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Transmitters

S2 Series

The RKI S2 series gas sensor transmitters are highly reliable and cost effective basic 4-20 mA transmitters for the detection of common gas hazards. The S2 series transmitters are available for LEL (catalytic), LEL (IR) CH4, LEL (IR) HC, C02 (IR), ppm H2 (MOS) and ppm Hydrocarbons (MOS). The electronics are encased inside a potted package to avoid damage from mechanical abuse or corrosion, and this assembly is installed inside an explosion-proof enclosure. All sensors are explosion-proof with flame arrestors and approved for use in hazardous atmospheres.

The only tools required to calibrate the S2 series are a voltmeter, screwdriver, and cal gas. The zero and calibration functions are performed by adjusting potentiometers on the amplifiers. The amplifier has test jacks for connecting to a voltmeter for calibration purposes, and the sensor response is viewed on the voltmeter as a 100 mV to 500 mV signal. Field calibration can be performed easily and quickly by one person.

The S2 series transmitters can be used either indoors or outdoors. The flame arrestors utilize a patented coating which make them water repellent, and splash guards are also available for use in very wet environments.

The transmitter operates from 24 VDC, and provides a 4-20mA signal which can be connected to a wide variety of controllers.

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Features
Applications
Specification
Accessories

Explosion Proof Housing
Patented Water repellent Sensor Coating
Available for LEL, H2, H2S, CO, O2, ppm HC, and CO2
IR Sensors available for LEL & CO2

H2 Specific LEL and ppm versions available
Long Life Sensors (2 + years typical)
Competitively Priced
UL or CSA Approved

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
Battery Charging (H2)

Model	LEL (General Purpose)	LEL H2 Specific	O₂	H₂S	CO	MOS		Infrared
Part #	65-2405RK 65-2405RK-05	65-2451RK 65-2451 RK-05 6.5-2452FlK 65-2452RK-05	65-2322RK 65-232ORK- 100	65-2428RK-05	65-2438RK-Q5	65-2442R K-1000 65-2442F3K-2000	65-2461 RK-500	65-2391 RK-03	65-2390RK-CH4	65-2390RK-HC
Measuring Range	0-100% LEL	0-100% LEL (H2 Specific)	0-25% Vol 0-100% Vol	0-100 ppm	0-300 ppm	0-1000 ppm / 0-2000 ppm	0-500 ppm HEX	0-5% Vol.	0-100% LEL
Max Current Draw (24VDC	200 mA (power wires) 25 mA (signal wires) 3 wires		20 mA max, 2 wires			200 mA (power wires) 25 mA (signal wires) 3 wires		60 mA (power wires) 25 mA (signal wires) 3 wires
Outputs	4 - 20 mA signal
Response Time (T-90)	30 seconds	20 seconds	20 seconds	45 seconds	30 seconds	45 seconds to 90%		30 seconds to 90%
Operating Environment
Location	Indoor/outdoor. Explosion proof for Class I, Div 1, Groups B, C, and D.	Indoor/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 10 185^° F	-4 to 122^° F						4 to 122^° F
Humidity	o - 99% RH, non condensing
Housing	Aluminum explosion proof enclosure
Sensors
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			5 years normal service
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)		19 VDC to 30 VDC		11 VDC to 30 VDC
Approvals	65-2451 RK UL 65-2451 RK UL C CSA us	65-2451 RK UL 65-2452RK UL 65-2451 RK-05 65-2452RK-05 C ^CSA us	C ^CSA us	C CSA us		UL		C UL US
Warranty	One year materials and workmanship