Description
Description
The RKI M2A-XL 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-XL 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-XL 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-XL 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 toxic gases.
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 Ammonia (NH3), Arsine (AsH3), Chlorine (Cl2), Chlorine Dioxide (ClO2), Hydrogen Cyanide (HCN), Phosphine (PH3), Nitrogen Dioxide (NO2), and Sulfur Dioxide (SO2).
The M2A-XL Stand Alone Transmitter represents the latest leading edge technology in sensor / transmitters today.
Specifications
| Range |
Sensor dependent |
| Response Time |
Sensor dependent |
| Accuracy |
Generally ±10% of value, but limited by available calibration gas accuracy |
| Electronic Repeatability |
±1% of full scale |
| Electronic Linearity |
±5-10% of full scale, depends on sensor |
| Alarm Settings |
Two fully programmable alarm set points, increasing, decreasing, latching, self-resetting on delays, off delays, normally energized or de-energized |
| Alarms |
Visual LEDs, Alarm 1: amber, Alarm 2: red, Fail: red |
| Relays |
5 Amp form ‘C’ contacts for alarm 1, 2 and fail |
| Power |
10 VDC – 30VDC |
| Outputs |
Analog: Linear 4-20 mA signal, into 1000 ohms impedance max (24 DC), 0-500 ohms max (12 VDC) corresponding to 0-full scale
Digital: Modbus RTU output std, fully configurable, 2-wire RS-485, 1200 to 19.2 k Baud |
| Display |
OLED display, 8 characters per line, 2 lines for gas concentration readout, plus user-friendly calibration and set up |
| Housing |
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 |
| Enclosure |
Explosion Proof: Class 1, Div 1, Groups B, C, D
Non-Explosion Proof: Class I, Div 2, Groups B, C, D |
| Size |
6.2″ x 5.66″ x 4.86″ |
| Operating Temperature |
-4°F to 104°F up to 122°F, Sensor dependant |
| Warranty |
1 year |
Sensor Specifications
| Gas |
Range |
Resolution
|
| Ammonia |
0-75.0 ppm |
0.1 ppm |
| 0-100 ppm |
1 ppm |
| 0-200 ppm |
1 ppm |
| 0-500 ppm |
1 ppm |
| Arsine |
0-1.50 ppm |
0.1 ppm |
| Carbon Monoxide |
0-300 ppm |
1 ppm |
| Chlorine |
0-3.00 ppm |
0.01 ppm |
| 0-5.00 ppm |
0.01 ppm |
| 0-10.0 ppm |
0.1 ppm |
| Chlorine Dioxide |
0-1.00 ppm |
0.01 ppm |
|
0-1.00 ppm
|
0.01 ppm
|
| 0-3.00 ppm |
0.01 ppm |
|
0-5.00 ppm
|
0.01 ppm
|
| Combustibles* |
0-100% LEL |
1% LEL |
| 0-9,000 ppm |
20 ppm |
| Hydrocarbons* |
0-100% LEL |
1% LEL |
| Hydrogen Cyanide |
0-15.0 ppm |
0.1 ppm |
| Hydrogen Sulfide |
0-100 ppm |
1 ppm |
| Methane* |
0-100% LEL |
1% LEL |
| Nitrogen Dioxide |
0-15.0 ppm |
0.1 ppm |
| Oxygen |
0-15% Vol |
0.1% Vol |
| Phosphine |
0-1.00 ppm |
0.01 ppm |
| Sulfur Dioxide |
0-6.00ppm |
0.01 ppm |
(*) Explosion Proof Enclosure
