S2 Series

Built to monitor common gasses in extreme, hazardous environments, the S2 Series is an all-in-one sensor series. Housed in a water repellent and explosion proof NEMA 4X enclosure, this durable sensor series integrates with other RKI controllers and sensors.

Gasses the S2 Series is capable of sensing include:

  • CO2
  • CO
  • SO2
  • NH3
  • HCN
  • H2S
  • Combustible gasses

General Specifications

LEL (General Purpose)LEL (H2 Specific)H2 PPM (Hydrogen)
Part Number65-2405RK / 65-2405RK-0565-2451RK / 65-2451RK-0565-2442RK-1000 / 65-2442RK-2000
SesorsCatalyticCatalyticMetal oxide semiconductor
Measuring Range0-100% LEL0-100% LEL (H2 Specific)0-1000 ppm / 0-2000 ppm
Lower Detectable Limit (LDL)2% of full scale2% of full scale2% of full scale
Accuracy (whichever is greater)± 5% of reading or ± 2% LEL± 5% of reading or ± 2% LEL± 10% of reading or ± 5% of full scale
Response Time (T-90)30 Seconds20 Seconds45 Seconds
Max Current Draw (24VDC)70 mA (power wires) 25 mA (signal wires) 3 wires70 mA (power wires) 25 mA (signal wires) 3 wires70 mA (power wires) 25 mA (signal wires) 3 wires
Life Expectancy2 to 3 years with normal exposure to flammable gas3-5 years with normal service5 years plus with normal service
General Specifications cont.
O2 OxygenH2S Hydrogen SulfideCO Carbon MonoxideCH4 MethaneHC HydrocarbonsCO2 Carbon Dioxide
Part Number65-2322RK65-2331RK65-2336RK65-2394RK-CH465-2394RK-HC65-2396RK-02 65-2396RK-03 65-2396RK-05 65-2396RK-10
SensorsGalvanic cellElectrochemicalElectrochemicalInfraredInfraredInfrared
Measuring Range0-25% Vol.0-100 ppm0-300 ppm0-100% LEL0-100% LEL0 - 5000 ppm 0 - 5% Vol. 0 - 50% Vol. 0 - 100% Vol.
Lower Detectable Limit (LDL)0.1% Vol.2% of full scale2% of full scale2% of full scale2% of full scale2% of full scale
Accuracy (whichever is greater)± 0.5% O2± 5% of reading ± 2 ppm H2S± 5% of reading ± 5 ppm CO± 5% of reading or ± 2% of full scale± 5% of reading or ± 2% of full scale± 5% of reading or ± 2% of full scale
Response Time (T-90)90 Seconds60 Seconds90 Seconds30 Seconds30 Seconds30 Seconds
Max Current Draw (24VDC)25 mA max, 2 wires25 mA max, 2 wires25 mA max, 2 wires60 mA (power wires) 25 mA (signal wires) 3 wires60 mA (power wires) 25 mA (signal wires) 3 wires60 mA (power wires) 25 mA (signal wires) 3 wires
Life Expectancy2-3 years with normal service2-3 years with normal service2-3 years with normal service5 years plus with normal service5 years plus with normal service5 years plus with normal service
Operating Environment
LEL General PurposeLEL H2 SpecificH2 PPM Hydrogen
LocationIndoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.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-40°F to 167°F -40°C to 75°C
Humidity0 - 99% RH, non condensing0 - 99% RH, non condensing0 - 99% RH, non condensing
Operating Environment cont.
O2 OxygenH2S Hydrogen SulfideCO Carbon MonoxideCH4 MethaneHC HydrocarbonsCO2 Carbon Dioxide
LocationIndoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.
Temperature4°F to 113°F -20°C to 45°C-40°F to 104°F -40°C to 40°C23°F to 104°F -5°C to 40°C-40°F to 122°F -40°C to 50°C-40°F to 122°F -40°C to 50°C-40°F to 122°F -40°C to 50°C
Humidity0 - 99% RH, non condensing0 - 99% RH, non condensing0 - 99% RH, non condensing0 - 99% RH, non condensing0 - 99% RH, non condensing0 - 99% RH, non condensing
Housing
Housing J BoxCast aluminum explosion proof, optional stainless steel J-box available
SensorStainless steel explosion proof
Controls
ZeroSets transmitter output to 4 mA with zero output from sensor
SpanSets transmitter output to proper level when span gas is applied
Output
Output4 - 20 mA signal
Voltage and Approvals
LEL General PurposeLEL H2 SpecificH2 PPM Hydrogen
Operating Voltage11 VDC to 30 VDC11 VDC to 30 VDC19 VDC to 30 VDC
Approvals65-2405RK UL / 65-2405RK-05 CSA65-2451RK UL / 65-2451RK-05 CSAUL
Voltage and Approvals Cont.
O2 OxygenH2S Hydrogen SulfideCO Carbon MonoxideCH4 MethaneHC HydrocarbonsCO2 Carbon Dioxide
Operating Voltage19-30VDC (250 OHMS impedance max)19-30VDC (250 OHMS impedance max)19-30VDC (250 OHMS impedance max)11 VDC to 30 VDC11 VDC to 30 VDC11 VDC to 30 VDC
ApprovalsCSA NRTLCSA NRTLCSA NRTLC UL USC UL USC UL US
Controllers and Warranty
ControllersCompatible with the following controllers: Beacon 110, Beacon 200, Beacon 410A, and 800, also PLC and DCS systems
WarrantyOne year materials and workmanship

Order Form