Riken Keiki ES-037R H2S Gas Detector Sensor Cell

RIKEN KEIKI H2S GAS DETECTOR SENSOR CELL (MODEL ES-037R)

The Riken Keiki ES-037R is an industrial-grade electrochemical sensor cell designed for targeted measurement of Hydrogen Sulfide in severe marine and offshore industrial environments. Designed by Riken Keiki Co., Ltd. (Japan), this plug-in sensor cell integrates into portable multi-gas monitors (such as the GX-8000 and RX-517 series) and fixed gas detection transmitters across marine vessels, crude oil tankers, chemical carriers, and offshore rigs.

Featuring rapid response dynamics and high selectivity against interfering hydrocarbons, the ES-037R prevents false alarms while providing real-time concentration readouts in parts-per-million (ppm). Constructed with corrosion-resistant gold-plated contacts and a sealed PTFE membrane interface, it handles high-humidity pump-sampling tasks, ballast tank inspections, and enclosed space entry logging under SOLAS Chapter VI/XI-1 regulations.

Model Details

• Manufacturer: Riken Keiki Co., Ltd. (Made in Japan)
• Model Number: ES-037R
• Manufacturer Part Number (MPN): ES-037R / 0105834AE
• Series Reference / Sub-variant: 449015660AE / SV 1 8N

Compatibility

The Riken Keiki ES-037R sensor unit is engineered for direct drop-in integration with the following Riken Keiki portable and fixed gas detection instruments:

• Portable Multi-Gas Detectors:
• Riken Keiki GX-8000 Series (Sampling pump equipped)
• Riken Keiki RX-517 / RX-515 Hydrocarbon and H2S Monitor.
• Riken Keiki GX-2009 / GX-8000 LEL / O2 / CO / H2S

Part Number Cross-References

• Riken Keiki Primary Part No.: ES-037R
• Alternative Factory Codes: 0105834AE, 449015660AE
• Compatible Sensor Variant: ES-037i (Intrinsically Safe intrinsic variant series)

Key Features

1. High Selectivity Electrochemical Cell: Minimizes cross-sensitivity to Mercaptans, Sulfur Dioxide SO2 and volatile organic compounds commonly found in crude cargo holds.
2. Rapid Response Profile: Delivers alert in under 30 seconds to provide early evacuation warnings for dangerous H2S surges
3. Heavy-Duty Marine Design: Equipped with gold-plated contact pins to resist salt-mist corrosion and vibration fatigue in shipboard pump manifolds.
4. Direct Drop-In Plug & Play Replacement: Factory pre-calibrated baseline allows rapid field replacement without complex hardware rebuilding.
5. Wide Thermal Tolerance: Operates reliably from sub-zero Arctic ballast holds (-20°C) to tropical engine room manifolds (+50°C).

Applications

• Crude Oil Tanker Operations: Monitoring cargo tank washing (COW), ullage space testing, and vapor return lines.
• Enclosed Space Entry (SOLAS Regulation XI-1/1): Testing atmosphere inside ballast tanks, chain lockers, cofferdams, and fuel storage areas.
• Chemical Carrier Cargo Monitoring: Detecting sour gas byproduct leaks in pump rooms and manifold areas.
• Offshore Oil & Gas Rigs: Personal and fixed area safety monitoring during drilling, production, and mud handling.
• Refineries & Marine Fuel Terminals: Pipe gallery inspection and bunker barge safety verification.

Chief Engineer’s Maintenance & Installation Guide

1) Handling Electrochemical Sensor Moisture:

When swapping the ES-037R into a GX-8000 or RX-517 monitor, ensure the internal hydrophobic filter ring is inspected. Water or oil condensate entering the sensor manifold will block gas diffusion through the PTFE membrane, leading to false low readings or complete sensor dead-out during ballast tank checks.

2) Zero Calibration Protocol in Marine Atmospheres:

Always perform the fresh-air zero calibration on clean deck air before entering cargo holds or pump rooms. Never zero the sensor inside an enclosed space where low-level background H2S or hydrocarbon vapors might be present, as this offsets the baseline and masks lethal concentrations.

3) Cross-Sensitivity & Poisoning Precautions:

While the ES-037R features filter layers to block typical interfering gases, high concentrations of siloxanes, heavy solvents, or prolonged exposure to extreme dry air can dry out the electrolyte solution. If your unit has been stored in dry warehouse air for over 6 months, allow 2 to 4 hours in ambient humidity before running a calibration bump test.

4) Storage and Shelf Life Management:

Maintain spare ES-037R sensors in sealed ESD bags between 5°C and 25°C. Storing spare sensors in hot engine store-rooms above 45°C significantly degrades electrolyte volume, shortening operational life before the unit is even deployed.

Frequently Asked Questions

What gas does the Riken Keiki ES-037R detect, and what is its range?

The Riken Keiki ES-037R is specifically calibrated to detect Hydrogen Sulfide H2S gas across a standard detection range of 0.0 to 100.0 ppm with a high-resolution electrochemical measurement mechanism.

How often should the Riken Keiki ES-037R sensor be bump-tested and calibrated?

In accordance with SOLAS marine safety standards and manufacturer recommendations, a bump test should be performed prior to each day’s use or enclosed space entry. Full span calibration using certified H2S calibration gas should be conducted every 3 to 6 months.

What is the average lifespan of an ES-037R H2S sensor cell?

Under typical marine operating conditions, the ES-037R has an expected operational lifespan of 24 to 36 months. High continuous exposure to H2S or extreme high-temperature environments may accelerate electrolyte consumption.

Can the ES-037R sensor be replaced onboard by vessel crew?

Yes, the ES-037R is a modular plug-in sensor cell. Vessel crew can replace the cell by opening the sensor housing compartment on compatible monitors, removing the old cell, inserting the new unit, and running a fresh-air zero and span gas calibration.

What is the difference between ES-037R and ES-037i?

Both sensors share similar electrochemical detection principles for H2S However, the “R” and “i” suffixes denote specific internal housing configurations, pin orientations, and intrinsic safety circuit matching for different instrument model series (such as GX-8000 vs. legacy fixed systems). Check your host unit manual to verify exact suffix compatibility.