High sensitivity methane sensor elements Amphenol VQ1B with matched pair and trimming resistor included
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.
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