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RKI Instruments S2 Series IR Carbon Dioxide (CO2) 0 - 100%, Non Explosion Proof with J-Box - 65-2397RK-10

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RKI Instruments S2 Series IR Carbon Dioxide (CO2) 0 - 100%, Non Explosion Proof with J-Box - 65-2397RK-10

RKI Instruments S2 Series IR Carbon Dioxide (CO2) 0 - 100%, Non Explosion Proof with J-Box - 65-2397RK-10


65-2397RK-10 S2 Series IR Carbon Dioxide (CO2) 0 - 50%, Non Explosion Proof with J-Box by RKI Instruments

Having a reliable gas sensor is detrimental to the safety and security of workers in potentially unstable work environments. In many cases, the decision to use a gas detection device with a reliable sensor can be the difference between life and death. RKI Instruments understands the reliability of gas sensors should be a top priority for workplace safety managers. Their team of experts works diligently to incorporate the most advanced technologies with the highest industry standards.

For nearly 20 years, RKI Instruments has worked in the gas detection industry. Its line of products leads the industry in innovation and technology. Every year, the company commits to achieving a higher level of productivity and delivering the best gas detection products on the market. With the introduction of their high performing, low cost S2 Sensor Transmitter, RKI is fulfilling that commitment.

S2 Sensor/Transmitter

The RKI S2 Sensors and Transmitters use state of the art sensor technology to detect common gas hazards. Their efficient design and cost effectiveness make them an industry choice for atmospheric monitoring. The sensor transmitters can be used in both indoor and outdoor conditions and are designed to interface with RKI controllers or PLC/DCS systems.

The sensors are available in explosion proof casing for monitoring LEL, H2 specific, oxygen, H2S, CO2, and carbon monoxide. These sensors also have flame arrestors and are approved for use in hazardous environments. The oxygen, H2S, CO, and CO2 sensors are available in non-explosion proof models. The sensors provide highly specific and quick detection and are long lasting. The sensors can be quickly replaced while on the field and do not require any tools.

Explosion proof S2 Sensor/Transmitter

The explosion proof sensors use a variety of detection mechanisms including catalytic for LEL and LEL- H2 specific; metal oxide semiconductor for hydrogen; galvanic cell technology for oxygen; electrochemical for hydrogen sulfide and carbon monoxide; and infrared for carbon dioxide, methane, and hydrocarbons. A hydrogen specific sensor transmitter is not available. Each of these detection methods come with their own measuring range specifications and response times varying from 20 seconds to 45 seconds. These sensors are stainless steel and are housed in a cast aluminum explosion proof J-Box (a stainless steel J-Box is also available).

Non-explosion proof S2 Sensor/Transmitter

The non-explosion proof sensors use galvanic cells for oxygen detection; electrochemical technology for hydrogen sulfide, carbon monoxide, and other toxics; and infrared technology for carbon dioxide detection. The response times vary between 20 seconds and 60 seconds depending on the targeted gas, and the measuring ranges vary as well. These sensors are plastic or aluminum and housed in an explosion proof J-Box.


The S2 Sensor/Transmitter has numerous accessories available to meet the individual workplace's needs. Such accessories include calibration adaptors, flow through adaptors, remote horns and lights, calibration kits, battery backups, splash guards, air aspirator adaptors or panels, and data loggers.

Each sensor comes standard with a one year warranty for materials and workmanship.

*Please note we can only ship RKI products to customers within the United States

Non-Explosion Proof Specifications:
Non-Explosion Proof
O2 Oxygen
H2S Hydrogen Sulfide
CO Carbon Monoxide
Toxics See chart below
CO2 Carbon Dioxide
Part #
See chart below
Galvanic cell
Measuring Range
0-25% Vol.
0-100 ppm
0-300 ppm
See chart below
0 - 5000 ppm
0 - 5% Vol.
0 - 50% Vol.
0 - 100% Vol.
Lower Detectable Limit (LDL)
0.1% Vol.
2% of full scale
± 5% of full scale (0.5% volume for oxygen)
Life Expectancy
2 years normal
2 to 3 years with normal service
5 years plus with normal service
Response Time (T-90)
20 Seconds
45 Seconds
30 Seconds
60 Seconds
30 Seconds
Operating Environment
Indoor Class I, Div. 2
-4°F to 122°F -20°C to 50°C
14°F to 104°F -10°C to 40°C
-4°F to 122°F -20°C to 50°C
0 - 99% RH non condensing
5-95% RH
0 - 99% RH non condensing
Housing J-Box
Cast aluminum, explosion-proof
Plastic or aluminum
Sets transmitter output to 4 mA with zero output from sensor
Sets transmitter output to 20 mA with full scale output from sensor
Operating Voltage
19 VDC to 30 VDC
4-20 mA signal
Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410, and 800, also PLC and DCS systems
One year materials and workmanship

Ordering Information:
Non Explosion Proof Toxic Assemblies
Part Number
Arsine (AsH3)
0 - 1.5 ppm
Ammonia (NH3)
0 - 75 ppm
Chlorine (Cl2)
0 - 3.00 ppm
Hydrogen Cyanide (HCN)
0 - 15 ppm
Phosphine (PH3)
0 - 1.00 ppm
Sulfur Dioxide (SO2)
0 - 6.00 ppm

S2 Wiring Matrix:
S2 Transmitter
Number of Wires to Controller
Maximum Distance to Controller
18 AWG wire
16 AWG wire
14 AWG wire
LEL / IR / CO2
2500 ft.
5,000 ft.
8,000 ft.
2500 ft.
5,000 ft.
8,000 ft.
2500 ft.
5,000 ft.
8,000 ft.
2500 ft.
5,000 ft.
8,000 ft.
2500 ft.
5,000 ft.
8,000 ft.

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