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Questions and Answers
What is the primary purpose of the UV sensing tube in the UV flame detector?
What is the primary purpose of the UV sensing tube in the UV flame detector?
- To provide electrical connections between components
- To control the detector's operation
- To protect the detector from explosions
- To detect UV light emitted by a flame (correct)
How does the UV flame detector activate its alarm?
How does the UV flame detector activate its alarm?
- By sensing the sound of a flame
- When the flame becomes visible to the human eye
- Through a rise in current due to temperature increase (correct)
- By detecting pressure changes in the environment
What role do program switches play in the UV flame detector?
What role do program switches play in the UV flame detector?
- They allow the user to set specific operational criteria (correct)
- They connect various components electrically
- They protect against external explosions
- They add additional sensitivity to the semiconductor
Which component of the UV flame detector provides support and stabilization?
Which component of the UV flame detector provides support and stabilization?
What is a significant feature of the semiconductor used in the UV flame detector?
What is a significant feature of the semiconductor used in the UV flame detector?
Flashcards
UV Flame Detector
UV Flame Detector
A fire detector that detects flames using ultraviolet light.
UV Sensing Tube
UV Sensing Tube
Component that detects the UV light emitted by flames.
Semiconductor
Semiconductor
Material sensitive to temperature changes in the detector.
Explosion Proof Housing
Explosion Proof Housing
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Program Switches
Program Switches
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Study Notes
Restorable Semiconductor Line-Type Heat Detectors
- Uses a sensitive semiconductor material as the sensing element
- Contains a small central conductor
- A small current flows when temperatures are normal
- As temperatures increase, resistance decreases, allowing more current to flow and triggering an alarm
- Designed for cable trays, conveyors, electrical switchgear, warehouses, mines, pipelines, hangars, etc.
Non-Restorable Fusible Line-Type Heat Detectors
- Uses two steel wires separated by heat-sensitive insulation
- When temperatures reach a threshold, insulation melts, connecting the wires, and initiating an alarm
- Melted sections require replacement for system restoration
- Special controls can pinpoint the specific fire location
UV Flame Detectors
- Use silicon carbide, aluminum nitrate, or gas-filled tubes as sensing elements
- Flame's UV radiation ionizes the gas, making it conductive and triggering an alarm
- Designed to detect UV radiation from a flame
IR Flame Detectors
- Use a filter and lens system that screens out unwanted radiant energy
- Focuses incoming infrared radiation on light-sensitive components
- Can detect total infrared content or specific frequencies of flame flicker
- Designed for indoor use and include filtering systems or solar-sensing circuits to avoid false alarms from sunlight
- Combination UV/IR detectors are more common now, improving accuracy by minimizing false alarms from other sources.
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