Pipes are of fine grain practice, excellent content of non metallic inclusions. Seamless Steel Pipe For Sour Service sour service Linzhou Fengbao Pipe Industry Co.,Ltd. , https://www.cfbpcoltd.com
Several aspects to consider when choosing a domestic gas alarm
Several aspects to consider when choosing a domestic gas alarm
As flammable gases such as coal gas, liquefied petroleum gas and natural gas have generally entered residents' homes, if these gases leak during use, they will cause poisoning, fire, explosion accidents, and seriously endanger people's lives and property safety. As an important gas detector, gas leak alarm can detect the content of certain gases in the air in a timely and reliable manner, take effective measures to remedy in a timely manner, take corrective measures to reduce accidents caused by leakage, and avoid major accidents caused by leaks. Necessary conditions for property and casualties.
At present, there are many brands of gas leak detection alarms on the market. What factors do users need to consider when selecting? The following uses the technical indicators and technical parameters as references to briefly introduce you to the several aspects of reference before selection:
1. Response time
(1) Response time: the time interval from when the alarm is triggered until the system displays the detected gas. It is the most basic indicator for measuring the function of the alarm system. An alarm must be capable of detecting and displaying the detection results in an appropriate manner in a timely manner.
(2) Alarm response: The time interval from the alarm of the alarm device to the display of the alarm status by the control center. It includes the delay of the alarm, the establishment time of the communication and the delay of the control system equipment (usually sound and light display).
(3) Alarm acknowledgment time: the time interval from when the alarm is sensed to the control center to confirm that the alarm is real. It includes the time taken for the alarm response and review process, such as on-site listening and remote receiving time. This process can also include the communication time used by the control system to send an alarm and related information to the superior alarm center. In addition, the startup time of the linkage device can also be regarded as the response time. For example, the time interval from the on-site alarm of the detector to the control of the linkage device (such as closing the solenoid valve to cut off the air source and opening the exhaust fan, etc.). Alarm responses are usually short. Therefore, it is advisable to measure the alarm confirmation time or system response during specific inspection.
2. Detection area and detection sensitivity Security systems usually use detection area and detection sensitivity as evaluation indicators for alarm detection, which is different from PPS.
(1) Detection area: a certain range designed by the security system. When the gas reaches the alarm concentration in this range, the detector detects in time and sends out an alarm signal.
(2) Detection sensitivity: The detection capability of the detector to the gas leakage at the installation site is usually less than 25% of the lower explosion limit of different alarm concentrations of different gases. Compared with the conventional contact-fired sensor, the semiconductor ambient temperature sensor used in the gas alarm has a prominent feature that it does not require heating. Therefore, this element has the advantages of high sensitivity, fast response, low power consumption, and long life. Wider. The above two should be combined in actual detection. The tester can use the igniter and deflate test method to check whether the alarm can achieve gas leakage monitoring. The test has to be performed multiple times.
3. The installation environment of the detector must ensure that the detector can work stably and reliably. There must be certain requirements for its installation environment. During the installation, appropriate methods must be used to avoid and eliminate environmental interference factors.
(1) Avoid interference. Avoid installing in humid places or places with soot and dust, spray paint, alcohol and other volatile chemicals, so as not to cause false alarms.
(2) Wall-mounted installation. Before installation, the specific gravity of the combustible gas and air should be determined, and the alarm should be installed in a suitable location within 1.5 meters from the gas source radius. Gas lighter than air is installed 30cm from the ceiling; gas heavier than air is installed 30cm from the floor. The height of the interior space of a family building is generally 2.6 meters. Artificial gas—lighter than air and floating at high places; natural gas—lighter than air and floating at high places; liquefied petroleum gas—heavier than air and deposited at low places.