The fixed gas detection alarm, as the main component of the gas leak monitoring and alarm system, is a necessary condition for effectively preventing accidents caused by gas leaks. Its correct use, maintenance, and ensuring the accuracy and reliability of detection results are essential.

Gas detection alarms are precision instruments, therefore, high requirements are placed on customers in terms of instrument selection, installation, use, maintenance, and other aspects.

How to choose a gas detector?

The type of gas detection alarm used in the production process should be determined according to its purpose:

Fixed instruments should be selected for long-term continuous monitoring of flammable or toxic gases;

Portable instruments should be selected for leak detection, confirmation, and monitoring of flammable or toxic gas environments, safety inspection operations, and personal safety protection;

When the area or location to be monitored does not have the conditions for setting up fixed instruments, or when temporary work areas need to be monitored and there is a possibility of combustible, toxic gases or vapors during temporary work in the area, portable or mobile instruments should be selected.

How to set the alarm value of the gas detector?

The setting of gas detection alarm values should follow the principles of safety, science, and feasibility, which is conducive to timely response of on-site workers, taking emergency rescue measures, eliminating abnormal situations, and ensuring personal safety. The alarm value for explosive toxic gases should be set according to the requirements for preventing poisoning as a priority.

Requirements for the use of fixed gas detection alarms

In production facilities, storage and transportation, public works, and other places where toxic, harmful, flammable, and explosive materials may leak, fixed instruments should be installed when the concentration of the leaked gas may reach the alarm set value.

When the alarm controller receives the alarm signal from the detector, it should emit sound and light alarm signals, indicate the alarm location, record the alarm time, and maintain it. Only after confirming and taking measures can the alarm be manually stopped. When there is another alarm signal input, it should be able to start again. When multiple instruments alarm simultaneously, it should be possible to distinguish the instrument that alarms first.

When gas alarm signals, fault signals, and shielding signals are input, the alarm controller should display information such as the time, location, name, signal category, and location of the input signal sent by the device, and have transmission status indicators. It should also have functions such as continuous recording, accident warning, and information storage.

4. The applicable conditions of the instrument environment should meet the range of temperature, pressure, humidity, and dust changes in the actual usage environment, and the protective performance should comply with the actual usage environment of the instrument.

5. When the detector is set in outdoor and open buildings and other open places, adequate protective measures should be taken to ensure the normal operation of the detector in view of the adverse effects of adverse weather conditions, such as water vapor, rainstorm, snow, ice and dust. When there is a possibility of water ingress or retention in the protective tube connected to the detector and cable, protective measures should be taken, and the protective measures should not affect the flow of airflow obstructing the detector probe.

When the detector is in a high-temperature environment, it should be used according to the following requirements:

a) The operating temperature of the detector shall not exceed the operating temperature specified in the instrument manual;

b) The detector should be avoided from being installed directly above the heat source as much as possible, and should be installed at the same height position at a certain distance from the heat source;

c) When used in hot areas, outdoor detectors should be equipped with protective covers to avoid direct sunlight.

7. In situations where strong electromagnetic field interference cannot be avoided, shielding measures should be taken to ensure that the detector is not affected by electromagnetic interference.

8. The sensor of the detector should avoid contact with harmful substances that may cause damage to it.

Maintenance requirements for fixed gas detection alarm

1. Regular inspections should be conducted on fixed instruments, with an inspection cycle of no more than one month. The inspection mainly includes:

a) Whether the appearance is intact;

b) Is the rainproof cover function of the detector complete;

c) Whether the indication is normal;

d) Are the connecting components loose;

e) Whether the detector components are blocked;

f) Are the secondary instruments and dedicated control systems operating normally.

2. The control and alarm units of fixed instruments should be inspected to ensure that their lights, alarms, and circuits are functioning properly, with an inspection cycle of no more than 3 months.

3. Each inspection should be recorded and archived, and any problems found should be dealt with immediately.

When a fixed instrument malfunctions, personnel should be immediately arranged to confirm on site. During the malfunction, alternative solutions and safety measures should be taken to ensure personnel safety.