Automated Fire Systems, Inc. offers continuous fire detection via both the vertical and horizontal mounting types of the Fenwal DETECT-A-FIRE® Heat Detectors. We are an authorized distributor and can install your heat detection system in the Charlotte, NC area! The Fenwal DETECT-A-FIRE® heat detectors are state of the art offering you the ultimate piece of mind when it comes to safe guarding your assets, compared to the traditional fixed temperature and rate-of-rise style heat detectors.
Please contact our office for more information regarding Fenwal DETECT-A-FIRE® heat detectors.
DETECT-A-FIRE® (DAF®) units have met with wide acceptance because they are designed with rate compensation. This provides a unique advantage over both fixed temperature and rate-of-rise types of detectors because only the DAF® unit accurately senses the surrounding air temperature regardless of the fire growth rate. At precisely the predetrmined danger point, the system is activated.
Fixed temperature detectors must be completely heated to alarm temperature and therefore a disastrous lag in time may occur with a fast rate fire. Rate-of-rise devices, on the other hand are triggered by the rate of increase in ambient temperature and are subject to false alarms caused by harmless, transient thermal gradients such as the rush of warm air from process ovens.
The secret of the unit’s sensitivity is in the design. The outer shell is made of rapidly expanding alloy which closely follows changes in surrounding air temperature. The inner struts are made of a lower expanding alloy. Designed to resist thermal energy absorption and sealed inside the shell, the struts follow temperature changes more slowly.
A slow rate of fire will heat the shell and struts together. At the “set point”, the unit will trigger, actuating the alarm or releasing the extinguishment. A transient rush of warm air up to 40°F/min. may expand the shell, but not enough to trigger the unit. By ignoring transient warm air excursions, the DAF® unit virtually eliminates false alarms prevalent with rate-of-rise devices.
If a fast rate fire alerts, the shell will expand rapidly. The struts will close, actuating the alarm or releasing the agent. The faster the fire rate of growth, the sooner the DAF® unit will react.