M2A Stand Alone Non-Explosion Proof Transmitter

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M2A Stand Alone Non-Explosion Proof Transmitter

The RKI M2A is a state-of-the-art transmitter that can operate as an independent, stand-alone system 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 LCD menus. It utilized a magnetic wand technique for performing non-intrusive calibration. The M2 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, 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.

Features:

  • Operates with or without a controller
  • Direct digital readout on backlit LCD
  • Available gases include
    • % LEL, H2S, CO, PPM HC & CO2
  • 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 & LCD menus
  • Long-life sensors (2+ years typical)

M2A Stand Alone Non-Explosion Proof Transmitter

General Specifications

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

  • 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
  • Controllers: Beacon 110, Beacon 200, Beacon 410A, Beacon 800 as well as most DCS / PLC systems
  • Warranty: One year material and workmanship

Sensor Specifications

O2 - Oxygen (65-2666RK)

  • Type: Galvanic cell
  • Measuring Ranges: 0 - 25.0% Vol.
  • Resolution: 0.1% Vol.
  • Lower Detectable Limit: 0.1% Vol.
  • Max Current Draw (24VDC):125 mA with alarm 1 and alarm 2 active and all relays energized
  • Response Time (T-90): 35 Seconds or less
  • Life Expectancy: 2 to 3 years with normal service
  • Accuracy: ± 0.5% Vol. O2

H2S - Hydrogen Sulfide (P/N 65-2662RK)

  • Type: Electrochemical
  • Measuring Ranges: 0 - 100 ppm
  • Resolution: 1 ppm
  • Lower Detectable Limit: 2% of full scale
  • Max Current Draw (24VDC): 125 mA with alarm 1 and alarm 2 active and all relays energized
  • Response Time (T-90): 35 Seconds or less
  • Life Expectancy: 2 to 3 years with normal service
  • Accuracy: ± 5% of reading or ± 2 ppm H2S

CO - Carbon Monoxide (P/N 65-2663RK)

  • Type: Electrochemical
  • Measuring Ranges: 0 - 300 ppm
  • Resolution: 1 ppm
  • Lower Detectable Limit: 2% of full scale
  • Max Current Draw (24VDC): 125 mA with alarm 1 and alarm 2 active and all relays energized
  • Response Time (T-90): 35 Seconds or less
  • Life Expectancy: 2 to 3 years with normal service
  • Accuracy: ± 5% of reading or ± 5 ppm CO

CO2 - Carbon Dioxide (P/N 65-2661RK-02, 65-2661RK-03, 65-2661RK-05, 65-2661RK-10)

  • Type: Infrared
  • Measuring Ranges:
    • -02: 0 - 5000 ppm
    • -03: 0 - 5% Vol
    • -05: 0 - 50% Vol
    • -10: 0-100% Vol
  • Resolution: 20 ppm / 0.1% Vol. / 1% Vol.
  • Lower Detectable Limit: 2% of full scale
  • Max Current Draw (24VDC): 160 mA with alarm 1 and alarm 2 active and all relays energized
  • Response Time (T-90): 30 Seconds or less
  • Life Expectancy: 5 years plus with normal service
  • Accuracy: ± 5% of reading or ± 2 % of full scale

Toxic Gases

Gas P/N Resolution Sensor
0 - 75ppm Ammonia (NH3) 65-2648RK-NH3 0.1 ppm ESM -01
0 - 75ppm Arsine (AsH3) 65-2648RK-AsH3 0.1 ppm ESM -01
0 - 3.0ppm Chlorine (Cl2) 65-2670RK-CL2 0.01 ppm CT-7
0 - 10ppm Chlorine (Cl2) 65-2670RK-CL210 0.1 ppm CT-7
1 - 1.0ppm Chlorine Dioxide (ClO2) 65-2670RK-CLO2 0.01 ppm CT-7
0 - 15.0ppm Hydrogen Cyanide (HCN) 65-2648RK-HCN 0.1ppm ESM -01
0 - 1.0ppm Phosphine (PH3) 65-2648RK-PH3 0.01 ppm ESM -01
0 - 6.0ppm Sulfur Dioxide (SO2) 65-2648RK-SO2 0.01 ppm ESM -01

M2A Stand Alone Non-Explosion Proof Transmitter

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