AZ INSTRUMENT Explosive Gas Meter VZ7291

The AZ INSTRUMENT Explosive Gas Meter VZ7291 is a professional-grade gas detection device designed for monitoring explosive gases in industrial and commercial environments. Utilizing catalytic combustion (pellistor) sensor technology, it provides accurate and reliable measurement of Lower Explosive Limit (LEL) for methane, propane, butane, LPG, and natural gas. This wall-mounted unit features dual alarm thresholds, analog and digital outputs, and robust IP54-rated housing for demanding applications.

Advantages

High sensitivity and fast response time (<30s T90) ensure early detection of gas leaks. Dual relay outputs allow integration with external alarms or ventilation systems. The 4-20 mA analog output and RS-485 Modbus RTU digital interface enable seamless connection to building management systems. Long sensor life (3-5 years) and CE certification guarantee reliability and safety compliance.

Suitable for

• Industrial plants and factories
• Commercial kitchens and boiler rooms
• Gas storage and distribution facilities
• Parking garages and tunnels
• Laboratories and research facilities

Key specifications

• Detection Principle: Catalytic Combustion (Pellistor)
• Detected Gases: Methane, Propane, Butane, LPG, Natural Gas
• Detection Range: 0-100% LEL
• Pre-Alarm Threshold: 10% LEL
• Main Alarm Threshold: 20% LEL
• Analog Output: 4-20 mA
• Digital Output: RS-485 Modbus RTU
• Relay Outputs: 2 (Pre-alarm, Main alarm)
• Power Supply: 12-24V DC
• Power Consumption: Max. 2W
• Operating Temperature: -20°C to +50°C
• Operating Humidity: 10-95% RH (non-condensing)
• Enclosure Rating: IP54
• Housing Material: ABS Plastic
• Response Time (T90): <30 seconds
• Sensor Life Expectancy: 3-5 years
• Certifications: CE
• Mounting Type: Wall-mounted
• Visual Indicators: Power, Pre-alarm, Main alarm, Fault LEDs

Recommendations

For optimal safety, install the VZ7291 in areas where gas leaks may occur. Regular calibration and sensor replacement every 3-5 years are recommended. Ensure power supply is within 12-24V DC and avoid exposure to extreme temperatures or corrosive environments.