Flammable Gas Detector Alarm for Gas Concentration Monitoring

Product Description

 

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    Product Introduction

    Our gas alarm detector serves as the core component of industrial safety monitoring systems. Equipped with high-precision sensors, it enables real-time monitoring of flammable gases, toxic and harmful gases (such as CO and H2S), and oxygen levels in the environment.

    When gas concentrations exceed safety thresholds, the device automatically triggers audible and visual alarms, providing continuous online monitoring and early leak warning for high-risk scenarios including petrochemical plants, gas stations, and wastewater treatment facilities. It is widely used in industrial explosion protection, environmental monitoring, and safety production management applications.

    
     

    

    

    Core Product Advantages

    1.Accurate Detection & Rapid Response

    Built with high-precision electrochemical, catalytic combustion or infrared sensors, featuring a resolution of 0.1%LEL for flammable gases and 0.1ppm for toxic gases. With a response time ≤30s, it captures gas leakage signals instantly.

    2.Stable, Durable & Highly Resistant to Interference

    The explosion-proof housing (IP65/IP67 rated) delivers excellent resistance to high temperatures, corrosion and electromagnetic interference, making it ideal for complex industrial environments. It offers a service life of ≥2 years.

    3.Smart Operation & Easy Maintenance

    A large display shows real-time concentration and alarm status. It supports infrared remote control or magnetic rod calibration for cover-free maintenance, while the modular design allows for quick sensor replacement.

    4.Multi-Scenario Adaptability & Strong Compatibility

    Capable of detecting over 30 gas types, it supports 4-20mA and RS485 signal outputs, and is fully compatible with DCS/PLC systems for seamless remote monitoring integration.

    5.Multi-Level Protection & High Reliability

    Dual high/low concentration alarm settings, combined with sound-light and relay output linkage, work with the built-in self-diagnosis function to effectively prevent false or missed alarms.

How it works

Main Components

• Sensor: The core component responsible for detecting flammable gas concentrations. Common types include:
  • Catalytic combustion sensor: Suitable for most flammable gases. It generates signals through temperature changes of internal components caused by gas combustion.
  • Semiconductor sensor: Features high sensitivity and fast response, though with relatively low selectivity.
  Alarm controller: Receives, processes and judges signals from the sensor. When the gas concentration exceeds the preset threshold, it triggers the alarm device.
• Alarm device: Usually includes an acoustic-optical alarm, which emits a sharp sound and flashing lights to alert on-site personnel.

     

 

 

Types of Detectable Gases

This detector supports monitoring of common flammable gases, including methane (CH4), propane (C3H8), hydrogen (H2), acetylene (C2H2), ethanol (C2H5OH), and more. Multi-gas detection is available on select models via replaceable sensors, with clear compatibility ranges provided.

Detection Principles (By Sensor Type):

Catalytic Combustion Type: Ideal for most flammable gases, offering a wide detection range.

• Semiconductor Type: High sensitivity for reliable low-concentration detection.
• Infrared Type: Excellent anti-poisoning performance and long service life, often used for specific gases such as methane.

 

 

 

Environmental Adaptation Parameters
Operating Temperature
Fixed type: -40ºC to +70ºC, engineered for industrial applications to withstand extreme high and low temperatures.
Portable type: -20ºC to +50ºC, designed for routine inspections in milder environments.
Exceeding the specified range may impact sensor performance; additional protection measures (such as thermal insulation or heat dissipation devices) are required in such cases.
Operating Humidity
Typically 10%~95% RH (non-condensing). High-humidity environments (e.g., humid workshops) require moisture-proof design to prevent short circuits or sensor failure.
Explosion-Proof Rating
A critical safety parameter. For example, Ex d II CT6 (flameproof type) is suitable for Zone II, Category C explosive atmospheres, with a maximum surface temperature of ≤85ºC. The rating must be selected based on the explosion hazard level of the installation site to prevent the device from becoming an ignition source.
Protection Rating
For example, IP65 (dust-tight, protected against low-pressure water jets). For outdoor or dusty environments, higher ratings such as IP66 or IP67 are recommended.

 

Technical features

Alarm Methods
• Acoustic-optical alarm: Sound intensity ≥85dB (at 1m distance); red flashing light with a visual range ≥20m.
• Other options: Vibration alarm (for portable units), remote alarm (linked with control systems).  
Signal Output
• Analog signal: 4-20mA current output, featuring long transmission distance and compatibility with PLC/DCS systems.
• Digital signals:
  RS485 (Modbus protocol) for seamless data upload to monitoring platforms.
  Switch output for interlocking with valves/fans, with a typical capacity of AC220V 5A.

 

 

• Working Principle

  1. Gas Sampling: Collect ambient gas via pump suction or diffusion mode and send it to the sensor detection chamber.
  2. Signal Conversion: The sensor reacts with the target gas (e.g., catalytic combustion, electrochemical reaction) to generate an electrical signal proportional to the gas concentration.
  3. Data Processing: The built-in microprocessor amplifies, filters and AD-converts the electrical signal to calculate and display the gas concentration value.
  4. Alarm Judgment: When the detected concentration exceeds the preset alarm threshold, it drives the buzzer and LED indicator to emit sound-light alarms, and outputs switch/analog signals to link external devices (e.g., solenoid valves, exhaust fans).
  5. Status Feedback: Upload concentration data and alarm status to the control system in real time for remote monitoring and data traceability.

 

Maintenance and Calibration

To guarantee stable performance and accurate detection, regular maintenance and calibration are necessary.

 

• • Clean the sensor periodically to avoid interference from dust, oil and other contaminants.
• • Perform calibration with standard gas as instructed, to keep the alarm threshold precise.
• • Inspect the alarm unit routinely to ensure full 
• functionality of audible and visual alerts.

 

Application Scenarios

 

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Company Profile

 

Address: Huji Industrial Park, Deshang Expressway, Mudan District, Heze City, Shandong Province, China
Business type: Manufacturer/factory, trading company
Business scope: manufacturing and processing machinery
Management system certification: ISO9001:2015 ISO45001:2018 ISO14001:2015
Main products: Ground flare, Biogas flares, flare stack,
Thermal Oxidation Furnace, Flue gas purification equipment

Heze Zexuan Equipment Manufacturing Co., Ltd. is an enterprise engaged in the manufacture of special equipment for environmental protection; sales of special equipment for environmental protection; application of industrial automation technology; sales of power electronic components; research and development of mechanical equipment; sales of intelligent instruments and meters; manufacturing of intelligent instruments and meters; research and development and promotion of comprehensive utilization of waste gas and VOCs treatment technology.
The company's main products and service directions: manufacturing of ground torches, elevated torches, waste gas venting torches, biogas torches, three waste incinerators, and wastewater treatment equipment, industrial automation and DCS system applications, wastewater treatment projects, VOCs treatment equipment and engineering construction, petrochemical accessories and instrument sales, petrochemical equipment installation, maintenance and repair, etc.; support product customization services and OEM services in the same industry, from design to manufacturing, installation, commissioning, and after-sales one-stop service.

 

Certifications

 

 

 

 

 

 

FAQ

• Q: What is the function of a combustible gas alarm?

   

  A: Real-time gas concentration monitoring with audible-visual alarm to prevent explosions.
   
• Q: Which gases can it detect?

   

  A: Methane, propane, hydrogen, acetylene, ethanol, natural gas, etc.
   
• Q: What's the difference between fixed and portable models?

   

  A: Fixed: 24/7 on-line monitoring; Portable: for on-site inspection.
   
• Q: What does explosion-proof rating mean?

   

  A: Safety level for use in hazardous areas (e.g., Ex d II CT6).
   
• Q: What alarm methods are available?

   

  A: Audible-visual alarm, optional vibration and remote alarm.
   
• Q: What signal outputs does it support?

   

  A: 4-20mA, RS485 (Modbus), and switch output.
   
• Q: What sensor types are used?

   

  A: Catalytic combustion, semiconductor, and infrared sensors.
   
• Q: What are the operating conditions?

   

  A: Fixed: -40ºC~+70ºC, 10%~95%RH (non-condensing).
   
• Q: What maintenance is required?

   

  A: Regular cleaning, calibration with standard gas, and alarm function testing.
   
• Q: What to note during installation?

   

  A: Install at correct height, avoid EMI, and ensure proper grounding.

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