The RKI Instruments M2A-XL Stand Alone Transmitter is a fixed gas detection transmitter designed for stand-alone use or integration with a controller, PLC, or DCS.
It supports industrial gas detection applications that require local gas concentration readout, output signals, programmable alarms, and transmitter-based configuration in one field-mounted device.
The M2A-XL is available for combustible gases, oxygen, carbon monoxide, hydrogen sulfide, carbon dioxide, methane, hydrocarbons, and selected toxic gases.

It includes a digital OLED display, 4-20 mA and Modbus outputs, alarm relay capability, and magnetic-wand calibration for non-intrusive field adjustment.
Key Characteristics
- Operates with or without a controller for stand-alone or integrated fixed gas detection system use
- Direct digital gas concentration readout with OLED display
- Standard 4-20 mA output and digital Modbus RTU output
- Two fully programmable alarm relays plus fail relay
- Non-intrusive calibration using a magnetic wand
- Available configurations for LEL, O2, H2S, CO, CO2, CH4, hydrocarbons, and selected toxic gases
- Explosion proof construction for supported configurations
Ideal Applications
- Oil and Gas: Monitors for explosive methane or hydrogen gas near drilling sites and pipelines.
- Water & Wastewater: Detects toxic hydrogen sulfide (H₂S) and chlorine (Cl₂) gases that can build up in treatment plants.
- Chemical & Petrochemical: Tracks dangerous leaks of ammonia (NH₃), carbon monoxide (CO), or carbon dioxide (CO₂) during manufacturing.
- Semiconductor & Automotive: Protects workers by finding trace toxic gases used to make computer chips or car batteries.
Product Family Includes
- M2A-XL Stand Alone Transmitter for combustible gas, oxygen, hydrogen sulfide, carbon monoxide, carbon dioxide, methane, and hydrocarbon detection
- M2A-XL toxic gas transmitter configurations for gases such as NH3, AsH3, Cl2, ClO2, HCN, NO2, PH3, and SO2
- Configurations with 4-20 mA output, Modbus RTU output, programmable alarm relays, OLED display, and magnetic-wand calibration
Industries Served
- Petrochemical Plants
- Refineries
- Water & Wastewater Treatment Plants
- Pulp & Paper Mills
- Manufacturing Facilities
- Automotive
- Semiconductor Plants
- Chemical Plants
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