RKI Instruments S2 Specifications

FO26-1710/1000

S2 SENSOR / TRANSMITTER

— Available gases include

NH3 Sensor

Explosion Proof

LEL

Explosion Proof

O2 / CO / H2S

◦ 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

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, H
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 non-hazardous atmospheres. 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.

World Leader In Gas Detection & Sensor Technology

RKI Instruments, Inc. | 33248 Central Ave. Union City, CA 94587 | Phone [phone] | [phone] | Fax [phone]

Specific (LEL, and ppm), Oxygen, H2S, CO, and for a variety of toxic

2

www.rkiinstruments.com

Explosion Proof

LEL

General
Purpose

Part #

65-2405RK 65-2451RK 65-2442RK-1000

65-2405RK-05 65-2451RK-05 65-2442RK-2000

Sensor

Measuring Range 0-100% LEL

Lower Detectable

Limit (LDL)

Accuracy

(whichever is

greater)

Response Time

Max Current Draw

(24VDC)

Expectancy

30 Seconds 20 Seconds 45 Seconds 90 Seconds 60 Seconds 90 Seconds 30 Seconds

(T-90)

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

2 to 3 years
with normal

Life

exposure to

flammable gas

Operating Environment

H2 Specific

Catalytic

0-100% LEL

(H2 Specific)

2% of full scale

± 5% of
reading or
± 2% LEL

3-5 years with

normal service

LEL

H2 PPM

Hydrogen

Metal oxide

semiconductor

0-1000 ppm

0-2000 ppm

± 10% of

reading or

± 5% of full scale

5 years plus with

normal service

O2

Oxygen

65-2322RK 65-2331RK 65-2336RK 65-2394RK-CH4 65-2394RK-HC

Galvanic cell Electrochemical Infrared

0-25% Vol. 0-100 ppm 0-300 ppm 0-100% LEL

0.1% Vol. 2% of full scale

± 0.5% O2

2-3 years with normal service 5 years plus with normal service

H2S

Hydrogen

Sulfide

± 5% of
reading

± 2 ppm H2S

25 mA max, 2 wires

CO

Carbon

Monoxide

± 5% of
reading

± 5 ppm CO

CH4

MethaneHCHydrocarbons

± 5% of

reading or

± 2% of full scale

60 mA (power wires)

25 mA (signal wires) 3 wires

CO2

Carbon
Dioxide

65-2396RK-02
65-2396RK-03
65-2396RK-05
65-2396RK-10

0 - 5000 ppm
0 - 5% Vol.
0 - 50% Vol.
0 - 100% Vol.

Location

Temperature

Humidity 0 - 99% RH, non condensing

-40°F to 167°F

-40°C to 75°C

Indoor or outdoor. Explosion proof for Class I, Div. 1, Groups B, C, and D.

-40°F to 167°F

-40°C to 75°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

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

Operating

Voltage

Approvals

Controllers

11 VDC to 30 VDC

65-2405RKUL65-2451RK

65-2405RK-05

CSA

UL

65-2451RK-05

CSA

Compatible with the following controllers: Beacon 110, Beacon 200, Beacon 410A, and 800, also PLC and DCS systems

19 VDC to 30 VDC

UL CSA NRTL

4 - 20 mA signal

19-30VDC (250 OHMS

impedance max) 11 VDC to 30 VDC

-40°F to 122°F

-40°C to 50°C

UL

C

US

Warranty

www.rkiinstruments.com

One year materials and workmanship

S2 Sensor / Transmitter S2 Sensor / Transmitter[phone]