S2 Series Diffusion Sensor
- Available gases include
LEL, H2S, CO, PPM H2, and CO2
Toxic gases include NH3, SO2, HCN, and more - Infrared sensor for combustibles and CO2
- Hydrogen-Specific now available
- Patented water repellent sensor coating
- 4-20 mA output
- Explosion proof construction
- Optional stainless steel junction box
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, Groups B, C, D). An optional non-explosion proof version is available for oxygen, H2S, CO, and CO2 in non-hazardous atmospheres. 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, SO2, PH3, AsH3, and HCN.
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.
- Available gases include
LEL, H2S, CO, PPM H2, and CO2
Toxic gases include NH3, SO2, HCN, and more - Infrared sensor for combustibles and CO2
- Hydrogen-Specific now available
- Patented water repellent sensor coating
- 4-20 mA output
- Explosion proof construction
- Optional stainless steel junction box
- 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
Explosion Proof Specifications
LEL General Purpose | LEL H2 Specific | H2 PPM Hydrogen | O2 Oxygen | H2S Hydrogen Sulfide | CO Carbon Monoxide | CH4 Methane | HC Hydrocarbons | CO2 Carbon Dioxide | |
Part # | 65-2405RK | 65-2451RK | 65-2442RK-1000 | 65-2322RK | 65-2331RK | 65-2336RK | 65-2394RK-CH4 | 65-2394RK-HC | 65-2396RK-02 65-2396RK-03 65-2396RK-05 65-2396RK-10 |
65-2405RK-05 | 65-2451RK-05 | 65-2442RK-2000 | |||||||
Sensor | Catalytic | Metal oxide | Galvanic cell | Electrochemical | Infrared | ||||
Measuring Range | 0-100% LEL | 0-100% LEL (H2 Specific) | 0-1000 ppm | 0-25% Vol. | 0-100 ppm | 0-300 ppm | 0-100% LEL | 0 - 5000 ppm 0 - 5% Vol. 0 - 50% Vol. 0 - 100% Vol. | |
0-2000 ppm | |||||||||
Lower Detectable Limit (LDL) | 2% of full scale | 0.1% Vol. | 2% of full scale | ||||||
Accuracy | ± 5% of | ± 10% of | ± 0.5% O2 | ± 5% of | ± 5% of | ± 5% of | |||
Response Time (T-90) | 30 Seconds | 20 Seconds | 45 Seconds | 90 Seconds | 60 Seconds | 90 Seconds | 30 Seconds | ||
Max Current Draw (24VDC) | 70 mA (power wires) 25 mA (signal wires) 3 wires | 25 mA max, 2 wires | 60 mA (power wires) 25 mA (signal wires) 3 wires | ||||||
Life | 2 to 3 years with normal exposure to flammable gas | 3-5 years with normal service | 5 years plus with normal service | 2-3 years with normal service | 5 years plus with normal service | ||||
Operating Environment | |||||||||
Location | Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D. | ||||||||
Temperature | -40°F to 167°F -40°C to 75°C | -40°F to 167°F -40°C to 75°C | -4°F to 113°F -20°C to 45°C | -40°F to 104°F -40°C to 40°C | 23°F to 104°F -5°C to 40°C | -40°F to 122°F -40°C to 50°C | |||
Humidity | 0 – 99% RH, non condensing | ||||||||
Housing | |||||||||
Housing J Box | Cast aluminum explosion proof, optional stainless steel J-box available | ||||||||
Sensor | Stainless steel explosion proof | ||||||||
Controls | |||||||||
Zero | Sets transmitter output to 4 mA with zero output from sensor | ||||||||
Span | Sets transmitter output to proper level when span gas is applied | ||||||||
Output | 4 – 20 mA signal | ||||||||
Operating Voltage | 11 VDC to 30 VDC | 19 VDC to 30 VDC | 19-30VDC (250 OHMS impedance max) | 11 VDC to 30 VDC | |||||
Approvals | 65-2405RK UL | 65-2451RK UL | UL | CSA NRTL | C UL US | ||||
65-2405RK-05 | 65-2451RK-05 | ||||||||
Controllers | Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410A, and 800, also PLC and DCS systems | ||||||||
Warranty | One year materials and workmanship | ||||||||
Non Explosion Proof
O2 Oxygen | H2S Hydrogen Sulfide | CO Carbon Monoxide | Toxics See chart below | CO2 Carbon Dioxide | |
Part # | 65-2320RK | 65-2330RK | 65-2335RK | See chart | 65-2397RK-02 65-2397RK-03 65-2397RK-05 65-2397RK-10 |
Sensor | Galvanic cell | Electrochemical | Infrared | ||
Measuring Range | 0-25% Vol. | 0-100 ppm | 0-300 ppm | See chart | 0 - 5000 ppm 0 - 5% Vol. 0 - 50% Vol. 0 - 100% Vol. |
Lower Detectable Limit (LDL) | 0.1% Vol. | 2% of full scale | |||
Accuracy (whichever is greater) | ± 0.5% O2 | ± 5% of | ± 5% of | ± 10% of | ± 5% of |
Response Time (T-90) | 20 Seconds | 45 Seconds | 30 Seconds | 60 Seconds | 30 Seconds |
Max Current Draw (24VDC) | 25 mA max, 2 wires | 60 mA (power wires) 25 mA (signal wires) 3 wires | |||
Life Expectancy | 2 years normal | 2 to 3 years with normal service | 5 years plus with | ||
Operating Environment | |||||
Location | Indoor Class I, Div. 2 | ||||
Temperature | -4°F to 122°F -20°C to 50°C | 14°F to 104°F -10°C to 40°C | -40°F to 122°F -40°C to 50°C | ||
Humidity | 0 – 99% RH non condensing | 5-95% RH | 0 – 99% RH | ||
Housing | |||||
Housing J-Box | Cast aluminum, explosion-proof | ||||
Sensor | Plastic or aluminum | ||||
Controls | |||||
Zero | Sets transmitter output to 4 mA with zero output from sensor | ||||
Span | Sets transmitter output to 20 mA with full scale output from sensor | ||||
Operating Voltage | 19 VDC to 30 VDC | ||||
Output | 4-20 mA signal | ||||
Controllers | Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410A, and 800, also PLC and DCS systems | ||||
Warranty | One year materials and workmanship | ||||
|
| Non Explosion Proof Toxic Assemblies | ||||
Part Number With J-Box | Gas | Range | Resolution | Sensor Type | ||
65-2340RK-NH3 | Ammonia (NH3) | 0 - 75.0 ppm | 0.1 ppm | ESM -01 | ||
65-2340RK-AsH3 | Arsine (AsH3) | 0 - 1.50 ppm | 0.01 ppm | ESM -01 | ||
65-2341-CL2 | Chlorine (Cl2) | 0 - 3.00 ppm | 0.01 ppm | CT-7 | ||
65-2341-CL2-10 | Chlorine (Cl2) | 0 - 10.0 ppm | 0.1 ppm | CT-7 | ||
65-2341-CLO2 | Chlorine Dioxide (ClO2) | 0 - 1.00 ppm | 0.01 ppm | CT-7 | ||
65-2340RK-HCN | Hydrogen Cyanide (HCN) | 0 - 15.0 ppm | 0.1 ppm | ESM -01 | ||
65-2340RK-PH3 | Phosphine (PH3) | 0 - 1.00 ppm | 0.01 ppm | ESM -01 | ||
65-2340RK-SO2 | Sulfur Dioxide (SO2) | 0 - 6.00 ppm | 0.01 ppm | ESM -01 | ||
* Partial pressure sensor for helium (He) applications. Consult factory for details.
Direct Interface with Beacon 110 / 200 / 410 / 800 Controllers
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 | 3 | 2500 ft. | 5,000 ft. | 8,000 ft. | |
| Oxygen | 2 | 2500 ft. | 5,000 ft. | 8,000 ft. | |
| H2S | 2 | 2500 ft. | 5,000 ft. | 8,000 ft. | |
| CO | 2 | 2500 ft. | 5,000 ft. | 8,000 ft. | |
| Toxics | 2 | 2500 ft. | 5,000 ft. | 8,000 ft. | |
Specifications subject to change without notice.
Made in the USA