ShenzhenYijiajie Electronic Co., Ltd.
| Power supply specification | Rated 2.0V ± 0.1V, 300mA |
| Storage | 10 - 25℃, 0 - 95% RH |
| Environmental temperature and humidity | -40℃ to +70℃ |
| Measurement range | 0.1% CH4 |
| Linear upper limit | 3% methane |
| Packaging Details | Palletized |
| Payment Terms | L/C, D/A, D/P, T/T, , |
| Overall power consumption | ≈ 750mW |
| Response time | T90 ≤ 2s |
| Life expectancy | ≥ 5 years |
| Supply Ability | 1500 |
| Delivery Time | 5-8 days |
| Model Number | VQ21TB |
| Brand Name | YJJ |
| Place of Origin | Britain |
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Product Specification
| Power supply specification | Rated 2.0V ± 0.1V, 300mA | Storage | 10 - 25℃, 0 - 95% RH |
| Environmental temperature and humidity | -40℃ to +70℃ | Measurement range | 0.1% CH4 |
| Linear upper limit | 3% methane | Packaging Details | Palletized |
| Payment Terms | L/C, D/A, D/P, T/T, , | Overall power consumption | ≈ 750mW |
| Response time | T90 ≤ 2s | Life expectancy | ≥ 5 years |
| Supply Ability | 1500 | Delivery Time | 5-8 days |
| Model Number | VQ21TB | Brand Name | YJJ |
| Place of Origin | Britain | ||
| High Light | combustible gas sensor 0-100% LEL ，catalytic combustion gas sensor YJJ VQ21TB ，gas sensor for combustible gases | ||
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:
| Detecting gas | Combustible hydrocarbon gas |
| Range | 0 - 100% LEL |
| Methane explosion lower limit | 4.4% VOL |
| Power supply | Rated DC 3V |
| Peak | 50mA |
| Repeatability error | T90 ≤ 12s |
Company Details
Business Type:
Manufacturer,Trading Company
Year Established:
2006
Total Annual:
900000-1000000
Employee Number:
50~80
Ecer Certification：
Verified Supplier
Yijiajie Electronics is a full range of silicon pressure sensors from the United States, FREESCALE/, GE, MEAS, SMI, and a full range of sensing and control products from the United States pressure, temperature and humidity, gas flow, current, Hall effect, etc., Japan HAMAMATSU flame, UV sensors, ph... Yijiajie Electronics is a full range of silicon pressure sensors from the United States, FREESCALE/, GE, MEAS, SMI, and a full range of sensing and control products from the United States pressure, temperature and humidity, gas flow, current, Hall effect, etc., Japan HAMAMATSU flame, UV sensors, ph...
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