RKI Instruments S2 Fixed Gas Sensor/Transmitter

Diffusion Gas Sensor – Fixed Systems

Features

• Available gases include
  – LEL, H2S, CO, PPM H2, and CO2
  – Toxic gases include NH3, AsH3, Cl2, ClO2, HCN, & SO2
• Infrared sensor for combustibles and CO2
• Hydrogen-Specific now available
• Patented water repellent sensor coating
• 4-20 mA output
• Explosion proof construction

The RKI S2 series gas sensor/transmitters are highly reliable and very cost effective for the detection of common gas
hazards. The S2 series are available for LEL, H2 Specific (LEL, and ppm), Oxygen, H2S, CO, and for a variety of toxic
gases. The transmitters for LEL, H2 Specific, Oxygen, H2S, CO2, and Carbon Monoxide are explosion-proof with flame
arrestors, and approved for use in hazardous areas (Class l, Div 1 Groups B, C, D). An optional non-explosion proof
version is available for oxygen, H2S, CO, and CO2 in Class 1 Div 2. LEL sensors are available using catalytic bead and
infrared technologies.

The toxic sensors are electrochemical type plug-in sensors, which provide high specificity, fast response, and long life.
The plug-in design allows quick replacement in the field with no tools required. Toxic sensors are designed for use in
Class I, Div. 2 hazardous locations. Sensors available for NH3, AsH3, Cl2, ClO2, HCN, PH3, and SO2.

The S2 transmitters can be used either indoors or outdoors. The flame arrestors for the explosion-proof versions
utilize a patented coating which make them water repellent. Splash guards are also available for use in very wet
environments. An optional stainless steel junction box is available for corrosive environments.

All of the S2 transmitters are designed to interface with RKI controllers, or with PLC/DCS systems.

Applications:

• Petrochemical Plants
• Refineries
• Gas Plants
• Offshore Drilling Platforms
• Water & wastewater treatment plants
• Pulp & paper mills
• Gas, telephone, & electric utilities
• Parking garages
• Manufacturing facilities
• Steel
• Automotive
• Chemical storage buildings