Explosion Proof
M2A Series Explosion Category
- Description
- Features
- Applications
- Specifications
- Documentation
- Replacement Sensors
- Accessories
- Calibration Kits
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) | Combustibles (PPM) | LEL (H2 Specific) | O2 (Oxygen) | H2S (Hydrogen Sulfide) | CO (Carbon Monoxide) | CH4 (Methane) | HC (Hydrocarbons) | CO2 (Carbon Dioxide) | |
|---|---|---|---|---|---|---|---|---|---|
| Part # | 65-2640RK | 65-2647RK | 65-2641RK | 65-2643RK-05 | 65-2645RK-05 | 65-2646RK-05 | 65-2649RK-CH4 | 65-2649RK-HC | 65-2660RK-02 |
| 65-2640RK-05 | 65-2647RK-05 | 65-2641RK-05 | 65-2658RK-CH4 | 65-2660RK-03 | |||||
| 65-2660RK-05 | |||||||||
| 65-2660RK-10 | |||||||||
| 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% LEL | -02: 0 - 5000 ppm |
| 0 - 100% Vol. | -03: 0 - 5% Vol. | ||||||||
| -05: 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 | -4°F to 113°F | -40°F to 104°F | 23°F to 104°F | -40°F to 122°F | ||||
| -40°C to 75°C | -20°C to 45°C | -40°C to 40°C | -5°C to 40°C | -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 | ||||||||
| M2A Wiring Matrix | ||||
|---|---|---|---|---|
| Number of Wires to Controller | Maximum Distance to Controller | |||
| 18 AWG wire | 16 AWG wire | 14 AWG wire | ||
| M2A Transmitter | 3 | 2500 ft. | 5000 ft. | 8000 ft. |