The RKI Air Alert is a compact, wall-mounted fixed gas transmitter using electrochemical, infrared, or PID sensor elements to cover 50+ gases — from common toxics like CO, H2S, and NH3 to refrigerants, ozone, and VOCs. A clear polycarbonate window over 3-color alarm LEDs and an audible buzzer give local status at a glance, while both 4-20mA (3-wire) analog and RS-485 Modbus outputs integrate directly into a building automation or process control system.

Available with a local LED/buzzer display or a 2-relay configuration for direct alarm switching, and in a wireless, dual battery-powered version (Airlink Alert) that reports over a 900MHz radio link for installations where running wire back to a controller isn't practical. The NEMA Class I/4/4X/6 polycarbonate enclosure is IP66, UL508, and UL746C(f1) rated for indoor or outdoor mounting — this is a general-purpose transmitter, not explosion-proof rated. The configurations listed here cover the most commonly ordered gas types and power/connectivity options; additional gas ranges are available by quote.