In the previous issue, we included the selection and setting requirements of fire detector . How are the crew members learning? Today, the ship continues to introduce the knowledge about fire detectors to you, including its debugging, detection, maintenance and fault handling. Next, we will prepare for the battle and fight again!
1. Test
2. Detection quantity
fire detector (including combustible gas detector ), simulated fire response (combustible gas alarm) and fault signal inspection according to the following requirements:
1. The actual installed quantity ≤100 , and the sampling 20 (each loop should be sampling);
2. The actual number of installed >100 s, and each loop is inspected according to the ratio of 10% to 20% s in actual installed , but the total number of selected should be ≥20 s.
3. Use and maintain
1. point smoke sensor fire detector is put into operation 2 years , should be cleaned every 3 years at least all .
2. The aspirated fire detector sampled through the sampling tube needs to be regularly rinsed on the sampling pipeline according to the different usage environment. The longest time interval should ≤ 1 year .
3. Different types of detectors should have 10% and ≥50 products.
4. Each quarter, uses a special detection instrument phased batch test detector action and confirmation light display.
5. every year uses a special detection instrument to test and manual alarm device at least 81 times for all installed detectors .
4. Common faults and methods
1. Fault phenomenon:
Fire alarm controller issues fault alarm , fault indicator light lit , printer printing detector fault type, time, location , etc.
2. Failure:
1) The detector is disconnected from the base, and the is in contact with the base ;
2) The alarm bus is in contact with the base , and the
3) The alarm bus is open circuit or grounding poor performance causes short circuit ;
4) The detector itself is damaged ;
5) The detector interface board is faulty .
3. Troubleshooting method:
1) Re- tighten the detector or to increase the contact area of the base and the detector spring ;
2) Re-crimp the bus to make it have good contact with the ;
3) Find the faulty bus position and replace with ;
4) Re-replace detector with ;
5) repair or to replace interface board.
Seeing the above knowledge, have you increased your confidence in preparing for the exam? In fact, click "Learn More" below to get different new test points and knowledge points to help you pass the exam smoothly!
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