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Specifications
Mfr. Part #:
VQ21TSB
Key Attributes
Model Number:
VQ21TSB
Product Description
Product Overview
The SGX VQ21T Series Combustible Gas Sensor Elements are highly poison-resistant, low-voltage detectors designed for fixed systems. Utilizing the catalytic oxidation principle, these pellistors are ideal for general-purpose applications where power consumption is a consideration. They can detect a wide range of flammable gases and vapors, including methane in air mixtures from 0.1% to 5% (100% LEL). The VQ21T Series features significant improvements in pellistor bead structure, offering superior resistance to poisoning, particularly from silicones, and providing a considerably longer operational life compared to standard VQ1 pellistors.Product Attributes
- Brand: SGX Sensortech
- Series: VQ21T Series
- Principle: Catalytic Oxidation
- Poison Resistance: Highly poison resistant, particularly to silicones
- Power: Low voltage
- Application: Fixed systems, general purpose
- Detection: Most flammable gases and vapors, Methane (0.1% - 5% in air)
- Expected Operating Life: >5 years
Technical Specifications
| Specification | Value |
|---|---|
| Gases Detected | Flammable gases and vapors |
| Expected Operating Life | >5 years |
| Bridge Supply Voltage | 2.0 + 0.1 V |
| Sensor Current (typical) | 300 mA |
| Sensor Power Consumption (max) | 750 mW |
| Minimum Sensitivity (note 1) | 15 mV/% |
| Linearity | Linear up to 3% CH4 |
| Response Time (t50) (note 2) | 2 secs |
| Typical Max. Gas Concentration (note 3) | 100% LEL |
| Operational Temperature | -40C to +70C |
| Storage Temperature | +10C to +25C |
| Pressure | 1 Atm. +/-10% |
| Humidity | 0-80% RH (Non-condensing) |
| Orientation | Any |
| Shock Test (note 4) | 250 g, 5 blows in each plane |
| Vibration Test (note 4) | 20 g, 24 cycles, 100 to 3200 Hz |
| Models & Options | |
| VQ21TB (PCB Legs) | Included |
| VQ21TSB (PCB Legs, Hydrogen mods) | Included |
| Outline Dimensions (VQ21TB & VQ21TSB) | |
| A (max) | 11.3 mm (0.445 in) |
| A (min) | 10.8 mm (0.425 in) |
| B (max) | 6.35 mm (0.250 in) |
| B (min) | 5.85 mm (0.230 in) |
| C (max) | 3.69 mm (0.145 in) |
| C (min) | 3.43 mm (0.135 in) |
| D (min) | 40.0 mm (1.575 in) |
| E (nom) | 1.0 mm (0.039 in) |
| F (max) | 7.88 mm (0.310 in) |
| F (min) | 6.86 mm (0.270 in) |
| G (max) | 8.2 mm (0.323 in) |
| H (nom) | 1.5 mm (0.059 in) |
2410311911_Amphenol-VQ21TSB_C5997736.pdf
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