RKI AirLink T3A Wireless Gas Detector, 3-Wire Power, No Relays (each)

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Airlink T3A Wireless Monitor

Explosion Proof Transmitter

• Explosion Proof, Class I, Division 1 for CO, H2S, O2, LEL, & CO2
• Class I, Division 2 for all other gases


  •  Electrochemical, Infrared, catalytic bead sensor element
  • Wire powered (3-Wire), 12 to 35 VDC operating voltage

  • Output options:
    Wireless 900 MHz or 2.4 GHz
    4-20mA (3-wire) analog
    RS-485 modbus

  • Digital Modbus output

  • Operating temperature range -40°C to +54°C

  • Graphical LCD with LED backlight

  • 3 Push-button interface (ADD, MENU, SUB) with 3 corresponding magnetic, non-intrusive switches

  • 2 Individually configurable alarms

  • 2 Front panel LED indicators (amber and red)

  • 2 Optional fully programmable alarm relays (dry contacts)


The AirLink T3A Series Gas Detector ambient air hazardous gas detector is a versatile assembly  that uses an electrochemical, infrared, catalytic bead sensor element to detect a variety of gases. Wired power (12 to 35 VDC) with wireless communication controller. An RKI wireless T3A also has 4-20 mA analog and RS-485 Modbus outputs as standard. Magnetic switches allow for non-intrusive calibration while in the field as well as full system settings and diagnostics.

The Airlink T3A represents the latest leading edge technology in fixed gas detection today.


Sensor Type Electrochemical, infrared, catalytic bead
Operating Voltage Wired power (3-Wire) 12 to 35 VDC
Power Draw 2 Watts maximum
Protection Power electromagnetic interference (EMI) filter


4-20 mA surge suppression

RS-485 surge suppression

Display Screen 102×64 Resolution graphical LCD screen transflective (sunlight readable) with white LED backlight
Interface 3 Push-buttons (MENU, ADD and SUB)


3 Magnetic non-intrusive switches for calibration

Customizable Settings 2 Individual-configurable alarm LED/relay set-points
Temperature Range -40°C to +54°C (-40°F to +130°F)
Wireless Output, Radio Options 900 MHz (200 mW) radio (1-1.5 miles range) or 2.4 GHz (125 mW) radio
(1-1.5 miles range)
Networks 52 Networks (900 MHz radio) or 78 networks (2.4 GHz radio)


255 addresses per network

Output (digital) RS-485 modbus
Wired (Analog) Output 4-20 mA (3-Wire)


Fault terminal

Optional 2 dry-contact relays with replaceable 4 amp fuses

Remote Sensor Kit


(Optional Additional Feature)

Remote sensor kit with enclosure (5 pin)


• Electrochemical sensor max. length: 250 feet

• Infrared sensor max. length: 40 feet

• Catalytic bead sensor max. length: 15 feet

Product Dimensions 5.5 in, L x 6 in. D x 7 in. H (8 in. W x 17 in. H Max. dimensions with attachments)
Total Weight 6 lbs.
Hazardous Location



Main Enclosure Certified explosion / flame proof CQPSUS


Class I, Division 1 & 2, Groups B, C & D

Nema 3, 4, 4X, 7 (B, C, D) 9 (E, F, G)

Temp.= -20°C to +60°C

Sensor Housing Certified explosion / flame proof CQPSUS


Class I, Division 1 & 2, Groups B, C & D

Temp.= -40°C to +60°C

Note: Certification only applies to some gases. Toxic gases not certified for Div. 1 locations are suitable for Div. 2 applications but have no third party approval.

Controllers, Wireless Compatible with AirLink 7010 and AirLink 7032
Controllers, Analog Compatible with all RKI Beacon controllers, as well as most DCS / PLC systems: Beacon 110, Beacon 200, Beacon 410A and Beacon 800, and MC-6400
Warranty 1-Year warranty for electronics and sensor


Contact us for returns within 14 days. 10% restocking fee will apply to most items. Made-to-order and custom items are non-returnable, non-refundable. Customer will be liable for return shipping costs. Many items ship direct from manufacturer.

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