S-Series Detector Head

The RKI “S” series gas sensor/transmitters are highly reliable and very cost effective basic 4-20 mA transmitters for detection of common gas hazards. The “S” series transmitters are available for LEL, Oxygen, H2S, CO, or for 0 - 500 ppm Hydrocarbon detection (for various fuels or solvents). The electronics are encased inside a potted package to avoid damage from mechanical abuse or corrosion, and the amplifier is installed inside an explosion-proof enclosure. Sensors for LEL, H2S, CO, and ppm HC are explosion-proof with flame arrestors. The Oxygen sensor utilizes an internal I.S. barrier, so all 5 versions are designed for use in hazardous atmospheres.

The only tools required to calibrate the “S” 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 connection of a voltmeter for calibration purposes, and the sensor response is viewed on the voltmeter as a 100mV to 500mV signal. Field calibration can be performed easily and quickly by one person.

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

The transmitter operates from 24 VDC (10.5VDC to 30 VDC), and provides a 4-20mAsignal which can be connected to a wide variety of controllers.

Part #	LEL 65-2400RK	O2 65-2504RK	H2S 65-2422RK
Min Operating Voltage	11 VDC
Max Operating Voltage	30 VDC
Max Current Draw	200 mA (power wires) 25 mA (signal wires) 3 or 4 wires	25 mA (2 wire system)
Signal Output	4 mA at 0% LEL 20 mA at 100% LEL	4 mA at 0 % Oxygen 20 mA at 25% Oxygen	4 mA at 0 ppm H2S 20 mA at 100 ppm H 2 S
Response Time	30 seconds to 90% of concentration	20 seconds to 90% of concentration	45 seconds to 90% of concentration
Operating Environment
Location	Indoor or outdoor. Explosion proof for Class , Div. 1, Groups B, C, and D.	Indoor or outdoor. Explosion proof housing and intrinsically safe sensor.	Indoor or outdoor. Explosion proof for Class , Div. 1, Groups B, C, and D.
Temperature	-40 to 185° F	30 to 120° F	0 to 120° F
Humidity	0 - 99% RH, non condensing
Housing	Aluminum Explosion proof enclosure
Sensor
Type	Catalytic Combustion	Galvanic Cell	Electrochemical
Life Expectancy	1 to 2 years normal service when intermittently exposed to flammable gas in air mixtures	2 years normal service	2 years normal service when intermittently exposed to H2S
Controls
Sensor Current	Factory set and sealed	-
Zero	Sets transmitter output to 4 mA with 0%LEL output from combustible sensor	Sets transmitter output to 4 mA with an inert gas (zero) output from O 2 sensor	Sets transmitter output to 4 mA with zero output from H2S sensor
Span	Sets transmitter out- put to 20 mA with 100% LEL output from combustible sensor	Sets transmitter output to 17.44 mA with 21% VOL O 2 (fresh air) output from O 2 sensor	Sets transmitter output to 20 mA with 100 ppm output from H2S sensor
Tools Needed	Screwdriver and voltmeter used to make adjustments

Part #	CO 65-2432RK	HC 65-2460RK
Min Operating Voltage	11 VDC
Max Operating Voltage	30 VDC
Max Current Draw	25 mA (2 wire system)	100 mA (power wires) 25 mA (signal wires) 3 wires
Signal Output	4 mA at 0 ppm CO 20 mA at 500 ppm CO	4 mA at 0 ppm 20 mA at 500 ppm Hexane. Linear.
Response Time	30 seconds to 90% of concentration
Operating Environment
Location	Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.	Explosion proof for Class , Div. 1, Groups B, C, and D.
Temperature	0 to 120° F	30 to 120° F
Humidity	0 - 99% RH, non condensing	5 - 95% RH, non condensing
Housing	Aluminum Explosion proof enclosure
Sensor
Type	Electrochemical	Metal Oxide Semiconductor
Life Expectancy	2 to 3 years normal service	5 to 10 years typical
Controls
Sensor Current	-	Factory set and sealed
Zero	Sets transmitter output to 4 mA with zero output from CO sensor	Sets transmitter output to 4 mA with zero ppm output from sensor
Span	Sets transmitter output to 20 mA with 500 ppm output from CO sensor	Sets transmitter output to 20 mA with 500 ppm Hexane (typical) output from sensor
Tools Needed	Screwdriver and voltmeter used to make adjustments

Part #	CO2 65-2391RK-03	CH4 65-2390RK-CH4	HC 65-2390RK-HC
Measuring Range	0-5% Vol.	0-100% LEL
Max Current Draw	60 mA (power wires) 25 mA (signal wires) 3 wires
Signal Output	4 - 20 mA signal
Response Time	30 seconds to 90% of concentration
Operating Environment
Location	Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.
Temperature	-4 to 122° F
Humidity	0 - 99% RH, non condensing
Housing	Aluminum Explosion proof enclosure
Sensor
Type	Infrared
Life Expectancy	5+ years normal service
Controls
Sensor Current	-	Factory set and sealed
Zero	Sets transmitter output to 4 mA with zero output from CO2 sensor	Sets transmitter output to 4 mA with 0% LEL output from combustible sensor
Span	Sets transmitter output to 20 mA with 5% volume output from CO2 sensor	Sets transmitter output to 20 mA with 100% LEL output from combustible sensor
Operating Voltage	11 VDC to 30 VDC
Approvals	C CSA US
Warranty	One year materials and workmanship