What are the common problems of combustible gas alarm in security? 10

The common problems of combustible gas alarms are mainly the problem of false positives and false alarms.

According to the requirements of the "GB T 50493-2019 Petrochemical Combustible Gas and Toxic Gas Detection and Alarm Design Standard", the alarm value setting shall comply with the following provisions:

1.The first-level alarm setting value of combustible gas should be less than or equal to 25%lel.

2.The secondary alarm setting value of flammable gas should be less than or equal to 50% lel.

3.The primary alarm setting value for toxic gases should be less than or equal to 100% OEL, and the secondary alarm setting value for toxic gases should be less than or equal to 200% OEL. When the range of the existing detector cannot meet the measurement requirements, the first-level alarm setting value of toxic gas shall not exceed 5% IDLH, and the second-level alarm setting value of toxic gas shall not exceed 10% IDLH.

Chicheng Electric QB10N gas detection alarm.

The main purpose of installing combustible shields or body alarms is to ensure the safety of homes and workplaces. The combustible gas alarm can detect the presence of combustible gas in the empty Hongwu gas, such as natural gas removal, propane, methane, etc. When the concentration of combustible gas is detected to exceed the set safety threshold, the alarm will sound an alarm to remind people to take timely measures to avoid dangerous events such as fire or **.

Therefore, the installation of combustible gas alarms can effectively protect people's lives and property.

Summary. Graceful.

Hello, I am happy to answer for you, you can go to the Urumqi Municipal Quality Supervision Bureau or the Provincial Bureau, but there are also places that have special testing of this kind of instrument, such as gas companies, etc., but this test is paid. I hope my answer is helpful to you

What department should the combustible gas alarm go to for testing?

Na2021-03-18 18:38:54Hello, I am happy to answer for you, you can go to the Urumqi Municipal Quality Supervision Bureau or the Provincial Bureau, but there are also places that have special tests for this kind of instruments, such as gas companies, etc., but this test is paid.

I hope my answer is helpful to you

Hello, I am happy to answer for you, you can go to the Urumqi Municipal Quality Supervision Bureau or the Provincial Bureau, but there are also places that have special testing of this kind of instrument, such as gas companies, etc., but this test is paid. I hope my answer is helpful to you

Hello, I am happy to answer for you, you can go to the Urumqi Municipal Quality Supervision Bureau or the Provincial Bureau, but there are also places that have special testing of this kind of instrument, such as gas companies, etc., but this test is paid. I hope my answer is helpful to you

Hello, I am happy to answer for you, you can go to the Urumqi Municipal Quality Supervision Bureau or the Provincial Bureau, but there are also places that have special testing of this kind of instrument, such as gas companies, etc., but this test is paid. I hope my answer is helpful to you

**This. No**oh

Usually, the alarm point of the combustible gas alarm is set to the range of 1%-25% of the lower limit of the detected combustible gas. For example, for methane (natural gas), its lower limit is 5%, that is, lel=5%=50000ppm, and the alarm point range of the corresponding natural gas alarm should be between 1%lel and 25%lel, that is, such as 3000ppm; If you want to increase the safety factor, you can also set it to 1000ppm (. However, blindly pursuing high sensitivity and reducing the alarm set point will lead to the deterioration of the anti-interference ability of the alarm, and the non-dangerous trace leakage and the change of environmental temperature, humidity or atmosphere will lead to the false alarm of the alarm, thereby reducing the accuracy and reliability of the alarm system, which is also necessary to pay attention to when setting the alarm point.

In addition, because artificial gas contains highly toxic carbon monoxide, a small amount of leakage without any danger can cause fatal poisoning accidents, so the prevention of poisoning often becomes the primary role of artificial gas alarm to monitor leakage, the setting of the alarm point should fully consider the carbon monoxide content of artificial gas, and the alarm point is set in the concentration range of carbon monoxide 100ppm-300ppm.

Why is the range of the combustible gas alarm 0 1 0 0%lel, the lower limit of each combustible gas is different, in order to facilitate the reading, the display data of the combustible gas alarm is designed to be 100 copies, and the air volume ratio is converted into the lower limit unit, the reading of the alarm point of most combustible gas alarms is between 0 1 0 0% l e l, and its increment is 1% lel a unit The amount of change in value, because the standard uses the percentage of lel to formulate the danger degree index, The typical alarm limit is 10% LEL or 25% LEL, and the setting value is set to 25% LEL on many instruments. But at any time, once the reading exceeds 25% lel means that there may be a danger of combustion or abnormal conditions, 25% is the national standard "petrochemical combustible gas and toxic gas detection and alarm design code" for the national standard, the number is GB50493-2009 in the specified alarm value, city gas is 20% lel, these set points are more scientific, as for %, 30% these are not very scientific, absolutely safe environment must be 0% lel.

First: the combustible gas alarm range is 0-100%lel Second: there are two alarm points of the combustible gas alarm, the first-level alarm value is 25%lel, and the second-level alarm value is 50%lel

Third: each combustible gas looks like 25 and 50 on the surface, but there is actually a big difference.

Fourth: the alarm point setting is determined according to the limit value of the detected medium, no matter which gas limit value, it must be divided into 100 equal parts, and then set two high and low alarm values.

Fifth: For example, the lower limit of methane ** is 5%, then the range is 0-100%lel, this is to divide 5% into 100 equal parts, and then set two first-level and second-level alarm values. The same is true for other flammable and explosive gases.

Combustible gas alarm system alarm value setting: the low limit is default.

25%LEL: (5 lel 40 lel adjustable) The high limit is 50% LEL by default: (10 lel 100 lel adjustable) Combustible gas alarm value setting basis.

For the combustible gas alarm or gas alarm currently in use, the alarm point of the gas alarm must be set before installation. A small amount of gas leakage forms a lower concentration in the air, which will not cause fire, ** accident, and there is not much harm, so it is also very important to install a gas alarm, so that the alarm prompt can give us preventive measures in advance.

The measurement range of the combustible gas alarm is 0-100%lel, and the low report is generally set to alarm between 15%lel and 25%lel according to national regulations, and the high report is generally set to 50%lel alarm.

Most of the low alarm points for gas gas alarms are set to 25%LEL. 100%lel here refers to the gas.

The limit value is just when the flammable gas alarm shows 100% lel.

Reach the lower limit of flammable gases.

Because the standard uses the percentage of LEL to formulate the hazard level index, the alarm point of most combustible gas alarms is set to read between 0 1 0 0 l e l, in an absolutely safe environment must be 0% lel, its increment is the amount of 1% lel change, 20% lel is the most conservative or highest acceptable alarm set point for monitoring flammable and explosive gases or mixtures, the set value on many instruments is set to 20% lel, once the reading exceeds 2 0 % l e l This means that there may be a danger of burning or that it is not an anomaly. However, the general alarm limit is 10% or 25% LEL at any given time.

The low limit defaults to 25%LEL (5 LEL 40 LEL adjustable);

The default limit is 50% lel (10 lel and 100 lel adjustable).

The setting is based on the following:

The measurement range of the combustible gas alarm is 0-100%lel, and the low report is generally set between 15% lel and 25% lel in accordance with the national regulations, and the high report is generally set to 50% lel alarm, and most of the low alarm points of the current combustible gas alarm are set to 25% lel. The 100%lel here refers to the ** limit value of the gas, that is to say, when the combustible gas alarm shows 100%lel, it has just reached the ** lower limit of the combustible gas.

Most combustible gas alarms have alarm point settings that read between 0 1 0 0 l e l, and its increments are 1% lel variation, because standards use the percentage of lel to set hazard indicators, the general alarm limit is 10% or 25% lel, and the set value is set to 20% lel on many instruments. However, at any time, a reading of more than 2 0 % l e l means that there may be a risk of combustion or an abnormal condition, 20% lel is the most conservative or highest acceptable alarm set point for monitoring flammable and explosive gases or mixtures, and it must be 0% lel in an absolutely safe environment.

It is standardized, GB15322 national standard.

Alarm setpoint.

When the detector has two alarm setting values, the low limit alarm setting value should be in the range of 1%lel and 25%lel, and the high-limit alarm setting value should be 50 lel; Detectors with only one alarm setpoint should have an alarm setpoint in the range of 1%lel and 25%lel.

The alarm value of the combustible gas alarm system is set as: The low limit is 25%lel by default (5 lel 40 lel adjustable); The default limit is 50% lel (10 lel and 100 lel adjustable).

The setting basis is as follows: the measurement range of the combustible gas alarm is 0-100%lel, and the low report is generally set between 15%lel and 25%lel in accordance with national regulations, and when the detector has two alarm setting values of low limit and high limit, the low limit alarm setting value should be in the range of 1% lel and 25% lel, and the high limit alarm setting value should be 50 lel; Detectors with only one alarm setpoint should have an alarm setpoint in the range of 1%lel and 25%lel.

There are one and two levels of combustible gas alarms, the first level alarm is 25% lel, and the second level alarm is 50% lel, according to the national standard GB50493-2009

Why is the range of the combustible gas alarm 0 1 0 0%lel, the lower limit of each combustible gas is different, in order to facilitate the reading, the display data of the combustible gas alarm is designed to be 100 copies, and the air volume ratio is converted into the lower limit unit, the reading of the alarm point of most combustible gas alarms is between 0 1 0 0% l e l, and its increment is 1% lel a unit The amount of change in value, because the standard uses the percentage of lel to formulate the danger degree index, The typical alarm limit is 10% LEL or 25% LEL, and the setting value is set to 25% LEL on many instruments.

1. When the detector alarm is caused by gas leakage and the automatic shut-off device is activated, do not turn on any electrical switch after turning on the light; The window should be opened immediately for ventilation, and after the red indicator light of the detector is turned off, the cause of the burner leakage should be found and confirmed (if the cause cannot be confirmed, the relevant gas company should be contacted for treatment) and eliminated.

2. Confirm that the detector will not continue to alarm (the burner will not continue to leak), press the manual switch to open the automatic cut-off device and restore the gas supply.

3. Do not use the power supply of the detector at will, in case the detector cannot work normally.

RK-4000P combustible gas alarm.

1. First check whether there is a leakage point;

2. If there is no leakage point, it can be silenced, if the concentration value of the gas alarm is below 20%, it can be reset directly (Jinan), or it can be turned off and restarted (etc.@Shuang'an@ is the same as reset);

3. If there is a leakage point, eliminate the leakage point first, and then repeat the second step, and the gas * alarm ......Manufacturer@Provide.