Explosion Proof


M2A Series Explosion Category

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.

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