Diffusion Sensor/Transmitter

Datasheet • CO Manual • H2S Manual • LEL Manual • O2 Manual

S-Series sensor transmitter The RKI S-Series gas sensor/transmitters are highly reliable and cost effective basic 4-20 mA transmitters for the detection of common gas hazards. The S-Series transmitters are available for LEL (catalytic), LEL (IR) CH4, LEL (IR) HC, O2, H2S, CO, or CO2 (IR). 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. There is also an optional version for oxygen for use in non-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 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 S-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 (11VDC to 30 VDC), and provides a 4-20mA signal which can be connected to a wide variety of controllers.

Features

Explosion proof housing
Patented water repellent sensor coating
Available for LEL, H2S, CO, O2 , and ppm HC
IR sensors available for LEL & CO2
Long life sensors (2 + years typical)
Competitively priced
UL or CSA classified (most versions)

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

Specifications (IR versions below)

Part #	LEL 65-2400RK 65-2400RK-05	O₂ 65-2513RK 65-2516RK 65-2504RK*	H₂S 65-2422RK-05	CO 65-2432RK-05 (65-2435RK) (H2 Compensated)
Measuring Range	0-100% LEL	0-25% Vol.	0-100 ppm	0-300 ppm
Max Current Draw	200 mA (power wires) 25 mA (signal wires) 3 or 4 wires	25 mA (2 wire system)
Signal Output	4 - 20 mA signal
Response Time	30 seconds to 90% of concentration	20 seconds to 90% of concentration	45 seconds to 90% of concentration	35 seconds
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 I, Div. 1, Groups B, C, and D.
Temperature	-40 to 185° F	-4 to 113° F
Humidity	0 - 99% RH, non condensing			0 - 99% RH, (15 - 90% RH) non condensing
Housing	Aluminum Explosion proof enclosure
Sensor
Type	Catalytic Combustion	Galvanic Cell	Electrochemical
Life Expectancy	1 to 2 years with normal intermmittent exposure to flammable gas	2 years normal service	2 years normal service when intermittently exposed to H₂S	2 to 3 years normal service
Controls
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 O2 sensor	Sets transmitter output to 4 mA with zero output from H2S sensor	Sets transmitter output to 4 mA with zero output from CO sensor
Span	Sets transmitter output to 20 mA with 100% LEL output from combustible sensor	Sets transmitter output to 17.44 mA with 20.9% Vol. O2 (fresh air) output from O2 sensor	Sets transmitter output to 20 mA with 100 ppm output from H2S sensor	Sets transmitter output to 20 mA with 300 ppm output from CO sensor
Operating Voltage	11 VDC to 30 VDC
Approvals	65-2400RK UL 65-2400RK-05 C/CSA/US	65-2516RK C/CSA/US	C/CSA/US
Warranty	One year materials and workmanship

Infrared
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
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/UL/US
Warranty	One year materials and workmanship

* Specifications subject to change without notice.
Made in the USA

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Diffusion Sensor/Transmitter

Infrared