S2 Series – Gas Sensor/Transmitter

Diffusion Gas Sensor – Fixed Systems

Features

  • Available gases include
    – LEL, H2S, CO, PPM H2, and CO2
    – Toxic gases include NH3, AsH3, Cl2, ClO2, HCN, & SO2
  • 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
Contact RKI Sales

Description

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, Div 1 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, AsH3, Cl2, ClO2, HCN, PH3, and SO2.

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.

Related Services

Fixed Systems ServicesFixed Systems Turnkey Solutions

  • Design, Consultations, and Engineering
  • Installation
  • Start-up
  • Training
  • System Maintenance

 

Application

  • 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

Explosion Proof – Class I, Div. 1 , Groups B, C, D

  LEL
General Purpose
LEL
H2 Specific
H2 PPM
Hydrogen
O2
Oxygen
H2S
Hydrogen Sulfide
CO
Carbon Monoxide
CH4
Methane IR
HC
Hydrocarbons IR
CO2
Carbon Dioxide IR
Part #

65-2405RK

65-2451RK

65-2443-500

65-2443-1000

65-2443-2000

65-2322RK

65-2331RK

65-2336RK

65-2394RK-CH4

65-2394RK-HC

65-2396RK-02

65-2396RK-03

65-2396RK-05

65-2396RK-10

65-2405RK-05

65-2451RK-05

Sensor

Catalytic

Metal oxide
semiconductor

Galvanic cell

Electrochemical

Infrared

Measuring Range

0-100% LEL

0-100% LEL

(H2 Specific)

0-500 ppm

0-1000 ppm

0-2000 ppm

0-25% Vol.

0-100 ppm

0-300 ppm

0-100% LEL

0 – 5000 ppm

0 – 5% Vol.

0 – 50% Vol.

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

Max Current Draw (24VDC)

70 mA (power wires) 25 mA (signal wires) 3 wires

25 mA max, 2 wires

60 mA (power 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

-40°C to 75°C

-4°F to 104°F

-20°C to 40°C

-4°F to 113°F

-20°C to 45°C

-40°F to 104°F

-40°C to 40°C

23°F to 104°F

-5°C to 40°C

-40°F to 122°F

-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

19-30VDC (250 OHMS

impedance max)

11 VDC to 30 VDC

Approvals

65-2405RK

UL

65-2451RK

UL

65-2443-500
65-2443-1000
65-2443-2000

UL

CSA NRTL

C UL US

65-2405RK-05
CSA

65-2451RK-05
CSA

65-2443-500-05
65-2443-1000-05
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

Toxic Gas Transmitters – Class I, Div. 2

 

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)

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

-20°C to 50°C

14°F to 104°F

-10°C to 40°C

-40°F to 122°F

-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

 

S2 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-CL2-05 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
18 AWG wire 16 AWG wire 14 AWG wire
LEL / IR / CO2 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

Download

S2 Series Literature

Product Datasheet Operating Manuals
S2 Series Datasheet
S2 Series Product Datasheet
LEL S2 Series Manual
LEL S2 Series Manual
All others by part number

Distributor Resources

S2 Series Price List & Resources