Diffusion Sensor/Transmitter

Datasheet • LEL Manual • H2 Specific Manual

The RKI S2 series gas sensor/transmitter is highly reliable and very cost effective for the detection of common gas hazards. The S2 series are available for LEL, H2 Specific LEL, Oxygen, H2S, CO, and for a variety of toxic gases. The transmitters for LEL, 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.

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 a Class I, Div. 2 explosion proof area. Sensors available for NH3, SO2, PH3, AsH3, and HCN.

The S2 transmitter can be used either indoors or outdoors. The flame arrestors for the explosion-proof versions utilize a patented coating which make them water repellent. Also, splash guards are available for use in very wet environments.

All of the S2 transmitters are designed to interface with RKI controllers, or with PLC/DCS systems.

Features

Available for LEL, H2, O2, CO, H2S, and CO2
(Class I Div 1 groups B, C, D)
Available Toxic gases include NH3, SO2, HCN, and more
Long life sensors (2 + years typical)
Water repellent patented sensor coating
(except toxics)
Explosion proof construction for toxic sensors (Class I, Div. 1 for enclosure, Class I, Div. 2 for sensor)
Linear 4-20 mA output
Loop-powered (24VDC) for toxics (except CO2) and O2

Applications

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
Non-Explosion Proof Specifications

H2 MOS and Infrared CO2 CH4 HC versions are also available

	LEL (General Purpose)	LEL H2 Specific	O2	H2S	CO
Part #	65-2405RK 65-2405RK-05	65-2451RK 65-2451RK-05 65-2452RK 65-2452RK-05	65-2322RK	65-2428RK-05	65-2438RK-05
Measuring Range	0-100% LEL	0-100% LEL (H2 Specific)	0-25% Vol.	0-100 ppm	0-300 ppm
Max Current Draw (24VDC)	200 mA (power wires) 25 mA (signal wires) 3 wires		20 mA max, 2 wires
Output	4 - 20 mA signal
Response Time (T-90)	30 Seconds	20 Seconds	20 Seconds	45 Seconds	30 Seconds
Operating Environment
Location	Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.
Temperature	-40 to 185° F	-4 to 122° F
Humidity	0 - 99% RH, non condensing
Housing
Housing J Box	Cast aluminum explosion proof
Sensor	Staginess steel explosion proof
Sensor
Life Expectancy	1 to 2 years with normal sensor exposure to flammable gas. 3-5 Years for H2 exposure		2-3 years with normal service
Type	Catalytic		Electrochemical
Controllers	Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410, and 800, also PLC and DCS systems
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	11 VDC to 30 VDC			19-30VDC (250 OHMS impedance max)
Approvals	65-2451RK UL 65-2451RK-05 C CSA US	65-2451RK UL 65-2452RK UL 65-2451RK-05 65-2452RK-05 C CSA US	C CSA US	C CSA US
Warranty	One year materials and workmanship

	MOS	Infrared
	H2	CO2	CH4	HC
Part #	65-2442RK-1000 65-2442RK-2000	65-2391RK-02 65-2391RK-03 65-2391RK-05 65-2391RK-10	65-2396RK-CH4	65-2390RK-HC
Measuring Range	0-1000 ppm/ 0-2000 ppm	0-5000 ppm 0-5% Vol. 0-50% Vol. 0-100% Vol.	0-100% LEL
Max Current Draw (24VDC)	200 mA (power wires) 25 mA (signal wires) 3 wires	60 mA (power wires) 25 mA (signal wires) 3 wires
Output	4 - 20 mA signal
Response Time (T-90)	45 Seconds to 90%	30 Seconds to 90%
Operating Environment
Location	Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.
Temperature	-4 to 122° F	-4 to 122° F
Humidity	0 - 99% RH, non condensing
Housing
Housing J Box	Cast aluminum explosion proof
Sensor	Staginess steel explosion proof
Sensor
Life Expectancy	5 years plus normal service
Type	MOS	Infrared
Controllers	Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410, and 800, also PLC and DCS systems
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	11 VDC to 30 VDC
Approvals	UL	C UL US
Warranty	One year materials and workmanship

	O2	H2S	CO	CO2	Toxics
Sensor With J-Box	65-2321RK	65-2330RK	65-2335RK	65-2397RK-02 65-2397RK-03 65-2397RK-05 65-2397RK-10	See chart below
Measuring Range	0-3 ppm	0-75 ppm	0-6 ppm	0-5000 ppm 0-5% Vol. 0-50% Vol. 0-100% Vol.
Output	4-20mA signal
Response Time (T-90)	20 Seconds	45 Seconds	30 Seconds		60 Seconds
Operating Environment
Location	Indoor Class I, Div. 2
Temperature	-4 ~ 122° F				14°~104°F
Humidity	0 - 99% RH non condensing				5-95% RH
Housing
Housing J-Box	Cast aluminum, explosion-proof
Sensor	Plastic or aluminum
Sensor
Life Expectancy	2 Years normal service	2 to 3 years with normal intermittent exposure to flammable gas.
Type	Electrochemical
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
Controllers	Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410, and 800, also PLC and DCS systems
Warranty	One year materials and workmanship

Non Explosion Proof Toxic Assemblies
Ordering Information
Part Number	Gas	Range
65-2340RK-ASH3	Arsine (AsH3)	0 - 1.5 ppm
65-2340RK-NH3	Ammonia (NH3)	0 - 75 ppm
65-2340RK-Cl2	Chlorine (Cl2)	0 - 3.00 ppm
65-2340RK-PH3	Phosphine (PH3)	0 - 1.00 ppm
65-2340RK-SO2	Sulfur Dioxide (SO2)	0 - 6.00 ppm

Direct Interface with Beacon 110 / 200 / 410 / 800 Controllers

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	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