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SKU: RKI01-65-2650XL

RKI M2A-XL MPS type LEL Sensor/Transmitter with J-Box 65-2650XL

$2,019.23

Ships in 6 - 8 weeks

Description

RKI M2A-XL Molecular Property Spectrometer (MPS) LEL Sensor/Transmitter is an explosion-proof transmitter that can operate as a standalone system or as part of a system connected with an analog or digital signal to a controller, PLC, or DCS. The M2A-XL utilizes a magnetic wand technique for performing non-intrusive calibration. The housing does not need to be opened for zeroing or calibration.

RKI’s Molecular Property Spectrometer LEL Sensor internally identifies the gas or gases being detected and applies the appropriate LEL conversion factor, allowing it to read a variety of flammable gases or vapors correctly using only a methane calibration gas. Capable of detecting over a dozen different combustible gases simultaneously — including Hydrogen — the MPS sensor is designed for reliability, accuracy, and worker safety in demanding fixed-gas applications. Expected sensor life is over 10 years in normal applications.

Key Features:

Direct digital readout
Explosion-proof housing
Operates independently or with any controller, PLC, or DCS
4–20 mA transmitter output (65-2650RK)
Digital Modbus output
Operates from 10–30 VDC
2 programmable alarm relays plus fail relay
Auto zero drift correction
Non-intrusive calibration via magnetic wand

Sensor Features:

Responds accurately to over 14 combustible gases with calibration to methane only
No gas-specific conversion factors required
Immune to sensor poisons including H2S, silicone, and HCFCs
Requires only annual field response checks
Suitable for use in high humidity conditions
Explosion-proof approval CULUS
Long sensor life (10+ years in normal applications)
Two-year warranty on the sensor (1 year on electronics)

Applications:

Environments where silicone contamination is present
High humidity applications where IR or catalytic sensing may not hold up
Locations where a mixture of hydrocarbons could be present
H2 applications where catalytic sensor poisoning is a concern

Specification Sheet:

Part Number:
65-2650XL – LEL, M2A-XL, MPS-type sensor/transmitter with J-Box

Frequently Asked Questions

How does the Molecular Property Spectrometer (MPS) sensor differ from catalytic bead sensors?

Traditional catalytic bead (pellistor) sensors rely on the oxidation of combustible gas on a platinum filament to measure LEL. They are susceptible to poisoning by silicone compounds, H2S, and HCFCs, and they require gas-specific conversion factors for each hydrocarbon. The MPS sensor uses infrared-based molecular property analysis to internally identify the gas being detected and apply the correct LEL conversion factor automatically. This means accurate readings across 14+ combustible gases with a single methane calibration, and immunity to common catalyst poisons, resulting in a significantly longer service life.

What combustible gases can the M2A-XL MPS sensor detect?

The M2A-XL MPS sensor responds accurately to over 14 combustible gases with a single methane calibration — including methane, propane, butane, ethylene, hydrogen, isobutylene, and many other hydrocarbons. No gas-specific conversion factors are required. For a full list of gases the MPS responds to, refer to the Specification Sheet linked above or call PK Safety at 800.829.9580.

What is the expected lifespan of the MPS sensor in the M2A-XL?

RKI rates the MPS sensor for over 10 years of service life in normal applications, significantly outlasting conventional catalytic bead sensors that typically require replacement every 2–4 years. The sensor also requires only annual field response checks rather than quarterly calibration, reducing both maintenance labor and calibration gas consumption over the life of the installation. The transmitter electronics carry a 1-year warranty; the sensor carries a 2-year warranty.

How does non-intrusive calibration work on the M2A-XL?

The M2A-XL uses a magnetic wand technique to activate the calibration mode from outside the housing. No tools and no housing entry are required for zeroing or span calibration — a significant safety and operational advantage in classified locations, because the housing can remain closed and sealed while calibration is performed. This reduces the risk of introducing ignition sources or moisture into the explosion-proof enclosure during calibration.

Does PK Safety integrate or service RKI M2A-XL transmitters?

PK Safety services RKI instruments in-house with factory-trained technicians, including the M2A-XL MPS transmitter. We support integration with RKI controllers including the Beacon 800 and Beacon 410A, and with third-party PLC/DCS systems via 4–20 mA or Modbus. Call our fixed-gas detection specialists at 800.829.9580 for installation guidance, controller compatibility questions, or service scheduling.

What applications benefit most from MPS-type LEL sensing?

MPS sensing excels in environments hostile to catalytic bead sensors: facilities with silicone-based compounds (semiconductor fabs, HVAC shops), high-humidity industrial settings (wastewater plants, chemical process areas), locations with mixed hydrocarbon streams where a single calibration gas must cover many target gases, and H2 applications such as battery rooms, fuel cell facilities, or hydrogen generation plants where silicone and H2S poisoning of conventional pellistors is a documented problem. See PK Safety’s fixed gas detectors collection for related products.

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