False Alarm/Missed Alarm of Fire Alarm? It Could Be the NTC Thermistor "Triggering the Alarm"
In fire alarm system, temperature detection is key to early fire warning. NTC thermistor, with its sensitive temperature sensing capability, can provide decision-making data for the alarm system by monitoring the ambient temperature changes in real time.
To ensure the timeliness and reliability of temperature detection in fire alarm system, the installation position of the NTC thermistor is crucial. Generally, the NTC is placed on the PCB of temperature detection module of the alarm so that its sensing head can fully contact the ambient air, allowing rapid obtainment of temperature information. Specifically, as the ambient temperature rises, the resistance value of the NTC thermistor decreases, causing the voltage at the voltage divider node to increase. After conversion by ADC, the MCU processes the data in real time. In fire alarm system, multiple temperature thresholds are preset.. When the measured temperature exceeds the critical value, corresponding emergency measures will be triggered. For example, when the temperature detected by the thermistor exceeds the first-level warning threshold, the system enters pre-alarm mode. If the temperature exceeds the second-level warning threshold, the alarm will be triggered immediately. With the help of NTC thermistor, fire alarm system can better know ambient temperature conditions, enhancing monitoring capability while maintaining long-term operational stability.
As the first line of defense for fire alarm system, NTC thermistor provides real-time ambient temperature monitoring using its thermal characteristics, reducing the risk of fire occurrence and protecting lives and property of people. To further ensure the stable operation of fire alarm system, EXSENSE recommends using the LT series epoxy-encapsulated NTC thermistor. This product offers:
1. Rapid response, enhancing the timeliness of early warning
The small-dimension sensing head of the LT series epoxy-encapsulated NTC thermistor ensures high sensitivity, allowing it to quickly obtain accurate temperature data even in sudden temperature changes, thus securing a critical time window for subsequent fire linkage. When the NTC detects early abnormal temperature conditions of a fire, the fire alarm system can trigger an alarm in a short time, providing crucial time for personnel evacuation and firefighting.
2. High accuracy, enhancing reliable temperature monitoring
EXSENSE epoxy-encapsulated NTC thermistor offers high temperature measurement accuracy (can reach to ±1%), aiding fire alarm system in distinguishing normal environmental temperature fluctuations from early-stage fire temperature rises. This significantly reduces the risk of false alarm or missed alarm, ensuring high reliable operation of the system.
3. Weatherability, enhancing environmental adaptability
With excellent electrical performance, the LT series epoxy-encapsulated thermistor remains stable under various harsh conditions, providing effective and accuracy ambient temperature monitoring for fire alarm system, greatly enhancing their applicability and service life.
In summary, EXSENSE LT series epoxy-encapsulated NTC thermistor not only improves the temperature measurement accuracy of fire alarm system but also strengthens system response timeliness, making it indispensable components for the fire alarm system.
