Riken Keiki ES-1827I H2S Sensor

Riken Keiki ES-1827I Hydrogen Sulfide Sensor Module

The Riken Keiki ES-1827I (P/N: 176070487Ae / 9795 8064 30) is a high-precision, micro-electrochemical gas detection sensor designed specifically for toxic Hydrogen Sulfide H2S monitoring. Engineered in Japan by Riken Keiki Co., Ltd., this plug-in sensor cell is widely utilized across the marine transportation, offshore oil & gas, petrochemical, and industrial safety sectors.

Operating on advanced micro-electrochemical cell technology, the ES-1827I delivers fast response times minimal zero-drift, and high selectivity against cross-sensitive hydrocarbon background gases. It is the factory-designated replacement sensor for Riken Keiki / RKI portable multi-gas monitors utilized in critical confined-space entry and marine tanker hold inspection operations.

Model Details

• Manufacturer: Riken Keiki Co., Ltd. (Japan)
• Model Number: ES-1827I / ES-1827i
• Manufacturer Part Numbers (MPN): ES-1827I
• Sensor Type: 3-Electrode Micro Electrochemical Cell

Key Features

1. Micro-Electrochemical Architecture: Low power consumption design optimizes instrument battery longevity during multi-shift marine and industrial inspections.
2. Rapid Poison Mitigation & Recovery: Built-in catalytic guard filter prevents rapid degradation when exposed to organic vapors and mercaptans.
3. Plug-and-Play Pin Allocation: Gold-plated multi-pin terminal construction ensures reliable signal conductivity and simplified field-replacement without soldering.
4. Intrinsic Safety Compliance: Fully certified for installation in Ex-rated intrinsically safe portable gas analyzers operating in hazardous Zone 0, Zone 1, and Class I, Div 1 locations.

Industrial & Marine Applications

• Crude Oil Tankers & Chemical Carriers: Continuous ullage space, pump room, and ballast tank H2S vapor monitoring.
• Offshore Drilling Platforms & FPSOs: Personnel protection monitoring during well testing, production, and mud processing.
• Refineries & Petrochemical Facilities: Confined space pre-entry testing in hydrotreaters, flare headers, and storage tanks.
• Wastewater & Marine Sewage Systems: Atmospheric monitoring in bilge wells, sewage treatment plants (STP), and anaerobic sumps.
• Industrial Safety & First Response: Portable personal exposure protection for fire response teams and hazmat crews.

Chief Engineer’s Field Advice:

• Post-Replacement Stabilization Time: After inserting a new ES-1827I sensor into a GX-2009 or GX-2012 monitor, allow the unit to sit powered off for at least 15 to 30 minutes before powering on. Then allow a 5-minute warm-up period in clean air before attempting zero adjustment.
• Never Skip Span Calibration: Always perform a bump test and fresh span calibration using 25 ppm calibration gas following sensor replacement. Sensor response factors shift over shelf life.
• Watch Out for Acid Gas Exposure: High concentrations of or Mercaptans can temporarily cause false positive readings or zero drift. If operating in sour gas environments, perform clean air purges regularly.
• Storage Precautions: Store spare sensors between 0°C and 20°C in sealed bags with fresh desiccant. Do not expose uninstalled sensors to sub-zero temperatures below -20°C for extended periods, as electrolyte crystallization will permanently damage the membrane.

Frequently Asked Questions

How often should the Riken Keiki ES-1827I H2S sensor be calibrated?

For marine and offshore operations subject to SOLAS and class society regulations, bump testing should be conducted prior to each day’s use. Full span calibration with certified H2S calibration gas should be performed every 3 to 6 months.

Can I replace the ES-1827I sensor myself onboard a vessel?

Yes. The ES-1827I features a modular plug-in pin configuration. Power down the gas monitor, open the sensor housing door, carefully remove the old cell, remove the shorting jumper from the new ES-1827I pin set, plug it in, and reassemble. Perform a clean air zero adjustment and span calibration before returning the unit to service.

Which Riken Keiki gas monitors use the ES-1827I sensor?

The ES-1827I is compatible with Riken Keiki and RKI Instruments portable monitors including the GX-2001, GX-2003, GX-2009, GX-2012, GX-6000, HS-01, and GasWatch 2 series.