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Beacon 200 2-Channel ControllerBeacon 200 2-Channel Controller 332613 Beacon 401A 4-Channel Controller with Strobe LightBeacon 401A 4-Channel Controller with Strobe Light 332616
Explosion-Proof Direct-Connect Sensor 332618Explosion-Proof Direct-Connect Sensor 332618
Alarms: audible (94 dB) and visual (4 LEDs per channel)
Controller inputs: direct-wired sensors; 4-20 mA (24 VDC, 2 or 3 wire)
Controller relay outputs: 2-channel models: 7 relays and 4-20 mA (max 1000 Ω impedance per channel); 4-channel models: 2 programmable Form-C relays per channel, 5 common relays, 4-20 mA signal (max 500 Ω impedance per channel), and Modbus RS-485
Display: backlit alphanumeric LCD
Power: 115/220 VAC or 24 VDC
Enclosure: NEMA 4X
Operating conditions: -4 to 122°F
Dimensions (W x D x H): 2-channel models: 8.5" x 6.3" x 10.5"**; 4-channel models: 11.5" x 6.4" x 12.5"**
Weight: 2-channel models: 10 lbs; 4-channel models: 14 lbs
Sensor compliance: Class I, Div. 1, Groups B-D (explosion-proof models); Class I, Div. 2, Groups B-D, no certification (non-explosion-proof models)
**For models with attached strobe light, add 1" to height.
RKI Beacon™ Fixed Gas Detection Systems
Accepts any 4-20 mA transmitter input (24 VDC)
Choose from 2- or 4-channel controllers
The RKI Beacon system lets you configure the ideal fixed gas detection setup for your application—simply combine a controller with your choice of sensors and transmitters. Easy to install and operate, microprocessor-based Beacon controllers monitor gases using any combination of direct-connect sensors or sensor/transmitters (sold separately below). Unsure of the best options for your application? Contact our Technical Support specialists for help in assembling your system.
Unsure of the best options for your application? Contact our Technical Support specialists for help in assembling your system.
Controllers
Controllers feature built-in audible and visual alarms, as well as a 4-20 mA output. An exterior reset switch lets you silence the integral alarm without opening the housing. Choose from 2-channel Beacon 200 models or more robust 4-channel Beacon 410A models. Both are available with or without a high-visibility strobe light.
Beacon 200 Fixed-Gas Controllers
The Beacon 200 controller is a powerful, low-cost fixed-system controller for two points of gas detection. It features 10-amp relays, which are strong enough to actuate most external alarms and horns without using subordinate relays. The backlit digital display shows gas type and concentration simultaneously. A wall mounting kit (included) makes installation easy.
DESCRIPTION STOCK #
Beacon 200 2-Channel Controller 332613
Beacon 200 2-Channel Controller with Strobe Light 332614
Standby Battery Assembly, 24 VDC 332617
Beacon 410A Fixed-Gas Controllers
The Beacon 410A controller monitors four channels at once. Each channel features three alarm points and two dedicated relays—all fully configurable—as well as a bank of common relays. Easy-to-use menus on the OLED display allow for easy setup. When in use, the display simultaneously shows gas type, readings and status for all four channels. A min-max feature retains high and low peak readings for review at any time, while a digital Modbus interface facilitates remote datalogging. Alarms and Form-C relay contacts are built in, so there’s no need to purchase or maintain add-on cards or components.
DESCRIPTION STOCK #
Beacon 401A 4-Channel Controller 332615
Beacon 401A 4-Channel Controller with Strobe Light 332616
Standby Battery Assembly, 24 VDC 332617
Sensors
Use these sensors with Beacon controllers both indoors and out. All sensors include a cast-aluminum junction box. Note: Most sensors require the use of a calibration cup (sold separately below).
Direct-Connect Sensors
Direct-connect sensors are an economical option when the sensor will be located near the controller. Direct-connect LEL combustibles and IR methane sensors are available as low-mount (floor to six feet) or high-mount (approximately 10 feet to ceiling) models. High-mount sensors include a calibration adapter that eliminates the need for a ladder.
DESCRIPTION RANGE SENSORS
STOCK #
CALIBRATION
CUPS

STOCK #
DIRECT-CONNECT SENSORS, STANDARD
Oxygen (O₂) 0 to 25% 332623 332642
Carbon Monoxide (CO) 0 to 300 ppm 332625 332642
Hydrogen Sulfide (H₂S) 0 to 100 ppm 332624 332642
Ammonia (NH₃) 0 to 75 ppm 332622 332642
Chlorine (Cl₂) 0 to 10 ppm 332626 332642
DIRECT-CONNECT SENSORS, EXPLOSION-PROOF*
LEL Combustibles, Low-Mount 0 to 100% 332618 332642
LEL Combustibles, High-Mount 0 to 100% 332619
IR Methane (CH₄), Low-Mount 0 to 100% 332620 332643
IR Methane (CH₄), High-Mount 0 to 100% 332621
S2 Sensor/Transmitters
S2 sensor/transmitters are ideal when the sensor needs to be mounted farther away from the controller. Less wiring simplifies installation. You calibrate them directly at the sensor head. S2 sensor/transmitters can also interface directly with PLC/DCS system controllers.
DESCRIPTION RANGE SENSORS
STOCK #
CALIBRATION
CUPS

STOCK #
S2 SENSOR/TRANSMITTERS, STANDARD
Ammonia (NH₃) 0 to 75 ppm 332631 332642
Chlorine (Cl₂) 0 to 10 ppm 332630 332642
S2 SENSOR/TRANSMITTERS, EXPLOSION-PROOF*
Oxygen (O₂) 0 to 25% 332627 332642
Carbon Monoxide (CO) 0 to 300 ppm 332629 332642
Hydrogen Sulfide (H₂S) 0 to 100 ppm 332628 332642
LEL Combustibles, Low-Mount 0 to 100% 332633 332642
IR Methane (CH₄), Low-Mount 0 to 100% 332632 332643
*Approved for use in classified hazardous areas (Class 1, Groups B-D).
Calibration Gases
DESCRIPTION STOCK #
LEL Methane Calibration Gas, 105 L, 50% LEL 97017
Ammonia Calibration Gas, 58 L, 25 ppm 55835
Carbon Monoxide Calibration Gas, 105 L, 50 ppm 97020
Hydrogen Sulfide Calibration Gas, 58 L, 25 ppm 55829
Chlorine Calibration Gas, 58 L, 5 ppm 97012
Oxygen Calibration Gas, 58 L, 12% 332672
Carbon Dioxide Calibration Gas, 58 L, 5000 ppm 332673
Zero Air Calibration Gas, 105 L, 20.9% Oxygen 97016
Regulator, 0.5 LPM 71674
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