Description

Honeywell 30-2021E-24

Ultraviolet (UV) Flame Detectors a re highly sensitive to the ultraviolet radiation given off by all types of flames. Including those produced by flammable liquids and gases.
The Pyrotector Ultraviolet Flame Detector i s a compact unitized package consisting of a detection tube. Encapsulated solid-state electronic circuitry, and a dry-contact Form-C (SPDT) alarm relay. In the event of an alarm, the relay latches on. And an alarm light i s illuminates of the unit in the alarm state. The relay i s reset by momentarily interrupting power to the unit. A three-second time delay i s built in to minimize false alarms caused by the presence of sparks, lightning, etc.
These models of Detectors operate with a Geiger-Muller-type tube that utilizes an ultraviolet-sensitive photocathode within a fused silica envelope. W hen exposed to UV radiation, the photocathode emits electrons that ionize the inert gas inside the tube. This initiates the current flow that produces an alarm signal.
Application Considerations
To ensure proper operation of the detector. The viewing window and the surface of the sensing tube must b e kept clean. And free of contaminating films at all times. W hen cleaning the sensing tube, the user must exercise caution to apply minimum pressure. Minimizing the possibility of damage to the detector tube.
Cutting and welding operations within the cone of vision of the detector can generate high levels of UV radiation. That can result in the actuation of the detection system. It i s suggested that the detection system b e de-energized w hile these activities occur.
It should b e noted that ultraviolet detectors will not detect glowing embers. A high-speed ember detector should b e used for this type of application.

Honeywell 30-2021E-24

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