CO2 Alarm Station (blue light)

What the AS-4 Is

The TrolMaster AS-4 is an audible-visual alarm module within the Carbon-X CO2 safety and monitoring ecosystem. It combines a high-visibility blue LED strobe with an LCD screen that shows live CO2 ppm readings, giving anyone approaching a grow room immediate, at-a-glance awareness of atmospheric CO2 conditions. The unit is purpose-built to mount outside the monitored space — on corridor walls, above entry doors, or in hallways adjacent to cultivation rooms — so staff can assess conditions before entering. When CO2 levels exceed the threshold set in the Carbon-X main controller (CDA-1), the AS-4 simultaneously sounds its audible alarm and begins blinking the blue LED indicator, providing both audio and visible notification that conditions inside the room require attention.

Who It's For

The AS-4 is a fit for any licensed indoor cannabis or hemp operation that uses supplemental CO2 enrichment and needs to satisfy local or state safety regulations governing CO2 monitoring and alarming. Multi-room facilities — whether single-site vertical grows, multi-suite licensed producers, or multi-building campuses — benefit most, since the Carbon-X system supports up to 13 separately monitored zones and up to 40 total output device stations. Operators building out new facilities, adding canopy, or going through state compliance inspections will find the AS-4 a required component for any room in their Carbon-X build-out. Facility managers spec-ing alarm colors to meet jurisdiction-specific fire or safety code requirements should note the Carbon-X alarm station line is available in multiple indicator colors (blue, orange, mixed); the AS-4 covers the blue requirement.

Key Features

Blue LED indicator: The blue LED display indicator activates — strobing — when the CO2 level exceeds the user-configured limit in the CDA-1 controller, providing a visually distinct warning that is identifiable from a distance and can be matched to site-specific color-coding requirements.

LCD digital ppm readout: The station continuously displays the current CO2 ppm level on its LCD screen, not just alarm state — so staff walking the floor can check levels without accessing a controller panel or app.

Dual-sensor linkage for redundancy: The AS-4 can be linked to either the AL-1 or AL-2 CO2 sensor channel on the Carbon-X controller, or linked to both sensor channels simultaneously for full redundancy — ensuring the alarm fires on a fault in either sensor without requiring two separate alarm stations.

RJ12 plug-and-play connection: Like all Carbon-X modules, the AS-4 connects via standard RJ12 cable. The included 16 ft RJ12 cable provides immediate installation reach. Note: the AS-4 requires the SPH-1 Splitter Hub for supplemental power delivery over the RJ12 line — the SPH-1 eliminates the need for a separate power source at each alarm station.

How the AS-4 Fits a Carbon-X Build

The Carbon-X system is a modular CO2 safety architecture centered on the CDA-1 main controller. Each monitored zone requires at minimum one CO2 sensor (MBS-K30) and one audio-visual alarm station. The AS-4 fills the alarm-station role for zones where blue is the required or preferred indicator color. All alarm stations, including the AS-4, must be connected through a powered SPH-1 Splitter Hub — the hub delivers power over the shared RJ12 communications cable, keeping installation clean with no per-device power wiring. The system supports both high-level (up to 30,000 ppm) and low-level (5,000 ppm) alert thresholds, both user-adjustable to match local regulations. When the Carbon-X detects an exceedance, it can simultaneously trigger alarm stations like the AS-4, activate ventilation via the DSC-1, shut the main CO2 solenoid via the DSE-1, and send a dry contact signal to a facility fire alarm panel via the DSD-1 — all from a single event trigger. Remote monitoring and push notifications are also available through the TrolMaster mobile app with internet connectivity enabled on the CDA-1.