Riken Keiki GE-4641-S2 Gas Detector Sensor

Riken Keiki GE-4641-S2 Gas Detector Sensor

The Riken Keiki GE-4641-S2 (Part Number: 94-0014) is an industrial and marine-grade gas detection sensor assembly manufactured by Riken Keiki Co., Ltd. in Japan. Engineered for continuous hazardous gas monitoring, early leak mitigation, and integration into fixed gas sampling systems, the GE-4641-S2 provides rapid response characteristics with exceptional zero-point stability.

Constructed specifically to withstand heavy mechanical vibration, broad thermal fluctuations, and corrosive atmospheric conditions (saline/hydrocarbon vapors), this sensor provides critical input signals to shipboard centralized monitoring consoles, sampling extraction cabinets, and industrial process control loops.

Technical Specifications: Riken Keiki GE-4641-S2

Key Features

1. High-Precision Wheatstone Bridge Sensing Element: Provides rapid linear millivolt response to combustible gas mixtures while rejecting baseline environmental shifts.
2. Ultra-Compact & Rugged Architecture: Engineered into a 60g profile with integrated sintered metal flame mitigation for hazardous zone deployments.
3. Exceptional Zero-Point & Span Stability: Minimizes signal drift during prolonged maritime deployments and high-vibration continuous operation.
4. Corrosion & Poison-Resistant Chemistry: Specially treated to resist silicone, sulfur, and halogen poisoning commonly encountered in marine fuel manifolds and industrial processing.
5. Plug-and-Play Marine Standard Form Factor: Directly retrofittable into standardized Riken Keiki fixed transmitter heads and automated multi-point extraction cabinets.

Compatible Transmitter Heads & Extraction Units

• Riken Keiki Multi-Point Gas Sampling Systems: Suction-type cabinets installed on LNG/LPG carriers, chemical parcel tankers, and crude oil tankers (e.g., GP-series sampling drawers, GD-series heads).

• Fixed Transmitter Heads: Compatible with Riken Keiki GD-series (including GD-D, GD-F, GD-A standard flow chambers), SD-series fixed heads, and multi-point switch units.

• Marine Bridge & Control Room Consoles: Direct compatibility with Riken Keiki centralized alarm panels and safety shutdown interlocks.

Applications

• Marine Cargo Pump Rooms & Double Bottoms: Monitoring hydrocarbon vapor accumulation in classified hazardous zones.
• LNG / LPG / Chemical Tanker Extraction Systems: Multi-point gas sampling in void spaces, ballast tanks, and cofferdams.
• Offshore Oil & Gas Rigs & FPSOs: Enclosed module combustible leak detection and automated deluge/ventilation tripping.
• Refineries & Petrochemical Processing: Pipeline manifolds, valve racks, and compressor shelter ambient safety monitoring.
• Industrial Fuel Gas Delivery & Boiler Enclosures: Early gas detection for commercial power generation and marine boiler burner fronts.

Frequently Asked Questions

What is the primary function of the Riken Keiki GE-4641-S2 sensor?

The GE-4641-S2 is a replacement gas detector sensor unit designed to measure concentrations of combustible hydrocarbons in marine and industrial sampling cabinets and fixed detector heads.

How often should the Riken Keiki GE-4641-S2 be calibrated?

Class societies and standard industrial safety guidelines recommend span calibration and functional bump testing every 3 to 6 months, or immediately following any significant over-range gas exposure event.

What causes zero drift on the GE-4641-S2?

Zero drift is commonly caused by severe ambient temperature shifts, high mechanical vibration degrading internal balance, prolonged exposure to background volatile organic compounds (VOCs), or condensation settling across the sensing element membrane.

Can the GE-4641-S2 replace older GE series sensor units directly?

Yes, provided the parent detector head or drawer unit accepts the 94-0014 / GE-4641 form factor and the bridge circuit voltage is calibrated according to OEM specifications. Check the pin layout and terminal connections prior to installation.