Combustible gas detection elements Amphenol VQ2B offering stable performance in methane air mixtures
Product Overview
The VQ2 Combustible Gas Detector Elements are designed for the detection of combustible gases, particularly methane in air mixtures, with concentrations starting from 0.1%. These matched elements offer low power consumption, making them ideal for battery-operated systems. They are unaffected by water vapour or carbon dioxide and provide a minimum sensitivity of 15 mV/% methane when used with the recommended bridge circuit. The VQ2 elements are suitable for operation under direct flow or diffusion conditions.
Product Attributes
- Brand: SGX Sensortech(IS) Ltd
- Product Type: Combustible Gas Detector Elements
- Model Series: VQ2
- Marking: Serial number in red on detector, black on compensator. Red circular label on detector base.
- Origin: Registered in England
- Note: Elements are supplied as a matched pair with a trimming resistor (68-220 ) to be connected across the compensator.
Technical Specifications
| Specification | Value | Notes |
|---|---|---|
| Operation | Continuous | 1 |
| Bridge Supply | 2.0 + 0.1 V | |
| Bridge Power Consumption (at 2.0 V) | 0.48 W max | |
| Minimum Sensitivity | 15 mV/% methane | 2 |
| Linearity | Linear up to 3% methane | |
| Response Time (to register 1 1/4% in a 2 1/2% concentration) | 2 seconds | 2, 3 |
| Maximum Methane Concentration | 5 % | 4 |
| Ambient Temperature Range | -75 to +40 C | 7 |
| Bridge Zero Change (within temp. range) | 1.5 mV max | 7 |
| Shock Test | 250 g, 5 blows in each plane | |
| Vibration Test | 20 g, 24 cycles from 100 to 3200 Hz | |
| Outline Dimension A | 11.05 + 0.25 mm | |
| Outline Dimension B | 6.10 + 0.25 mm | |
| Outline Dimension C | 3.56 + 0.13 mm | |
| Outline Dimension D | 63.5 min mm | |
| Outline Dimension E | 1.02 mm | |
| Outline Dimension F | 7.37 + 0.51 mm | |
| Outline Dimension G | 8.20 max mm | |
| Outline Dimension H | 9.53 mm | |
| Outline Dimension J | 1.52 mm | No bends may be made in this length. |
| Mounting Arrangement AA | 19.05 max mm | |
| Mounting Arrangement AB | 9.53 + 0.13 mm | |
| Mounting Arrangement AC | 8.33 + 0.13 mm | |
| Mounting Arrangement AD | 8.20 min mm | |
| Mounting Arrangement AE | 19.05 max mm | |
| Mounting Arrangement AF | 9.53 + 0.13 mm | |
| Mounting Arrangement AG | 8.20 min mm |
Notes:
1. Operation may be under either direct flow or diffusion conditions in appropriate mountings.
2. With open-circuit conditions at the bridge output.
3. The response time is a function of the type of mounting used.
4. If the VQ2 is exposed to greater than 5% methane concentration, the calibration of the instrument should be checked.
6. The elements must be protected from certain organic and silicone vapours by suitable filtering, and caution should be exercised when operating in close proximity to hot, oily machinery.
7. The bridge zero shall not change by more than 1.5 mV for this temperature range.
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