Product Description:

YJJ VQ21TB 0-100% LEL Catalytic Combustion Gas Sensor for Combustible Gases

Features:

I. Basic Parameters (Paired Components: Detection Beads + Compensation Beads, Use of Wheatstone Bridge)

Principle: Catalytic beads Pellistor catalytic combustion type, modified anti-poisoning version (TB = PCB straight-through hard pins)

Power Supply Specifications: Rated 2.0V ± 0.1V, 300mA / single group, total machine power consumption ≈ 750mW

Measurement Range: 0 - 100% LEL (0 - 5% CH₄ methane), minimum detection 0.1% CH₄; Linear upper limit 3% methane

Response Time: T90 ≤ 2s, diffusion type intake

Environmental Temperature and Humidity: Working -40℃ to +70℃; Storage 10 - 25℃, 0 - 95% RH without condensation

Life Span: Normal operation ≥ 5 years, superior to ordinary catalytic beads (conventional 2 - 3 years)

Structure: Solid hard pins PCB straight-through (TB suffix defines), RoHS compliant, produced by Polish factory

Anti-interference: No interference from water vapor, CO2, resistant to silicone oil and organic solvent poisoning (core advantage)

II. Detected Gases

Methane, natural gas, propane, butane, liquefied gas, gasoline volatile gas, methanol/ethanol, VOC flammable vapor, hydrogen, and most carbon-hydrogen combustible gases

III. Product Applications

1. Instrument Accessories

Fixed industrial combustible gas detectors, wall-mounted gas alarms, explosion-proof online monitoring instruments, industrial cabinet-type gas controllers dedicated original probes

Same series: VQ21T flexible wiring, VQ21TS special hydrogen optimization model

2. Specialized Application Industries

Municipal gas: Gas stations, underground pipelines, boiler rooms for online monitoring of methane leakage

Petrochemicals: Refining plant areas, storage tanks, reaction vessels for fixed combustible gas detection

Painting / ink workshop: Paint solvents, xylene volatile explosion-proof monitoring (preferred VQ21TB for anti-poisoning)

Lithium battery, pharmaceutical factory: Organic solvents, electrolyte volatile concentration warning

Wastewater treatment / underground: Methane (methane) confined space safety monitoring

Ships / cold storage: Ship cabins, liquefied gas, refrigerant combustible component detection

Specifications: