40°C to 50°C

    Relative Humidity

    5 – 95% RH non-condensing

    Location

    Indoor or outdoor

    Operating Voltage

    10 VDC – 30 VDC

    Outputs

    Analog

    Linear 4-20 mA signal, into 1000 ohms impedance max (24DC), 0 – 500 ohms max (12VDC) corresponding to 0 – full scale

    Digital

    Modbus RTU output standard, fully configurable, 2-wire RS-485, 1200 to 19.2k baud

    Controllers

    Beacon 110, Beacon 200, Beacon 410A, Beacon 800 as well as most DCS / PLC systems

    Warranty

    One year materials and workmanship

    M2A Non Explosion Proof Toxic Transmitter Sensor Ordering Information

    Part Number With J-BoxGasRangeResolutionSensor Type
    65-2648RK-NH3Ammonia (NH3)0 – 75.0 ppm0.1 ppmESM -01
    65-2648RK-AsH3Arsine (AsH3)0 – 1.50 ppm0.1 ppmESM -01
    65-2670RK-CL2Chlorine (Cl2)0 – 3.00 ppm0.01 ppmCT-7
    65-2670RK-CL210Chlorine (Cl2)0 – 10.0 ppm0.1 ppmCT-7
    65-2670RK-CLO2Chlorine Dioxide (ClO2)0 – 1.00 ppm0.01 ppmCT-7
    65-2648RK-HCNHydrogen Cyanide (HCN)0 – 15.0 ppm0.1 ppmESM -01
    65-2648RK-PH3Phosphine (PH3)0 – 1.00 ppm0.01 ppmESM -01
    65-2648RK-SO2Sulfur Dioxide (SO2)0 – 6.00 ppm0.01 ppmESM -01

    *Partial pressure sensor for helium (He) applications. Consult factory for details.

    Specifications subject to change without notice.
    Made in the USA

    M2A Literature

    Product Datasheet
    M2A Datasheet
    M2A Product Datasheet
    Spanish M2A Datasheet

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