RKI M2A Detector Head
Stand Alone Explosion Proof Transmitter
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, AsH3, Cl2, ClO2, HCN, NO2, & SO2 - 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)
Description
M2A Datasheet [PDF]
M2A Operator’s Manual [PDF]
The original M2A has been replaced with the M2A-XL Stand Alone Transmitter. The M2A-XL has an alternate housing, which is slightly taller, wider and deeper, but the electronics and operation are the same as the original M2A housing. Since this housing is deeper than the original M2A, longer standoffs are required inside to properly bring the display up to the transmitter’s window.
Changes related to using the new, alternate housing are outlined below:
- M2A-XL is the new model name for the original M2As installed in the larger housing. The new model name is visible on the label around the display.
- The Manual is different. The dimensional drawings have been revised to reflect the larger enclosure.
- New part numbers are utilized for the M2A-XL. The letters “XL” are replacing the “RK” within the former M2A part #’s.
- Inside the M2A-XL the electronics and operation are exactly the same as the original M2A.
- The only difference is the larger enclosure.
- The original M2A has been discontinued. As a result, the original M2A sections of the current price book were removed and replaced with the M2A-XL price list sections.
Related Services
- Design, Consultations, and Engineering
- Installation
- Start-up
- Training
- System Maintenance
Application
- Petrochemical plants
- Refineries
- Water & wastewater treatment plants
- Pulp & paper mills
- Manufacturing facilities
- Automotive
- Semiconductor plants
- Chemical plants
Specifications – Explosion Proof Transmitters (Class I, Div. 1 , Groups B, C, D)
| Combustibles | LEL H2 Specific |
O2 Oxygen |
H2S Hydrogen Sulfide |
CO Carbon Monoxide |
CH4 Methane |
HC Hydrocarbons |
CO2 Carbon Dioxide |
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| 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 ppmCH4 |
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 |
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| 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 |
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| 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 | C CSA US | |||||||||||
| 65-2640RK-05 C CSA US |
65-2641RK-05 C CSA US |
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| Controllers | Beacon 110, Beacon 200, Beacon 410A, Beacon 800 as well as most DCS / PLC systems | |||||||||||
| Warranty | One year material and workmanship | |||||||||||
Specifications – Toxic Gas Transmitters (Class I, Div. 2)
| O2 Oxygen |
H2S Hydrogen Sulfide |
CO Carbon Monoxide |
Toxics | 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 | |||||
| Part Number With J-Box | Gas | Range | Resolution | Sensor Type |
| 65-2670RK-NH3-75 | Ammonia (NH3) | 0 – 75.0 ppm | 0.1 ppm | CT-7 |
| 65-2670-NH3-1 | Ammonia (NH3) | 0 – 100 ppm | 1 ppm | CT-7 |
| 65-2670-NH3-2 | Ammonia (NH3) | 0 – 200 ppm | 1 ppm | CT-7 |
| 65-2670-NH3-5 | Ammonia (NH3) | 0 – 500 ppm | 1 ppm | CT-7 |
| 65-2670-NO2 | Nitrogen Dioxide (NO2) | 0 – 15.0 ppm | 1 ppm | CT-7 |
| 65-2648RK-AsH3 | Arsine (AsH3) | 0 – 1.50 ppm | 0.1 ppm | ESM -01 |
| 65-2670RK-CL2-3 | Chlorine (Cl2) | 0 – 3.00 ppm | 0.01 ppm | CT-7 |
| 65-2670RK-CL2-10 | Chlorine (Cl2) | 0 – 10.0 ppm | 0.1 ppm | CT-7 |
| 65-2670RK-CLO2 | Chlorine Dioxide (ClO2) | 0 – 1.00 ppm | 0.01 ppm | CT-7 |
| 65-2648RK-HCN | Hydrogen Cyanide (HCN) | 0 – 15.0 ppm | 0.1 ppm | ESM -01 |
| 65-2648RK-PH3 | Phosphine (PH3) | 0 – 1.00 ppm | 0.01 ppm | ESM -01 |
| 65-2648RK-SO2 | Sulfur Dioxide (SO2) | 0 – 6.00 ppm | 0.01 ppm | ESM -01 |
