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Specifications
Operating Temperature:
-
Mfr. Part #:
VQ21B
Key Attributes
Model Number:
VQ21B
Product Description
Product Overview
The VQ21 is an improved, poison-resistant combustible gas detector element designed for the detection of combustible gases, particularly methane in air mixtures from 0.1% upwards. It offers no interference from water vapour or carbon dioxide and is suitable for use in atmospheres where traces of silicone and other poisoning agents may be present. When used with the recommended bridge circuit and mounting arrangement, it achieves a minimum sensitivity of 10 mV/% methane. The VQ21 is designed for continuous operation and can detect methane concentrations up to 5% with a fast response time.Product Attributes
- Brand: SGX Sensortech
- Model: VQ21
- Element Type: Combustible Gas Detector
- Detector Sleeve Color: Red
- Compensator Sleeve Color: Black
- Origin: Registered in England
- Issue: A1A-VQ21 Issue 4, March 2007
Technical Specifications
| Specification | Value | Notes |
|---|---|---|
| Operation | Continuous | May be under direct flow or diffusion conditions in appropriate mountings. |
| Bridge Supply | 2.0 + 0.1 V | |
| Bridge Power Consumption | 0.75 W max | |
| Typical Average Sensor Current | 300 mA | |
| Minimum Sensitivity | 10 mV/% methane | With open-circuit conditions at the bridge output. |
| Linearity | Linear up to 5% methane | |
| Response Time | 2 seconds | To register 1 1/4% in a 2 1/2% concentration. Function of mounting type. |
| Maximum Methane Concentration | 5 % | Calibration should be checked if exposed to >5% methane. |
| Mounting | See page 3 | |
| Outline | See page 3 | |
| Trimming Resistor (R) | Supplied where necessary | To be connected across the compensator element. |
| Resistance to Silicone Poisoning | Partly dependent on housing type | Results shown obtained using flow housing on page 3. |
| Response to Heavy Flammable Vapours | May be lower than calculated | Especially aromatic substances with side chains. |
Outline Dimensions (Nominal)
| Ref | Millimetres |
|---|---|
| A | 11.05 + 0.25 |
| B | 6.10 + 0.25 |
| C | 3.56 + 0.13 |
| D | 63.50 min |
| E | 1.02 |
| F | 7.37 + 0.51 |
| G | 8.20 max |
| H | 9.53 |
| J | 1.52 |
Recommended Mounting Arrangements
| Ref | Millimetres |
|---|---|
| AA | 19.05 max |
| AB | 9.53 + 0.13 |
| AC | 8.33 + 0.13 |
| AD | 8.20 min |
| AE | 19.05 max |
| AF | 9.53 + 0.13 |
| AG | 8.20 min |
2411261432_Amphenol-VQ21B_C3659317.pdf
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