RKI Instruments S2 series diffusion gas sensor/transmitters for fixed systems: highly reliable, very cost-effective detection of common gas hazards, with 4-20 mA output.
Gas options: Methane (CH4), LEL - H2 Specific, Hydrogen Sulfide (H2S), Hydrocarbons (HC), H2 (0-1000 ppm), H2 (0-2000 ppm), LEL, Oxygen (O2), Carbon Monoxide (CO), CO2 (0-100% Vol.), CO2 (0-5.0% Vol.), CO2 (0-50% Vol.), CO2 (0-5000 ppm).
Key benefits
- Available for LEL, H2-specific (LEL and ppm), oxygen, H2S, CO, CO2 and a variety of toxic gases; LEL by catalytic bead or infrared
- LEL, H2-specific, oxygen, H2S, CO2 and CO transmitters are explosion-proof with flame arrestors, approved for Class I, Div. 1, Groups B, C, D; optional non-explosion-proof version for oxygen, H2S, CO and CO2 (Class 1, Div. 2)
- Toxic sensors (NH3, AsH3, Cl2, ClO2, HCN, PH3, SO2) are electrochemical plug-in types with high specificity, fast response and long life; tool-free field replacement; for Class I, Div. 2
- Indoor or outdoor use; patented water-repellent flame arrestor coating; splash guards for very wet environments
- Optional stainless steel junction box for corrosive environments
- Interfaces with RKI controllers or PLC/DCS systems
- Made in the USA
Specifications
| LEL General Purpose |
LEL H2 Specific |
H2 PPM Hydrogen |
O2 Oxygen |
H2S Hydrogen Sulfide |
CO Carbon Monoxide |
CH4 Methane IR |
HC Hydrocarbons IR |
CO2 Carbon Dioxide IR |
|
| Part # | 65-2405RK | 65-2451RK | 65-2443-500 65-2443-1000 65-2443-2000 | 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 | ||||||||
| Sensor | Catalytic | Metal oxide semiconductor |
Galvanic cell | Electrochemical | Infrared | ||||
| Measuring Range | 0-100% LEL | 0-100% LEL (H2 Specific) | 0-500 ppm 0-1000 ppm 0-2000 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. | |
| Lower Detectable Limit (LDL) | 2% of full scale | 0.1% Vol. | 2% of full scale | ||||||
| Accuracy (whichever is greater) |
± 5% of reading or ± 2% LEL |
± 10% of full scale | ±0.5% O2 | ± 5% of reading ± 2 ppm H2S |
± 5% of reading ± 5 ppm CO |
± 5% of reading or ± 2% of full scale |
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| 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 Expectancy |
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 | -4°F to 104°F -20°C to 40°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 | 65-2443-500 65-2443-1000 65-2443-2000 UL |
CSA NRTL | C UL US | ||||
| 65-2405RK-05 CSA |
65-2451RK-05 CSA |
65-2443-500-05 65-2443-1000-05 65-2443-2000-05 CSA |
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| 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 | ||||||||
| O2 Oxygen |
H2S Hydrogen Sulfide |
CO Carbon Monoxide |
Toxics See chart below |
CO2 Carbon Dioxide |
|
| Part # | 65-2320RK | 65-2330RK | 65-2335RK | See chart below |
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 below |
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 reading ± 2 ppm H2S |
± 5% of reading ± 5 ppm CO |
± 10% of reading or ± 5% of full scale |
± 5% of reading or ± 2% of full scale |
| 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 service |
2 to 3 years with normal service | 5 years plus with normal service |
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| 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 non condensing |
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| 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 | ||||
S2 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 |
| 65-2341-NH3-75 | Ammonia (NH3) | 0 – 75.0 ppm | 0.1 ppm | CT-7 |
| 65-2341-NH3-1 | Ammonia (NH3) | 0 – 100 ppm | 1 ppm | CT-7 |
| 65-2341-NH3-2 | Ammonia (NH3) | 0 – 200 ppm | 1 ppm | CT-7 |
| 65-2341-NH3-5 | Ammonia (NH3) | 0 – 500 ppm | 1 ppm | CT-7 |
| 65-2340RK-AsH3 | Arsine (AsH3) | 0 – 1.50 ppm | 0.01 ppm | ESM -01 |
| 65-2341-CL2-3 | Chlorine (Cl2) | 0 – 3.00 ppm | 0.01 ppm | CT-7 |
| 65-2341-CL2-05 | Chlorine (Cl2) | 0 – 5.00 ppm | 0.02 ppm | CT-7 |
| 65-2341-CL2-10 | Chlorine (Cl2) | 0 – 10.0 ppm | 0.1 ppm | CT-7 |
| 65-2341-CLO2-1 | 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 |
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.
Product information supplied by the manufacturer (RKI Instruments).
Product codes
- Methane (CH4) — SKU: 65-2394RK-CH4
- LEL - H2 Specific — SKU: 65-2451RK
- Hydrogen Sulfide (H2S) — SKU: 65-2331RK
- Hydrocarbons (HC) — SKU: 65-2394RK-HC
- H2 (0-1000 ppm) — SKU: 65-2442RK-1000
- H2 (0-2000 ppm) — SKU: 65-2442RK-2000
- LEL — SKU: 65-2405RK
- Oxygen (O2) — SKU: 65-2322RK
- Carbon Monoxide (CO) — SKU: 65-2336RK
- CO2 (0-100% Vol.) — SKU: 65-2396RK-10
- CO2 (0-5.0% Vol.) — SKU: 65-2396RK-03
- CO2 (0-50% Vol.) — SKU: 65-2396RK-05
- CO2 (0-5000 ppm) — SKU: 65-2396RK-02