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Open Source Steel M2A, LEL 0-100% Sensor (Catalytic) / Transmitter with j-box, (specifically calibration), UL version
$1,235.00
M2A Stand Alone Sensor
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.
Features
- Operates with or without a controller
- Direct digital readout with OLED cold temperature display
- Available gases include LEL, O2, H2S, CO, CO2, and 100% Vol 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)
*Please note we can only ship RKI products to customers within the United States
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LEL
General Purpose |
LEL
H2 Specific |
O2
Oxygen |
H2S
Hydrogen Sulfide |
CO
Carbon Monoxide |
CH4
Methane |
HC
Hydrocarbons |
CO2
Carbon Dioxide |
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| Part# |
65-2640RK
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65-2641RK
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65-2643RK-05
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65-2645RK-05
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65-2646RK-05
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65-2649RK-CH4
65-2658RK-CH4 |
65-2649RK-HC
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65-2660RK-02
65-2660RK-03 65-2660RK-05 65-2660RK-10 |
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65-2640RK-05
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65-2641RK-05
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| Sensors |
Catalytic
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Galvanic cell
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Electrochemical
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Infrared
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| Measuring Ranges |
0 – 100 % LEL
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0 – 25.0% Vol.
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0 – 100 ppm
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0 – 300 ppm
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0 – 100% LEL
0 – 100% Vol. |
0 – 100% LEL
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-02
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0 – 5000 ppm
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-03
-05 |
0 – 5% Vol.
0 – 50% Vol. |
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-10
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0 – 100% Vol.
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| Resolution |
1% LEL
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0.1% Vol.
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1 ppm
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1% LEL / 1% Vol.
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20 ppm / 0.1% Vol. / 1% Vol.
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| Lower Detectable Limit (LDL) |
2% of full scale
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0.1% Vol.
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2% of full scale
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| Max Current Draw (24VDC) |
160 mA with alarm 1 and alarm 2 active and all relays energized
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125 mA with alarm 1 and alarm 2 active and all relays energized
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| Response Time (T-90) |
35 Seconds or less
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30 Seconds or less
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| Life Expectancy |
2 to 3 years with normal service
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3 to 5 years with normal service
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2 to 3 years with normal service
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5 years plus with normal service
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| Accuracy (which ever is greater) |
± 5% of reading or ± 2 % LEL
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± 0.5% Vol. O2
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± 5% of reading or ± 2 ppm H2S
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± 5% of reading or ± 5 ppm CO
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± 5% of reading or ± 2 % of full scale
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| Weather Resistant |
Patented water repellent sensor coating
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| Alarms
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| Alarm Settings |
Two fully programmable alarm set points, increasing / decreasing, latching / self-resetting, on delays, off delays, normally energized or de-energized
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| Alarm Indication |
Visual LEDs. Alarm 1, Amber; Alarm 2, Red; Fail, Red
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| Relays |
5 amp form ‘C’ contacts for alarm 1, alarm 2, and fail
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| Physical
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| Dimensions |
Height: 8.5″ (215 mm), Width: 5.2″ (132 mm), Depth: 4.5″ (114 mm)
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| Display |
Alphanumeric OLED display. 8 characters per line; 2 lines for gas concentration readout, plus user-friendly calibration and setup
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| Enclosure |
Explosion proof for Class I, Div 1, Groups B, C, D.
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| Enclosure Rating |
NEMA 4X, explosion proof, watertight, cast aluminum with o-ring seal and epoxy powder coating
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| Controls |
Magnet used for calibration functions. Calibrates without opening the housing.
Internal push-button controls also available for calibration and setup. |
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| Operating Environment
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| Operating Temperature |
-40°F to 167°F -40°C to 75°C
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-4°F to 113°F -20°C to 45°C
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-40°F to 104°F -40°C to 40°C
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23°F to 104°F
-5°C to 40°C |
-40°F to 122°F
-40°C to 50°C |
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| Relative Humidity |
5 – 95% RH non-condensing
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| Location |
Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, D.
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| Operating Voltage |
10 VDC – 30 VDC
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| Outputs |
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| Analog |
Linear 4-20 mA signal, into 1000 ohms impedance max (24DC), 0 – 500 ohms max (12VDC) corresponding to 0 – full scale
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| Digital |
Modbus RTU output standard, fully configurable, 2-wire RS-485, 1200 to 19.2k baud
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| Approvals |
65-2640RK UL
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C CSA US
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C UL US
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65-2640RK-05 C CSA US
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65-2641RK-05 C CSA US
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| Controllers |
Compatible with all RKI Beacon controllers, as well as most DCS / PLC systems:
Beacon 110, Beacon 200, Beacon 410, Beacon 800 |
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| Warranty |
One year material and workmanship
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M2A Spec Sheet
