S2

S2 Series

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 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, 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

	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	65-2443-500	65-2322RK	65-2331RK	65-2336RK	65-2394RK-CH4	65-2394RK-HC	65-2396RK-02
	65-2405RK-05	65-2451RK-05	65-2443-1000						65-2396RK-03
			65-2443-2000						65-2396RK-05
			65-2443-2000						65-2396RK-10
Sensor	Catalytic		Metal oxide semiconductor	Galvanic cell	Electrochemical		Infrared
Measuring Range	0-100% LEL	0-100% LEL (H2 Specific)	0-500 ppm	0-25% Vol.	0-100 ppm	0-300 ppm	0-100% LEL		0 - 5000 ppm
			0-1000 ppm						0 - 5% Vol.
			0-2000 ppm						0 - 50% Vol.
			0-2000 ppm						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
Response Time (T-90)	30 Seconds	20 Seconds	45 Seconds	90 Seconds	60 Seconds	90 Seconds	30 Seconds	30 Seconds	30 Seconds
Max Current Draw (24VDC)	70 mA (power wires)			25 mA max, 2 wires			60 mA (power wires)
Max Current Draw (24VDC)	25 mA (signal wires) 3 wires			25 mA max, 2 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		-4°F to 104°F	-4°F to 113°F	-40°F to 104°F	23°F to 104°F	-40°F to 122°F
Temperature	-40°C to 75°C		-20°C to -40°C	-20°C to 45°C	-40°C to 40°C	-5°C to 40°C	-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	19-30 VDC (250 OHMS impedance max)			11 VDC to 30 VDC
Approvals	65-2405RK: UL	65-2451RK: UL	65-2443-500: UL	CSA NRTL			C UL US
	65-2405RK-05: CSA	65-2451RK-05: CSA	65-2443-1000: UL
			65-2443-2000: UL
			65-2443-500-05: CSA
			65-2443-1000-05: CSA
			65-2443-2000-05: CSA
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)
Max Current Draw (24VDC)	25 mA max, 2 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
Operating Environment
Location	Indoor Class I, Div. 2
Temperature	-4°F to 122°F			14°F to 104°F	-40°F to 122°F
Temperature	-20°C to 50°C			-10°C to 40°C	-40°C to 50°C
Humidity	0 - 99% RH non condensing			5-95% RH	0 - 99% RH non condensing
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
65-2341-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-CL2-5	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
S2 Transmitter	Number of Wires to Controller	18 AWG wire	16 AWG wire	14 AWG wire
LEL / IR / CO2	3	2500 ft.	5000 ft.	8000 ft.
Oxygen	2	2500 ft.	5000 ft.	8000 ft.
H2S	2	2500 ft.	5000 ft.	8000 ft.
CO	2	2500 ft.	5000 ft.	8000 ft.
Toxics	2	2500 ft.	5000 ft.	8000 ft.

Cal cup for ESM-01 diffusion ammonia sensors, fixed systems

Cal cup for ESM-01 diffusion chlorine sensors, fixed systems

Cal cup for ESM-01 diffusion sensors, fixed systems (not for Cl2 or NH3)

Cal cup/splash guard assembly, for CT7 sensor housing

Calibration cup / splash guard, for IR 3/4” NPT sensor, with diffuser holes

Calibration kit tubing, polyurethane, 3/16” ID x 5/16” OD, 3 feet

Cylinder, Cl2 2 ppm in N2, 34AL

Cylinder, Cl2 2 ppm in N2, 58AL

Cylinder, Cl2 5 ppm in N2, 34AL

Cylinder, Cl2 5 ppm in N2, 58AL

Cylinder, CO2 5000 ppm in N2, 103L steel

Cylinder, CO2 5000 ppm in N2, 34L steel

Cylinder, CO2, 15% in N2, 34L

Cylinder, CO2, 2.5% in N2, 34L

Cylinder, CO2, 2000 ppm in N2, 34L

Cylinder, H2 250 ppm in air, 103L

Cylinder, H2 250 ppm in air, 34L steel

Cylinder, H2 4% vol in N2, 34L steel

Cylinder, H2 500 ppm in air, 34L steel

Cylinder, H2, 1000 ppm in air, 103L steel

Cylinder, H2, 1000 ppm in air, 34L steel

Cylinder, H2, 2000 ppm in air, 103L steel

Cylinder, H2, 2000 ppm in air, 34L steel

Cylinder, H2, 500 ppm in air, 103L steel

Cylinder, HCN 10 ppm in N2, 34AL

Cylinder, HCN 10 ppm in N2, 58AL

Cylinder, NH3 100 ppm in N2, 58AL

Cylinder, NH3 25 ppm in N2, 34AL

Cylinder, NH3 25 ppm in N2, 58AL

Cylinder, PH3 0.5 ppm in N2, 34AL

Cylinder, PH3 0.5 ppm in N2, 58AL

Cylinder, SO2 5 ppm in N2, 34AL

Cylinder, SO2 5 ppm in N2, 58AL

Cylinder, Zero air, 103L steel

Cylinder, Zero air, 17L steel

Gasket, CT-7 Sensor Housing, Non-XP

Gasket, ESM-01 Sensor Housing

Humidifier, 6” tube assembly for cal kits with 3/16” tubing on ends

Junction box, with spacers (Aluminum)

Regulator, with gauge and knob, 34AL/58AL/103L steel, 0.25 LPM

Transmitter, S2, LEL, 4-20 mA, standard version, 4 wire (low current) detector

Transmitter, S2, Oxygen, 0-25%, 4-20 mA, with gasket

Transmitter, S2, potted, 4-20 mA, 0-100% Oxy, with gasket