Riken Keiki 4X-0149M HW-6214(P) Combustible Gas Sensor

Riken Keiki 4X-0149M Combustible Gas Sensor (P/N: HW-6214(P))

The Riken Keiki 4X-0149M (P/N: HW-6214(P)) is an industrial-grade catalytic combustion gas sensor element for fixed and portable gas monitoring systems in maritime, offshore and hazardous petrochemical applications. This sensor element employs the catalytic bead (pellistor) principle in a balanced Wheatstone bridge arrangement to give a linear output voltage proportional to Lower Explosive Limit (%LEL) gas concentrations.

The HW-6214(P) is designed to meet stringent SOLAS requirements for vessel atmosphere safety, pump room monitoring and cargo hold leak detection and features an improved poison resistant ceramic element coating to deal with volatile organic compounds (VOCs), silicones and sulfur compounds commonly found in marine fuel handling and inerted cargo spaces.

Key Features

1. Poison-Resistant Ceramic Element: Utilizes Riken Keiki’s proprietary ceramic catalyst coating to prevent sensitivity loss caused by silicone, lead, or halogenated compounds.
2. Integral Sintered Flame Arrestor: Stainless steel porous sinter prevents internal ignition propagation into surrounding hazardous explosive atmospheres.
3. Matched Active/Compensating Pair: Twin-bead pellistor architecture cancels ambient temperature and humidity drift for baseline zero stability.
4. Rapid T90 Dynamic Response: Achieves rapid lower explosive limit warning within 20 seconds of hydrocarbon gas ingress.
5. Marine-Grade Vibration Resistance: Built to withstand continuous engine-room structural vibration, thermal cycling, and high-salinity ambient air.

Compatible Equipment Models

The Riken Keiki HW-6214(P) / 4X-0149M sensor element is compatible with the following transmitter heads, fixed monitors, and portable detection systems:

• Riken Keiki Fixed Transmitter Heads: GD-A8 Series, GD-A8-N, GD-A8V, GD-F8, SD-1 Series (Combustible Gas Heads)
• Marine Multi-Gas Sampling Systems: RX-515, RX-517, RX-8000 Series (Specific catalytic sensor blocks)
• Industrial Gas Detectors: VCM Detection Units (using HW-6214B sensor modules)
• Main Control Panels: Riken Keiki RM-5000, RM-6000, and NC-1000 Series Gas Monitoring Panels

Part Number Cross-References & Identifiers

• Riken Keiki Model Code: 4X-0149M
• Riken Keiki Part Number: HW-6214(P) / HW6214P
• Alternative Manufacturer Codes: 24-0034, 24-0035, HW-6214B
• System Component Code: RKK-HW6214P-SEN

Product Applications

1. Marine Vessel Cargo Pump Rooms: Fixed flammable gas detection systems under SOLAS Chapter II-2 regulation.
2. LNG / LPG Carrier Ballast & Void Spaces: Continuous inert gas and combustible hydrocarbon leakage monitoring.
3. Offshore Oil & Gas Platforms: Deck atmosphere sampling and process module gas safety interlocks.
4. Petrochemical Refineries: Perimeter monitoring for vinyl chloride monomer (VCM), methane, and volatile solvent vapors.
5. Industrial Confined Spaces: Marine dry dock, double bottom tank, and sewage treatment plant monitoring.

Frequently Asked Questions

How often should the Riken Keiki HW-6214(P) sensor be calibrated?

The Riken Keiki HW-6214(P) sensor should undergo span calibration every 6 months using a certified standard calibration gas mixture (e.g., 50% LEL Methane or 50% LEL Iso-butane in air). In harsh marine environments with high salt mist or chemical exposure, 3-month bump testing intervals are recommended.

What is the typical lifespan of the HW-6214(P) catalytic sensor element?

Under standard operating conditions, the HW-6214(P) catalytic element has an operational life expectancy of 3 to 5 years. Lifespan depends on continuous exposure to trace combustible gases, ambient humidity, and absence of catalytic poisons like silicones or sulfur compounds.

Can I replace an HW-6214B or 24-0034 sensor with an HW-6214(P)?

Yes. The HW-6214(P), HW-6214B, 24-0034, and 24-0035 are cross-compatible part variants manufactured by Riken Keiki for the GD-A8 and related catalytic gas transmitter series. Always verify terminal pin orientation prior to mounting on the PCB.

What causes a “Sensor Failure” fault on the controller after installing a new HW-6214(P)?

A sensor failure or open-circuit fault usually indicates incorrect terminal soldering, broken pellistor bridge wires due to mechanical shock, or failure to perform zero balancing on the transmitter control board after installation.