Product Overview
The VQ1 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 reliable performance with no interference from water vapour or carbon dioxide. When used with the recommended bridge circuit and mounting arrangement, they provide a minimum sensitivity of 20 mV/% methane. The elements are suitable for continuous operation under direct flow or diffusion conditions and are robust, having passed shock tests of 250 g and vibration tests of 20 g. They are supplied as a matched pair with a trimming resistor for optimal performance.
Product Attributes
- Brand: SGX Sensortech(IS) Ltd
- Model Series: VQ1
- Product Type: Combustible Gas Detector Elements
- Element Identification: Serial number sleeve with standard colour code; detector bead with red sleeve and letter code; compensator bead with black sleeve.
- Sleeve Colour Code: Black (0), Brown (1), Red (2), Orange (3), Yellow (4), Green (5), Blue (6), Violet (7), Grey (8), White (9)
- Detector Bead Color: Dark
- Compensator Bead Color: White
- Origin: Registered in England No.08067077
- Certification/Standard Reference: A1A-VQ1 Issue 4, March 2007
- Protection Requirements: Must be protected from certain organic and silicone vapours by suitable filtering; caution advised near hot, oily machinery.
Technical Specifications
| Specification | Value | Notes |
|---|---|---|
| Operation | Continuous | May be under direct flow or diffusion conditions |
| Bridge Supply | 2.0 + 0.1 V | |
| Bridge Power Consumption | 0.75 W max | |
| Minimum Sensitivity | 20 mV/% methane | With open-circuit conditions at bridge output |
| Linearity | Linear up to 3% methane | |
| Response Time | 2 seconds | To register 1 1/4% in a 2 1/2% concentration; function of mounting type |
| Maximum Methane Concentration | 10 % | Calibration check recommended if exposed to >5% methane |
| Trimming Resistor (R) | 39 - 120 | Supplied with matched pair; connected across compensator element |
| Shock Test | 250 g, 5 blows in each plane | |
| Vibration Test | 20 g, 24 cycles from 100 to 3200 Hz | |
| Mounting | See page 2 | |
| Outline | See page 2 | |
| Filter Arrangement | 60 Mesh Stainless Steel Gauze, Filter Paper | Flow Rate: 500 cm/min |
Outline Dimensions (Nominal):
| Ref | Inches | Millimetres |
|---|---|---|
| A | 0.435 + 0.010 | 11.05 + 0.25 |
| B | 0.240 + 0.010 | 6.10 + 0.25 |
| C | 0.140 + 0.005 | 3.56 + 0.13 |
| D | 2.500 min | 63.5 min |
| E | 0.040 | 1.02 |
| F | 0.230 + 0.020 | 5.84 + 0.51 |
| G | 0.323 max | 8.20 max |
| H | 0.375 | 9.53 |
| J | 0.060 | 1.52 |
| AA | 0.750 max | 19.05 max |
| AB | 0.375 + 0.005 | 9.53 + 0.13 |
| AC | 0.328 + 0.005 | 8.33 + 0.13 |
| AD | 0.323 min | 8.20 min |
| AE | 0.750 max | 19.05 max |
| AF | 0.375 + 0.005 | 9.53 + 0.13 |
| AG | 0.323 min | 8.20 min |
Note: No bends may be made in lead length J. Millimetre dimensions derived from inches.
2411261432_Amphenol-VQ1B_C3659339.pdf
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