How do I test my Fenwal heat detector?
Using a a heat gun, hair dryer, or similar heat source, apply heat evenly to the complete sensing shell. The heated air temperature must be above the alarm set point temperature of the unit. will either close or open which can be verified with a standard OHM meter. Remove the heat immediately after activation.
What is Fenwal system?
The Fenwal system uses a slender inconel tube packed with thermally sensitive eutectic salt and a nickel wire center conductor. When the fire has been extinguished or the critical temperature lowered, the Fenwal system automatically returns to standby alert, ready to detect any subsequent fire or overheat condition.
What is Rate compensated heat detector?
Rate Compensated Thermal Detectors are designed to compensate for thermal lag. When a rate-compensation heat detector operates, the actual operating temperature will be approximately equal to the rated operating temperature, regardless of the rate at which the air is being heated.
What are the three components of the Fenwal sensing element?
The Fenwal sensing element consists of a small (. 089 inch OD), lightweight, flexible Inconel tube with a nickel wire center conductor. The tube is packed with insulation impregnated with a special salt compound and is hermetically sealed.
What is a spot type heat detector?
Heat detectors are used in confined areas for detection of fires around hazardous locations. The detector is a thermistor type, enabling adjustment of temperature response by the controller.
How many types of heat detectors are there?
There are two common types of heat detectors—fixed temperature and rate of rise. Both rely on the heat of a fire incident to activate the signal device.
What temperature does a heat detector go off?
Typically, the preset temperature that triggers the alarm is around 135 degrees. High temperatures are a good indicator of fire (unless you have your heater set to 135 degrees). Both the rate-of-rise detectors and the fixed temperature detectors are great for sensing fires.
How does a Fenwal single element system operate?
The Fenwal Continuous Fire Detection System stands alone in its field with the unique ability to detect specific overheat conditions at any point along the entire length of its sensing element run without regard for rate of temperature rise or average ambient temperature.
How are Fenwal sensing elements wired?
How are Fenwal sensing elements wired? One or more wires imbedded in a special ceramic core that changes its resistance with a change in temperature.