MTI Industries 35-741-WT Safe-T-Alert Dual Carbon Monoxide/Propane Alarm
Updated June 17, 2026
The MTI Industries 35-741-WT Safe-T-Alert is a dual-purpose alarm that detects both carbon monoxide (CO) and propane (LP) gas. Designed for the rugged RV environment, it is suitable for Class A motorhomes, travel trailers, fifth wheels, and other recreational vehicles. It is also used in boats and campers. The alarm is hardwired to a 12V DC power source and mounts on a surface. It is listed to UL 1484 (RV propane alarms) and UL 2034 (RV CO alarms).
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How It Works
The alarm uses separate sensors for carbon monoxide and propane gas. When either gas reaches a dangerous level, the alarm emits a loud beeping pattern and an LED indicator lights up. The propane sensor has an 8-second delay to confirm gas levels before alarming. The unit is designed to withstand vibration, shock, humidity, and temperature extremes common in RVs.
Common Failure Symptoms
Over time, sensors can degrade. Common issues include false alarms (often due to sensor contamination or low battery voltage), failure to alarm when gas is present, or the unit reaching its end-of-life (typically 5 years from manufacture). The alarm may chirp intermittently to indicate end-of-life or a malfunction. Regular testing is recommended.
Installation Notes
The alarm is surface-mounted and requires a 12V DC hardwired connection. It should be installed in a location where it can detect both CO and propane (propane is heavier than air, so near floor level; CO is lighter, so at breathing height). Follow manufacturer guidelines for placement. Test weekly using the test button. Replace the unit every 5 years.
