Use of flammable gas detectors can result in random and false alarms.
The false alarms and random alarms of combustible gas detectors are due to these reasons.
1. Installed in a place with a large air flow;
2. Installed next to vibrating objects such as air conditioners;
3. Spray paint around the combustible gas detector and spray a large amount of irritating gas;
4. When the green light is flashing (flickering is in the preheating state, and the constant light is in the working state), carry out the jet inspection;
5. During the installation process, vibration, drop and impact combustible gas detector;
6. The combustible gas detector is too close to the stove;
7. There is a lot of smoke in the room, and the gas alarm itself is covered with a certain amount of dust and oily smoke;
8. The combustible gas detector has passed its service life, etc.
When the combustible gas detector has false alarms or random alarms, you should first confirm whether the machine is a false alarm. Chuangzhizhongcheng gives the specific operation method as follows:
1. Determine whether the gas concentration is seriously exceeding the standard, and if so, take measures as soon as possible;
2. Check whether the sensor is damaged, if so, it is recommended to return to the manufacturer;
3. Check whether there is a problem with the line;
4. Check whether the setting of combustible gas detector is correct.
The combustible gas detector is a safety barrier for industrial production. Once the combustible gas detector is falsely reported, it must be paid enough attention and timely adjusted and repaired to ensure its normal use.
What is Gas Detector Calibration?
No matter what kind of gas detector, it will have an alarm function, mainly for the purpose of sending out an alarm when the instrument detects that the concentration of the target gas in the environment reaches a certain concentration. The accuracy of an instrument's detection results is an important condition for issuing a correct alarm, and the calibration of a gas detector is an important guarantee for this condition to be achieved.
The calibration of a gas detector refers to placing the instrument in a test gas of a corresponding known concentration, and comparing the detection results of the gas detector with the gas concentration to know the accuracy of the gas detector. For example, n-hexane will burn and explode at 1.1% VOL, and when the 10% alarm is set on the hexane detector, the alarm should be triggered when the hexane concentration reaches 0.1%. For catalytic combustion sensors, this concentration is quite low. The alarm value of toxic gas is much lower than that of combustible gas. Take CL2 as an example, its threshold alarm value is only 0.5ppm.
The difference between the measurement result of the re-calibrated gas detector and the measured gas concentration is generally not more than 10%, then the instrument can continue to be used without calibration. For example, if an ammonia gas detector detects 50ppm standard ammonia gas, if the measurement result of the instrument is 46ppm, then it can be considered that the detection accuracy of this ammonia gas detector is qualified without recalibration, because 46ppm is at 50±10%X50 The result is between 45~55ppm. In the same way, if the test result of this ammonia gas detector is 44ppm, then this detector needs to be recalibrated before it can be used.
The calibration of the gas detector is an important way to detect the sensitivity of the instrument and restore the accuracy of the instrument. At the same time, through testing and calibration, we can also judge whether the sensor of the gas detector has failed. Therefore, regular instrument calibration is very necessary. The general calibration is a very simple and convenient process, and only two steps are required: 1. Return the instrument to "air" that does not contain the gas to be measured; 2. Place the instrument in a standard gas containing a known concentration. Correction.
For small partners in the security industry, portable gas detectors must be reliable and must not be sloppy. Correct and regular calibration and maintenance of the detector is an essential method, which shows how important calibration is. In fact, both gas detector manufacturers and national regulations also have calibration regulations, which are usually divided into two categories:
Equipment manufacturers will require regular calibration, usually within 2-6 months, to ensure that the instrument can work normally and effectively. The manufacturer recommends that qualified users, dealers or manufacturer-authorized service personnel can calibrate the instrument.
Metrology regulations require that the calibration frequency should not be less than once every 12 months, and this calibration must be carried out in the metrology department stipulated by the state, that is to say, it needs to be calibrated in a third-party metrology institute.
